09/03/2026 updated
60 % partially available
Senior Full Stack Product Engineer (TypeScript, C#)
Cakovec, Croatia
Only remote
M.Sc. in Information SystemsAbout me
Senior full-stack product engineer with 15 years’ SaaS experience across web, mobile, and desktop. 6 years on a market-leading construction platform. Strong in TypeScript, Node.js, React, PostgreSQL, .NET, product discovery, UX, AI tooling, and end-to-end delivery.
.NET FrameworkjQueryPostgreSQLNode.jsNext.jsTypeScriptReact.jsExpress.jsFull Stack DevelopmentReact Redux
TypeScript & Full-Stack Development
Extensive expertise in TypeScript-based full-stack development using Node.js (Express), React, Next.js, and PostgreSQL. Delivery of production-grade SaaS applications across web, mobile, and desktop over 15 years of professional experience.
PostgreSQL & Database Architecture
Deep knowledge of PostgreSQL in multi-tenant architectures, including schema normalization, JSONB to FK column migrations, multi-step rollout and backfill migrations with Drizzle ORM, and authoring audit and fix scripts via GitHub Workflows.
Testing & Quality Engineering
Comprehensive testing culture covering unit, integration, and UI layers with Vitest, Playwright E2E, React Testing Library, Meticulous visual regression in CI, and Storybook. Advocacy for ESLint/Prettier standards and codebase-health initiatives.
Feature Flag Lifecycle & Observability
Full feature-flag lifecycle management with LaunchDarkly including flag design, targeting, staged rollouts, monitoring, and cleanup. Use of Mixpanel, Metabase, Datadog, and Sentry for adoption tracking and post-launch measurement.
Cloud & AI Integration
Hands-on experience with AWS (S3, Lambda, ECS, SQS), Vercel, and Supabase including pgvector. Integration of OpenAI and Anthropic APIs, RAG/embeddings, MCP, and n8n automations. Rapid prototyping with Claude Code and Cursor.
React Architecture & Modernization
Leadership in React modernization efforts, migrating from class to function components and hooks, replacing redux-connected HOC containers with react-redux hooks, and implementing Redux/Redux-Saga and TanStack Query patterns.
Backend API & Event-Driven Systems
Design and implementation of REST APIs, CQRS services, RabbitMQ message-queue integrations, and event-driven reporting pipelines. Experience decomposing monoliths into modular microservices.
CI/CD & DevOps
Implementation of CI/CD pipelines using Jenkins and GitHub Actions, automating builds, artifacts, and error reporting. Use of Docker for containerized deployments.
Product Engineering & Cross-Team Collaboration
Product engineering across the full lifecycle: discovery, scoping, RFCs, refinement facilitation, cross-team alignment, staged rollouts, and post-launch monitoring. Experience as Epic Anchor co-leading with Product and Design.
ERP & B2B Integration Development
Full-stack development of flagship ERP systems (CSLA.NET, Oracle, ASP.NET, Knockout.js) covering finance, logistics, and procurement. Building B2B REST integrations processing thousands of daily transactions and WMS applications.
Extensive expertise in TypeScript-based full-stack development using Node.js (Express), React, Next.js, and PostgreSQL. Delivery of production-grade SaaS applications across web, mobile, and desktop over 15 years of professional experience.
PostgreSQL & Database Architecture
Deep knowledge of PostgreSQL in multi-tenant architectures, including schema normalization, JSONB to FK column migrations, multi-step rollout and backfill migrations with Drizzle ORM, and authoring audit and fix scripts via GitHub Workflows.
Testing & Quality Engineering
Comprehensive testing culture covering unit, integration, and UI layers with Vitest, Playwright E2E, React Testing Library, Meticulous visual regression in CI, and Storybook. Advocacy for ESLint/Prettier standards and codebase-health initiatives.
Feature Flag Lifecycle & Observability
Full feature-flag lifecycle management with LaunchDarkly including flag design, targeting, staged rollouts, monitoring, and cleanup. Use of Mixpanel, Metabase, Datadog, and Sentry for adoption tracking and post-launch measurement.
Cloud & AI Integration
Hands-on experience with AWS (S3, Lambda, ECS, SQS), Vercel, and Supabase including pgvector. Integration of OpenAI and Anthropic APIs, RAG/embeddings, MCP, and n8n automations. Rapid prototyping with Claude Code and Cursor.
React Architecture & Modernization
Leadership in React modernization efforts, migrating from class to function components and hooks, replacing redux-connected HOC containers with react-redux hooks, and implementing Redux/Redux-Saga and TanStack Query patterns.
Backend API & Event-Driven Systems
Design and implementation of REST APIs, CQRS services, RabbitMQ message-queue integrations, and event-driven reporting pipelines. Experience decomposing monoliths into modular microservices.
CI/CD & DevOps
Implementation of CI/CD pipelines using Jenkins and GitHub Actions, automating builds, artifacts, and error reporting. Use of Docker for containerized deployments.
Product Engineering & Cross-Team Collaboration
Product engineering across the full lifecycle: discovery, scoping, RFCs, refinement facilitation, cross-team alignment, staged rollouts, and post-launch monitoring. Experience as Epic Anchor co-leading with Product and Design.
ERP & B2B Integration Development
Full-stack development of flagship ERP systems (CSLA.NET, Oracle, ASP.NET, Knockout.js) covering finance, logistics, and procurement. Building B2B REST integrations processing thousands of daily transactions and WMS applications.
Experience
Professional experience10+ years
Freelancer since2020
Languages
EnglishFluentPortugueseGoodCroatianNative speaker
Project history
Live PWA training log and wellness tracker (sleep, diet, exercise sessions with logged sets/weights) with per-exercise progress charts and a built-in MCP server so users can log and query via their favorite LLM. Daily-use product with real users.
Context-aware email reply assistant for tour operators: RAG over an embedded knowledge base using OpenAI embeddings and completions, Vite/React frontend, Supabase backend (pgvector, auth, API); designed for integrations with booking tools (FareHarbor, Bokun, TrekkSoft). In progress.
5.5 years on one product team building a construction estimation SaaS (React + Node.js/Express + TypeScript + multi-tenant PostgreSQL on AWS). Acted as Epic Anchor co-leading with Product and Design across 4 major epics. Tech lead on migration to AG Grid, drove React modernization, designed a dependency-graph recalculation engine, owned significant PostgreSQL work in a database-per-tenant architecture, ran full feature-flag lifecycle in LaunchDarkly, drove testing-culture shift, advocated for codebase-health initiatives, resolved critical performance bottlenecks, and prototyped with AI tooling.