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I am Karol Skupski, a results-driven Senior Full-Stack Engineer with extensive experience in PHP, Laravel, CodeIgniter, and WordPress. I specialize in building scalable web applications and robust back-end systems, and I enjoy collaborating with cross-functional teams to deliver high-quality solutions. I have a proven track record of optimizing performance, streamlining development processes, and mentoring junior engineers. I'm a strong communicator and team player focused on continuous improvement and fostering innovative solutions.…I am Karol Skupski, a results-driven Senior Full-Stack Engineer with extensive experience in PHP, Laravel, CodeIgniter, and WordPress. I specialize in building scalable web applications and robust back-end systems, and I enjoy collaborating with cross-functional teams to deliver high-quality solutions. I have a proven track record of optimizing performance, streamlining development processes, and mentoring junior engineers. I'm a strong communicator and team player focused on continuous improvement and fostering innovative solutions.

Karol Skupski

Full Stack Developer, Back-End Developer, Front-End Developer, +5

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I am Karol Skupski, a results-driven Senior Full-Stack Engineer with extensive experience in PHP, Laravel, CodeIgniter, and WordPress. I specialize in building scalable web applications and robust back-end systems, and I enjoy collaborating with cross-functional teams to deliver high-quality solutions. I have a proven track record of optimizing performance, streamlining development processes, and mentoring junior engineers. I'm a strong communicator and team player focused on continuous improvement and fostering innovative solutions.…I am Karol Skupski, a results-driven Senior Full-Stack Engineer with extensive experience in PHP, Laravel, CodeIgniter, and WordPress. I specialize in building scalable web applications and robust back-end systems, and I enjoy collaborating with cross-functional teams to deliver high-quality solutions. I have a proven track record of optimizing performance, streamlining development processes, and mentoring junior engineers. I'm a strong communicator and team player focused on continuous improvement and fostering innovative solutions.

Available to hire

I am Karol Skupski, a results-driven Senior Full-Stack Engineer with extensive experience in PHP, Laravel, CodeIgniter, and WordPress. I specialize in building scalable web applications and robust back-end systems, and I enjoy collaborating with cross-functional teams to deliver high-quality solutions.

I have a proven track record of optimizing performance, streamlining development processes, and mentoring junior engineers. I’m a strong communicator and team player focused on continuous improvement and fostering innovative solutions.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Language

English

Fluent

Polish

Fluent

Work Experience

Senior Software Engineer at Vincit Oyj

July 1, 2025 - October 20, 2025

Led architecture and implementation of large-scale PHP applications using Laravel and CodeIgniter; spearheaded adoption of modern DevOps practices with CI/CD pipelines using GitLab CI and Docker; integrated third-party APIs; optimized database queries reducing data retrieval times by 30%; mentored junior engineers; designed and developed RESTful APIs; led sprint planning and code reviews.

Senior Full-stack Engineer at Vincit Oyj

July 1, 2025 - October 6, 2025

Designed and implemented scalable microservices using C# (.NET Core, ASP.NET Web API) and Python (FastAPI); built responsive web interfaces with Angular, React, Next.js, and TailwindCSS; optimized database performance with PostgreSQL, MySQL, and DynamoDB using Entity Framework and Dapper; refactored backend for asynchronous processing with Redis caching and Hangfire; led migration from monolith to microservices using Docker, Kubernetes, and Kafka; developed low-code enterprise workflows with Appian; built an AI assistant using LangChain/LangGraph for patient and clinician guidance; automated CI/CD with GitHub Actions, Terraform, and Kubernetes; achieved 90%+ test coverage; collaborated with DevOps to deploy serverless microservices on AWS; aligned software solutions with business objectives.

Senior Fullstack Engineer at Netguru

December 1, 2022 - October 20, 2025

Developed and maintained scalable web applications using PHP, Laravel, and WordPress; collaborated with front-end teams to deliver seamless user experiences; implemented automated unit testing with PHPUnit; managed database migrations and query optimization, reducing server load; participated in agile processes and client engagements; provided technical leadership and mentoring.

Full-stack Engineer at Netguru

December 1, 2022 - October 6, 2025

Designed and developed backend platform using ASP.NET Core Web API; Architected microservice-based data pipelines; built dynamic frontend with Vite, TypeScript, TailwindCSS, Angular (NgRx) and React, with AI-driven recommendations; Visualized large datasets using AG-Grid and Angular Material; Exposed internal and external RESTful and GraphQL APIs; Integrated OpenAI-driven tagging/classification modules; Led CI/CD automation with GitHub Copilot and NUnit in GitHub Actions; Implemented SSO with Okta across Jira, Slack, internal dashboards; Optimized EF queries and middleware for performance.

Junior Backend Engineer at WeAreBrain

May 1, 2018 - October 20, 2025

Developed back-end solutions using PHP and CodeIgniter; assisted in troubleshooting and performance optimization; wrote efficient, reusable PHP code; contributed to innovative technical solutions and team brainstorming.

Junior Engineer at WeAreBrain

May 1, 2018 - October 6, 2025

Contributed to full-stack projects across diverse clients; Built interactive UI with React, AngularJS, and vanilla JS; Implemented backend logic in ASP.NET/.NET Framework; Implemented real-time features (WebSockets, push notifications); Designed relational schemas and complex SQL queries in PostgreSQL; Collaborated with seniors, designers, and clients to deliver robust features.