Blockchain Payments Lead Engineer - London - Startup Talents

    Startup Talents
    Startup Talents London

    5 days ago

    Description
    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 ), 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, , 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

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