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6 Best Practices to Design Javascript Coding Challenges with APIs

6 Best Practices to Design Javascript Coding Challenges with APIs

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January 25, 2023
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3 min read
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Key Takeaways:

  • Clearly define the challenge's objective, such as hiring, raising awareness, or testing your product, to guide challenge design and participant expectations.
  • Choose a suitable programming language based on popularity, company requirements, or your team's familiarity with it to enhance participation and relevance.
  • Define challenges with varying difficulty levels to progressively test developers, ensuring that they align with the APIs and the goals of the challenge.
  • Ensure API stability and pre-install SDKs for participants to focus on coding, not setup, and offer detailed documentation to aid smooth API integration.
  • Use real-world problems and implement unit tests to validate API usage, ensuring that the solutions demonstrate the candidate's true skills and creativity.
  • Before we begin, let me share a bit about our journey.

    At Amadeus for Developers, we offer travel data and services to developers across the world through REST APIs. Thanks to HackerEarth’s platform, we recently hosted the Hack the Journey/Coding India Edition DevOps coding challenge and we invited all developers from India to participate. Since India is one of our main markets, our goal was to allow developers to explore our travel APIs and challenge their knowledge of travel solutions. We designed both theoretical and backend coding challenges, but in this article, we will focus only on the coding part.

    The coding challenges were a combination of algorithmic problems and travel technologies. We asked developers to use data from the Amadeus for Developers REST APIs and our SDKs to solve them.

    In this article, we will share with you the best practices to build successful Javascript coding challenges with APIs, based on our experience hosting such challenges for global developers.

    Use these 6 best practices to design Javascript coding challenges

    Let’s explore the 6 best practices that you need for designing Javascript coding challenges for developers:

    Steps to Design Javascript Coding Challenges

    #1—Define your objective

    An essential first step is to define your objectives. When you have that clear in mind, you can build challenges to meet your goals. Some common objectives could be:

    • Hiring: many companies use coding challenges as part of the recruitment process to identify and evaluate the technical skills of potential candidates.
    • Awareness: companies build coding challenges to bring awareness to the developer community about their product.
    • Testing your product: Javascript coding challenges are a great way to allow developers to play with your product. That can bring you valuable feedback and future ideas to improve your product roadmap.

    #2—Choose the programming language

    One of the key decisions you have to make when you build Javascript coding challenges: which programming language the participants will be required to use. There are several factors to take into consideration in order to identify the most fitting ones:

    • Top languages: by choosing one of the top languages in the market such as Python, JavaScript, etc. you will attract a larger number of participants.
    • Company-used languages: if your goal is hiring, you might want to evaluate the participants’ coding skills in  your company’s programming languages
    • Your familiarity with the language: make sure you are familiar with the language you offer the challenge. That will help you build challenges that fit the language and also better understand the submitted solutions.

    For example, in our case, we designed both a Python and Node coding challenge since these are languages we use on a daily basis, but are also the top-used languages for our SDKs. Developers were able to choose to participate in one of these.

    Also read: Top 10 Programming Languages of the Future

    #3—Define the challenge

    The challenge definition is one of the most crucial steps when it comes to the event’s success. Below are some points to consider:

    • Difficulty level: By providing developers with some warm-up tasks and later on more challenging ones, you give them the opportunity to understand your APIs gradually. Make sure you find the right balance. To ensure the Javascript coding challenges are at the level you are thinking of, it could be useful to ask a colleague to solve them. This will give you an idea of how much time and effort is required to complete the tasks, and allow you to adjust the difficulty accordingly.
    • Static data: Define challenges that the APIs always return the same data. This will help you to evaluate the solution’s correctness with the unit tests. Since that’s not easy to guarantee, you can build some sandbox environments with static data and coordinate with your API development teams to ensure that the data is not refreshed during the event.

    #4—Maximize the efficiency of SDKs

    If you provide SDKs as part of your API, you want developers to focus on the challenge solution and use your SDK efficiently, so we would suggest the followings:

    • Set up the environment: pre-install the SDKs so developers won’t spend time and effort preparing the environment.
    • Make docs accessible: to make it easy for developers to make their first API call, consider giving them the necessary resources during the challenge.

    #5—Ensure API stability

    Ensuring the stability of your APIs is essential to let developers solve the given challenges. Here are some points to consider:

    • Check API stability: If there are any known to you instabilities (eg. backend refresh on specific days) try to avoid the event on these days. If this is not possible, inform the participants about these times to avoid potential disruptions.
    • Rate limits: don’t forget to consider the API rate limits when you design the Javascript coding challenges. Provide the participants with the necessary documentation or even some helper functions to help them focus on the challenge solution.

    Even if instability affects some solutions, it’s not the end of the world. If the developers have hardcoded their solution, make sure you verify their algorithm and any comments they might have left to prove that they were going to arrive at the correct answers despite the instability.

    #6—Conduct unit tests

    The unit tests are critical to evaluate the submissions and help you find the winners. Some best practices for the unit tests are:

    • Validate API usage: in order to validate that developers indeed used your API to solve the challenge, write some unit tests to identify the usage of an API key. Also in the file that developers are going to write the code, you can pre-define some variables that are expected to add the API key and secret.
    • Hide unit test files: this will ensure that developers won’t be able to know what are the expected solutions. Just a tip, it is possible for participants to get through the logs of the unit tests, and in that case, make sure you encrypt them.

    Comprehensive list of JavaScript coding challenges

    Delving deep into JavaScript requires a mix of theoretical knowledge and hands-on coding practice. Below are various coding challenges, organized by difficulty level and specific concepts, designed to test and improve your JavaScript prowess.

    1. Beginner challenges

    • Basic arithmetic operations:
      • Challenge: Create a JavaScript function that takes two numbers as arguments and returns their sum, difference, product, and quotient
      • Concept: Basic functions and arithmetic operationsString reversal:
    • String reversal:
      • Challenge: Write a JavaScript function that reverses a string
      • Concept: String manipulation
    • Array duplication:
    • Challenge: Create a function that removes duplicates from an array
    • Concept: Array manipulation and iteration

    2. Intermediate challenges

    • Palindrome check:
    • Challenge: Determine if a given string is a palindrome (reads the same backward as forward, ignoring spaces, punctuation, and capitalization).
    • Concept: String manipulation and conditional logic
    • Fibonacci series:
      • Challenge: Write a function that generates the first ‘n’ numbers in the Fibonacci series
      • Concept: Recursion and iterative solutions
    • Find the missing number:
      • Challenge: Given an array containing n distinct numbers taken from 0, 1, 2, …, n, find the one that is missing from the array
      • Concept: Mathematical operations and array manipulation

    3. Advanced challenges

    • Flatten nested array:
      • Challenge: Implement a function that flattens a nested array
      • Concept: Recursion and array manipulation
    • Implement bind():
      • Challenge: Replicate the functionality of the bind() function without using the built-in function
      • Concept: Advanced functions and the ‘this’ keyword
    • Deep equality check:
      • Challenge: Write a function that checks if two objects (and their nested objects) are deeply equal
      • Concept: Recursion, object manipulation, and deep comparison

    4. Concept-specific challenges

    • Promises:
      • Challenge: Create a mock API call using JavaScript’s Promise
      • Concept: Asynchronous programming and Promises
    • Closures:
      • Challenge: Design a function that generates a series of functions to add n to their argument, where n is the order in which they were generated
      • Concept: Closures and function factories
    • DOM Manipulation:
      • Challenge: Build a simple JavaScript-based to-do list with add, delete, and mark as completed functionalities
      • Concept: DOM manipulation and event handling

    Additional tips for solving JavaScript coding challenges

    While the right logic and approach are essential for solving coding challenges, there are several other aspects that can enhance your problem-solving journey, especially when using JavaScript. Here are some additional pointers:

    • Before jumping into the code, make sure you understand the problem thoroughly. It might help to write down or discuss the problem with someone else or even talk aloud to yourself. Often, solutions emerge from a deeper understanding.
    • If a problem seems too complex, break it down into smaller components or steps. This modular approach can make the overall challenge more manageable and can aid in systematic problem solving.
    • JavaScript has a plethora of built-in methods, especially for arrays and strings. Familiarize yourself with these, but also know when they might be overkill. Sometimes a simpler approach might be more efficient and more readable.
    • When solving a challenge, think about potential edge cases. For example, consider empty strings, arrays, or the minimum and maximum possible inputs.
    • Use console.log() extensively to understand the flow of your code and to pinpoint issues. Developer tools in browsers can also provide insights into the execution of your JavaScript code.
    • Your first solution doesn’t always have to be the most efficient. It’s okay to arrive at a working solution first and then iterate on it to make it better.
    • Like any skill, coding gets better with regular practice. Regularly engage with coding platforms, participate in coding challenges, and always strive to learn from your mistakes.
    • JavaScript, like all languages, evolves. Stay updated with the latest ECMAScript specifications and new methods or features that might be introduced.
    • Join coding forums or communities where you can post your solutions and receive feedback. Sometimes, there are multiple ways to solve a problem, and seeing others’ solutions can provide new perspectives.
    • Frustration can be a natural part of the problem-solving process. If you’re stuck, take a break. Sometimes, stepping away and coming back with a fresh mind can make all the difference.

    Also read: How to Create a Great Take-Home Coding Test?

    Create Javascript coding challenges with HackerEarth

    To sum up, it’s crucial to carefully consider several factors when creating challenges that require developers to use APIs to reach the problem solution. By following best practices such as ensuring API stability, building the right unit tests, and providing necessary resources, you can create successful Javascript coding challenges that allow developers to explore and test their knowledge of your APIs. Lastly, don’t hesitate to ask HackerEarth for support and advice. Thanks to them, we were able to solve many of our doubts and build a successful coding challenge together.

    We hope that these tips will be useful for your own journey.

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    What It Takes to Keep Gen Z Engaged and Growing at Work

    What It Takes to Keep Gen Z Engaged and Growing at Work

    Engaging Gen Z employees is no longer an HR checkbox. It's a competitive advantage.

    Companies that get this right aren’t just filling roles. They’re building future-ready teams, deepening loyalty, and winning the talent market before competitors even realize they’re losing it.

    Why Gen Z is Rewriting the Rules

    Gen Z didn’t just enter the workforce. They arrived with a different operating system.

    • They’ve grown up with instant access, real-time feedback, and limitless choice. When work feels slow, rigid, or disconnected, they don’t wait it out. They move on. Retention becomes a live problem, not a future one.
    • They expect technology to be intuitive and fast, communication to be direct and low-friction, and their employer to reflect values in daily action, not just annual reports.

    The consequence: Outdated systems and poor employee experiences don’t just frustrate Gen Z. They accelerate attrition.

    Millennials vs Gen Z: Similar Generation, Different Expectations

    These two cohorts are often grouped together. They shouldn’t be.

    The distinction matters because solutions designed for Millennials often fall flat for Gen Z. Understanding who you’re designing for is where effective engagement strategy begins.

    Gen Z’s Relationship with Loyalty

    Loyalty, for Gen Z, is earned, not assumed.

    • They challenge outdated processes and push for tech-enabled workflows.
    • They constantly evaluate whether their current role offers the growth, flexibility, and purpose they need. If it doesn’t, they start looking elsewhere.

    Key insight: This isn’t disloyalty. It’s clarity about what they want. Organizations that align experiences with these expectations gain a competitive edge.

    • High turnover is the cost of ignoring this.
    • Stronger teams are the reward for getting it right.

    What Actually Works

    1. Rethink Workplace Technology

    • Outdated tools may be invisible to older employees, but Gen Z sees them immediately.
    • Modern HR tech and collaboration platforms improve efficiency and signal investment in people.
    • Invest in tools that reduce friction and enhance daily experience, not just track performance.

    2. Flexibility with Clear Accountability

    • Gen Z values autonomy, but also needs clarity to thrive.
    • Hybrid and remote models work when paired with well-defined goals and explicit ownership.
    • Focus on outcomes, not hours. Autonomy with accountability is a combination Gen Z respects.

    3. Continuous Feedback, Not Annual Reviews

    • Annual performance reviews feel outdated. Gen Z expects real-time feedback loops.
    • Frequent, actionable feedback helps employees improve faster and signals that their growth matters.
    • Make feedback a weekly habit, not a twice-yearly event.

    4. Make Growth Visible

    • If career paths aren’t clear, Gen Z won’t wait. They’ll look elsewhere.
    • Internal mobility, structured learning paths, and reskilling opportunities signal future potential.
    • Invest in learning and development and make career trajectories explicit.

    5. Build Real Belonging

    • Inclusion must show up in daily interactions, not just company values documents.
    • Inclusive environments where diverse perspectives are genuinely sought produce better decisions and stronger engagement.
    • Gen Z quickly notices when DEI is performative. Build it into everyday interactions.

    6. Connect Work to Purpose

    • Gen Z wants to see how their work matters in a direct, traceable way.
    • Linking individual roles to tangible business outcomes increases ownership and engagement.
    • Purpose-driven work isn’t a perk. It’s a retention strategy.

    7. Prioritize Well-Being

    • Burnout is a performance problem before it becomes attrition.
    • Mental health support, sustainable workloads, and genuine flexibility reduce stress and sustain engagement.
    • Policies must be real in practice. Gaps erode trust.

    How to Attract Gen Z from the Start

    Job Descriptions That Tell the Truth

    • Generic postings don’t convert Gen Z candidates. They want specifics: remote or hybrid expectations, real growth opportunities, and culture in practice.
    • Transparent job descriptions attract better-fit candidates and reduce early attrition.

    Skills Over Experience

    • Gen Z and organizations hiring them increasingly value potential over tenure.
    • Skills-based hiring opens access to a broader, more diverse talent pool and builds teams equipped for change.
    • Hire for capability and future-readiness, not just years on a resume.

    The Bottom Line

    Retaining Gen Z isn’t about perks. It’s about rethinking the employee experience from the ground up.

    • Flexibility without accountability fails.
    • Purpose without visibility is hollow.
    • Growth that isn’t visible or structured drives attrition faster than most organizations realize.

    The payoff: When organizations combine the right technology, real flexibility, continuous feedback, visible growth paths, and genuine inclusion:

    • Gen Z doesn’t just stay. They perform at a higher level.
    • Adaptive, future-forward thinking compounds over time.

    That’s what separates organizations that thrive in today’s talent market from those constantly replacing people who left for somewhere better.

    AI Tools for HR Managers in 2026: What's Actually Working (And What Isn't)

    AI Tools for HR Managers in 2026: What's Actually Working (And What Isn't)

    The current state of AI adoption in HR
    88% of HR leaders say their organizations have not yet realized significant business value from AI. That number is striking, given that 91% of CHROs now rank AI as their single top priority. The gap is not a technology problem it is an adoption and strategy problem. Most HR teams have added AI to their workflows in some form, but very few have moved past experimentation into real, measurable impact.

    This guide is for HR managers who want to change that. Not a list of tools to bookmark and forget, but a clear-eyed look at where AI is delivering results in 2026, what separates the tools that work from the ones that don't, and how to actually use them.

    The adoption gap that most HR leaders aren't talking about

    AI is present but underutilized.
    According to the SHRM State of AI in HR 2026 report, 62% of organizations use AI somewhere in their business. But only 11% have embedded AI into daily workflows, defined as more than 60% of employees using it daily. That is a significant divide and explains why so many AI investments feel underwhelming.

    Managers experiment more than employees.
    A July 2025 Gartner survey of 2,986 employees found that 46% of managers are experimenting with AI, compared to just 26% of employees. Most organizations encourage exploration but fail to provide the structure, expectations, or training needed to make AI stick. Only 7% of organizations give employees guidance on how to use the time AI saves them.

    The result: wasted potential.
    Workforces have access to powerful tools but no framework for using them strategically. AI becomes another tab open in the browser, rather than a fundamental shift in how work gets done.

    The opportunity is real.
    Organizations that have moved from experimentation to integration are seeing tangible outcomes:

    • AI-powered recruitment tools reduce time-to-hire by an average of 30 days.
    • AI automates up to 60% of routine HR tasks, saving employees five or more hours per week.
    • Predictive analytics reduces voluntary turnover by 22–28% in the first year of deployment.

    Capturing this opportunity requires the right tools and the right strategy.

    Why 2026 is different from every other year of "AI in HR"

    1. Skills-based hiring has gone mainstream.
    Josh Bersin's 2026 Talent Report found that 72% of companies are moving away from degree requirements in favor of skills-based evaluation. Gartner reports that 65% of enterprises are actively prioritizing it. The traditional resume is no longer the most reliable signal of candidate quality, especially in tech roles where the half-life of skills is just two years.

    2. Agentic AI has arrived.
    Earlier generations of HR AI could automate tasks or analyze data. Agentic AI can plan, act, and iterate across entire workflows without constant human direction. 48% of large companies have already adopted agentic AI in HR, with projections showing 327% growth by 2027. This is no longer experimental.

    3. Regulatory pressure is real.
    The EU AI Act now classifies hiring AI as high-risk, making transparency and audit trails a legal requirement. Any AI tool influencing hiring decisions must be explainable. Black-box systems are a compliance liability.

    What separates genuinely useful HR AI tools from the rest

    They augment judgment rather than replace it.
    Great HR AI tools make professionals better at their jobs. They surface the right information at the right moment, flag unnoticed patterns, and reduce cognitive load. Tools that try to remove humans entirely create legal risk and distrust. 88% of HR leaders haven’t seen ROI largely because their tools automate the wrong things.

    They generate actionable insight, not just output.
    Predictive models identify at-risk employees six months before they leave, skills-gap analyses shape hiring plans before a role opens, and candidate matching highlights transferable potential. This is the difference between AI that saves time and AI that changes decisions.

    They are transparent and explainable.
    Employees trust AI-generated reviews twice as often when they understand the criteria. 67% of candidates accept AI screening as long as a human makes the final call and the process is explained. Transparency builds trust, drives adoption, and ensures compliance.

    Top AI tools for HR managers in 2026

    HireVue
    Standard for AI-powered video interviews and structured candidate assessments at scale. Cuts time-to-hire by 50%, supports 40+ languages, and uses IO psychologist-vetted guides. Bias audits and deterministic algorithms ensure fairness. Ideal for regulated industries and high-volume hiring.

    Eightfold AI
    Built for skills-first talent strategy. Maps 1.6 billion career profiles to a skills graph, matching candidates on potential rather than keywords. Increases recruiter productivity by 50%+ and reduces diversity sourcing time by 85%. Best for large enterprises focused on internal mobility and workforce planning.

    Workday
    Comprehensive HR platform with agentic AI for workforce planning, analytics, and employee lifecycle management. Acquisition of HiredScore integrates AI recruiting orchestration. Suitable for organizations needing a single system for headcount planning to performance reviews.

    Lattice
    Focuses on employee performance and engagement. AI identifies growth patterns, surfaces feedback trends, and flags disengagement early. Predictive models detect at-risk employees six months in advance, enabling targeted retention strategies. Ideal for culture and retention-focused organizations.

    HackerEarth
    Covers full tech hiring lifecycle, from sourcing developers through hackathons to live technical interviews. OnScreen AI interview agent uses lifelike avatars for structured, bias-free interviews. Ensures verification and cheat-proof processes. Trusted by Google, Amazon, Microsoft, Barclays, and Walmart.

    Moving from experimentation to impact: a practical framework

    1. Start with one high-friction problem.
    Automate workflows that cost the most time or cause the most inconsistency typically initial candidate screening. Measure outcomes to justify next investments.

    2. Define success before deployment.
    47% of CHROs haven’t established clear AI productivity metrics. Set baseline and target improvements: time-to-shortlist, quality-of-hire, recruiter hours per hire anything trackable.

    3. Put managers in the loop.
    AI adoption gaps are often a manager problem. Give managers specific use cases, integrate AI into workflows, and provide language to discuss it with their teams.

    The bottom line

    AI will not change HR’s fundamental nature it remains a people function requiring judgment, empathy, and context. What AI improves is:

    • The quality of information available for every decision.
    • The time HR teams spend on work that doesn’t require judgment.

    Organizations getting ahead in 2026 are those that select the right tools for the right problems and give teams structure to use them effectively. That is where the real advantage lies.

    How to Handle Conflict at Work

    How to Handle Conflict at Work

    HR leaders often hear the same concern: "Small issues are turning into big problems, and teams are getting harder to manage."

    They’re right. Conflict isn’t new, but how it appears today is different. Teams move faster, deadlines are tighter, and the pressure to deliver is constant. Friction builds quickly, and what used to stay small now escalates before anyone notices.

    Here’s what most teams miss: the same conflict slowing them down can also be the thing that makes them stronger.

    How Small Issues Turn Into Big Problems

    You’ve probably seen this pattern before.

    It starts with a misunderstanding, a missed expectation, or a poorly communicated decision. Nothing major, just enough tension to create distance.

    That tension rarely gets addressed. Instead, it turns into silence. People stop raising concerns, avoid difficult conversations, and begin working around each other instead of with each other.

    Over time, silence becomes disengagement. Collaboration drops. Trust weakens. Performance slips, and there’s no single moment you can point to as the cause. You’re left wondering, "What actually went wrong here?"

    The shift that changes everything: the best teams don’t avoid conflict. They address it early. Honest communication and neutral guidance turn potential problems into opportunities to strengthen teams.

    Conflict Is More Predictable Than It Feels

    Most workplace conflict comes from a few common triggers:

    • Miscommunication or lack of clarity
    • Unclear roles and ownership gaps
    • Differences in work styles or expectations
    • Pressure from deadlines and performance targets

    Recognizing these patterns early makes conflict easier to manage and often preventable.

    Step 1: Make It Easy to Speak Up Early

    The biggest reason conflict escalates is silence.

    People notice issues early but hesitate to raise them. Maybe they don’t feel safe. Maybe they think it’s not worth it. By the time it surfaces, it always is.

    The fix is straightforward:

    • Create regular space for honest conversations
    • Normalize feedback outside formal reviews
    • Train managers to handle uncomfortable discussions confidently

    When people speak early, problems stay small and solvable.

    Step 2: Act Early It Only Gets Harder

    Many teams wait, hoping issues will resolve themselves. Conflict doesn’t disappear.

    Small issues become frustration. Frustration becomes disengagement. Disengagement becomes attrition.

    The best HR teams act early, even when conversations aren’t perfect. Early action is always easier than late correction.

    Step 3: Managers Decide How Most Conflicts End

    Strong HR processes matter, but most conflicts begin with managers.

    Many managers aren’t equipped to handle conflict well. They avoid it, rush it, or escalate too quickly.

    What works:

    • Listen before reacting. Understand what’s happening before seeking a resolution.
    • Stay neutral under pressure. Avoid taking sides prematurely.
    • Give clear, specific feedback. Vague conversations leave both sides confused.

    When managers get this right, most conflicts resolve before HR intervention is needed.

    Step 4: Focus on What Happened, Not Who Someone Is

    It’s easy to say, "They’re difficult to work with."

    It’s more effective to say, "Here’s what happened and the impact it had."

    This shift:

    • Reduces defensiveness
    • Keeps conversations objective
    • Leads to faster, more durable outcomes

    People can change behaviors. They resist being labeled.

    Step 5: Give People a Process They Can Trust

    Uncertainty worsens conflict.

    Employees ask: Who do I go to? What happens next? Will this be handled fairly?

    If answers aren’t clear, people stay silent or escalate too late. A simple, transparent process builds confidence and encourages early action.

    How to implement:

    • Document it
    • Communicate it
    • Ensure managers know it as well as HR

    Where Things Usually Go Wrong

    Even strong HR teams fall into common traps:

    • Ignoring early warning signs — hoping small issues resolve themselves
    • Taking sides too quickly — before understanding the full picture
    • Relying on policy over people — process matters, but relationships matter more
    • Focusing on blame instead of outcomes — conflict resolution isn’t about who’s right

    The goal isn’t to assign fault. It’s to decide what works next.

    The Bottom Line

    Conflict isn’t going away. How you handle it is a choice.

    Handled poorly: drains teams and erodes culture.
    Handled well: builds trust, sharpens communication, and strengthens performance faster than most team-building initiatives.

    The best workplaces aren’t conflict-free.
    They are just better at navigating it than everyone else.

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