The Role
Own the architecture and delivery of fiat-to-crypto payment infrastructure, including bank and card integrations, payment orchestration, risk and compliance decisioning, double-entry ledgers, reconciliation, wallet operations, and reliable blockchain transactions. Build fault-tolerant APIs, webhook systems, event-driven services, observability, and operational safeguards for a 24/7 platform. Collaborate with Product, Mobile, Compliance, Risk, and Finance teams while participating in production on-call.
Summary Generated by Built In
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 Senior 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
Skills Required
- Proven experience building fiat ramps end-to-end
- Deep experience in high-throughput, low-latency distributed systems, payments, fintech risk platforms, or similar systems
- Fluency in Rust or Go, or strong systems experience with TypeScript/Node.js or Python
- Expert knowledge of PostgreSQL transactions, indexing, and locking
- Familiarity with Redis and event or OLAP stores such as Kafka/Redpanda and ClickHouse
- Mastery of gRPC/REST best practices, including versioning, pagination, authentication and authorization, idempotency keys, and webhook consumers
- Experience designing event-driven systems with queues, outbox/inbox patterns, Sagas, and exactly-once-effective behavior
- Practical experience with key management, HSM/KMS, secrets hygiene, least privilege, data minimization, and auditability
- Ownership-driven approach and comfort operating in high-ambiguity environments
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The Company
What We Do
The company is a Web3 trading business building a builder-code product on Hyperliquid. Its decentralized technology aims to broaden access to global financial markets spanning crypto, equities, commodities, and other assets. The platform supports on-chain perpetuals trading and has processed more than $65 billion in cumulative volume with over 400,000 registered traders, while scaling backend infrastructure, APIs, data pipelines, real-time delivery, and databases.
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