Ahrefs is looking for a backend developer with deep understanding of networks, distributed systems, OS fundamentals and taste for simple and efficient architectural designs. Our backend is mostly implemented in OCaml with some C++.
In this role, be prepared to deal with 25 petabytes of live data, OCaml and Linux on a daily basis.
These requirements stem naturally from our approach to development with fast feedback cycle, highly-focused personal areas of responsibility and strong tendency to vertical component splitting.
If your preference is leaning towards making the web functional and working on user-facing stuff, you may want to consider our ReasonML position instead.
We offer:
Ahrefs does not engage with agencies or third party recruitment solutions for the roles we hire for. If at any point we need help, we'll let you know!

Ahrefs is the marketing platform built to keep your brand discoverable across search, AI, and the web. Powered by 15 years of crawling the internet, we turn massive-scale data into insights you can act on – so you can see what people want, fix what holds you back, ship what wins, and track your growth.
- #1 most active web crawler in SEO, #2 worldwide (after Google)
- Trusted by marketers at 44% of the Fortune 500 to stay ahead in search and AI
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- 35T backlinks, 110B keywords, 320PB of data indexed