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Technical Consultant and Software Engineer with 10+ years of experience helping teams modernize legacy products, simplify complex systems, and deliver software with confidence. I specialize in quickly taking over existing products—often with limited documentation—by reconstructing how they work, identifying blockers, and creating practical delivery paths. I work across frontend, backend, databases, cloud/DevOps, and mobile when it helps move the product forward. Based in Poland with international remote experience (USA, UK, Singapore, and Europe), I focus on clear architecture decisions, measurable performance improvements, and reliable shipping.…Technical Consultant and Software Engineer with 10+ years of experience helping teams modernize legacy products, simplify complex systems, and deliver software with confidence. I specialize in quickly taking over existing products—often with limited documentation—by reconstructing how they work, identifying blockers, and creating practical delivery paths. I work across frontend, backend, databases, cloud/DevOps, and mobile when it helps move the product forward. Based in Poland with international remote experience (USA, UK, Singapore, and Europe), I focus on clear architecture decisions, measurable performance improvements, and reliable shipping.

Tomasz Koszkul

Web Developer, Full Stack Developer, Front-End Developer, +2

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Technical Consultant and Software Engineer with 10+ years of experience helping teams modernize legacy products, simplify complex systems, and deliver software with confidence. I specialize in quickly taking over existing products—often with limited documentation—by reconstructing how they work, identifying blockers, and creating practical delivery paths. I work across frontend, backend, databases, cloud/DevOps, and mobile when it helps move the product forward. Based in Poland with international remote experience (USA, UK, Singapore, and Europe), I focus on clear architecture decisions, measurable performance improvements, and reliable shipping.…Technical Consultant and Software Engineer with 10+ years of experience helping teams modernize legacy products, simplify complex systems, and deliver software with confidence. I specialize in quickly taking over existing products—often with limited documentation—by reconstructing how they work, identifying blockers, and creating practical delivery paths. I work across frontend, backend, databases, cloud/DevOps, and mobile when it helps move the product forward. Based in Poland with international remote experience (USA, UK, Singapore, and Europe), I focus on clear architecture decisions, measurable performance improvements, and reliable shipping.

Available to hire

Technical Consultant and Software Engineer with 10+ years of experience helping teams modernize legacy products, simplify complex systems, and deliver software with confidence. I specialize in quickly taking over existing products—often with limited documentation—by reconstructing how they work, identifying blockers, and creating practical delivery paths.

I work across frontend, backend, databases, cloud/DevOps, and mobile when it helps move the product forward. Based in Poland with international remote experience (USA, UK, Singapore, and Europe), I focus on clear architecture decisions, measurable performance improvements, and reliable shipping.

Skills

Experience Level

Expert

Expert

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Intermediate

Beginner

Work Experience

Technical Consultant & Software Engineer at Animality Foundation

March 1, 2026 - Present

Took over disconnected WordPress and Flutter projects after the prior team left, setting up local development environments, Git repositories, and Docker workflows. Performed a technical assessment against business requirements and produced a delivery roadmap with 200+ actionable tasks. Delivered production-ready improvements across web and mobile, including subscriptions, invoicing, backend integrations, and stability fixes. Successfully launched the Flutter mobile application to the Apple App Store while continuing development of the web platform.

Lead Software Engineer at SpecCheck

March 1, 2022 - March 1, 2026

Led modernization of a large legacy application, driving architectural decisions and frontend strategy. Planned and executed an incremental Vue 2 to Vue 3 migration without disrupting active product development. Redesigned component architecture around reusable building blocks to improve maintainability and scalability. Established frontend engineering standards, led code reviews, and acted as primary technical decision maker for frontend architecture. Improved performance by removing unnecessary backend queries and simplifying data flow, working across frontend, backend, and database layers to unblock delivery.

Senior Frontend Engineer at Xcelirate

April 1, 2020 - March 1, 2022

Joined an existing React and Redux product, quickly becoming a key contributor to feature delivery and frontend quality. Built reusable React components and scalable state management patterns for a growing social platform. Improved maintainability through consistent component design and production-ready UX. Collaborated with UX designers and backend engineers to deliver responsive features. Resolved complex UI issues by analyzing state, data flow, and rendering behavior.

Full Stack Software Engineer at Desap

June 1, 2019 - April 1, 2020

Developed key features for a real-time online learning platform using React, .NET, and SignalR to create a virtual classroom experience. Built a collaborative whiteboard with real-time synchronization between teachers and students using SignalR. Designed a responsive coordinate mapping system to preserve drawing accuracy across screen sizes and aspect ratios. Integrated video communication using Sinch and fixed a browser compatibility issue inside a compiled third-party library to avoid an expensive platform migration. Worked across frontend and backend components to deliver reliable real-time collaboration features.

Frontend Engineer at Xcelirate

April 1, 2019 - March 1, 2020

Contributed to modernization of a live platform by delivering a complete UI redesign without disrupting daily operations. Implemented an incremental rollout approach allowing users to switch between old and new experiences during migration. Coordinated with designers and backend engineers to ensure smooth transition and consistent user experience. Delivered new features continuously while maintaining production stability and supporting an active live environment.

Software Engineer at bet365

April 1, 2017 - June 1, 2018

Developed frontend solutions for high-traffic web applications while applying an engineering mindset focused on problem solving, performance, and long-term maintainability. Contributed to a custom frontend framework built to modernize legacy applications without relying on external libraries. Implemented complex interactive UI components by solving real-world rendering and layout challenges beyond standard browser behavior. Collaborated with senior engineers on structured problem solving, software design, automated testing, and code review practices.

Frontend Software Developer at Electrika Ltd

May 1, 2016 - June 1, 2017

Built and maintained custom Umbraco CMS, AngularJS, and JavaScript solutions, turning unfamiliar technology into working production software.

Web Developer at Bounce Castle Network

October 1, 2015 - May 1, 2016

Built responsive web interfaces using HTML, CSS, Bootstrap, and JavaScript, developing the frontend foundation for later work.