Martin Olsansky
About me
Hi 👋
I have 10+ years of experience as a full-stack software engineer, across cybersecurity, banking, fintech, video platforms, marketplaces and healthtech.
Co-founded a company [seasy.com] that raised 7-digit funding. We worked with ESA (European Space Agency), joined their innovation incubator and went through YC Startup School. I got to hire and work with some great people. We made money, put food on the table, and made our customers' lives easier.
Gave lightning talks about JS and React, and co-organised events on biotech, bioinformatics and biohacking. Did a bunch of Startup Weekends, and was a core member of a local hackerspace. Wrote some tech articles and contributed to open source.
Mentored aspiring software engineers [nodeschool.io] and entrepreneurs [growni.sk].
Contact
Motivation
It matters to me that ideas and opinions get heard, and that the work is actually useful to someone. A clear goal helps, it gives me something to work towards. So does having time to get better, and to help others get better. I like working with people who keep their promises and have skin in the game. And with transparency, because it's hard to trust what you can't see. A place where we can grow.
Time zones
Working remotely from the EU.
8AM EST is 2PM CET for me. That's 5-6 working hours of overlap.
8AM PST is 5PM CET for me. That's 2-4 working hours of overlap.
See more at worldtimebuddy.com.
Experience
NordVPN
VPN service that encrypts your internet traffic. Unicorn with 3B+ valuation and millions of users.
Senior Software Engineer
- Developed browser extensions for Chrome, Firefox and Edge
- By constantly improving the product, I have increased ratings in extension stores. This had direct effect on increase in subscriptions and revenue
- Mentored junior team members, helped them to grow their skills and knowledge, contributed to their professional development
- Conducted hiring interviews
- Improved DX, increased team productivity and streamlined our development workflow
- Participated in the design and UX process, provided feedback and suggestions that improved the overall product experience
- Communicated and collaborated with other teams, facilitated knowledge sharing and better alignment of goals
- Provided human code reviews for our and other teams
- Debugged many low level issues (e.g. proxy authentication - had to dig into source code of Chromium and Firefox)
- Fixed (and created) tons of bugs
- Helped set up our automated QA
- Improved loading times and performance
- Prototyped internal test and labs projects, closely collaborated with R&D team
Seasy
Discover, book, and experience over 1,500+ sailing destinations across the globe. You can book marinas from the comfort of your yacht.
Tech Co-Founder
- As a tech co-founder, I’ve basically built the whole thing
- We have received 7-digit investment and generated revenue
- Had a chance to hire and work with some great people
- We have made our customers lives easier and safer
- Designed and implemented architecture for services such User, Search and Discovery, Booking, Messaging, Reviews, Notifications, Managing, Support, Backoffice, Payments, Refunds
- React Native (Expo) apps
- SEO focused React SSR frontend
- Federated Apollo GraphQL server with Postgres
- Sometimes I took role of customer support to learn more about our stakeholders journey and experience
Erste Bank
George is white-label banking frontend for all banks acquired by Erste Bank. It is used by millions of people in Europe.
Senior Frontend Engineer
- Incremental refactoring of legacy codebase from Marionette/Backbone.js to React, Redux and TypeScript
- Implemented, improved and maintained several key features such as plugins, transactions, chat, import and export
- Took part in grooming of new features
- Improved application loading times and performance
- Performed regular code reviews for other developers
- Strong proponent of TDD, knowledge sharing and Bus factor
SaferPass
SaferPass is a password manager that securely stores, manages, and autofills passwords, passkeys, credit cards, notes and more.
Full-stack Software Engineer
- Implementing and maintaining sync of encrypted data across multiple devices
- Worked on automatic conflict resolution and upserting (not CRDT/automerge, but pouchdb)
- Handling edge cases such as merging encrypted data with devices that were offline for longer time, versioning encrypted data
- Developing browser extensions for 4 different browsers and build system to automate it
- Developing Android and iOS app
HomeCredit
Internal tools for insurance/loan projects.
Senior/Lead Frontend Engineer
- Designed and implemented single-spa/micro-frontends architecture
- Deployments to k8s via helm
- Mentored juniors
Treeti
Treeti is a streaming provider that offers a wide range of movies and TV shows in various genres and languages.
Full-stack Software Engineer
- Will add later...
IKEA Components
Custom knowledge base solution for local automated IKEA warehouse, specialising in the packaging and delivery of furniture accessories and parts. (Now decomissioned)
- Will add later...
Tech stack
Apps
browser extensions, electron, tauri, react-native, expo
Languages
typescript, javascript, sql, python, cpp, go
Frontend
react, vite, tailwind, relay-gql, next.js, redux, vue, zustand, jquery
Backend
node.js, express, graphql, trpc, orpc, openapi, websocket, mqtt
Database
postgresql, mongodb, supabase, firebase, redis, sqlite, cloudflare d1
DevOps
docker, kubernetes/helm, netlify, aws, gcp, firebase, cloudflare
QA / Testing
human code reviews, playwright, puppeteer, jest, fuck around -> find out (scientific method), fuzzing, defensive programming
Tools
llms, ai agents, rag
Writing
Certs
