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 Lead Blockchain Payments 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/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/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, ClickHouse Messaging: Kafka/Redpanda, NATS API/IPC: gRPC/REST Infra: AWS (EKS, RDS, KMS), Terraform Observability: OpenTelemetry, Prometheus, Grafana Key Providers: Plaid/TrueLayer/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, 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 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/TrueLayer/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, OpenTelemetry, Prometheus/Grafana. 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. Recruitment process : Recruiter / HR Call Technical Interview Technical Interview Final Interview Responsibilities The Lead Blockchain Payments Engineer will architect and own essential financial infrastructure, designing and scaling core services for fiat to crypto flows, real-time risk decisions, and robust financial record-keeping. Key missions include owning payment orchestration across major bank rails and card networks, building a real-time risk engine, and shipping a double-entry ledger for financial integrity.

Rust, Go, TypeScript, Node, Python, Postgres, Redis, ClickHouse, Kafka, Redpanda, gRPC, REST, AWS, Terraform, OpenTelemetry, Prometheus