Christos Panagiotakopoulos

I’m a builder. I’ve spent my career building products and the systems behind them: platform infrastructure at scale at BeReal, and before that web3 products and chatbot platforms used by millions.

Now I own the technical direction at Prelude, where I lead the engineering team building onboarding and auth infrastructure for platforms: verification and anti-fraud systems designed to be faster, cheaper, and harder to abuse, all at once. I’m responsible for what we ship and how it holds up at scale, and I still write code alongside the team.

The Prelude team gathered for a group photo in the office
The Prelude team

Originally from Athens, Greece, I now live in Paris, France. In my free time I play Greek rembetiko music on the guitar and administer the rembetiko.gr community.

From time to time I share thoughts, projects and ideas on my blog.

Timeline

Sep 2014 I was admitted to the School of Electrical & Computer Engineering of the National Technical University of Athens.

Mar 2016 Built “When is my bus coming” (“Πότε έρχεται το λεωφορείο μου”), a Facebook chatbot that informed users of the estimated time of arrival of buses in Athens, Greece. At its peak, it was serving over 20,000 weekly users. (press references: iEfimerida, noupou.gr)

Sep 2017 - Jul 2021 Working at Enneas, a software house based in Athens, Greece. There, I designed their chatbot infrastructure from scratch and worked with large Greek organizations such as Cosmote and OPAP to ship it into production.

Aug 2021 - Feb 2023 Working at Capsule Social as Lead Backend Engineer. We released Blogchain, a decentralized, censorship-resistant blogging platform where articles are stored on IPFS. (press references: TechCrunch 2021, NearWeek, ProductHunt)

Feb 2022 Moved to Paris, France.

Mar 2023 Built Paroles.gr, a web app built on NestJS, React, PostgreSQL and TypeScript that allows users to easily search the lyrics of Greek songs.

Mar 2023 - Aug 2024 Working at BeReal as Senior Platform Engineer. I designed and built backend services in Go and NodeJS that powered BeReal’s core features, including the relationship graph that handled hundreds of millions of relationships during the daily 2-minute notification, and the post service that handled millions of reads and writes per second. Several of these services ran at over 1M req/s, and I cut their running cost. I also took part in the on-call rotation as an incident commander during major incidents.

Sep 2024 Started working at Prelude as a Senior Software Engineer. I designed and built Prelude’s Auth product and its v2 API, launched its email verification system, worked on anti-fraud against SMS pumping, and improved OTP phone verification conversion rates.

Sep 2025 Promoted to Engineering Manager at Prelude. I lead the team behind its verification and anti-fraud products and own their technical direction, while staying hands-on with the code.

May 2026 Prelude raised a $20M Series A led by 20VC, shipped its Auth API and Intel API the same day, and was named one of Europe’s top 50 startups. I lead the engineering team behind these products.