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Andrii Sirko

@andriisirko

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I build scalable React and TypeScript products across e-commerce, fintech, SaaS, and AI platforms.

Germany

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What I'm looking for

I'm looking to build high-impact product experiences where I can own architecture, improve delivery speed, and work across React, TypeScript, backend systems, and AI/LLM features.

I've delivered product features for ABOUT YOU's 40M+ MAU shop, including self-serve experiment activation, a mobile add-to-basket experience that lifted conversion by 5%, and the loyalty Status Program rollout.

At Mehrwerk, I owned the architecture of a 1M+ MAU multi-tenant platform, reducing client onboarding from four months to 30 minutes. I also built a real-time UI Editor, led accessibility work, and created load-testing coverage for SSR and GraphQL services.

As a freelance full-stack engineer, I've built enterprise AI collaboration, token metering, billing, and RBAC features for meinGPT, alongside React platforms for automotive, fintech, ad-tech, and SaaS products.

Experience

Work history, roles, and key accomplishments

Current

Senior Frontend / Full-Stack Engineer

Current

Freelancer

Sep 2019 - Present (7 years)

Delivered multi-year and repeat engagements for German and international product companies, including ABOUT YOU, Mehrwerk, SelectCode, eBay, Accenture, Factor Eleven, lemon.markets, and ToolTime.

React TypeScript Next.js NodeJS NestJS tRPC GraphQL gRPC Prisma PostgreSQL MongoDB Kotlin Java Python PHP Jest Cypress Playwright Storybook AWS Docker CI CD Kubernetes Gitlab CI Datadog RAG OpenAI API LLM Integrations

Senior Software Developer

Careem

Jun 2018 - Aug 2019 (1 year 2 months)

Led frontend architecture for the corporate-customers product and maintained the shared Web UI library. Contributed to last-mile delivery and CareemNow platforms, and served as Scrum master for a team of 6.

React React Native Redux Saga TypeScript Jest Cypress Kotlin Scala MySQL AWS Docker Jenkins

Frontend Developer

Circula GmbH

Nov 2017 - May 2018 (6 months)

Built expense-management tools for accountants and supervisors using React, Redux, and Ruby on Rails.

React Redux Ruby on Rails

Full Stack Developer

Mes.mo GmbH / Gastroguide

Jan 2015 - Oct 2017 (2 years 9 months)

Architected the restaurant platform including reservation system, website constructor, advertising system, form/menu builders, and REST API for mobile apps, serving 15 restaurants.

React Redux Flux PHP MySQL AWS