Freelancer profile translated to English.
Back to original languageAbout Nicolas
Node.js / TypeScript backend developer, I design and optimize robust, maintainable, and observable APIs.
I work on backend, PostgreSQL, and AWS environments, with a particular focus on application performance, code quality, and processing reliability. My experience covers REST API development, SQL query optimization, asynchronous processing, and improving observability through structured logs, execution time measurement, and flow analysis.
Concrete topics covered: PostgreSQL search optimization, API performance tests, CloudWatch log analysis, robustness of AWS asynchronous processes (Lambda, SQS, Kinesis), and implementation of structured logs with duration tracking.
I am primarily looking for targeted technical missions focused on API performance, PostgreSQL optimization, and backend service reliability.
French
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- EY FabernovelBackend Engineer Node.js / TypeScript — Performance APIJanuary 2026 - Today (7 months)Development and optimization of NestJS REST APIs in a Node.js / TypeScript environment structured as an Nx monorepo.Work on backend search and performance issues: PostgreSQL, TypeORM, query builders, pagination, query optimization, and dedicated indexes. Also contribute to input validation, OpenAPI documentation, error handling, and securing developments through unit, e2e, and integration tests.Involvement in API performance topics: implementation of load tests, analysis of processing times, and identification of bottlenecks on the backend and SQL sides.
- EY FabernovelTechnical Consultant — Backend, Performance APIApril 2022 - December 2025 (3 years and 8 months)4 years of experience in technical environments with a strong backend, observability, AWS, and SQL component.Involvement in core library and tooling subjects for development teams, with a focus on system reliability, visibility, and performance:- Building and evolving shared technical components / libraries- Monitoring and observability of application flows- Incident analysis, technical investigation, and robustness improvement- Exploiting SQL queries for analysis, diagnosis, and optimization- Working in AWS environments and distributed architectures- Close collaboration with development teams on performance, service quality, and maintainability issues
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Education
- ENGINEEREISTI2022Ingénieur Informatique : spécialisation intelligence artificielle