10/21/2026 updated
100 % available
Senior Full-Stack Developer | TypeScript, Node.js, NestJS, React, Next.js, PostgreSQL, AI/LLM
Paris, France
Germany +25
Bachelor of Science (BSc) in Computer Science, Aurel Vlaicu University, Arad, Romania (2019-2022)info: Germany, Austria, Switzerland, United Kingdom, USA, Spain, Italy, Liechtenstein, Hungary, France, Australia, Belgium, Denmark, Finland, Georgia, Canada, Luxembourg, Monaco, Netherlands, Poland, Portugal, Romania, Slovenia, Moldova, Azerbaijan, Andorra
About me
Senior full-stack developer, 6+ years: TypeScript, Node.js/NestJS, React/Next.js, PostgreSQL, Docker, CI/CD. Co-founder and CTO of a multi-tenant SaaS ERP in production. LLM integration (Claude, OpenAI, Mistral). Remote from Paris or on-site across Europe, B2B via my French company. EN, FR, RO, RU.
GitHub ActionsTailwind CSSLLMOpenAISoftware as a ServiceUser Interface DesignPostgreSQLNode.jsPrism (Software)Next.jsShopifyTypeScriptOpenapiReact.jsStripe
Senior Full-Stack Developer with 6+ years of experience building SaaS products end to end with TypeScript, Node.js, NestJS, React, Next.js and PostgreSQL. I design the data model, build the REST API, ship the front end, set up CI/CD and run the product in production.
Backend development
Node.js and NestJS in TypeScript are my core backend stack: REST APIs documented with OpenAPI, service-oriented and multi-tenant SaaS architecture, authentication, RBAC, webhooks and third-party integrations. Also Express.js. I have built and operated NestJS APIs for a multi-tenant ERP, a customer-loyalty SaaS and an expertise-request platform.
Frontend development
React and Next.js (App Router) with TypeScript and Tailwind CSS. I build fast, accessible, maintainable interfaces and own the full feature from PostgreSQL schema to React component. JavaScript, HTML, CSS, responsive design, web performance.
Databases
PostgreSQL in production for every product: data modelling, migrations, query optimisation, Drizzle ORM and Prisma. Also MySQL and S3-compatible object storage.
Cloud and DevOps
Docker, CI/CD pipelines with GitHub Actions, Linux VPS administration, PM2, Vercel, OVH Object Storage, EU hosting and GDPR by design. Git and GitHub for every project.
AI and LLM integration
I integrate large language models into products: Anthropic Claude API and Claude Agent SDK, OpenAI API, Mistral API. AI agents, agent orchestration, prompt engineering, tool design, evaluation and product integration, always for precise, well-framed tasks with every output path reviewed before release. Slack bots with Bolt.
Integrations
Pennylane, Stripe, Shopify, WooCommerce, PrestaShop, HubSpot, Slack.
Selected results
BIRP (co-founder and CTO): multi-tenant SaaS ERP in Next.js, NestJS and PostgreSQL with 6 modules, REST API with OpenAPI, 20+ integrations, Docker and CI/CD; at an agri-food client the monthly close went from 10 to 2 days and manual work dropped by 62%.
Aliias Expert: SaaS platform delivered end to end in React, Next.js, NestJS and PostgreSQL, with open REST APIs for client applications.
Wheelyz: gamified customer-loyalty SaaS, in production since 2023.
Templaw: legal AI assistant built on Anthropic Claude, OpenAI and Mistral, validated by a DPO and a law firm.
Practices
End-to-end feature ownership, software architecture, code review, automated testing, technical design, agile delivery, technical leadership of small teams, direct work with founders, Product and Design.
Working setup
Remote from Paris (CET, overlap with US Eastern) or on-site across Europe, including Switzerland. B2B contract through my French company, payrolling possible for Swiss on-site assignments. Languages: English, French, Romanian, Russian.
Typical assignments: full-stack developer TypeScript, backend developer Node.js / NestJS, frontend developer React / Next.js, tech lead for SaaS products.
Experience
Professional experience5 - 10 years
Freelancer since2020
Languages
EnglishFluentFrenchNative speakerRomanianNative speakerRussianNative speaker
Project history
Building a B2B e-commerce and rental platform for medical equipment serving care homes, for a French healthcare equipment company. Full-stack development in TypeScript: Next.js front end, NestJS REST API, PostgreSQL data model. Product catalogue and stock back office, customer accounts for care homes, ordering and quote workflows, equipment rental with contract periods and returns, online payment integration, invoicing exports. Docker, CI/CD with GitHub Actions, EU hosting, GDPR by design for health-sector customer data. Direct work with the business owner: scoping, technical design, delivery in iterations.
Skills: Next.js, NestJS, TypeScript, PostgreSQL, REST API, e-commerce, Stripe, Docker, CI/CD, GDPR.
Co-founded Templaw (legal tech) and lead its technical design and delivery. Built a legal AI assistant for legal professionals on the Anthropic Claude, OpenAI and Mistral APIs: conversational assistant, prompt and tool design, agent orchestration, evaluation of outputs and guardrails, with every output path reviewed before release. Full-stack implementation in TypeScript with Next.js, NestJS and PostgreSQL; Docker, CI/CD with GitHub Actions, EU hosting and GDPR by design (data minimisation, access control, audit trail). The assistant was validated by a DPO and a law firm before launch.
Skills: LLM integration, AI agents, prompt engineering, Anthropic Claude, OpenAI, Mistral, TypeScript, Next.js, NestJS, PostgreSQL, Docker, CI/CD, GDPR.
Designs and builds a multi-tenant ERP in Next.js, NestJS and PostgreSQL with Drizzle ORM covering invoicing, purchasing, sales, inventory, production, finance and HR. Owns the API architecture with REST APIs and OpenAPI plus 20+ native integrations (Pennylane, Stripe, Shopify, WooCommerce, PrestaShop, HubSpot). Builds birpAI, the in-product AI copilot for AI agents, data analysis and automation of recurring tasks. Manages CI/CD pipeline, Docker, automated tests, EU hosting and GDPR by design, with customer go-live in 30 to 60 days.