# EPF6 Dev Updates – Week 10

This week I explored multiple workarounds for fixing optional ssz type needed for the type `EpochBackfillState` and finally resolved based on the comments from nico(from lodestar team).

I also wrote unit tests for the BackfillState repository. The tests passed when I tried running them locally tweaking some vitest configs.

Currently I'm working on primary backfill class and how to make it compatible with worker threads.
Revisiting Backfill Class, how the asynchronous control flow is handled using triggers, how the complete flow proceeds and other implementation specifics.
Awaiting some inputs from my mentor and simultaneously working on pr for the same.

Week 11 goals:
---
- Draft the pr for backfill class
- Start working on next subtasks:
* Management of peers that requests can be made to
* Structuring and making ReqResp requests and validating responses