Senior Software Engineer

Há 4 dias

Rio de Janeiro, Rio de Janeiro, Brasil Lumx Tempo inteiro R$120.000 - R$240.000 por ano

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 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, function-orchestrated workflows, and internal ledgers—always with reliability, observability, and idempotency as first-class requirements.

What You'll Do

  • Own core money flows:
    Design and run services for pay-ins/pay-outs/FX (quoting, rate-lock, execution, netting, and settlement).
  • Raise reliability bars:
    Define and meet SLOs/SLIs, implement robust idempotency, retries/backoff, DLQs, and graceful degradation.
  • Build event-driven workflows:
    Orchestrate function-based steps and long-running sagas for multi-party financial processes.
  • Model money correctly:
    Evolve our double-entry ledger, reconciliation across entities, and precise amount/rounding semantics.
  • Integrate partners fast:
    Ship high-quality connectors with banks, PSPs, and FX providers.
  • Harden security & compliance:
    Apply least-privilege, secrets management, data classification, and auditability by design.
  • Operate what you build:
    From RFC to runbook—instrumentation (tracing/metrics/logs), on-call, incident response, and post-mortems.
  • Document & mentor:
    Write clear ADRs/runbooks and help level up the team through reviews and technical guidance.

What you bring

  • 6+ years building backend services at scale (fintech/payments/FX experience required).
  • Strong
    TypeScript +
    fundamentals; clean modular design and high-quality APIs (REST/JSON; bonus for gRPC).
  • Deep understanding of
    event-driven architectures
    (queues/streams),
    saga patterns
    , and
    function-orchestrated
    flows.
  • Practical reliability skills: idempotency keys, outbox/inbox, transactional messaging, distributed locking, and concurrency control.
  • Solid data fundamentals: relational modeling (
    PostgreSQL
    ), transactions/consistency, and performance tuning; caching strategies.
  • Engineering excellence: automated testing, CI/CD, feature flags, canaries, and progressive delivery.
  • Security mindset for financial systems and familiarity with regulated environments (KYC/KYB/KYT concepts).

Nice to have

  • Hands-on with workflow/orchestration tools (e.g.,
    AWS Step Functions
    ,
    Temporal
    ).
  • Experience with
    FX & rate-locking
    , treasury, reconciliation at multi-entity scale.
  • Knowledge of local rails (
    PIX
    ,
    ACH
    ), cards, and crypto on/off-ramps.
  • Multicloud exposure and production observability (OpenTelemetry, distributed tracing).

How we work

  • Quality first:
    strong tests, thoughtful code reviews, security by design.
  • Measure what matters:
    DORA metrics, SLOs, and data-driven decision-making.
  • Living docs:
    ADRs, runbooks, and clear incident playbooks.
  • Ownership with context:
    autonomy, transparency, and tight feedback loops.

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

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