Senior Full-Stack Engineer

About the role

Small team, no legacy, no bureaucracy — just strong engineers making the right technical decisions together. This role lives in our Finance domain: settlements, reconciliation, bank integrations, and core banking.

Fintech experience is non-negotiable. You need to arrive with payments knowledge, take ownership fast, and become the go-to expert on settlement and reconciliation. The engineering bar is high — we expect independent judgment and quality delivery.
 

What you'll build

• Financial core — immutable ledger, settlement engine, IC++/blended pricing, rolling reserves
• Integrations — gateways, processors, KYC/KYB, SEPA/SWIFT via REST APIs
• Compliance workflows — Camunda 8, transaction monitoring, sanctions screening, SAR workflows
• Merchant & Ops portals — settlements, payouts, chargebacks, AML, disputes, underwriting
• Developer portal — API docs, integration guides, sandbox
• Reconciliation & reporting — full payment lifecycle; regulatory, scheme, and financial reports
• Quality — automated unit, integration, and E2E tests. No manual QA.
   

What you bring

• 6+ years Kotlin/Java (Spring Boot) — REST, JPA/Hibernate, transactions
• 3+ years Next.js/React — SSR, TypeScript, state management
• Strong PostgreSQL — complex queries, indexing, JSONB, migrations
• Webhook processing, event-driven systems, OAuth2/OpenID Connect
• Hands-on fintech experience — settlements, reconciliation, bank and core banking integrations
• AI fluency — daily use of Cursor, Claude Code, Codex, or similar with real engineering judgment
• Proactivity — you find problems before they find you and drive solutions to completion
• English — confident reading/listening; strong spoken English is a plus