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Senior/Lead Full Stack Engineer with 10+ years of experience delivering end-to-end software for enterprise, SaaS, and product environments. Strong foundation in React, Next.js, Node.js/TypeScript and building production-ready REST microservices and scalable backend systems. Integrates AI/ML workflows and LLM capabilities into intelligent product features, with proven strengths in PostgreSQL/SQL tuning, cloud-backed delivery (AWS/Azure), CI/CD, and clean, secure, high-performance code. Experienced in mentoring, technical documentation, and raising quality gates through automated testing.…Senior/Lead Full Stack Engineer with 10+ years of experience delivering end-to-end software for enterprise, SaaS, and product environments. Strong foundation in React, Next.js, Node.js/TypeScript and building production-ready REST microservices and scalable backend systems. Integrates AI/ML workflows and LLM capabilities into intelligent product features, with proven strengths in PostgreSQL/SQL tuning, cloud-backed delivery (AWS/Azure), CI/CD, and clean, secure, high-performance code. Experienced in mentoring, technical documentation, and raising quality gates through automated testing.

Sylwester Siudym

Full Stack Developer, AI Engineer, Back-End Developer, +2

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Senior/Lead Full Stack Engineer with 10+ years of experience delivering end-to-end software for enterprise, SaaS, and product environments. Strong foundation in React, Next.js, Node.js/TypeScript and building production-ready REST microservices and scalable backend systems. Integrates AI/ML workflows and LLM capabilities into intelligent product features, with proven strengths in PostgreSQL/SQL tuning, cloud-backed delivery (AWS/Azure), CI/CD, and clean, secure, high-performance code. Experienced in mentoring, technical documentation, and raising quality gates through automated testing.…Senior/Lead Full Stack Engineer with 10+ years of experience delivering end-to-end software for enterprise, SaaS, and product environments. Strong foundation in React, Next.js, Node.js/TypeScript and building production-ready REST microservices and scalable backend systems. Integrates AI/ML workflows and LLM capabilities into intelligent product features, with proven strengths in PostgreSQL/SQL tuning, cloud-backed delivery (AWS/Azure), CI/CD, and clean, secure, high-performance code. Experienced in mentoring, technical documentation, and raising quality gates through automated testing.

Available to hire

Senior/Lead Full Stack Engineer with 10+ years of experience delivering end-to-end software for enterprise, SaaS, and product environments. Strong foundation in React, Next.js, Node.js/TypeScript and building production-ready REST microservices and scalable backend systems.

Integrates AI/ML workflows and LLM capabilities into intelligent product features, with proven strengths in PostgreSQL/SQL tuning, cloud-backed delivery (AWS/Azure), CI/CD, and clean, secure, high-performance code. Experienced in mentoring, technical documentation, and raising quality gates through automated testing.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

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Intermediate

Intermediate

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Intermediate

Work Experience

Lead Software Engineer at Nielsen

September 1, 2024 - May 1, 2026

Architected scalable full-stack applications using Next.js, React, and Node.js, designing robust frontend, backend, and data layers for business-critical workflows. Engineered high-performance APIs and intelligent features integrating ML/AI capabilities into production-ready platforms using TypeScript, SQL, and cloud CI/CD pipelines. Optimized Node.js microservices and database queries to improve latency, scalability, and security, establishing automated testing and technical documentation and strengthening code review standards for release confidence and faster delivery.

Senior Software Engineer at Jasper

July 1, 2020 - August 1, 2024

Delivered end-to-end SaaS features and intelligent data workflows using React, Next.js, and Node.js. Modernized legacy architectures into high-performance TypeScript/Next.js modules and built reusable frontend patterns, improving maintainability and development velocity. Architected and integrated AI/ML capabilities into SaaS features to enable personalization and automation, and optimized full-stack performance by refining service boundaries, improving data access patterns, and implementing rigorous CI/CD and automated testing pipelines.

Founding Software Engineer at HigoSense

October 1, 2017 - June 1, 2020

Architected early-stage product infrastructure from loosely defined requirements, delivering scalable Next.js frontends, robust Node.js backends, and optimized database layers aligned with business goals. Engineered high-throughput REST APIs and SQL-backed data pipelines and integrated AI/ML capabilities to support advanced product workflows and data-driven features. Led technical strategy across full-stack architecture, DevOps, and code quality and mentored teams through design tradeoffs, code reviews, and AI/ML engineering best practices to accelerate delivery.

Software Development Manager at Accenture Portugal

July 1, 2014 - August 1, 2017

Led enterprise software delivery across distributed engineering teams, aligning Java, frontend, backend, database, and DevOps workstreams with technical and business priorities. Directed architecture reviews, performance improvements, and delivery planning to strengthen scalability, maintainability, and reliability across multi-layer applications. Guided developers in Agile execution, code review practices, technical documentation, and quality-focused delivery to improve output and stakeholder visibility.

Full Stack Java Developer at Accenture Portugal

May 1, 2012 - June 1, 2014

Engineered full-stack Java applications with backend services, JavaScript interfaces, SQL data access, and REST-style integrations, supporting CI practices for enterprise use cases. Optimized application logic, database queries, and integration flows to improve performance, reduce defects, and increase maintainability. Delivered clean, secure, and maintainable code while collaborating with cross-functional teams on testing and technical documentation.

Full Stack Developer at Bliss Applications

August 1, 2010 - April 1, 2012

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

Junior Software Developer at Bliss Applications

August 1, 2009 - July 1, 2010

Implemented application features and fixed defects while strengthening frontend and backend fundamentals through hands-on delivery. Improved quality through debugging, iteration, and adherence to repeatable development and testing practices.

Software Engineer Intern at HP

June 1, 2008 - July 1, 2009

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