Moura's R&S
Senior Back-End Developer — Investment App
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About the Project
We are building an investment app with international operations, currently in the MVP implementation phase. The product is already defined — screens, flows, and business rules are ready — and we are looking for the person who will build the back-end from scratch and connect it to the app's financial infrastructure.
At the heart of the role is the integration with an MPC wallet provider's API, which powers user deposit and withdrawal flows, alongside complementary integrations (KYC, notifications, internal dashboards). Product details are shared under NDA after the initial screening.
Responsibilities
- Architect and build the app's back-end: REST APIs, authentication, accounts, balances, portfolio, and orders.
- Integrate the MPC wallet provider's API: per-user wallet and address creation, deposits, withdrawals, address allow-listing, and transaction policies.
- Consume and handle transaction-confirmation webhooks with idempotency, retries, and automatic reconciliation.
- Model the internal double-entry ledger that keeps balances and movements consistent.
- Implement complementary integrations: KYC/AML provider, push/e-mail notifications, and endpoints for the admin dashboard.
- Own the security of the integration layer: secrets and API-key management, request signing, rate limiting, and audit logs.
- Maintain observability (structured logs, metrics, alerts), automated tests, and CI/CD.
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Requirements
- 5+ years building production back-ends, with at least one critical financial integration in your track record (payments, banking, custody, or similar).
- Strong command of at least one modern back-end stack: Node.js/TypeScript, Go, or Python.
- PostgreSQL and Redis; queues and messaging (SQS, RabbitMQ, or Kafka).
- Solid experience consuming third-party APIs: API-key/OAuth authentication, webhooks, sandbox → production environments, versioning.
- Docker and cloud (AWS or GCP); security best practices for financial applications.
- Working proficiency in English for day-to-day communication and technical documentation.
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Nice to Have
- Prior integration with MPC wallets or digital-asset custody APIs (Fireblocks, BitGo, Utila, Dfns, Copper, or similar).
- Experience at fintechs or regulated institutions; familiarity with PIX and Latin American payment rails.
- Background in event-driven architecture and financial reconciliation systems.
- Experience supporting mobile apps (API contracts for iOS/Android).
Engagement
- 100% remote, international contractor engagement.
- Full-time and exclusive dedication to the project.
- Competitive compensation in USD or BRL, based on seniority and location.
- Immediate start.
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