Senior Backend Engineer, Go

🔥 27 minutes ago

🇧🇷 Brazil – Remote

⏰ Full Time

🟠 Senior

🔙 Backend Engineer

👻 Ghost score 15%

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KAST

WebsiteLinkedInAll Job Openings

201 - 500 employees

Founded 2023

💳 Fintech

₿ Crypto

🔥 Funding within the last year

💰 $80M Series A on 2026-03

Fintech • Crypto

KAST is a financial technology company that provides a stablecoin-powered global money app and card. It offers virtual USD and EUR accounts, instant global transfers, multi-currency business accounts, and debit cards accepted at 150M+ merchants in 170+ countries. KAST lets users hold and spend stablecoins and fiat, earn high rewards via its Reserve product (promotional rates up to 12%), receive cashback on card spending, and deposit/withdraw crypto (USDT, USDC and others) across multiple chains. KAST is not a bank; it issues cards and account-like services through licensed partners and targets freelancers, remote workers, founders, and globally mobile consumers and businesses.

📋 Description

• Design and build production-grade backend microservices and APIs in Go • Implement resilient fallback and routing logic across providers, including limits, uptime, and KYC eligibility, with feature-flagged rollout and safe rollback paths • Partner with fraud detection and onboarding/KYC integrations to keep transaction and onboarding flows compliant and observable • Contribute to FSDs, technical design documents, and delivery estimates; break down work into forward-compatible increments and track open dependencies • Design reliable, auditable, and secure systems with strong observability and operational workflows • Raise backend engineering standards through code review, technical guidance, and mentorship of squad members • Build and scale KAST's LATAM domestic payment rails • Onboard additional fiat payment providers as redundant, hot-swappable rails • Collaborate with Product, Compliance/Risk, L3 production support, and provider partners to ship reliable, auditable payment systems meeting LATAM Central Banks' requirements

🎯 Requirements

• 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) • Must be located in Brazil

🏖️ Benefits

• 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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