The Role
Agents work faster, cheaper and more reliably when they write code instead of making one tool call at a time. That code needs somewhere safe to run. Monty is our answer: a Python interpreter written from scratch in Rust, where code can only reach the files, network and environment you explicitly grant it, that starts in under a millisecond and can be paused, dumped to bytes and resumed later. Our managed agent sandboxes run it as a service.
You'll be the product owner and team lead for agent sandboxes. You own the interpreter, the service and the roadmap: whether it is secure, whether it is fast, whether it stays up, and what gets built next. You'll talk to customers, decide what matters, build it with coding agents, and run it in production.
What We're Looking For
Owners
You run what you build. You've deployed services, set their reliability targets and been on call for them. Kubernetes, object storage and Postgres are familiar ground, and you'd rather own a system end to end than hand it off.
Paranoid About Untrusted Code
Every change you review starts with one question: what can sandboxed code do now that it couldn't before? You know the ways a sandbox breaks, from memory bugs to resource exhaustion to a compromised dependency, and you build fuzzers and differential tests to find them before anyone else does.
Agent-Driven
Most of Monty's code is written by coding agents. You direct them as your main way of producing software, you build the tests, oracles and lints that keep them honest, and you stay responsible for every line they ship.
Product-Minded
You can sit with a customer, work out what they actually need, and say no to what isn't worth building.
What You'll Build
- A multi-tenant sandbox service that customers depend on in production
- The interpreter features agent-written code needs, and the performance work to make them fast
- Systematic ways to challenge and check the sandbox's security
- The wire protocol, the Python, TypeScript and WebAssembly bindings, and the docs and examples that show developers what Monty makes possible
Requirements
- Deep Rust experience. If you don't have a rough idea of the difference between
BoxandArc, this probably isn't the right job for you. - A track record of owning production services: reliability, observability and on-call.
- Experience leading technical work and making product calls, not only implementing them.
- Working knowledge of Python, enough to know or find out what CPython does.
- At least 5 years of software engineering experience.
Nice to have: interpreters, compilers, VMs or JITs; Firecracker, gVisor, V8 isolates or WebAssembly runtimes; OpenTelemetry; open source Rust contributions. Nobody has all of it. Tell us which parts you'd grow into.
Non-Technical Requirements
- Live and work in a timezone between PT (UTC-8) and CET (UTC+1)
- Able to travel to EU, UK and US up to 4 times a year to join our off-sites
- Willing to join our on-call rotation, roughly 1 week in every 10
About Us
Pydantic Validation is the data validation library that powers modern Python development - 500 million downloads per month, used by virtually every tech company you've heard of. Why? Because we obsess over developer experience and write code we'd actually want to use ourselves.
We're applying that same engineering mindset to Pydantic Logfire, our observability platform with first class support for AI engineering, built for today's development reality: AI workloads, multi-language environments, and cloud infrastructure that's designed to be straightforward to set up and maintain.
We build with technologies developers actually want to work with:
- OpenTelemetry for standardized instrumentation
- SQL for intuitive querying (no proprietary query language to learn)
- Rust, Python, and TypeScript for performance and productivity
- Postgres, DataFusion, and object storage for scalable backends
Unlike other companies that pay lip service to open source, we commit over 20% of our engineering team to maintaining and expanding our open source ecosystem. This includes the core Pydantic Validation library and Pydantic AI - our rapidly growing framework that's becoming the standard for AI application development. We're signatories of the open source pledge and build on open standards because we believe in interoperability, not lock-in. Use our OpenTelemetry-based SDK with any compatible backend - we're confident you'll choose us on merit.
We're backed by Sequoia Capital and run a fully remote team across multiple time zones, with regular in-person offsites.
Join our team of exceptional engineers who value substance over hype, practical approaches over perfectionism, and meaningful progress over busyness. We've built a culture that balances technical ambition with sustainable practices—minimal meetings and respect for your expertise and time. We're creating tools that genuinely improve developers' lives, and we're looking for thoughtful contributors who share our commitment to quality and our passion for elegant solutions.
Perks & Benefits
- 💰 Compensation: Competitive salary and stock options
- 🌍 Truly Remote: Work from anywhere within our timezone range - no office requirements
- 🌐 Global & Diverse: Join a multi-cultural team of 8+ nationalities
- 💪 Impact: Direct influence on tools used by millions of developers worldwide
- 🎯 Focus on Growth: Regular opportunities for learning and professional development
- 🤝 Team Gatherings: Connect with the team at our regular international off-sites
- 🏥 Healthcare: Comprehensive health coverage for you and your dependents
- 🎮 Flexible Hours: Work when you're most productive
- 💻 Equipment: Budget for your home office setup
- ⚖️ Work-Life Balance: flexible working hours and 33 days PTO no matter where you live (including public holidays, which you can choose to take or not)