Argument-0005: Retention at Rank 3

Report Date	Date of submission (2026/10/02)
Submitted by	Jan Bujak

Member details

• Matrix username: @jan:parity.io
• Polkadot address: 15tRXfXoZXkjScB3Awv8s2saPjaicKYAyL1WZ3JP5kycoG9n
• Current rank: 3
• Date of initial induction: seeding
• Date of last report: 2026/02/13
• Area(s) of Expertise/Interest: JAM, PolkaVM, virtual machines, WebAssembly, performance, compilers and toolchains

Reporting period

• Start date: 2026/02/13
• End date: 2026/10/02

Argument

Most of my time has been spent on JAM and PolkaVM-related activities. Here are some of the highlights:

• Gray Paper PRs and related research: new gas cost model (finally merged), compile hostcalls, code blob format rework (cuts down program blob sizes by ~10% and opens the door to lazy recompilation), working set (last major missing piece of the gas cost model, making memory paging also gas metered)
• 6 major PolkaVM releases, with numerous fixes and improvements, including but not limited to prototyping functionality that was later proposed for inclusion into the Gray Paper, for example the code blob format rework
• Taking part in JAM Prize interviews (15 interviews so far), mostly judging candidates' PVM knowledge

Currently I'm focusing on getting the remaining PVM-related pieces merged in the Gray Paper and implemented in PolkaVM, as well as helping get JAM to 1.0

Voting record

Ranks	Activity thresholds	Agreement thresholds	Member's voting activities	Comments
III	70%	100%	Participation rate: 45.88%, agreement rate: 100%

Unfortunately my participation rate dropped compared to the last retention period and I don't have a good excuse. I'll try to do better.