Heads up: this job position has expired. If you were already in process, no worries; it will still proceed as normal.

Senior Full-stack Engineer

Fractal Blockchain
Creating a Decentralized Future

Job details

Apply now


Fractal builds critical web applications and services for enabling, monitoring and reconciling financial transactions using blockchain technology. We’re working with ICOs, exploring the identity space, and looking forward to open-sourcing financial technology, which is desperately lacking appropriate and inclusive international standards.

Fractal’s 6-strong engineering team is known for its sky-high standards and aspirations. Software is hard, and we know it takes curiosity, passion, discipline, and patience to get it right.

Your Profile

There's a specific kind of person we're looking for. We understand we’re describing a rare breed, so it’s ok if you don’t meet all these requirements.

  • You consider yourself a senior software engineer, and so do all of you peers.
  • You understand that “move fast and break things” is only a good philosophy when what you build is inconsequential.
  • You're excited to break out of an application's code and think about the system as a whole (tweaking nginx configs, thinking about load balancers, worrying about queues and their throughput).
  • You're the person your friends turn to when they hear about that new tech in Hacker News. They do that because you’re up to speed with the current trends and great at breaking down complex technology in a way that your juniors can grasp.
  • Someone at our team has done mutation testing by hand because they’re that careful about things. You don’t think this is crazy, and maybe have done the same yourself.
  • You get really angry if someone tries to takes away your agile, or your tests, or your continuous delivery, or.... You get the point.

Our values

It’s always difficult to accurately write about one’s values in a way that captures their subtlety, but here's a decent start. We can chat more about it during the application process.

  • Gather great talent: Have the best peers you could ask for, people you can continuously teach and learn with. We know A-players want to work with other A-players.
  • Enforce transparency: Every decision's process is documented in the clear, all information is available to everyone (to the extent of the law).
  • Include everyone: Consider all ideas from anyone. Even if it isn't your area of expertise, we encourage you to ask questions and contribute in any way you feel inclined.
  • Don't worry about salaries: We want our engineers thinking about code, not money. All engineers get paid enough to live a comfortable lifestyle.
  • Promote authenticity: We have an informal environment, and we believe getting along well is fundamental. Everyone's different and we're going to spend a third of our lives together, so we make sure everyone feels welcome.

Main requirements

  • You've built at least a handful of websites by now, of which at least one really challenged your software design skills and dealt with more than 10 concurrent users

  • DFA, BFS, DFS, A: these are not just words for you. You might not be totally in the know, but you'd know where to start. You can reason about algorithmic complexity and know which trade-offs to make

  • Your education and years of experience don’t matter but, when we speak, we need to feel like you’ve been doing this forever.
  • We build our web applications mostly in Ruby/Rails for the back-end and JavaScript/React for the front-end. We also have a bunch of services running Go. Our infra is docker-containerized and sits on AWS (Fargate/ECS and RDS PostgreSQL) and is managed through Terraform. We work with Bitcoin, Ethereum (and Solidity), and Lisk.

Nice to have

  • Understanding of blockchain technology, distributed systems, and cryptography.


  • Remote work, flexible hours, world-class engineering team

Apply now