Vocab - Vocabulary Learning App
Built the mobile and web app for a vocabulary learning platform powered by spaced repetition and generative AI.
React NativeNextjsPostgresPrismaExpoTypeScriptTailwindCloudFlareGenerative AI
Mobile App / Web App
Looking for an Engineer Who Delivers?
Meet Sergey Dubovik, an experienced TypeScript, React, and React Native engineer who turns rough ideas into production-ready software that scales.
I work with startups and established businesses, focusing on:
- Clear communication – straightforward, no jargon.
- Dependable development – from prototypes to production.
- Layer in AI features (LLMs, vector search, chatbots) that solve real user problems, not just demo well.
- Harden codebases for scale – test coverage, CI/CD, monitoring, infra as code.
Why I get hired:
- 13+ years shipping products for SaaS startups and enterprise clients
- Rapid iterations in short feedback loops
- Proven stack: React, React Native, TypeScript, Node.js, SQL/Postgres, AWS, GCP, Cloudflare
- Solo or alongside your team – I slot in, own the roadmap, and deliver
I have led architecture, mentored teams and produced production code on every project – zero slideware, all shipping.
If you need an engineer who gets things done, let's talk.
Enterprise AI Training & Implementation
Turn your team's AI pilots into production-ready workflows. I help leaders, ops and engineering implement AI tools and workflows that actually improve output and productivity.
Learn about my AI training programsPast Project Highlights
Some of the products I've helped build and the tech behind them.
S-kaupat - Online Grocery Store
Worked on the React Native app and Next.js storefront for S-group's online grocery delivery platform.
React NativeNextjsGraphQLStarship DAASAWSTypeScript
Mobile App / Web App
Swappie
Developed the e-commerce frontend for a refurbished phone marketplace serving millions of users a year.
ReactTypeScriptGraphQLNodeGoogle Cloud
Web App
HSL - Helsinki Public Transport app
Worked on Helsinki's public transport app – trip planning, ticketing, and real-time arrival tracking for buses and trains.
React NativeGraphQLNodeAzureFlowType
Mobile App
Crazy Days (Stockmann)
Built the flash-sale platform for Stockmann's flagship Crazy Days campaign – high-traffic, time-limited deals.
ReactFlowTypeGraphQLNodeAWS
Web App
Platta
Built a content and ad platform to bring A-Lehdet's print magazines online.
ReactFlowTypeGraphQLNodeAWS
Web App
Get in Touch
Have a question or want to discuss a project? Reach out!