Blockchain Payments Lead Engineer

• Own the end-to-end payment orchestration for major bank rails (ACH/RTP/FedNow/SEPA/Open Banking) and cards (including Apple Pay/Google Pay).
  
• Design and implement idempotent fault-tolerant APIs and robust webhook processing systems.
  
• Integrate and manage third-party providers for connectivity (Plaid/TrueLayer/Tink) card processing (Stripe/ and on-chain risk/compliance (Chainalysis/TRM Travel Rule networks).
  

• Build and scale a real-time risk engine ($le 300$ms) combining ML scores rules device signals sanctions/KYC hits payment intelligence and blockchain analytics to yield fast GREEN/AMBER/RED outcomes.
  
• Implement foundational KYC/AML primitives (CIP/CDD sanctions/PEP screening Travel Rule data plumbing) in close partnership with our Compliance team ensuring audit-ready decision journaling.
  

• Ship a double-entry ledger and automated reconciliation jobs that accurately tie together processors bank statements and on-chain balances.
  
• Develop daily break detection and automated remediation workflows to maintain financial integrity.
  

• Ensure safe and rapid crypto delivery (e.g. USDC/SOL) to user wallets by managing hot-wallet flows transaction creation confirmations and operational safeguards.
  

• Set the bar for reliability: implement SLOs circuit breakers retries/backoffs dead-letter queues shadow traffic and canary releases for all high-risk financial flows.
  
• Instrument everything with traces metrics and logs. Build internal ops & compliance dashboards and participate in the production on-call rotation for our 24/7 system.
  

• Work closely with Product Mobile Compliance Risk and Finance teams driving features from initial concept through production deployment and iteration.
  

Requirements

• Fiat Onramp Expertise: Proven experience building fiat ramps end-to-end.
  
• System Design & Scale: Deep experience in high-throughput low-latency distributed systems payments or fintech risk platforms.
  
• Language Fluency: Fluent in one or more systems languages (Rust Go) or strong systems chops in TypeScript/Node/Python.
  
• Database Mastery: Expert-level knowledge of Postgres (transactions indexing locking) with familiarity in Redis and event/OLAP stores (Kafka/Redpanda ClickHouse).
  
• API Craftsmanship: Mastery of gRPC/REST best practices including versioning pagination authN/Z idempotency keys and building rock-solid webhook consumers.
  
• Event-Driven Design: Experience designing systems with queues outbox/inbox patterns Sagas and ensuring exactly-once-effective behavior.
  
• Security Mindset: Practical experience with key management basics HSM/KMS usage secrets hygiene least privilege data minimization and auditability.
  
• Ownership & Ambiguity: Ownership-driven and comfortable operating in high-ambiguity environmentsyou move quickly measure results and iterate.
  

Benefits

• Contract : Permanent role (on-site/in-person) in London (UK).
  
• Work essentials: MacBook Pro iPhone AirPods screens headsets AirPods and cables are provided on Day 1 .
  
• Training and coursework in Crypto Blockchain Security code Coding languages and other topics are paid for on-demand to encourage personal and professional growth.
  
• Events: fully funded attendance at fintech blockchain or related conferences.
  
• Teams retreats/meetups/seminars/conferences all around the world to get to meet in-person and foster meaningful connections.
  
• Benefits: healthcare and life insurance retirement plan sponsored transportation gym lunch card home office equipment and other perks.
  

• Recruiter / HR Call
  
• Technical Interview
  
• Technical Interview
  
• Final Interview