10/24/2026 updated
PV
100 % available
Senior Backend & Full-Stack Engineer (Node.js, TypeScript, NestJS, PostgreSQL)
Linda a Velha, Portugal
Only remote
About me
Backend/full-stack engineer, 20 years in production systems, two-time CTO. TypeScript, Node.js, NestJS, PostgreSQL, MongoDB, Redis, Docker, Vue/Nuxt. Live SaaS products, legacy migrations, LLM/RAG on own infrastructure. Claude Code and MCP daily. Remote from Portugal, B2B via own company.
Amazon Web ServicesDevOpsPostgreSQLMongoDBNode.jsRedisLarge Language ModelsVue.jsBackendBackend ProgrammingFull Stack DevelopmentNestJSDockerMicroservices
Full-Stack & Backend Engineering (TypeScript, Node.js, NestJS)
Twenty years of backend and full-stack engineering experience, building products end to end including data layer, API, web and mobile clients, and deployment. Core stack includes TypeScript, Node.js, NestJS, Express, Vue, Nuxt, and Quasar/Capacitor.
AI Integration & Self-Hosted LLM Infrastructure
Expertise in putting AI into production on own infrastructure, including LLM integration, RAG, embeddings, CPU reranking, Qdrant vector database, self-hosted models on GPU, OCR, and TTS. No reliance on third-party model APIs.
Large-Scale Web Data Collection & Scraping
Design and operation of large-scale web collection pipelines in production, covering proxies, retries, caching, rate control, JavaScript-rendered pages, anti-bot defences, and browser automation with Puppeteer, Playwright, and the Chrome DevTools Protocol.
Database Engineering & SQL Performance
Deep experience with PostgreSQL, MySQL, MongoDB, Redis, and Prisma, including SQL performance tuning, query-plan analysis, and rewriting access patterns for high-traffic systems.
Platform & DevOps
Solo deployment and infrastructure management using Docker, Linux, pm2, CI on push, AWS, and Railway. Experience moving production workloads between cloud providers based on cost and architecture decisions.
Microservices & Multi-Tenant Architecture
Architecture and delivery of microservices and multi-tenant platforms, including REST APIs, NestJS microservices, and multi-entity data models for FinTech and SaaS products.
AI Tooling & Agentic Workflows
Daily use of agentic coding tools including Claude Code and MCP servers, prompt engineering, model comparison across releases, and code review and evaluation of AI-generated code.
.NET, C#, Ruby on Rails & Native iOS (Swift)
Approximately 10 years of experience with .NET and C#, including high-load Windows service architectures and multithreaded services. Additional experience with Ruby on Rails for campaign-management platforms and native iOS development in Swift.
FinTech & Fund Administration Domains
Ownership of architecture and delivery of hedge-fund and private-investment management platforms, covering fund administration, commission campaigns, reconciliation, multi-entity data models, and fine-grained authorization with CASL.
Twenty years of backend and full-stack engineering experience, building products end to end including data layer, API, web and mobile clients, and deployment. Core stack includes TypeScript, Node.js, NestJS, Express, Vue, Nuxt, and Quasar/Capacitor.
AI Integration & Self-Hosted LLM Infrastructure
Expertise in putting AI into production on own infrastructure, including LLM integration, RAG, embeddings, CPU reranking, Qdrant vector database, self-hosted models on GPU, OCR, and TTS. No reliance on third-party model APIs.
Large-Scale Web Data Collection & Scraping
Design and operation of large-scale web collection pipelines in production, covering proxies, retries, caching, rate control, JavaScript-rendered pages, anti-bot defences, and browser automation with Puppeteer, Playwright, and the Chrome DevTools Protocol.
Database Engineering & SQL Performance
Deep experience with PostgreSQL, MySQL, MongoDB, Redis, and Prisma, including SQL performance tuning, query-plan analysis, and rewriting access patterns for high-traffic systems.
Platform & DevOps
Solo deployment and infrastructure management using Docker, Linux, pm2, CI on push, AWS, and Railway. Experience moving production workloads between cloud providers based on cost and architecture decisions.
Microservices & Multi-Tenant Architecture
Architecture and delivery of microservices and multi-tenant platforms, including REST APIs, NestJS microservices, and multi-entity data models for FinTech and SaaS products.
AI Tooling & Agentic Workflows
Daily use of agentic coding tools including Claude Code and MCP servers, prompt engineering, model comparison across releases, and code review and evaluation of AI-generated code.
.NET, C#, Ruby on Rails & Native iOS (Swift)
Approximately 10 years of experience with .NET and C#, including high-load Windows service architectures and multithreaded services. Additional experience with Ruby on Rails for campaign-management platforms and native iOS development in Swift.
FinTech & Fund Administration Domains
Ownership of architecture and delivery of hedge-fund and private-investment management platforms, covering fund administration, commission campaigns, reconciliation, multi-entity data models, and fine-grained authorization with CASL.
Experience
Professional experience10+ years
Freelancer since2012
Languages
EnglishFluentRussianNative speakerHebrewFluent
Project history
Built and operated multiple live products: Belanco (invoice SaaS for Portuguese businesses using NestJS microservices, PostgreSQL, Nuxt, Vue/Quasar/Capacitor, Mistral OCR and LLM extraction, AES-256-GCM encryption), RipeBanana (Amazon seller analytics with a published Chrome extension and large-scale collection pipeline), and a fleet fuel management platform (multi-tenant, raw TCP to physical pumps, NestJS + Prisma, live legacy migration). Also deployed AI on own infrastructure: embeddings, reranking, Qdrant, self-hosted LLMs on GPU. Infrastructure handled solo with Docker, Linux, pm2, CI on push, AWS, and Railway.
Owned architecture and delivery of two hedge-fund and private-investment management platforms. Covered fund administration, distribution through agents and agencies, commission campaigns and templates, reconciliation, portfolio-level agreements, import wizard for third-party financial files, multi-entity data model, currency classes and rates, audit trail, fine-grained authorization with CASL, Microsoft Graph and Azure MSAL integration. Also built a native iOS app in Swift for a national supermarket chain with indoor positioning via Estimote beacons, location-triggered coupons, Firebase, and Hebrew/RTL localisation. Stack: TypeScript, Express, Vue, Vuetify, MongoDB, Swift, Microsoft Graph, Azure MSAL, JWT.
Backend services and system integration for a large-scale smart home platform in an enterprise engineering organization, focusing on reliability, performance, and structured architecture.