/// Curriculum vitæ
Raphaël
Lemaitre.
Backend engineer with 26 years on the JVM, including about ten years of functional Scala. I'm a Senior Backend Engineer at Nabla, building the real-time dictation backend in Kotlin. I have been a CTO and went back to coding by choice. I care about type safety, simple systems and teams that ship. On the side, I speak at Scala conferences and maintain open-source Scala libraries.
Paris area, FR
EN · FR
Experience
- → now
Senior Backend Engineer
Nabla — Dictation squad
- Real-time dictation transcription pipeline backend.
- Formatting post-processing.
- Written in Kotlin.
- →
Senior Staff Engineer
Ledger
- Architected ATLAS, Ledger's blockchain indexing platform for fast transaction and balance access.
- Built high-availability Scala backend services for Ledger's core products.
- Ran PostgreSQL at scale and a fleet of blockchain nodes.
- Analyzed and optimized cryptocurrency protocols to improve data indexing and query speeds.
- Benchmarked services to find and fix bottlenecks, with CI/CD and monitoring behind every deployment.
- →
CTO, previously Lead Developer
Adventori
- →
R&D Senior Developer
Systar
- →
R&D Engineer
Xcalia
- →
Software Architect
Capgemini
- →
Team Leader
E-Deal
Skills
Languages
Scala, Kotlin, Java, Groovy, SQL, TypeScript, JavaScript, HTML, CSS
Data
PostgreSQL, SQLite, Apache Cassandra, Apache Spark
Ops & tools
Kubernetes, Docker, Gatling, Git, GitHub, GitLab, CI/CD
Talks
- ×3 · 2024–2025From Zero to Production Faster Than Your Average Meeting With PillarsFunctional Scala · Scalar · ScalaIO
- ×5 · 2023–2024Armored Type Safety With IronScala Matters · ScalaIO · Scalar · ScalaMatsuri · Functional Scala
- ×1 · 2024Fearless Coding: Scala 3 and Iron, the New Heroes of Reliability in Functional ProgrammingSunnyTech
- ×2 · 2024Hacking ADHD: Strategies for the Modern DeveloperDevoxx France · SunnyTech
Education
1997 → 2001