Job Opportunities API

Lead Blockchain Payments Engineer - Fiat Ramps & Financial Infrastructure Location: London On-site | Full-time Compensation: Competitive Our client is an elite team of builders operating at the intersection of fintech and high-scale crypto infrastructure. As a high-growth software organization, the company is responsible for developing the technology behind some of the largest crypto social networks and digital asset launchpads globally. The organization is defined by a philosophy of extreme talent density, rapid iteration, and technical ownership. The Lead Blockchain Payments Engineer (Fiat Ramps) will serve as a core architect of the firm's financial infrastructure. This role is responsible for designing and scaling the services that power seamless fiat-to-crypto flows, real-time risk decisioning, and immutable financial records. Based in London , this is a full-time, in-person position for an engineer who thrives in high-throughput, low-latency environments and is passionate about building the future of global value transfer. Key Responsibilities Payment Orchestration & Integrations Own end-to-end orchestration for major bank rails (ACH, RTP, FedNow, SEPA, Open Banking) and card networks (Apple Pay, Google Pay). Design and implement idempotent, fault-tolerant APIs and robust webhook processing systems. Manage third-party provider integrations for connectivity (Plaid, TrueLayer), processing (Stripe, Adyen), and on-chain compliance (Chainalysis, TRM). Real-Time Risk & Compliance Build and scale a real-time risk engine targeting latencies of $\le 300$ms, incorporating ML scores, device signals, and blockchain analytics. Implement foundational KYC/AML primitives and Travel Rule data plumbing in collaboration with the Compliance team to ensure audit-ready journaling. Financial Integrity & Reconciliation Architect a double-entry ledger and automated reconciliation jobs to synchronize processors, bank statements, and on-chain balances. Develop automated break detection and remediation workflows to maintain absolute financial integrity. Blockchain & Wallet Operations Manage hot-wallet flows, transaction creation, and operational safeguards to ensure safe, rapid delivery of crypto assets (e.g., USDC, SOL). Reliability & Instrumentation Establish high standards for reliability using circuit breakers, dead-letter queues, shadow traffic, and canary releases. Instrument all high-risk financial flows with comprehensive traces, metrics, and logs using OpenTelemetry and Grafana. Cross-Functional Collaboration Work closely with Product, Mobile, Compliance, Risk, and Finance teams to drive features from initial concept through production deployment and iteration. Requirements Fiat Onramp Expertise: Proven experience building fiat ramps end-to-end , including bank and card integrations. System Design & Scale: Deep experience designing and scaling high-throughput, low-latency distributed systems in payments, fintech, or 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 & Webhook Craftsmanship: Mastery of gRPC/REST best practices (versioning, 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 for financial transactions. Security Mindset: Practical experience with key management (HSM/KMS), secrets hygiene, least privilege, and data auditability. Ownership & Ambiguity: Ownership-driven and comfortable operating in high-ambiguity environments—you move quickly, measure results, and iterate ag