Backend Developer

BJAK started in 2019 and built the first mobile-first insurance platform accessible online by millions in Southeast Asia. The company is expanding to offer services including spending, saving, investing, exchanging, and travelling. BJAK has teams worldwide with over 20 nationalities working in offices and remotely.

• 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.
• Fintech, payments, banking, wallet, KYC, fraud or risk experience is a strong plus, but not required if fundamentals are strong.

• Build backend services and APIs for onboarding, accounts, payments, cards, transfers, rewards, travel, FX, KYC and risk flows.
• Design reliable systems that 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.

This Role Is Not For:

• Engineers who only want isolated backend tasks.
• People who ignore security, data consistency, monitoring or operational risk.
• Developers who cannot work with fast-changing product requirements.
• Candidates who talk about scale but have not handled production systems.
• People who exaggerate impact without being clear on ownership.

This role is remote but candidates must be based in Poland. English is the main working language and strong English communication is required.