Jakub
Senior Software Engineer
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Book a 30 min callI'm Jakub, a Senior Software Engineer with 10+ years of professional IT experience, including 5+ years as a blockchain and smart contract engineer and 6 years working in Rust and Go. My specialization is decentralized finance, and I've designed and written several protocols with successful launches. I advocate for DeFi and FOSS, and I'm passionate about tech in all its forms. If you'd like to work with me, feel free to reach out.
Featured Projects
Phoenix DeFi Hub
In 2023, I co-founded a decentralized exchange on Stellar, built on the Soroban smart contract platform. I handled fundraising and grew the team to seven people. I wrote most of the core protocol myself - pools, factory, staking, deployment, and CI/CD. The DEX is now one of the biggest projects on Soroban, which, when we started, was still early in production and hadn't yet hit the mainnet.
WYND
A year earlier, in 2022, I led a team of four engineers under the mentorship of the founder of the CosmWasm smart contract framework. Together we successfully built and launched a multi-protocol DeFi suite on Juno using CosmWasm, including a DEX, liquid staking derivatives, lending, and other interesting features such as a gauge orchestrator, which let users vote on the protocol's liquid staking commitment using their staking tokens as voting power.
WAVS
More recently, since 2025, I've been a major contributor to a high-performance async Rust platform bridging Web2 and Web3 capabilities through decentralized event-driven Autonomous Verified Services. I built the aggregator engine, integrated early-stage WASI libraries like wasi-keyvalue, implemented per-block triggers that became core functionality of WAVS, and added observability with Prometheus and Jaeger.
Skills
Languages
Runtimes & VMs
Infrastructure
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Experience
- Major contributor to WAVS - an async Rust platform on tokio/hyper. Built the aggregator engine with concurrent execution and fuel tracking, implemented per-block triggers that became core platform functionality, integrated early-stage WASI libraries (wasi-keyvalue), added Prometheus metrics and Jaeger tracing, and maintained Docker/CI pipelines
- Contributed to wavs-tools including a service JSON visualizer and aggregator component
- Worked on wavs-at-protocol - AT Protocol integration for WAVS, handling deployment and operator configuration
- Implemented performant asynchronous Rust services for cross-chain communication
- Developed and deployed Solidity smart contracts for EVM integrations
- Worked on an intelligent delta-neutral trading vault performing automatic rebalances
- Designed a chain-restaking CosmWasm smart contract system - delegations, token staking, fan-in/fan-out flows, operators, and splitter modules
- Co-founded Phoenix DeFi Hub - a DEX on Soroban/Stellar. Built the entire protocol - pools, factory, staking, V2.0.0 migration, admin transition system, auto-staking, deployment scripts, and CI/CD
- Built Phoenix NFT Marketplace with auction support on Soroban, including SDK upgrades and CI coverage
- Developed soroban-multisig-contracts - multisig contract on Soroban with upgrade proposal mechanism
- Main developer of WHELP DEX on Coreum - created initial architecture, DEX utils library, factory/asset types, fee splitter, and staking
- Contributed to Shade Protocol on Secret Network - built lending protocol components including market contracts, credit agency, and SNIP20 token refactoring
- Performed security audits for various projects, including Pulsara (DEX on Coreum), Stride (ICA oracle and staking scaling factor CosmWasm contracts) and Palomachain (PalomaDEX) among others
- Core contributor to CosmWasm runtime - extended the full math types library (Uint, Decimal) with checked/saturating arithmetic, operator traits, const constructors, and upgraded the project to Rust edition 2021
- Core contributor to cw-plus and cw-multi-test - built staking and distribution module, added executor restrictions to cw3-flex multisig, fixed voting/threshold bugs, managed multiple releases including v1.0.1
- Core developer of TGrade Proof of Engagement blockchain - built payment distribution, voting mechanisms, reward distribution, and slashing queries
- Designed and built Isotonic - a lending/borrowing protocol for Osmosis. Implemented loan repayment with collateral, swap/withdraw optimization, and Osmosis oracle integration
- Led development of WYND - a multi-protocol DeFi suite on CosmWasm spanning DEX, Liquid Staking Derivatives, lending, and staking pools
- Developed multiple microservices written entirely in Rust as part of 5G Core in a small team
- Built services from the ground up communicating via RESTful APIs using hyper and tokio
- Deployed services on Kubernetes clusters using custom Helm charts
- Profiled code using criterion benchmarks, flamegraph, and callgrind; established CI pipelines and test coverage with kcov
- Developed embedded software for routers running Linux on MIPS architecture - fixed LED malfunctions, firmware update errors, and status reporting issues
- Contributed to migrating cloud server network from SUSE (kernel 3.0) to RHEL (kernel 3.10) with minimal service disruption
- Implemented feature components in C++11/14, maintained and refactored legacy C++98 codebase, delivered internal tooling
- Oversaw feature development and created low-level documentation for Transport Access Service in the LTE stack
- Implemented features for monolithic BTS software in C++
- Built a browser application for scalable documentation storage and search - AngularJS frontend with Django backend
- Developed automated web-crawling applications in Python; set up CI automation on Jenkins and GitLab
Education
Bachelor of Science, Computer Science
Specialization in Systems and Computer Networks
Faculty of Electronics, Wroclaw University of Science and Technology