Today, we are continuing our series, entitled <a href="https://codestory.co/tag/developer-chats/" rel="nofollow">Developer Chats</a> - hearing from the large scale system builders themselves.In this episode, we are talking with <a href="https://www.linkedin.com/in/petr-petrenko-006534150/" rel="nofollow">Petr Petrenko</a>, Senior PHP Backend Engineer at <a href="https://www.bumble.com/" rel="nofollow">Bumble</a>. Petr will take us through his developer journey, in working on large scale backends, managing the tension between stability and innovation, and designing systems to interact with culturally different economies.Questions<ul><li>You’ve worked on large-scale backends that serve millions of users. At what point do systems start to outgrow the teams that built them?</li><li>At some point, every mature backend reaches a stage where rewriting is no longer realistic. How do you recognize when a system has crossed that line, and what’s the right way to handle it?</li><li>There’s always this tension between stability and innovation. How do you decide when a system needs refactoring versus when you just need to live with the technical debt?</li><li>Let’s talk about the human side of legacy systems — what have you learned about culture, documentation, and knowledge transfer that keeps old systems alive and reliable?</li><li>You’ve also built and maintained complex payment systems for global users. What’s something most engineers underestimate about cross-border transactions?</li><li>When you’re designing systems that deal with different currencies, laws, and tax regulations, how do you balance the technical with the ethical — for example, user privacy or data sovereignty?</li><li>For engineers listening who want to build something durable — not just fast — what advice would you give about writing code that will still make sense years from now?</li><li>One of your most impressive projects is a high-performance image-matching system you built yourself, capable of scanning tens of millions of images with sub-second results. Can you walk us through the moment you realized you needed to redesign the system — and what engineering choices made that level of performance possible?</li><li>You’ve also worked on billing systems and fraud mitigation at scale. Was there ever a moment when you had to choose between a technically “clean” solution and a solution that better protected users or the business? How did you make that call?</li></ul>Sponsors<ul><li><a href="http://incogni.com/codestory" rel="nofollow">Incogni</a></li><li><a href="https://nordprotect.com/codestory" rel="nofollow">NordProtect</a></li><li><a href="https://ventionteams.com/codestory" rel="nofollow">Vention</a></li><li>CodeCrafters helps you become a better engineer by building real-world, production-grade projects. Learn hands-on by creating your own Git, Redis, HTTP server, SQLite, or DNS server from scratch. Sign up for free today using this <a href="https://l.mailtrack.com/l/23126a66ca05e0f5c6fed5631effe0f55a6e32d1?u=12932909" rel="nofollow">link</a> and enjoy 40% off.</li><li><a href="https://productdriven.com/codestory" rel="nofollow">Full Scale</a></li><li><a href="https://www.paddle.com/" rel="nofollow">Paddle.com</a></li><li><a href="https://www.semasoftware.com/" rel="nofollow">Sema Software</a></li><li><a href="https://www.propelauth.com/" rel="nofollow">PropelAuth</a></li><li><a href="https://www.postman.com/podcast/codestory" rel="nofollow">Postman</a></li><li><a href="https://www.meilisearch.com/?utm_campaign=podcast&utm_medium=ad&utm_source=codestory" rel="nofollow">Meilisearch</a></li></ul>Links<ul><li><a href="https://www.bumble.com/" rel="nofollow">https://www.bumble.com/</a></li><li><a href="https://www.linkedin.com/in/petr-petrenko-006534150/" rel="nofollow">https://www.linkedin.com/in/petr-petrenko-006534150/</a></li></ul> Our Sponsors: * Check out Incogni: https://incogni.com/codestory * Check out NordProtect: https://nordprotect.com/codestory Support this podcast at — <a rel='payment' href='https://redcircle.com/code-story-insights-from-startup-tech-leaders/donations'>https://redcircle.com/code-story-insights-from-startup-tech-leaders/donations</a> Advertising Inquiries: <a href='https://redcircle.com/brands'>https://redcircle.com/brands</a> Privacy & Opt-Out: <a href='https://redcircle.com/privacy'>https://redcircle.com/privacy</a>

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