Andrzej Broński
Senior Software Engineer
Developer with 4+ years of professional Rust experience – fascinated by crypto and building fast, reliable systems.
Make it work • Make it right • Make it fast
Kraków, Poland (UTC+2)
Proof of excellence
Experience
OneBalance
Protocol Engineer
Malda.xyz
Lead ZK Engineer
- Took ownership of a ZK-based cross-chain sequencer project, driving it to mainnet readiness.
Key results:
- Introduced full zkVM guest reproducibility by nixifying Risc0 – malda/risc0pkgs.
- Dockerized RPC infrastructure for Ethereum, Linea, Base, and Optimism – malda/atlas.
- Implemented Linea block verifier for their new consensus model – malda/linea-header-verifier.
- Established full CI pipeline for the Malda coprocessor codebase: format checks, linting, tests, and reproducible builds.
Gevulot / ZkCloud
Senior Software Engineer
Aug 2024
–
Nov 2025
Helsinki, Finland · Remote
Dropped ZK proving · pivoted to Zenith (Canton)
- Benchmarking and integrating external ZK provers; writing custom orchestration.
- Working on Ethereum real-time proving.
Key results:
- In the first month, won “Aztec Decentralization Contest”, in both categories (US $20,000).
- Eliminated a bottleneck in Ethereum proving: reduced input preparation from ~4 minutes to 2 seconds, and open sourced solution.
- Achieved Ethereum real-time proving with a cluster of 48× RTX 4090 and ZisK zkVM, live-tested at Devconnect Argentina (Nov 2025).
Casper Network
R&D Engineer
Jan 2023
–
Jul 2024
Zug, Switzerland · Remote
No traction · token down >95% since 2023
- Building a dedicated L2 for processing payments, using zero-knowledge technology.
- Assessing grant deliverables.
- Representing the company at public events.
Key results:
- Designed L2 system ‘Kairos’ and implemented its core parts: ASN.1-based schema, cryptography, L1 synchronization.
- Created blockchain library for handling events: Casper Event Toolkit.
- Reviewed 30+ grant projects and recommended cancellation for many due to grant farming.
- Performed public speeches: ~ ‘Web3 vs Web2 development’ – Lubelskie Dni Informatyki, university at Lublin. ~ ‘How to quickly start building on Casper?’ – Cryptosphere conference in Wrocław. ~ ‘Dynamic NFTs’ – Web3 Berlin conference.
Next on p. 2 ⟶ JumpWire, Founding Engineer
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