# Argument-0005: Retention at Rank 3
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| --------------- | ------------------------------------------------------------------------------------------- |
| **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](https://github.com/gavofyork/graypaper/pull/508) (finally merged), [compile hostcalls](https://github.com/gavofyork/graypaper/pull/530), [code blob format rework](https://github.com/gavofyork/graypaper/pull/555) (cuts down program blob sizes by ~10% and opens the door to lazy recompilation), [working set](https://github.com/gavofyork/graypaper/pull/531) (last major missing piece of the gas cost model, making memory paging also gas metered)
  - 6 major PolkaVM releases, with [numerous fixes and improvements](https://github.com/paritytech/polkavm/commits/master/), including but not limited to prototyping functionality that was later proposed for inclusion into the Gray Paper, for example [the code blob format rework](https://github.com/paritytech/polkavm/commit/143d6d57b1fc601b99952acb02fcebe9b81d5208)
  - 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.