Senior Backend Engineer, Golang | B2B AI Payments Start-Up | London | Hyrbid 1-3 Days | Up to £130,000 +Benefits & Equity

Company: Owen Thomas | B Corp™
Apply for the Senior Backend Engineer, Golang | B2B AI Payments Start-Up | London | Hyrbid 1-3 Days | Up to £130,000 +Benefits & Equity
Location: London
Job Description:

Senior Backend Engineer | B2B AI Payments Start-Up | London | Hyrbid 2 Days | Up to £130,000 +Benefits & Equity

We’re partnered with an AI 1st fintech building payments infrastructure for businesses. Not only have they achieved over 400% revenue growth year on year, but in the previous 12 months they have closed deals with over 150 new clients.

The company leverages state of the art technology to provide a faster, cheaper and more secure payments service to businesses, so the engineering is solid.

So far, they have kept the team lean, but are now looking to build out the squads to increase capacity to deliver more product for the customers.

Never used Golang before? Not a problem! The company are looking for engineers who have excellent problem solving skills – as they are AI native, language matters less.

What they do need, is people with proven Payments, Wallet, Fintech or Banking experience. So if you are working in the space, but want to get exposure to Golang,

What you’ll be doing

  • Building the backend services that move customer money from A to B
  • Building out distributed systems that prioritise performance.
  • Working on ledgers, settlement and integrations with banks and payment providers
  • Designing event-driven systems where correctness and uptime really matter
  • Owning your services from design to production
  • Work alongside Product, Compliance and Forward Deployed Engineers

What you’ll need

  • Strong backend experience in Go, or another systems language and a willingness to pick up Go
  • A background in payments, fintech or crypto
  • Experience with distributed, high-throughput systems
  • Comfort with AWS, databases and messaging
  • Strong experience using AI within your engineering.

Why it’s a good one

  • Proper ownership of critical systems
  • A real say in engineering standards as the company grows
  • Flexible working options of between 1-3 days per week in the office (They also have people around the UK but are wanting to build the team in London before expanding outwards)
  • Salary up to £130,000 with Benefits & Equity.

**Sadly the company can not support visa sponsorship at present**

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Posted: October 28th, 2026