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).
• Build and scale a real-time risk engine ( 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

Messaging: Kafka/Redpanda, NATS

API/IPC: gRPC/REST

Infra: AWS (EKS, RDS, KMS), Terraform

Requirements

You are a backend and onramp specialist with a passion for high-throughput, low-latency distributed systems and financial technology.

Essential Qualifications

• 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)

• Open banking: Plaid/TrueLayer/Tink; account auth and bank-transfer initiation.
• 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).
• Contract: Permanent role (on-site/in-person) in London (UK).
• Work essentials: MacBook Pro, iPhone, AirPods, screens, headsets, and cables are provided on Day 1.
• Training and coursework in Crypto, Blockchain, Security, 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.

You are a backend and onramp specialist with a passion for high-throughput, low-latency distributed systems and financial technology., * 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.

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.