Backend Engineer Jobs - April 2025

I'm Max, co-founder and CTO of Langfuse (YC W23) - we're building open source LLMOps dev tooling. We started with observability and have branched out into more workflows over time (evals, prompt mgmt, playground, testing...). We have a bunch of traction and a…

RevEng.AI is building foundational AI models to identify malicious threats and security vulnerabilities inside software at the binary level. We’re a seed stage startup having raised $4.25m from top tier VCs across the US and Europe. You’ll play a key role in …

Exa is a search engine built for AIs. We enable developers to filter the internet's content with complex queries in order to bring the world's knowledge into their AI apps.

Cactus is a strategy, design, and engineering firm that builds physical and digital products for some of the world's leading healthcare clinics. Fully remote with teams based in the US and Brazil, we’re hiring for a variety of software engineering roles.

We provide isolated runtimes for executing untrusted code, mostly generated by LLMs. Our sandboxing is powered by a combination of WebAssembly, V8, and microVMs. Our customers do things like extract data from log lines at run time by asking claude-3-7-sonnet …

Buildings account for ~40% of all emissions. There is a ton of federal, state, and local programs to help decarbonize buildings -- but this money is difficult to access, trapped behind complicated program requirements, uncertain eligibility, lack of clarity, …