Design and build production-grade backend microservices and APIs in Go to scale payment rails. Collaborate with cross-functional teams to ensure reliable, auditable, and compliant transaction flows.
Senior Backend Engineer (Go)
Department: Engineering
Employment Type: Full Time
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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