Staff Fullstack Developer (TypeScript + Node.js) - barcelona
Senior Developer (TypeScript + Node.js) — Fintech - 100% Remote
At this company, everyone in tech carries the \"Tech Generalist\" title on purpose: no one is only frontend, only backend, or only data. Every engineer has a specialization but works across the stack. Engineers pick up projects end-to-end and rotate between initiatives rather than staying in silos.
We are actively looking for this hire to be an AI Builder — someone who has genuinely adopted AI in their daily engineering workflow and can become an internal reference across the team.
What you'll do
- Design, develop, and maintain end-to-end systems (frontend and backend) — supporting customer-facing workflows and internal backoffice operations.
- Evolve the architecture for scalability, reliability, and security, making pragmatic tradeoffs between speed and long-term maintainability.
- Design and maintain the platform's core financial systems: payment orchestration, ledger infrastructure, underwriting engines, reconciliation pipelines, and real-time deal tracking. Business-critical with strong guarantees on correctness, traceability, and auditability.
- Integrate third-party financial APIs (Taktile, Modern Treasury, Kantox) to automate data ingestion, risk evaluation, and cash movement workflows.
- Raise the team's bar through thoughtful system design, high-quality code reviews, and mentorship — including acting as an internal reference on AI-assisted engineering.
Must-have
- 5+ years shipping production-scale software
- Strong proficiency in TypeScript and Node.js .
- Systems thinker: sees patterns across the stack, designs solutions that scale beyond a single use case.
- AI-native engineer — actively builds with AI tools (Claude Code, Cursor, Codex or similar) and can articulate how and why.
- Pragmatic and business-impact oriented, balancing quality, speed, and simplicity.
- Comfortable in a remote-first, distributed environment with full ownership.
- Fluent English (working language of the team).
Nice to have
- Experience in fintech, credit risk modeling, or high-volume payment processing.
- Background as a startup founder or early-stage engineer.
- Familiarity with Kubernetes, BigQuery, or Google Cloud Platform.
Conditions
- Engagement: freelance via Shakers, 12 months with strong likelihood of extension.
- Location: 100% remote. Remote-first autonomy, trust in the team to manage time and impact.
- High standards, low ego culture.
- Impact at scale — your work empowers thousands of founders.
At Shakers we handle project management, invoicing, and support throughout the engagement. You focus on building robust financial systems with AI-native ways of working.
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