Backend Developer (Spain)

Responsibilities

• ▹Build backend services and APIs for onboarding, accounts, payments, cards, transfers, rewards, travel, FX, KYC and risk flows
• ▹Design reliable systems that can support real customer transactions, operational workflows and future financial products
• ▹Integrate with internal systems, financial partners, payment providers, AI services and third-party platforms
• ▹Own backend quality across reliability, security, latency, observability, data integrity and incident handling
• ▹Work with product, frontend, mobile and AI teams to launch features quickly and safely
• ▹Improve existing systems by simplifying flows, removing manual work and automating repeatable processes

Requirements

• ▹Strong backend engineering experience in production systems
• ▹Good understanding of APIs, databases, authentication, authorization, queues, jobs, events and integrations
• ▹Experience building services used by real customers or internal operations at meaningful scale
• ▹Strong debugging, reliability, security and data quality mindset
• ▹Able to make practical trade-offs between speed, correctness, scalability and maintainability
• ▹Must be based in Spain
• ▹Strong English communication

Nice to have

• ▹Fintech, payments, banking, wallet, KYC, fraud or risk experience

Soft skills

About the company

BJAK is a mobile-first insurance platform founded in 2019 that became the leading insurance platform in Southeast Asia. The company now covers a broader range of finance - spending, saving, investing, currency exchange, travel - and is building an AI-powered neobank app. The team works remotely and from offices worldwide, with 20+ nationalities.