[Hiring] Software Engineer @Griffin

Role Description

Right now, we're building card issuing from scratch, going direct on Faster Payments, enabling cross-border payments, and building term deposit accounts. Day to day, this means:

• Writing the reconciliation systems that process millions of FPS transactions
• Implementing double-entry accounting that tracks card spending and settlements
• Designing webhook infrastructure with message signing and replay protection
• Building API versioning that lets us evolve without breaking customers
• Creating payment approval workflows that satisfy both user experience and compliance requirements

What success looks like

Success here is about impact beyond your own code: improving how we work, making other engineers more productive, and building systems that our customers (other developers) actually want to use. This looks like:

• Redesigning the transaction reconciliation service to handle 10x throughput before we hit FPS volume limits
• Fixing the root cause of webhook delivery failures so we stop getting paged at 3am
• Building a Bazel rule that cuts build times in half for the whole team
• Writing an RFC that becomes the pattern we use for all event-driven services
• Pairing with another engineer to help them reason through FoundationDB transaction semantics
• Owning card issuing from initial RFC through to processing the first live transaction - making every architecture and implementation decision along the way

What you'll own

• The technical decisions on your projects - you'll write the RFCs, choose the architecture, and decide when to extend existing systems versus rebuild them
• Delivery from customer problem to live feature - you'll work with PMs to shape what gets built, then own getting it into production
• Setting technical direction - your code reviews, implementation patterns, and architectural choices influence how the wider team builds software
• Production responsibility - the systems you build are yours to monitor, debug, and improve when issues arise

Qualifications

• Functional programming experience - you've shipped production Clojure, Elixir, Erlang, Haskell, Scala, or Scheme in a professional setting, or you've built substantial personal projects that demonstrate deep functional programming experience
• Fintech domain expertise - you've worked in payments, accounts, ledgers, or compliance where you've dealt with money movement, reconciliation, and regulatory requirements
• Strong software fundamentals and distributed systems knowledge - you understand consistency models, idempotency, and the failure modes that actually matter in production
• Experience working in product-focused, collaborative teams - you've shaped what gets built alongside PMs and designers, not just implemented specs
• Comfort with startup pace and ambiguity - priorities shift, requirements evolve, and you adapt without needing perfect clarity upfront

Benefits

• Remote-first flexibility: Work from anywhere in the UK
• Time off: 25 days’ holiday, bank holidays and a winter break (we shut down between Christmas and New Year)
• Share options: Own a part of what we’re building together
• Work from abroad: Up to 20 days a year
• Pension: Auto-enrolment into our Penfold scheme
• Insurance: Private medical with Bupa (including family cover) and life insurance with AIG
• Wellbeing: 1:1 coaching and therapy session available through Oliva
• Family leave: Enhanced parental leave with up to 6 months on full pay after two years’ service
• AI tools: Everyone has a Claude subscription on us and access to other premium tools
• Your setup: We’ll support you in creating a comfortable and effective WFH environment