Hi, I'm Jakub
Senior Front-end
& Full-Stack Developer.
I build scalable React, Next.js and TypeScript applications across HealthTech, insurance and AI evaluation. I enjoy clean architecture, thoughtful UI, and applying AI in practical, useful ways.
About me
A few honest words about what I do and how I work.
I've spent the last six years building production web applications — most recently in HealthTech, insurance, and AI evaluation. My work usually sits at the intersection of React, Next.js, and TypeScript, with serious attention to architecture decisions, testing, and the kind of code that the next person on the team will actually enjoy reading.
I care about doing things properly: writing ADRs, designing low-level structures, mentoring teammates, and quietly raising the quality bar in the codebases I touch. Outside of client work, I explore AI prompt engineering and generative graphics — I successfully sell my prompts on PromptBase and generated visuals on stock platforms. It is a parallel craft that keeps me close to where the industry is moving.
Architecture-minded
ADRs, low-level design, and shared component libraries
AI in practice
Prompt engineering, LLM evaluation, and building tools that actually use the models.
Mentor & onboarder
Efficient introduction of new team members thanks to the efficient transfer of knowledge and my passion for sharing it.
Skills & tools
A grouped view of what I work with day to day.
Frontend & Frameworks
React, Next.js, Nx Monorepo, Angular, Micro-frontends, React Native
Languages
TypeScript, JavaScript, C#, Java, SCSS / SASS, HTML
State & Data
Redux Toolkit, Zustand, TanStack Query, Zod, REST APIs, GraphQL
Backend & Database
Node.js, ASP.NET Core, .NET, SQLite, Drizzle ORM, Nginx
Testing & QA
Playwright, Jest, React Testing Library, Cypress, Enzyme, Unit tests
Tools & Workflow
Git, Jira, Linear, Figma, Docker, Vite.js, Storybook, GCP
AI & LLM systems
Prompt engineering, Claude AI, Model evaluation, GitHub Copilot, Generative graphics
Architecture & Practice
ADRs, Low-level design, Component libraries, CSP security, Code review
Collaboration
Mentoring, Distributed teams, Documentation, User stories, Onboarding
Experience
Six years across HealthTech, insurance, and AI evaluation.
Senior Software Engineer at Ascaisoft (2026.01 — Now), Warsaw, Poland (Remote)
AI training, evaluation, and performance benchmarking. Designing complex tasks, prompts, and datasets for LLMs. Onboarding engineers in an 8-person distributed team. Tech: Next.js, React, Redux Toolkit, TypeScript, Tailwind, TanStack Query, Zod, SQLite, Drizzle ORM, Playwright, Claude AI, Linear, Docker.
Front-end Developer at Diagnostyka (2023.03 — 2026.01), Warsaw, Poland (Remote)
Laboratory research configuration software and medical test sales management for patient collection sites. Shared component library documented in Storybook. Low-level architecture and ADRs supporting the company's stock-market entry. CSP security policy compliance. Tech: Nx monorepo, React, Redux Toolkit, TypeScript, SCSS, REST API, React Testing Library, Jest, Vite.js, Zustand, TanStack, Storybook, Claude AI, Node.js, Nginx.
Front-end Developer at Devapo (2021.09 — 2023.02), Warsaw, Poland (Remote)
Modular HR platform hosted on GCP with custom component library, plus an insurance company module. Mentoring junior developers in a 9-person team. RESTful web services. Tech: Next.js, React, Redux Toolkit, TypeScript, Angular, Micro-frontends, SCSS, GraphQL, Enzyme, GCP, Docker, Cypress.
Front-end Developer at Accenture (2021.06 — 2021.09), Remote
Bench employment focused on training and skill development. Tech: React Native, TypeScript.
Front-end Web Developer at Wydawnictwo Media Creations (2021.01 — 2021.05), Biała Podlaska, Poland
Developed existing software and built a new portal. Collaborated with designer and back-end team. Custom web applications. Tech: TypeScript, React, Redux, SASS, Semantic UI, Node.js.
Junior Software Developer at Heller Consult (2020.02 — 2020.12), Biała Podlaska, Poland (Remote)
Road-network management software including back-end tasks. Desktop and mobile applications. Tech: JavaScript, TypeScript, React, ASP.NET Core, .NET, Windows Forms, Docker, Android, Java, Node.js.
Education & certifications
Foundations and ongoing professional development.
IT, Computer Networks & Cybersecurity
Państwowa Szkoła Wyższa im. Papieża Jana Pawła II — Biała Podlaska
2016 — 2020
Communication
- Polish Native
- English Upper-intermediate (B2)
Professional certifications
Prince2 Foundation
AXELOS Global Best Practice
ITIL Foundation
AXELOS Global Best Practice
Agile PM Foundation
APMG International
Beyond code
Side work that keeps the craft fresh.
AI prompt engineering & generative graphics
In my free time I design prompts and generate visuals with AI, including through my own application. A selection of the work is available on Adobe Stock and PromptBase.
Other interests
A few of the things that keep my mind active outside the code editor.
Let's talk
Open to interesting roles, freelance projects, and AI-adjacent work. Drop a line.