Software Engineer (Fintech)

TL;DR

Software Engineer (Fintech): Building card issuing and enabling cross-border payments with an accent on reconciliation systems, double-entry accounting, and webhook infrastructure. Focus on designing API versioning, implementing payment approval workflows, and satisfying both user experience and compliance requirements.

Location: London or remote within the UK

Company

Griffin is the bank for companies who want to build and launch financial products.

What you will do

• Write the reconciliation systems that process millions of FPS transactions.
• Implement double-entry accounting that tracks card spending and settlements.
• Design webhook infrastructure with message signing and replay protection.
• Build API versioning that lets us evolve without breaking customers.
• Create payment approval workflows that satisfy both user experience and compliance requirements.
• Setting technical direction - your code reviews, implementation patterns, and architectural choices influence how the wider team builds software.

Requirements

• Experience with functional programming languages such as Clojure, Elixir, Erlang, Haskell, Scala, or Scheme.
• Experience in payments, accounts, ledgers, or compliance, dealing with money movement, reconciliation, and regulatory requirements.
• Strong software fundamentals and distributed systems knowledge.
• Experience working in product-focused, collaborative teams.
• Comfort with startup pace and ambiguity.

Culture & Benefits

• Remote-first flexibility: Work from anywhere in the UK.
• 25 days’ holiday, bank holidays and a winter break.
• Share options.
• Up to 20 days a year to work from abroad.
• Private medical with Bupa (including family cover) and life insurance with AIG.

Hiring process

• Initial phone call with the Talent Team.
• A task based on what you’ll be doing on a day to day at Griffin.
• Meet your manager and peers for technical interviews.
• Culture and Founder interview.