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Hi, I'm Tomasz Kolbus. I am a Senior Full Stack Engineer with 10 years of experience building scalable, high-performance web applications. I specialize in C#, SQL Server, JavaScript, HTML5, and CSS, and I enjoy delivering responsive, user-friendly frontends and robust backends. I excel at refactoring legacy systems, integrating REST APIs, and driving performance improvements to deliver reliable, high-quality software. I thrive in cross-functional teams, contributing to design, development, and CI/CD workflows, mentoring teammates, and ensuring timely releases that meet business goals. I'm passionate about delivering software that grows the business while prioritizing usability and maintainability. I enjoy collaborating across disciplines to create user-focused solutions that boost satisfaction and efficiency.…Hi, I'm Tomasz Kolbus. I am a Senior Full Stack Engineer with 10 years of experience building scalable, high-performance web applications. I specialize in C#, SQL Server, JavaScript, HTML5, and CSS, and I enjoy delivering responsive, user-friendly frontends and robust backends. I excel at refactoring legacy systems, integrating REST APIs, and driving performance improvements to deliver reliable, high-quality software. I thrive in cross-functional teams, contributing to design, development, and CI/CD workflows, mentoring teammates, and ensuring timely releases that meet business goals. I'm passionate about delivering software that grows the business while prioritizing usability and maintainability. I enjoy collaborating across disciplines to create user-focused solutions that boost satisfaction and efficiency.

Tomasz Kolbus

Full Stack Developer, Back-End Developer, Web Developer, +3

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Hi, I'm Tomasz Kolbus. I am a Senior Full Stack Engineer with 10 years of experience building scalable, high-performance web applications. I specialize in C#, SQL Server, JavaScript, HTML5, and CSS, and I enjoy delivering responsive, user-friendly frontends and robust backends. I excel at refactoring legacy systems, integrating REST APIs, and driving performance improvements to deliver reliable, high-quality software. I thrive in cross-functional teams, contributing to design, development, and CI/CD workflows, mentoring teammates, and ensuring timely releases that meet business goals. I'm passionate about delivering software that grows the business while prioritizing usability and maintainability. I enjoy collaborating across disciplines to create user-focused solutions that boost satisfaction and efficiency.…Hi, I'm Tomasz Kolbus. I am a Senior Full Stack Engineer with 10 years of experience building scalable, high-performance web applications. I specialize in C#, SQL Server, JavaScript, HTML5, and CSS, and I enjoy delivering responsive, user-friendly frontends and robust backends. I excel at refactoring legacy systems, integrating REST APIs, and driving performance improvements to deliver reliable, high-quality software. I thrive in cross-functional teams, contributing to design, development, and CI/CD workflows, mentoring teammates, and ensuring timely releases that meet business goals. I'm passionate about delivering software that grows the business while prioritizing usability and maintainability. I enjoy collaborating across disciplines to create user-focused solutions that boost satisfaction and efficiency.

Available to hire

Hi, I’m Tomasz Kolbus. I am a Senior Full Stack Engineer with 10 years of experience building scalable, high-performance web applications. I specialize in C#, SQL Server, JavaScript, HTML5, and CSS, and I enjoy delivering responsive, user-friendly frontends and robust backends. I excel at refactoring legacy systems, integrating REST APIs, and driving performance improvements to deliver reliable, high-quality software. I thrive in cross-functional teams, contributing to design, development, and CI/CD workflows, mentoring teammates, and ensuring timely releases that meet business goals.

I’m passionate about delivering software that grows the business while prioritizing usability and maintainability. I enjoy collaborating across disciplines to create user-focused solutions that boost satisfaction and efficiency.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Language

English

Advanced

Work Experience

Senior Software Engineer at BetterQA

January 1, 2023 - Present

Designed and developed C# MVC web applications with SQL Server for enterprise modules, achieving a 30% backend response improvement. Integrated REST APIs and JSON data pipelines to enhance data exchange and reduce client-side errors by 25%. Refactored legacy code to boost performance and maintainability across multiple modules. Built responsive UIs with JavaScript, HTML5, CSS, and Bootstrap to boost cross-device usability. Collaborated with product and engineering teams to plan and deliver features, cutting delivery time by 15%. Optimized Git workflows to reduce merge conflicts by 40%, and mentored junior developers in full-stack practices.

Senior Software Engineer at BetterQA

January 1, 2023 - Present

Led development of C# MVC web applications with SQL Server, delivering a 30% backend performance improvement for enterprise modules. Integrated REST APIs and JSON data pipelines, enhancing data exchange and reducing client-side errors by 25%. Refactored legacy code across multi-module systems to boost performance and maintainability. Built responsive UIs with JavaScript, HTML5, CSS, and Bootstrap for improved cross-device usability. Collaborated with engineering and product teams to define, implement, and deliver features, cutting feature delivery time by 15%. Optimized Git workflows to reduce merge conflicts by 40%. Mentored junior developers on full-stack practices and performance optimization.

Senior Software Engineer at Itekako

December 1, 2022 - October 11, 2025

Developed backend modules in C#/.NET with SQL Server, boosting scalability and handling of high-traffic data by 30%. Integrated REST APIs with internal and third-party systems, improving data accuracy and reducing latency by 30%. Built front-end components with JavaScript, HTML5, CSS, and JQuery, improving UI responsiveness and cross-browser compatibility. Refactored database queries and server logic, reducing average response time from 1.5s to 0.9s. Implemented Git version control best practices, increasing deployment reliability and reducing rollback incidents by 25%.

Senior Software Engineer at Itekako

December 1, 2022 - October 11, 2025

Developed backend modules in C#/.NET with SQL Server, enabling better scalability and handling high-traffic data by 30%. Integrated REST APIs with internal and third-party systems, improving data accuracy and reducing latency by 30%. Built frontend components using JavaScript, HTML5, CSS, and JQuery, enhancing UI responsiveness and cross-browser compatibility. Refactored database queries and server logic, reducing average response time from 1.5s to 0.9s. Collaborated with teams to plan, design, and deliver features aligned with business needs. Implemented Git version control best practices, increasing deployment reliability and reducing rollback incidents by 25%.

Software Engineer at Pwrteams

March 1, 2018 - October 11, 2025

Assisted in backend development with C# and SQL Server, increasing data processing efficiency by 20%. Supported frontend development with JavaScript, HTML5, CSS, enhancing UI functionality and visual consistency. Integrated REST APIs and JSON data flows to enable seamless communication between backend and frontend applications. Participated in code refactoring and performance optimization, reducing technical debt and improving maintainability. Collaborated with teams on feature implementation and testing.

Software Engineer at Pwrteams

March 1, 2018 - October 11, 2025

Assisted in backend development with C# and SQL Server, increasing data processing efficiency by 20%. Supported frontend development with JavaScript, HTML5, CSS, enhancing UI functionality and visual consistency. Integrated REST APIs and JSON data flows, enabling seamless communication between backend and frontend applications. Participated in code refactoring and performance optimization, reducing technical debt and improving maintainability. Collaborated with teams on feature implementation and testing, improving system reliability and user experience metrics.