Freelancer profile translated to English.
Back to original languageAbout Romain
Specializing in backend development (Node.js, TypeScript) and scalable infrastructure, I help companies design, deploy, and optimize their high-performance systems.
With nearly two years of experience as a PostgreSQL/TimescaleDB Database Administrator, Backend Developer, and DevOps Engineer at Fantasy, I have acquired solid expertise in scaling applications and managing high-write volume infrastructures (from 500 users to over 200,000).
Thanks to this experience, I am now able to support a company from A to Z — from creating a robust backend architecture to production deployment, through to continuous scalability and performance optimization.
Optimization, security, and reliability are at the core of my technical approach.
🎓 A graduate with a Master's degree in Cybersecurity (University of Kent, UK) and a diploma in Information Technology Expertise (Epitech), I combine a solid academic background with numerous practical freelance experiences, ranging from backend development to scaling systems with high data volumes.
French
Native or bilingual
English
Fluent
Can work on-site
Lyon (up to 50km)
Experience
- Fantasy.topBackend Engineer / DevOps — Data & Platform SystemsPRIVATE EQUITYMarch 2024 - December 2025 (1 year and 9 months)Lisbonne, PortugalJoined during beta and contributed to mainnet launch and rapid scaling from ~1K to over 100K users during peak activity.• Designed and operated a high-throughput Twitter data indexing pipelineprocessing hundreds of millions of daily events.• Built anti-botting systems protecting engagement metrics and game mechanics from automated abuse (Python, panda).• Contributed to backend refactor from Hasura to NestJS REST APIs, improving business-logic control and observability.• Developed core backend features including leaderboards, ranking systems, and modular ELO-based gamification logic.• Implemented Cloudflare caching and backend cache-control strategies to reduce latency and offload backend traffic on low-volatility endpoints.• Led backend performance and reliability improvements focused on ingestionthroughput and queue stability.Performance & scaling:• Optimized PostgreSQL and TimescaleDB ingestion workloads (~300M dailyinsert/ update ops, ~3,200 TPS).• Introduced staging tables and bulk COPY pipelines, reducing WAL contention and I/ O pressure.• Migrated high-volume tables to TimescaleDB hypertables with compression,reducing storage and IOPS by ~50%.• Implemented monitoring with PMM and pg_stat; continuously tuned queries,indexes, and schema design.• Stabilized platform under ~17K IOPS, avoiding a planned ~$10K/ monthinfrastructure upgrade.Tech: TypeScript, Python, panda, Node.js, NestJS, PostgreSQL, TimescaleDB,Redis, Docker, AWS, Cloudflare, CI/ CD
- Junior Conseil TakerFullstack DeveloperTECHDecember 2021 - December 2024 (2 years and 11 months)Frontend Development (Next js) of a web application in the medical field for a foreign country.Frontend Development (Next Js) of a web application in the agricultural field with the EU.Website link v1: https://logipre.org/
- ProovupBack-End DeveloperMay 2023 - June 2023 (1 month)• Designed an optimized TypeScript microservice for aircraft flight load management at MetaFlight, handling 1–5K simultaneous aircraft in real time.• Implemented Redis caching, Socket.io updates, and a queuing system to reduce database load.• Ensured strong security with JWT and API key authentication, comprehensive documentation, and seamless integration within the company's infrastructure.
Reviews
Sébastien
NITBY
Reviewed on 2/5/2024
We called on Romain for his cybersecurity skills on AWS. We needed to activate AWS WAF. Romain advised us perfectly and delivered in a few days. We now keep him as our cyber expert. We highly recommend him.
D
Déborah
Gilbert
Reviewed on 6/14/2022
Great experience! Romain is junior but very reliable: he asks (and asks himself) the right questions, works quickly and well... He evolved our specific node.js plugin, which is not always easy to work on after another developer, and it went much faster than expected. In short, I highly recommend him and will not hesitate to call on him again.
Recommendations
HH
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Education
- Expert in Information TechnologyEpitech Lyon
- Master's degree in Cyber Security (certified by GCHQ, the UK government intelligence and security agency)University of KentDomains of study: - Authentication, Authorization, Security Accounting - Cryptography (Rsa, Homomorphic encryption) - Network security - Information security - Privacy (K-anonymity, l-diversity, T-closeness)
Certifications
- DIGITAL TRANSFORMATION CERTIFICATEHEC PARIS DMI2022