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Tackling large user traffic with Ajay Sampat, Sr. Engineering Manager, Lyft

Tackling large user traffic with Ajay Sampat, Sr. Engineering Manager, Lyft

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Arbaz Nadeem
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April 6, 2020
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3 min read
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In our first episode of Breaking 404, a podcast bringing to you stories and unconventional wisdom from engineering leaders of top global organizations around the globe, we caught up with Ajay Sampat, Sr. Engineering Manager, Lyft to understand the challenges that engineering teams across domains face while tackling large user traffic. Through this episode, Ajay shares his personal experiences and hardships that developers/engineers face in their day-to-day tasks.

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Arbaz: Hello everyone and welcome to the first episode of Breaking 404 by HackerEarth, a podcast for all engineering enthusiasts, professionals and leaders to learn from top influencers in the engineering and technology industry. This is your host Arbaz and today I have with me Ajay Sampat, Sr. Engineering Manager at Lyft, a ridesharing company based in San Francisco, California.

Ajay: It’s great to be here and share my journey with the global HackerEarth community.

Arbaz: So let’s get started with a little bit about yourself? How has your professional journey been?

Ajay:

  • I moved from Mumbai, India to the United States when I was 18.
  • I graduated with bachelor's & master's degrees in computer science & engineering from Ohio State & Santa Clara University respectively where I had a deep interest in how computers interacted with each other at lightning speed across the globe over the internet.
  • I started my career working on block storage and supercomputers at HITACHI.
  • I learned a lot from the Japanese work culture about focus, dedication, and quality.

KIXEYE

  • I knew I wanted to work on a consumer-focused product and hence took a leap of faith in online and mobile games with KIXEYE.
  • I learned about growth culture and tactics from KIXEYE - building out a full stack team that focused on Growth Funnel of Acquisition, Activation, Retention, Revenue, and Referrals.

TEXTNOW

  • I took those learnings to the telecommunication vertical with TextNow building out the Business Intelligence and growth teams building products on user segmentation and insights, attribution, lifetime value prediction, experimentation, user engagement.

LYFT

  • Currently, I head the Marketing Automation team at Lyft focusing on the top part of the funnel for strategic investments across paid and owned channels to scale both drivers and riders in a two-way marketplace.

Throughout my professional journey, I have had moments of introspection and self-discovery. I have asked myself:

  • What do I really enjoy? Product Management or People Management?
  • Do I want to work for a small, midsize or large company?
  • What culture and values do I want the company to embody?
  • What skills do I want to develop?
  • What personal brand do I want to create?

Arbaz: One thing that all engineers would be inquisitive to know is, what is the biggest fear that you have, being the Sr. Engineering Manager at Lyft?

Ajay: This is not specific to Lyft but my biggest fear is not being able to create a highly functional team that delivers impact on the business. There are a lot of sub-dimensions to this but the key point I would like to highlight is the ability to hire and retain top talent in the competitive bay area market.

Arbaz: The burning question that everyone would love to know from someone working in the Lyft engineering team is: how does Lyft bring up a robust and scalable platform for managing high user traffic at certain times of the day?

Ajay: This is a culmination of years of hard work and learning from hundreds of engineers at Lyft encompassing Infrastructure, Developer productivity, and platform teams. I am fortunate to work with amazingly bright people who are passionate about their craft and the problems they are solving every day. Lyft shares a lot of in-depth articles regarding our technical challenges and our approach to solving those problems in our engineering blog - eng.lyft.com. I would also like to mention that Lyft is a major contributor to the open-source community. You can find our latest and greatest advancements in networking, security, data management at lyft.github.io.

Arbaz: That’s great to know. On the personal side, what is your favorite leisure-time activity that you love to do when not working?

Ajay: Spending quality time with my son - reading him stories, taking him to the park with our dog, working on puzzles and experiencing nature during our camping trip. “This is the greatest joy of my family's life.”

Arbaz: That’s really wonderful. Back to Ajay, the professional, one thing that all tech companies globally are looking for is to minimize technical debt. So, how do you maintain a balance of technical stability (minimize technical debt) while still delivering high-quality code?

Ajay: We like to use this question in our manager interviews. I think this depends a lot on the maturity and criticality of the feature. E.g: Tier 0 core rides API should not be held to the same quality standard of a tier 2 funnel conversion feature. In the early stages of a new feature, it is important to experiment a lot in beta, with small rollouts to gather customer feedback. This might lead to some interim shortcuts and tech debt but once it's decided that an experiment is going to be turned into a long-lasting feature it is important to scope it holistically with test coverage, edge cases, scaling, fallback plan and so on. When it comes to mid to long term planning - it is important to view all workstreams with the same lens - engineering effort vs business impact. This requires that one is accurately able to quantify the impact of working on tech debt or the addition of a new feature and help the business make the appropriate tradeoff.

Arbaz: With all the innovation and new technologies coming up, how do you see the technical landscape changing over the next few years and how will you prepare engineering for that?

Ajay: Jensen Huang, Nvidia CEO once said: “Software Is Eating the World, but AI Is Going to Eat Software”. It is getting increasingly clear that we are moving from a Mobile-first to an AI-first world. It’s all around us from the intelligent vacuum cleaners at home to the smart cars we drive.

Two main areas that intrigue me:

  • The first is AI plug-ins & IDEs like Kite and PyCharm which are making coding easier and more accessible. They are significantly reducing the barrier to entry to coding and now almost anyone with basic training can build web and mobile apps.
  • The second is AutoML which is democratizing Machine Learning and providing ML as a service. With advancements in ML libraries like sklearn, tensorflow, xgboost, and tools like DataRobot and H2O.ai, major resource-intensive activities like feature engineering, model selection, training, and tuning are being automated, leading to faster and higher accuracy models.

These technologies will continue to make great strides in the years to come.

Arbaz: Now, taking you a few years back and trying to get the fresh graduate developer out of you here. From a candidate’s point of view, what do you think is the most challenging part of any technical job assessment or interview?

Ajay: My belief is - that for most people it is Anxiety. Let's take a coding interview, for example. Obviously, you need some basic technical knowledge of data structures, algorithms, and problem-solving to do well in a coding interview which I feel most software engineers do. Where most people suffer is they let self-doubt or anxiety get the best of them. I feel if people stay calm and focused during a technical assessment, they will be able to hear the question properly, recollect their learnings, ask the interviewer the right questions and perform their best!

Arbaz: Very well said! Taking you further back in time, what was the first programming language you started to code in?

Ajay: I got my first computer which was a Pentium III in 1999, over 20 years ago. The first programming language I coded in was HTML which was self-taught so I could build a website and have my presence known on the Internet.

Arbaz: What would be your 1 tip for all Developers, Engineering Managers, VPs and Directors for being the best at what they do?

Ajay: Albert Einstein said, “Once you stop learning, you start dying”. The technology landscape is constantly evolving. This makes it very important for everyone to stay up to date with the latest trends that interest them so they can continue to sharpen their skills. That could be the latest front end coding language, cloud service or growth tactic. Luckily, this is much easier now with the plethora of knowledge consumption mediums like blogs, e-magazines, videos & podcasts.

Arbaz: Engineers and Hiring Managers are usually thought of as really serious people who are engrossed in their work and not very social. Although we see most developers plugged in with their headphones and listening to songs. What songs or music genre best describes your work ethic?

Ajay: It has to be deep house with its high momentum and tempos. And like real work and life it has buildups and drops.

Arbaz: Lastly, If not engineering, what alternate profession would you have seen yourself excel in?

Ajay: I can see myself being in stock or commodity trading which runs in the family. Our family business has been an integral part of my childhood and has had a lasting impression on me. It has taught me the value of honesty and hard work. Trading requires constant researching, building long term strategies and relationships which I enjoy a lot.

Arbaz: It was a pleasure having you as a part of today’s episode. It was really informative and insightful to hear from you.

Ajay: Thank you for having me Arbaz and HackerEarth.

Arbaz: This brings us to the end of today’s episode. Stay tuned for more such enlightening episodes. This is Arbaz, your host signing off until next time.

About Ajay Sampat:

Ajay Sampat is a seasoned growth engineering professional with expertise in scaling companies with state-of-the-art growth technology stacks. Ajay currently heads the Marketing Automation team at Lyft. Prior to Lyft, he started the SF office for Canadian startup TextNow and led its Business Intelligence & Growth teams, making it a top 30 Android app and top 100 iOS App, tripling their DAU and revenue. Before TextNow, he spent three years at KIXEYE building out the Growth engineering organization managing multiple successful desktop and mobile game launches. Ajay started his career at Hitachi working on block storage and supercomputers. Ajay has a BS in Computer Science from The Ohio State University and an MS in Computer Engineering from Santa Clara University.

Links:

Twitter: @asampat

LinkedIn: https://www.linkedin.com/in/ajaysampat/

Website: www.ajay.digital

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April 6, 2020
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3 min read
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Why AI Interviews Are Becoming Standard Practice in Technical Hiring

Why AI Interviews Are Becoming Standard Practice in Technical Hiring

What Engineering Leaders and Talent Teams Need to Know in 2026

Technical hiring has a throughput problem. The average senior engineer spends over 15 hours a week on candidate screening, time pulled directly from product work. Recruiters manage inconsistent evaluation standards across interviewers, scheduling bottlenecks across time zones, and drop-off rates that increase every time a candidate waits too long to hear back.

AI-powered interviews have emerged as a direct response to these operational challenges, and in 2026, they have moved from experimental to mainstream.

This is not about replacing human judgment in hiring. It is about how AI interviews fit into a well-designed technical hiring process, what research shows about their impact, and what to consider when evaluating platforms.

AI Interviews Remove the Limits of Human Screening

The most immediate value of AI-powered interviews is capacity. A single AI interviewer can screen thousands of candidates simultaneously, across time zones, without scheduling conflicts, and with consistent evaluation standards. For organizations running high-volume technical hiring or expanding globally, this eliminates the constraints imposed by human bandwidth.

Consistency is another key advantage. Human screening can vary across interviewers, days, and even times of day. AI interviews apply the same rubric to every candidate, every time. This ensures fairness and produces higher-quality data for hiring decisions downstream.

Cost savings are also significant. Automating repetitive screening through AI can reduce recruitment costs by up to 30 percent, freeing senior engineering and recruitment teams to focus on areas where human judgment adds the most value, such as final technical rounds, culture fit, and candidate closing.

What the Data Actually Tells Us

A large-scale study by Chicago Booth's Center for Applied Artificial Intelligence screened over 70,000 applicants using AI-led interviews. The results challenge the assumption that automation compromises hiring quality.

Organizations using AI interviews reported:

  • 12% more job offers extended
  • 18% more candidates starting their roles
  • 16% higher 30-day retention rates

These improvements suggest AI screening, when implemented properly, surfaces better-matched candidates without reducing quality. The structured, bias-reduced evaluation process also increases access to qualified candidates who might otherwise be filtered out.

Candidate feedback is also important. When offered a choice between a human recruiter and an AI interviewer, 78% of applicants preferred the AI. They cited fairness, efficiency, and schedule flexibility as the main reasons. Transparent AI interview processes improve candidate experience rather than harm it.

What Really Happens in an AI Interview

Modern AI interview platforms combine multiple technologies.

Natural language processing allows systems to understand responses contextually, not just match keywords. The system can probe deeper when a candidate mentions a particular solution or concept, ensuring dynamic, adaptive interviews.

For technical roles, AI platforms often include live coding environments across 30+ programming languages. These platforms assess code quality, problem-solving, efficiency, and framework familiarity. Question libraries, such as HackerEarth’s 25,000+ vetted questions, are mapped to specific skills and roles.

Some platforms use video avatar technology to simulate a more natural interaction. This reduces candidate anxiety and encourages authentic responses, producing better evaluation data.

AI systems also mask personal identifiers to prevent unconscious bias. Candidate evaluation is based solely on demonstrated ability.

Where Human Judgment Remains Essential

AI interviews handle high-volume screening and structured evaluation, but human judgment remains critical. Final decisions, culture fit assessments, and relationship-building still require human oversight.

AI complements human recruiters by allowing them to focus on high-impact decisions rather than repetitive tasks.

Bias mitigation is another consideration. Leading platforms implement diverse training datasets, bias audits, and transparent evaluation methods. Organizations should verify how vendors handle these aspects.

What to Evaluate When Selecting a Platform

Not all AI interview platforms are equal. Key criteria include:

  • Question library depth: Role-specific, vetted questions provide better assessment signals
  • Adaptive questioning: Follow-up questions based on responses reveal deeper insights
  • Proctoring and security: Real-time monitoring, AI-likeness detection, and secure browsers are essential
  • Integration with ATS: Smooth integration prevents operational friction
  • Candidate experience: Lifelike avatars and intuitive interfaces reduce drop-offs and enhance employer brand
  • Data security and compliance: Robust encryption and privacy compliance are mandatory
  • Proven enterprise adoption: Platforms used by top companies validate reliability and scalability

Getting Implementation Right

Successful AI interview deployment focuses on process design, not just software.

  • Define scope clearly: AI works best in specific stages of the hiring funnel, typically after initial applications and before final human-led rounds
  • Be transparent with candidates: Inform applicants about AI interviews to improve trust and experience
  • Correlate AI scores with outcomes: Track performance, retention, and satisfaction to refine the process
  • Invest in recruiter training: Recruiters shift from screening to interpreting AI insights and focusing on high-value interactions

So, What’s the Real Impact?

AI interviews solve measurable problems, including limited interviewer bandwidth, inconsistent evaluation, scheduling friction, and geographic constraints. Research supports their effectiveness as a scalable, structured layer that enhances screening quality without replacing human judgment.

For organizations hiring technical talent at scale in 2026, the focus is on how to implement AI-powered interviews effectively rather than whether to adopt them. The tools, evidence, and candidate acceptance are already in place. Success comes from thoughtful process design.

HackerEarth offers AI-powered technical assessments and interviews, including OnScreen, its always-on AI interview agent with lifelike avatars and end-to-end proctoring. It serves 500+ enterprise customers globally, including Walmart, Amazon, Barclays, GE, and Siemens, supporting 100+ skills, 37 programming languages, and 25,000+ vetted questions.

Introducing HackerEarth OnScreen: AI-powered interviews, around the clock

Introducing HackerEarth OnScreen: AI-powered interviews, around the clock

Tech hiring has a blind spot, and it's not the resume pile, the take-home tests, or even the interview itself. It's the gap between when a great candidate applies and when your team is available to talk to them. That gap costs you more top talent than any competitor does.

Today, HackerEarth OnScreen closes it permanently.

The real cost of scheduling friction

Most companies assume they lose candidates to better offers. The data tells a different story.

A developer weighing two opportunities almost always moves forward with the company that responded first, not the one that sent a calendar invite for Thursday. AI-generated resumes have flooded inboxes, making screening harder. Engineering teams the people best positioned to evaluate technical depth have limited hours. Recruiters are under pressure to move faster while maintaining quality.

Something had to change.

What OnScreen does

OnScreen doesn't just automate scheduling. It conducts the interview.

A candidate who applies at 11 PM gets a full interview before Monday morning through lifelike AI avatars with built-in identity verification and proctoring. The experience is a genuine two-way conversation: dynamic, adaptive, and role-calibrated. This is not a chatbot filling out a scorecard.

One enterprise customer screened more than 2,000 candidates in a single weekend with complete consistency and zero interviewer bias.

"Recruiters are under pressure more than ever. The volume of applicants has surged, AI-generated resumes have made initial screening harder, and the risk of missing the right candidate keeps climbing. OnScreen was built so that no qualified candidate is overlooked because nobody was available to interview them."
— Vikas Aditya, CEO, HackerEarth

Three capabilities, combined for the first time

In-depth interviewing that evaluates reasoning, not recall.
OnScreen conducts dynamic technical conversations that adapt to how each candidate responds. It probes the depth of knowledge, follows threads, and evaluates the quality of thinking behind each answer not just whether the answer is correct. Every interview runs on a deterministic framework: the same structure for every candidate and no panel-to-panel variation.

Integrated proctoring, built in from the start:
Enterprise-grade proctoring is woven directly into the interview flow not bolted on as an afterthought. Legitimate candidates won't notice it. The ones who shouldn't be in your pipeline will.

KYC-grade candidate verification
OnScreen brings identity verification standards from financial services into technical hiring. Proxy candidates, resume misrepresentation, and skills that don't match the application – all three gaps were closed at the source.

What hiring teams are saying

"Before OnScreen, we had no reliable way to measure candidate quality, especially with the rise of AI-generated CVs. Now, screening is far more objective. Roles that previously took much longer are now being closed within three to four weeks."
— Pawan Kuldip, Head of Human Resources, Discover Dollar Inc.

Built for everyone in the process

For engineering teams:
Fewer hours on screening calls. Senior engineers focus on final-round conversations, not first-pass filters.

For recruiters:
Pipelines that move. Candidates evaluated and scored before the week starts.

For candidates:
A consistent, skills-first experience, regardless of when they apply or where they're located.

OnScreen integrates directly into HackerEarth's existing platform alongside Hiring Challenges, Technical Assessments, and FaceCode. It extends your interviewing capacity without adding headcount.

The hiring bar just got higher. Everywhere.

Top talent expects swift, fair processes. Companies that deliver both, at scale, around the clock, will hire the engineers everyone else is still scheduling calls about.

OnScreen is now live for enterprise customers. Request access at hackerearth.com/ai/onscreen.

HackerEarth powers technical hiring at Google, Amazon, Microsoft, and 500+ global enterprises. The platform supports 10M+ developers across 1,000+ skills and 40+ programming languages.

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.

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