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I’m a Lead Full Stack & AI Engineer from Poland with 10+ years of experience building end-to-end software for enterprise, SaaS, and product environments. I enjoy turning complex requirements into clean, secure, and highly scalable web platforms—combining strong .NET (C#) and Node.js backend work with modern frontend engineering in React, Next.js, and Angular. A big part of my work is integrating AI into real products. I’ve shipped production-ready features that use LLMs and custom AI workflows (including OpenAI-based solutions and prompt orchestration), backed by well-designed data pipelines and robust testing/CI practices. I also focus heavily on performance, multi-database architecture (PostgreSQL, MS SQL Server, MongoDB, and more), and cloud deployments across AWS/Azure/GCP to deliver reliable outcomes.…I’m a Lead Full Stack & AI Engineer from Poland with 10+ years of experience building end-to-end software for enterprise, SaaS, and product environments. I enjoy turning complex requirements into clean, secure, and highly scalable web platforms—combining strong .NET (C#) and Node.js backend work with modern frontend engineering in React, Next.js, and Angular. A big part of my work is integrating AI into real products. I’ve shipped production-ready features that use LLMs and custom AI workflows (including OpenAI-based solutions and prompt orchestration), backed by well-designed data pipelines and robust testing/CI practices. I also focus heavily on performance, multi-database architecture (PostgreSQL, MS SQL Server, MongoDB, and more), and cloud deployments across AWS/Azure/GCP to deliver reliable outcomes.

Sylwester Siudym

Full Stack Developer, Software Engineer, Web Developer, +4

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I’m a Lead Full Stack & AI Engineer from Poland with 10+ years of experience building end-to-end software for enterprise, SaaS, and product environments. I enjoy turning complex requirements into clean, secure, and highly scalable web platforms—combining strong .NET (C#) and Node.js backend work with modern frontend engineering in React, Next.js, and Angular. A big part of my work is integrating AI into real products. I’ve shipped production-ready features that use LLMs and custom AI workflows (including OpenAI-based solutions and prompt orchestration), backed by well-designed data pipelines and robust testing/CI practices. I also focus heavily on performance, multi-database architecture (PostgreSQL, MS SQL Server, MongoDB, and more), and cloud deployments across AWS/Azure/GCP to deliver reliable outcomes.…I’m a Lead Full Stack & AI Engineer from Poland with 10+ years of experience building end-to-end software for enterprise, SaaS, and product environments. I enjoy turning complex requirements into clean, secure, and highly scalable web platforms—combining strong .NET (C#) and Node.js backend work with modern frontend engineering in React, Next.js, and Angular. A big part of my work is integrating AI into real products. I’ve shipped production-ready features that use LLMs and custom AI workflows (including OpenAI-based solutions and prompt orchestration), backed by well-designed data pipelines and robust testing/CI practices. I also focus heavily on performance, multi-database architecture (PostgreSQL, MS SQL Server, MongoDB, and more), and cloud deployments across AWS/Azure/GCP to deliver reliable outcomes.

Available to hire

I’m a Lead Full Stack & AI Engineer from Poland with 10+ years of experience building end-to-end software for enterprise, SaaS, and product environments. I enjoy turning complex requirements into clean, secure, and highly scalable web platforms—combining strong .NET (C#) and Node.js backend work with modern frontend engineering in React, Next.js, and Angular.

A big part of my work is integrating AI into real products. I’ve shipped production-ready features that use LLMs and custom AI workflows (including OpenAI-based solutions and prompt orchestration), backed by well-designed data pipelines and robust testing/CI practices. I also focus heavily on performance, multi-database architecture (PostgreSQL, MS SQL Server, MongoDB, and more), and cloud deployments across AWS/Azure/GCP to deliver reliable outcomes.

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Work Experience

Lead Full Stack &AI Engineer / Lead Software Engineer (Contract) at Nielsen

September 1, 2024 - May 1, 2026

Architected scalable full-stack applications using Next.js, React, Angular, Node.js, and .NET Core, designing robust frontend/backend and multi-database layers for business-critical workflows. Engineered high-performance APIs and intelligent features by integrating Machine Learning models and OpenAI APIs with prompt orchestration into production-ready platforms. Optimized backend systems and database queries across PostgreSQL and MS SQL Server, tuning Node.js and ASP.NET Core microservices and service integrations to improve latency, scalability, and security. Established automated testing, quality gates, and technical documentation for AI and full-stack releases, increasing deployment confidence and team velocity.

Lead Full Stack &AI Engineer at Nielsen

September 1, 2024 - May 1, 2026

Architected scalable full-stack applications using Next.js/React/Angular, Node.js, and .NET Core, designing robust frontend, backend, and multi-database layers for business-critical workflows. Engineered high-performance APIs and AI-enabled features integrating machine learning models and OpenAI APIs with prompt orchestration, delivered via TypeScript, C#, SQL, and cloud CI/CD pipelines. Optimized backend systems and database queries across PostgreSQL and MS SQL Server, tuning Node.js and ASP.NET Core microservices for improved latency, scalability, and security. Established automated testing, quality gates, and technical documentation for AI and full-stack releases to increase deployment confidence and team velocity.

Senior Software Engineer at Jasper

July 1, 2020 - August 31, 2024

Delivered end-to-end SaaS features and intelligent data workflows using React, Next.js, Angular, Node.js, and .NET Core. Modernized legacy architectures into high-performance TypeScript/Next.js-React modules using RTK Query and Zustand, creating reusable frontend patterns and optimized REST APIs. Architected and integrated AI/ML capabilities, embedding intelligent models, custom AI workflows, and automated data pipelines for personalization and automation. Optimized system performance and scalability across the full stack through Node.js and .NET service boundary refinements, improved data access patterns in PostgreSQL and MongoDB, and implemented rigorous CI/CD and automated testing pipelines.

Founding Software Engineer at HigoSense

October 1, 2017 - June 30, 2020

Architected early-stage product infrastructure from loosely defined requirements, delivering scalable Next.js/React frontends, robust Node.js/.NET backends, and optimized SQL/NoSQL database layers aligned with product goals. Engineered high-throughput REST APIs and SQL-backed data pipelines with AI/LLM and machine learning integrations, powering realtime Socket.io communication and data-driven features. Orchestrated full-stack technical strategy including cloud deployments (AWS/Azure), DevOps, and code quality across three years of rapid startup execution. Led and mentored engineering teams through pragmatic design tradeoffs, code reviews, and AI/ML best practices to accelerate delivery cycles.

Software Development Manager at Redwerk

July 1, 2014 - August 31, 2017

Led enterprise software delivery across distributed engineering teams, coordinating Java, .NET, frontend work (AngularJS/React), backend, databases, and DevOps with technical and business priorities. Directed architecture reviews, database query optimization, performance improvements, and delivery planning to improve scalability, maintainability, and reliability of multi-layer enterprise applications. Guided developers through Agile/Scrum execution, code reviews, technical documentation, and quality-focused delivery practices to improve team output and stakeholder visibility.

Full Stack Java Developer at Redwerk

May 1, 2012 - June 30, 2014

Engineered full stack Java and enterprise applications with robust backend services and JavaScript interfaces, SQL data access (MS SQL Server/PostgreSQL), REST-style integrations, and CI practices. Optimized application logic, database queries, and microservice integration flows to improve performance, reduce defects, and increase maintainability. Delivered clean, secure, and maintainable code while collaborating cross-functionally on implementation details, testing, and technical documentation.

Full Stack Developer at UKEESS Software House

August 1, 2010 - April 30, 2012

Developed web application features across frontend, backend, database, and integration layers using JavaScript and SQL, improving user-facing functionality and dependable client delivery. Enhanced responsive user interfaces and API-connected workflows with SQL-backed modules while maintaining code quality, documentation, and repeatable testing practices.

Junior Software Developer at UKEESS Software House

August 1, 2009 - July 31, 2010

Implemented application features and fixed defects while strengthening frontend and backend fundamentals through hands-on delivery over one year.

Software Engineer Intern at HP

June 1, 2008 - July 31, 2009

Contributed to software engineering tasks including debugging, documentation, and quality improvements while building foundational enterprise development practices.