Bartosz Rybarski · Personal blog

Hi! I’m Bartosz. I’m a software engineer passionate about financial markets and blockchain. I strive to combine the highest engineering standards with a business-oriented mindset.

🏫 Education

MSc Software Engineering and Internet Computing

Technical University of Vienna
2024-now, Vienna

Focus areas: distributed systems, multiprocessor programming, and cryptography. I’m writing my master’s thesis in the area of zero-knowledge proofs.

BSc Computer Science

University of Warsaw
2019-2023, Warsaw

One of Poland’s leading computer science faculties, with strong collaborations with companies such as Nvidia, Google, Jane Street, and Susquehanna.

🏢 Work experience

Software Mansion - 3 years

2021-2024, Cracow/Remote

Software Mansion is a well-regarded, publicly listed consultancy, especially known for its vast contribution and presence in the React Native community.

Technologies: React Native (TypeScript/JavaScript), C++, Python, Swift, Kotlin

Selected projects:

Amazon - Vega OS

Ported major React Native and Expo packages to the new Vega OS platform.
Developed platform-specific modules in C++ and TypeScript.
Worked on improving reliability and performance of RN integrations on amazon devices.

Starkware - StarkNet blockchain developer tooling

Blockchain scaling startup. I worked on building developer tools around the Starknet blockchain. The ones I contributed to the most are:
- starknet.swift: Starknet SDK for Swift
- starknet-jvm: Kotlin/JVM SDK
- starknet-foundry: Rust-based smart contract development and testing toolkit.
Collaborated with Starkware engineers on API design, developer UX, and tooling workflows.

Mos.com - Banking app for students

Developed and maintained core features of the mobile app for a student-focused US neobank.
We made it to the third place in the US AppStore charts!

Visla.co - 1 year

2020-2021, Warsaw

Built a time-management mobile application for teams using React Native.

🎓 Student clubs

WUTIS - Algorithmic Trading Analyst

Participated in workshops on quantitative engineering, financial modeling, and data analysis.

Semester project:

Developing a prediction-market arbitrage bot that aggregates events from platforms like Polymarket and Kalshi
Uses NLP to match equivalent events across platforms
Continuously monitors and executes arbitrage opportunities

🎤 Conferences and events

Speaker @ ETH Warsaw 2022

Led workshops introducing developers to the Starknet ecosystem and the Cairo programming language.

Blockchain 101 Workshops @ Software Mansion

Co-organized and delivered workshops explaining Bitcoin internals, including hands-on exercises building a simple cryptocurrency in Python.

Starknet Hackathon Amsterdam 2022

Our team from Software Mansion took part in the hackathon, where we built a web-native wallet for Starknet.

AIM Agentic AI Hackathon 2025

Developed trivia-answering agent capable of retrieving data from PDFs, querying SQL databases, and searching Wikipedia using LLMs, vector databases, and contextual retrieval.