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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.
- Department
- Engineering
- Employment Type
- Full Time
- Location
- Brazil
- Workplace type
- Fully remote
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
About KAST
KAST is redefining stablecoin banking for global citizens, crypto professionals, Web3-native businesses, and high-inflation markets hungry for USD-backed banking. Backed by top-tier global investors and led by the ex-APAC CEO of Circle, our leadership team spans Circle, Airwallex, Revolut, Wise, Grab, Zoom, AWS, and leading OTC desks. We’ve scaled from zero to nearly a million users at ridiculous speed.
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What does a back-end developer in Web3 do?
A back-end developer in web3 typically works on the server-side of a web application, using technologies that are specific to the decentralized web (also known as Web3-related)
This might involve building and maintaining the infrastructure that supports decentralized applications (dApps), or developing the underlying smart contracts and blockchain-based systems that power those dApps
In general, the goal of a back-end developer in web3 is to create the technologies and tools that enable users to interact with the decentralized web in a secure and seamless way.