Description

Senior Full-stack Engineer (TypeScript) (front-end focused) proficient in development with React, Next.js,

NestJS, Prisma, TypeScript, JavaScript and its ecosystem, building scalable and accessible web applications on a

contract or freelance basis for international companies ranging from startups to large enterprises. A dedicated, highly

creative and conscientious team player who enjoys challenges and working on own initiative, with experience in

leadership and personal and professional development, and exceptional communication skills with great attention to

detail.

"A talented developer with a product engineer mindset who thinks beyond code to deliver product value."

"Lukas has a great ability to make complex problems feel seamless."

"Impressed by his attention to technical detail and continuing passion to improve his skills and learn new ones."

Industry field of expertise

Languages

English
Native or bilingual

Workplace preferences

Remote only

Primarily works remotely

Freelance Contractor
Senior Frontend engineer
December 2025 - Today (8 months)
• ● Led development of the real-time AI grammar correction on the web app and the Chrome extension —
accurately highlighting and correcting errors inside any editable field on any website, live as users type, without slowing input or breaking host pages. (React, TypeScript, MV3 / WXT)
• ● Designed, built and shipped SeedTree — a cross-platform desktop app (Electron, React, TypeScript) delivering AI-generated subliminal affirmations, now with a growing base of paying users. Took it solo from concept to paid product on the Mac App Store and Microsoft Store, with native Windows (x64/ARM) and Apple Silicon builds, Stripe + Apple in-app-purchase licensing, automated code-signing/notarization, and CI/CD with e2e test coverage.
• ● Optimized a media streaming web player's rendering lifecycle for low-spec TV hardware, leveraging vanilla JavaScript and React memoization to slash frame drops by 50% during HD playback.
• ● Developed a highly responsive real-time analytics portal utilizing Tailwind CSS and RTK, reducing initial page interactive latency by 35% through dynamic code-splitting.
• ● Conducted rigorous code reviews and authored comprehensive architecture blueprints for a SaaS client, standardizing React patterns that accelerated new feature onboarding by 40%.
Typescript React.js JavaScript CSS3 HTML5
Cognizant American IT Consulting
Senior Frontend Engineer
December 2024 - December 2025 (1 year)
● Owned the front-end of a manufacturing operations admin platform for IKEA, building a complex, data-
heavy React.js / TypeScript dashboard with schema-validated (Zod) data flows that gave operations teams a
single reliable control surface — cutting 30% off manual data entry time at enterprise scale.
● Re-engineered global application state using nested React Contexts and Redux, consolidating asynchronous
operations to eliminate 90% of redundant API polling.
● Optimized complex data table rendering and virtualization on low-spec enterprise inventory tablets, boosting
interface responsiveness by 40%.
● Led daily code reviews and established automated frontend unit testing structures, preventing over 95% of
regression bugs from reaching production releases.
● Standardized highly responsive UI components styled with Tailwind CSS, accelerating frontend delivery
sprint velocity by 25% while maintaining strict visual alignment.
Extrica.com
Contract Senior Frontend Engineer
December 2023 - December 2024 (1 year)
• ● Overhauled the research portal's data fetching layer using RTK Query and React Contexts, reducing state related interface lag by 30% and boosting data caching efficiency.
• ● Led front-end development of the science research platform and managed the full project lifecycle. Established documentation standards for architecture decisions and developer onboarding.
• ● Delivered the product using Node.js with TypeScript (NestJS), TypeScript/JavaScript, and Vite.js. The company partnered with ResearchGate, which has 25M+ researchers.
• ● Implemented reusable components by translating the Figma design system and collaborating with designers and key stakeholders.
• ● Created automated E2E tests using Playwright to ensure application reliability and maintainability.
• ● Experience with TDD (Test-Driven Development), accessibility, cross-browser compatibility, Azure, participate in code reviews.