Do you want to be at the forefront of the blockchain ecosystem, building the next generation of platforms and tooling to widen the adoption of blockchain technology, and assist forward-thinking enterprises with their blockchain journey?

We’re growing the core blk.io team to enhance our enterprise blockchain offerings.

About us

We're a bootstrapped, cashflow positive blockchain business based in Old Street. Our customers include the biggest names in tech, and we need to grow!

We’re no stranger to the open source being responsible for the web3j group of projects and contributors to other projects in the Ethereum ecosystem.

Not only are we working with all the latest and greatest technology, we are also forming significant partnerships with other leaders in this space to create the best platform.

You can also read about some of the things we've been doing on our blog.

About you

Right now most of our work is on the Java Virtual Machine, and we’re looking for Java or Kotlin developers to join us. It’s certainly preferred if you understand Ethereum blockchain technology and Solidity, but not essential as we’ll teach you all about it.

We’re also working with a number of other technologies including:

  • JavaScript/React
  • Docker
  • Haskell
  • Go
  • Azure/AWS
  • Spring Boot and the wider Spring Ecosystem
  • AQMP
  • ReactiveX


It certainly helps if you’ve got experience with them too. Also being a startup, we'd want you to be comfortable working in an agile environment, using Kanban, Lean, etc.


Other stuff

We’re based in the heart of London's tech scene in Old Street.

If this captures your imagination, please get in touch. We need to see evidence of projects you’ve done before, preferably on GitHub. But if your work isn’t public you can always come and talk us through it.