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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Senior Backend Engineer Go

Senior Backend Engineer Go

Skills

Description

What You’ll Be Doing

What You'll Bring

Nice to have

About KAST

Sources

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