Senior Backend Engineer I - Platform

Founded to transform retail finance, Ajaib Group is an Indonesian fintech unicorn breaking barriers to financial access. Having recently secured a $270M Series C—the single largest funding round in Southeast Asia over the past four years—we are backed by premier global investors including Y Combinator, Ribbit Capital, SoftBank, and SBI Holdings.  

To build world-class products, we assemble world-class talent. Supported by our fully remote work arrangement, our team spans Eastern Europe, the Middle East, India, and Southeast Asia, allowing you to work with brilliant engineers and builders from around the globe from wherever you are. We operate with an impact-driven purpose where everyone is the owner of our customers' satisfaction. Driven by a growth mindset and a fierce will to win, we refuse to settle and constantly push engineering boundaries.

As a Senior Backend Engineer I in the Platform team, you build and maintain the shared backend services that every Ajaib product depends on, such as authentication, notifications, configuration and API gateways. You deliver well-defined features with high quality, learn how to design services that many teams rely on, and help keep the foundations stable and secure.

• Design, build and maintain shared backend services and APIs used by many product teams.
• Deliver features from technical design to production, with tests, monitoring and alerting.
• Keep APIs stable and backward compatible, and communicate changes clearly to the teams that use them.
• Build secure services that protect user identity, sessions and personal data.
• Write clear documentation and examples so other engineers can use your services without asking for help.
• Write clean, well-tested code and take an active part in code reviews.
• Investigate production issues, find root causes and help ship lasting fixes.
• Improve the performance and reliability of the services your team owns.
• Work with product engineering teams, Security and Infrastructure to turn requirements into reliable solutions.

• Education: Bachelor's degree in Computer Science or equivalent practical experience.
• Experience: 4+ years of professional backend engineering, including running services in production.
• Languages: Strong in Java, Go or another modern backend language.
• System Design: Good understanding of microservices, REST/gRPC APIs, event-driven design and reliability basics.
• Data & Messaging: Hands-on with relational databases (query tuning), caching (Redis) and messaging (Kafka).
• Security: Working knowledge of authentication and authorization (OAuth2, JWT) and secure coding.
• Infrastructure: Experience with cloud platforms (GCP or AWS), containers and CI/CD.
• Mindset: Ownership mindset, clear communication and a service attitude toward internal users. Experience in fintech or another regulated environment is a plus.