Senior API Engineer

About Squads | Grid:

Grid is an open finance API platform that brings familiar fintech workflows to programmable stablecoin rails. Our REST APIs enable global USD accounts, borderless payments, yield integration, asset trading, and card programs without traditional banking dependencies.

The Role

Design and implement financial APIs that abstract complex infrastructure into developer-friendly interfaces. You’ll build the core API layer powering Grid’s five modules: accounts, payments, yield, trading, and cards.

What You’ll Build

• Core financial APIs powering payments, accounts, cards, trading, and data services
• Developer-friendly abstractions over complex financial infrastructure and compliance requirements
• High-performance systems handling global transactions and real-time financial data
• API gateway architecture with authentication, rate limiting, and comprehensive developer tooling

Required Skills

Core Expertise:

• 5+ years building financial APIs at modern fintech companies
• Expert-level REST API design, authentication, rate limiting, developer experience
• Payment processing, account management, and financial transaction systems
• High-scale system architecture and database design for financial data

Technical Stack:

• Backend: Node.js, TypeScript, Go (Rust strongly preferred)
• Databases: PostgreSQL, Redis
• Infrastructure: AWS/GCP, API gateways, message queuing
• Security: OAuth 2.0, JWT, financial-grade API security standards

Ideal Background

Companies: Stripe, Plaid, Unit, Modern Treasury, Square, Adyen, Revolut, Brex, Mercury, Dwolla, Marqeta, Treasury Prime, Synapse, Ramp, Gusto, Deel, Rippling, Papaya Global, Airwallex, Nium, Razorpay, Modulr, Swan, Griffin, Weavr, Column, Banxa, Moonpay, Ramp Network, Prime Trust, Anchorage, BitGo

Experience:

• API-first fintech platforms with external developer adoption
• High-volume payment processing and real-time financial systems
• Embedded finance and Banking-as-a-Service integration
• Financial compliance automation (KYC/AML, transaction monitoring)

Bonus Points:

• Crypto knowledge
• Solana blockchain ecosystem and Rust programming
• Crypto exchange APIs and Web3 financial services
• Multi-currency and cross-border payment infrastructure

Why Join

Impact: Build financial infrastructure enabling developers to deploy global fintech products 10x faster than on traditional banking

Innovation: Architect APIs at the intersection of open finance principles and programmable money

Culture: Flat organization focused on individual impact over hierarchy (think Stripe/Palantir)

Scale: Global reach across 100+ countries with borderless payments and accounts