Alpaca is a US-headquartered, integral leader in agent-first brokerage infrastructure for stocks, ETFs, options, crypto, fixed income, 24/5 trading, and more.
Amongst our subsidiaries, Alpaca is a licensed financial services company, serving hundreds of financial institutions across 40 countries with our institutional-grade APIs. This includes broker-dealers, investment advisors, wealth managers, hedge funds, and crypto exchanges, totalling over 10 million brokerage accounts.
Our global team is a diverse group of experienced engineers, traders, and brokerage professionals who are working to achieve our mission of opening financial services to everyone on the planet. We're deeply committed to open-source contributions and fostering a vibrant community, continuously enhancing our award-winning, developer-friendly API and the robust infrastructure behind it.
Alpaca is proudly backed by $400 million in funding from top-tier global investors including Portage Ventures, Spark Capital, Tribe Capital, Social Leverage, Horizons Ventures, Opera Tech Ventures, SBI Group, Derayah Financial, Unbound, Peak XV, Elefund, and Y Combinator.
We are seeking a Staff Full Stack Engineer to lead the technical direction of the team that builds Alpaca's Trading API product. A defect can expose customer data, let the wrong person place a trade or move money, or lock a customer out at the moment they need to trade. The customer-facing surfaces also carry real-time trading: an order ticket or positions view that shows stale or wrong data can lead to a bad trade.



We are looking for an engineer who has built and owned systems like this — identity and authorization, account models, and trading or financial applications — and who is as comfortable designing an authorization model as shipping the interface built on top of it.
You will be the senior technical anchor for the team, partnering with the engineering manager, Product, and Design, and working closely with the trading, margin and risk, and platform teams behind the API.
Design the access model for increasingly complex account structures — multiple users per account, sub-accounts, entity and advisor accounts, and delegated API and agent access — so that permissions are explicit, auditable, and enforced on the server.
Lead technical delivery of next-generation Trading API customer applications, including real-time market data, order entry, and positions and order views, as the product expands to new customer surfaces.
Drive the move from legacy monolith endpoints to a dedicated application backend, with clear API contracts between customer applications and platform services such as trading, accounts, transfers, ledger, and market data.
Set the standard for safe delivery: feature flags, staged rollouts, preview environments, testing strategy,



and production observability.
Lead design reviews, mentor senior and mid-level engineers, and raise the engineering bar as the team grows.
8+ years of software engineering experience, with significant time on both backend services and customer-facing applications. Proven ownership of a production system where a defect could expose customer data, grant the wrong access, or cause financial loss.

- Strong backend expertise in Go, or deep experience in Java, Kotlin, C#, or Rust and a clear willingness to work primarily in Go.
- Strong frontend experience with TypeScript and React, including complex, state-heavy applications. Experience with real-time data over WebSockets or other streaming protocols is strongly preferred.
- Solid knowledge of relational databases (PostgreSQL preferred), API design (REST and gRPC), and service-oriented systems running on Kubernetes.
- Demonstrated care for correctness and security: threat modelling, testing strategy, edge-case analysis, and safe production rollout.
- Experience building trading, brokerage, or other financial applications: order entry, positions and P&L;, charting, or real-time market data.

Experience with identity platforms or building identity in-house (for example, Amazon Cognito, Keycloak, or Auth0), passkeys and WebAuthn, or delegated access for third-party applications.
Experience with agentic AI integrations, such as MCP servers or tooling that lets AI agents act safely on a user's behalf.
New Hire Home-Office Setup: One-time USD $500

📌 Senior / Staff Fullstack Engineer (España)
🏢 Alpaca
📍 España