Backend Engineer
Senior Backend Engineer (Go)
Sao Paulosenior
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Department:
Engineering
Location:
Brazil
Description
We're looking for a hands-on Senior Backend Engineer to help build and scale KAST's LATAM domestic payment rails.
You'll be a core contributor on the effort to onboard additional fiat payment providers as redundant, hot-swappable rails. You'll work closely with Product, Compliance/Risk, L3 production support, and provider partners to ship reliable, auditable payment systems that meet the LATAM Central Banks’ requirements.
Location: remote from Brazil.
What You’ll Be Doing
- Design and build production-grade backend microservices and APIs in
Go - Implement resilient
fallback and routing logic
across providers (limits, uptime, KYC eligibility) with feature-flagged rollout and safe rollback paths - Partner with the fraud detection flow and onboarding/KYC integration to keep transaction and onboarding flows compliant and observable
- Contribute to
FSDs
, technical design docs, and delivery estimates; break down work into forward-compatible increments and track open dependencies/pendencies - Design reliable, auditable, and secure systems with strong observability and operational workflows
- Help raise the bar on backend engineering standards through code review, technical guidance, and mentorship of squad members
What You'll Bring
- 5+ years of software engineering experience
- Strong backend engineering expertise, particularly with
Go - Experience building production-grade APIs and distributed systems, including event-driven / webhook-based integrations with third-party providers
- Solid understanding of system reliability, security, and auditability, especially for money-movement or transactional systems
- Ability to work through ambiguity: reverse-engineer existing flows, freeze interfaces early, and design for parallel delivery when dependencies aren't fully built yet
- Comfortable working cross-functionally with product, compliance, operations, and external provider/partner teams
- Startup mindset with strong ownership and execution ability
- Experience with cloud infrastructure and modern engineering workflows (AWS, containers, relational databases, streaming/messaging)
Nice to have
- Experience integrating
payment providers / payment rails
and reasoning about redundancy, provider failover, and reconciliation - Familiarity with
PIX
and the Brazilian payments landscape, including Central Bank regulatory requirements and named virtual accounts - Experience with KYC/KYB, AML, transaction monitoring, sanctions screening, or fraud/risk tooling
- Experience in crypto, stablecoins, or Web3 infrastructure (e.g. BRL ↔ USDC / stablecoin conversion flows)
- Experience decoupling tightly-coupled systems into provider-agnostic, adapter-based architectures
- Spanish language skills to coordinate with local providers
- Experience with AWS (ECS Fargate, Aurora/PostgreSQL), Kafka, Redis, Kubernetes, or Terraform
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