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Bespoke Labs
RL environments and infrastructure for training reliable long-horizon AI agents
Last verified August 17, 2026 · Updated daily
What Bespoke Labs is building
Bespoke Labs builds the reinforcement learning environments and surrounding infrastructure that frontier labs and enterprises use to train, evaluate, and improve long-horizon AI agents. Today's agents handle short tasks but fall apart over hours or days of autonomous work; to fix that, they need realistic environments to practice in and be measured against. Bespoke builds those environments with research techniques developed alongside the academic and open-source community, then helps customers measure and improve agents using methods like GEPA (Genetic-Pareto Agent Optimizer), which automates prompt and policy search. The team's open-research footprint is unusual for its size: core contributor to Terminal-Bench, one of the most cited agentic benchmarks, and creator of OpenThoughts, an open reasoning dataset downloaded more than 500,000 times and used by groups including Thinking Machines Lab, Meta, and Amazon.
Why this matters
RL environments are becoming the picks-and-shovels layer of the agent era: every lab and AI-native enterprise pushing long-horizon capability needs them, and most competitors staff the problem with contractors building shallow app-level simulations. Bespoke's bet is that environments are a research problem, not a data-labeling problem — and the syndicate suggests sophisticated buyers agree: Wing led the A, 8VC led the seed, and the angel list includes Jeff Dean plus operators from Anthropic, OpenAI, and Meta. Wing's Peter Wagner framed the thesis as a new generation of data and training infrastructure being required as labs push long-horizon agents. Founded in 2024 by CEO Mahesh Sathiamoorthy and Chief Science Officer Alex Dimakis (a UC Berkeley professor), the company already has real distribution through its open-source work, which functions as both credibility and inbound pipeline.
Open roles at Bespoke Labs
3 positions we're tracking. Roles are re-checked daily and removed when filled.
Know when Bespoke Labs is hiring before anyone else
A role stays uncontested for about four days. Here's the window — and where we put you in it.
From $9/month, cancel any time.
Watching Bespoke Labs
0 applicantsRole spotted & verified
1You get the alert
1You've applied
~8Hits the job boards
250+Hiring outlook
The stated use of funds is expanding the research team and scaling environment-building infrastructure — that is a hiring plan, not a vague growth line. This is a research lab that pointedly staffs research scientists and engineers rather than contractors and project managers, so hiring will be deliberate, high-bar, and founder-driven. RL-environment talent is scarce and this raise exists to compete for it.
Working at Bespoke Labs
Founded in 2024, Bespoke Labs is RL environments and infrastructure for training reliable long-horizon AI agents. They're now people. For a AI company this size, the reality is opportunity to shape your role based on the company stage.
The majority of roles are in Mountain View.
How to actually get hired at Bespoke Labs
Why applying the normal way doesn't work
Bespoke Labs runs an applicant tracking system, but hiring managers still work referrals first. A cold application to Bespoke Labs isn't dead, it's just fourth in line behind internal referrals, sourced candidates and recruiter pipelines.
Who to contact at Bespoke Labs
What to show them
Shipped RL training or eval infrastructure — environment harnesses, reward pipelines, or agent benchmarks. Open-source contributions to eval/agent tooling carry real weight with this team given their Terminal-Bench and OpenThoughts footprint. Core skills: RL post-training, distributed training infra, Python systems engineering, evals.
A cold email that works at Bespoke Labs
What Bespoke Labs screens for
The seed round was never announced — this $40M reveal compresses two rounds into one moment, meaning the team has been quietly building with 8VC and Jeff Dean's backing and is only now opening up. Research labs that announce funding with an explicit research-hiring mandate are the highest-leverage cold-outreach targets in AI right now.
A tailored CV beats a generic one. Use Bespoke Labs's job description language to clear filters.
Don't make these mistakes
Don't pitch generic 'AI agent' enthusiasm or prompt-engineering side projects — this team publishes benchmarks and datasets the field actually uses, and they explicitly define themselves against contractor-grade work. If you can't speak to RL, evals, or systems research concretely, this isn't your drop.
Mistakes that kill Bespoke Labs applications
Generic CVs stand out at a -person company — and not in a good way. Fastest path to rejection.
Skip 'I'm looking for...' — start with RL environments are becoming the picks-and-shovels layer of the agent era: every lab and AI-native enterprise pushing long-horizon capability needs them, and most competitors staff the problem with contractors building shallow app-level simulations and your specific angle on solving it.
The wait-and-hope strategy fails. Follow up on day five — response rates roughly double.
Applying to Bespoke Labs? Get the contact, not the form.
The Bespoke Labs interview process
4 stages · 14 days typical · take-home: yes · modelled from similar companies
We don't yet have verified candidate reports for Bespoke Labs. What follows is the typical process for a -person AI company — treat it as a model, not confirmed detail.
Interview stages
Recruiter Screen
Phone or video · 30 min
Basic qualification and logistics
Recruiter or HR
Hiring Manager Interview
Video call · 45 min
Role fit and experience deep-dive
Hiring manager
Technical/Functional Round
Video call · 60 min
Skills assessment and problem-solving
Team members
Final Round
In-person or video · 60 min
Culture fit and cross-functional alignment
Senior leadership
Bespoke Labs take-home assignment
Bespoke Labs includes a take-home exercise in their interview process. For AI roles, this typically involves a practical problem that takes 2-4 hours. Focus on clean, working code over premature optimization. They're evaluating how you think and communicate, not just the solution.
Bespoke Labs interview timeline
Expect days total. Compared to similar AI companies (14 days median), Bespoke Labs is about average.
Interviewed at Bespoke Labs?
Tell us how it went — stages, questions, timeline. Takes 90 seconds and it's how this page stays accurate for the next person.
Submit your Bespoke Labs interview experience →Bespoke Labs jobs, frequently asked questions
How many jobs does Bespoke Labs have open?
As of July 2026, Bespoke Labs has 3 open positions.
Does Bespoke Labs hire remotely?
Bespoke Labs doesn't have remote openings at the moment. All roles are in Mountain View.
What roles is Bespoke Labs hiring for?
Bespoke Labs is hiring across Engineering, Data. The most recent opening is Research Engineer (RL).
How do I apply for a job at Bespoke Labs?
Apply via the links above. For tips, read our guide on how to get hired at Bespoke Labs.
Does Bespoke Labs respond to cold emails?
Response rate data for Bespoke Labs not yet confirmed.
Who is the hiring manager at Bespoke Labs?
At this size, hiring is usually run by the hiring manager.
How competitive is it to get hired at Bespoke Labs?
Expect 100-250 applicants in the first two weeks for AI roles at this size. Apply within 72 hours for best odds.
How many rounds is the Bespoke Labs interview?
4 stages: Recruiter Screen, Hiring Manager Interview, Technical/Functional Round, Final Round.
Is the Bespoke Labs interview hard?
Expect technical depth and system design, not algorithm trivia. Candidates report Technical Interview as the toughest stage.
Does Bespoke Labs give a take-home task?
Yes, Bespoke Labs includes a take-home assignment.
How long does Bespoke Labs take to get back to you?
Around 14 days across the full process.
What should I prepare for the Bespoke Labs interview?
technical depth and system design is the priority. Show you can work autonomously — that matters more than algorithms at people.
Where is Bespoke Labs based?
Bespoke Labs is headquartered in Mountain View.
Get Bespoke Labs roles before they're posted
A role stays uncontested for about four days. Here's the window — and where we put you in it.
From $9/month, cancel any time.
Watching Bespoke Labs
0 applicantsRole spotted & verified
1You get the alert
1You've applied
~8Hits the job boards
250+