Staff Backend Engineer | Modulate
Role: Staff Backend Engineer
Company: Modulate
Location: Cambridge/Boston, MA, USA. Hybrid, 3 days a week in the office. You need to be US-local. Exceptions are possible for exceptional candidates.
Job Type: Full-time
About Modulate
Modulate is a voice AI infrastructure company at Series A. It started in gaming, with a goal of making online play equitable and less toxic. Its ToxMod system moderates voice chat in Call of Duty, and Rainbow Six Siege cut critical toxic voice chat by 50% with it. Today the company is moving into fraud prevention, customer service and oversight of AI voice agents. Its Velma platform runs an ensemble of 100+ small specialised models, and the Velma model has been open to any developer through an API since June 2026.
Engineering here works in an unusual way. Engineers use agents for all coding, and they work highly independently. The codebase is under 100K lines and growing fast. CI/CD is agentic: one agent writes the code, an adversarial agent reviews the MR, and the two negotiate approval. A human gives the final sign-off.
It seems to work. The latest security audit had
