About Lumx
Lumx is building the stablecoin payments stack for Latin America and beyond—API-first on/off-ramps, virtual/external accounts, wallets, and compliant FX. We deliver instant settlements and institutional-grade reliability. Backed by leading partners (including BTG Pactual), we combine product excellence with security and compliance.
The Role
We’re looking for a Senior Software Engineer with advanced experience in fintech, payments, and FX to design, build, and operate existing mission-critical services that power pay-ins, pay-outs, and currency conversion (quoting, rate locks, execution, settlement). You’ll work across API design, event-driven systems, and function-orchestrated workflows, always with reliability, observability, recoverability and idempotency as first-class requirements.
What You’ll Do
Integrate partners fast: Ship high-quality connectors with banks, PSPs, and FX providers.
Own core money flows: Design and run services for pay-ins/pay-outs/FX (quoting, rate-lock, execution, netting, and settlement).
Raise reliability bars: Implement robust idempotency, retries/backoff, DLQs, and graceful degradation.
Build event-driven workflows: Orchestrate function-based workflows and long-running sagas for multi-party financial processes.
Model money correctly: Ensure reconciliation across entities and precise amount/rounding semantics.
Document & mentor: Write clear ADRs/runbooks and help level up the team through code reviews and sharing your technical knowledge.
What You Bring
5+ years building backend services at scale (fintech/payments/FX experience required).
Strong TypeScript + Node.js fundamentals; clean modular design and high-quality APIs (REST/JSON).
Deep understanding of event-driven architectures (queues/streams), saga patterns, and function-orchestrated flows (experience with Temporal.io is a plus).
Solid data fundamentals: relational modeling (PostgreSQL), transactions/consistency, and performance tuning; caching strategies.
Security mindset for financial systems and familiarity with regulated environments (KYC/KYB/KYT concepts).
Nice To Have
Experience with FX & rate-locking, treasury, reconciliation at multi-entity scale.
Knowledge of local rails (PIX, ACH), cards, and crypto on/off-ramps.
How We Work
Quality first: strong test coverage, thoughtful code reviews, security by design.
Ownership with context: autonomy, transparency, and tight feedback loops.
Very few meetings, prioritizing deep focus time blocks.
Benefits
Competitive compensation + potential equity
Remote-friendly with flexible hours (Americas time zones)
Learning budget for conferences/courses
Local holidays and supportive time-off policy