Blockchain Payments Lead Engineer

The employer is a cryptocurrency launchpad for the Solana blockchain that enables users to create tokens and trade them immediately on the platform, as well as to launch them onto decentralized exchanges. With over 6 million meme coins launched on the platform, it is one of the fastest-growing crypto applications and one of the biggest drivers of the explosive growth in memecoins on the planet.

They are hiring a Blockchain Payments Lead Engineer

• Fiat Ramps in London (on-site/in person) MISSIONS As the Lead Blockchain Payments Engineer, you will be a core architect and owner of the essential financial infrastructure. You will design and scale the core services that power seamless fiat ↔ crypto flows, real-time risk decisions, and rock-solid financial records. Payment Orchestration & Integrations: Own the end-to-end payment orchestration for major bank rails (ACH/RTP/Fed. Now/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/True. Layer/Tink), card processing (Stripe/Checkout.com/Adyen), and on-chain risk/compliance (Chainalysis/TRM, Travel Rule networks). Real-Time Risk & Compliance: 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. Financial Integrity & Reconciliation: 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. Blockchain & Wallet Operations: Ensure safe and rapid crypto delivery (e.g., USDC/SOL) to user wallets by managing hot-wallet flows, transaction creation, confirmations, and operational safeguards. Reliability & Instrumentation: 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. Cross-Functional Collaboration: Work closely with Product, Mobile, Compliance, Risk, and Finance teams, driving features from initial concept through production deployment and iteration. STACK : Languages: Rust, Go, TypeScript/Node, Python Data Stores: Postgres, Redis, Click. House Messaging: Kafka/Redpanda, NATS API/IPC: gRPC/REST Infra: AWS (EKS, RDS, KMS), Terraform Observability: Open. Telemetry, Prometheus, Grafana Key Providers: Plaid/True. Layer/Tink, Stripe/Checkout.com/Adyen, Chainalysis/TRM, Notabene/TRISA (Travel Rule) Requirements You are a backend and onramp specialist with a passion for high-throughput, low-latency distributed systems and financial technology. Essential Qualifications : 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, Click. House). 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 environments—you move quickly, measure results, and iterate.

Nice to Have

(Signal Boosters) :

• Payments: ACH/NACHA returns, 3DS/SCA, AVS/CVV, BIN analysis, chargeback workflows, Apple/Google Pay.
• Open banking: Plaid/True. Layer/Tink; account auth and bank‑transfer initiation.
• Risk/Fraud: rule engines, feature stores, device fingerprinting, Plaid Beacon/Signal, dispute/representment flows.
• Compliance plumbing: sanctions/PEP screening, Travel Rule networks, SAR/STR workflow integration.
• Crypto delivery: Solana RPCs, USDC flows, wallet ops, Chainalysis/TRM integrations.
• Accounting: double‑entry ledgers, reconciliation jobs, and data modeling for regulatory/tax reporting (e.g., 1099‑DA/DAC8.
• Infra: AWS, Terraform, Docker/Kubernetes, CI/CD, Open. Telemetry, Prometheus/Grafana.

Benefits

Permanent role (on-site/in-person) in London (UK). Work essentials: MacBook Pro, iPhone, AirPods, screens, headsets, Air. Pods, 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. Recruitment process : Recruiter / HR Call Technical Interview Technical Interview Final Interview