Senior Backend Engineer II - 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.

Role Overview

As a Senior Backend Engineer II in the Platform team, you own shared backend services that every Ajaib product depends on, such as identity, notifications, configuration and API gateways, from design to production. You design for many users and many teams, keep services reliable and secure under real traffic, and mentor engineers around you.

• Design, build and run scalable, secure shared backend services and APIs used by many product teams.
• Own larger services end to end, including monitoring, alerting, on-call follow-up and support for the teams that use them.
• Design APIs that stay stable: clear contracts, versioning, backward compatibility and safe deprecation.
• Build and improve identity and access features, such as sign-in, sessions, tokens, permissions and account security.
• Make shared services resilient: rate limiting, graceful degradation, isolation between consumers and safe rollouts.
• Improve observability with useful metrics, logs and traces, and set service level objectives with the teams that depend on you.
• Lead design reviews and give thoughtful code reviews.
• Investigate production incidents, run root cause analysis and ship lasting fixes.
• Mentor mid-level engineers and share knowledge within the team.
• Work with product engineering teams, Security, Infrastructure and Architecture to turn requirements into reliable solutions.
• Design and scale centralized event streaming and asynchronous messaging platforms (Kafka) that power org-wide notifications and async workflows.
• Build and manage high-throughput, low-latency API Gateways and WebSocket infrastructure that serve as the front door for all Ajaib clients.
• Develop and maintain robust feature flagging solutions that allow product teams to safely deploy, canary test, and roll back features dynamically.

Requirements

• Education: Bachelor's degree in Computer Science or equivalent practical experience.
• Experience: 5+ years of professional backend engineering, with a track record of owning production services used by other teams or high traffic.
• Languages: Strong in Java, Go or another modern backend language.
• System Design: Solid understanding of microservices, REST/gRPC APIs, event-driven design, and reliability and observability practices.
• Data & Messaging: Hands-on with relational and NoSQL databases (query tuning), caching (Redis) and messaging (Kafka).
• Security: Strong knowledge of authentication and authorization (OAuth2, OpenID Connect, JWT) and secure coding.
• Infrastructure: Experience running services on cloud platforms (GCP or AWS), with 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.
• Experience transitioning legacy monolithic auth to centralized identity providers (IdP) or implementing Zero Trust patterns across microservices is a strong plus.

Benefits

• Performance Bonus - Get rewarded for the impact you make
• Private Insurance - Comprehensive health coverage for you
• Paid Time Off - Take the time you need to recharge and come back stronger
• Learning & Development - Company-sponsored training, courses, and professional certifications
• Hybrid Work Arrangement - Enjoy the flexibility of working both remotely and from the office
• Career Growth - Work closely with experienced leaders and take on meaningful ownership as we scale
• Employee Perks - Enjoy exclusive discounts, partnerships, and lifestyle perks
• Collaborative & High-Ownership Culture - Work with smart, driven people in cross-functional teams, take ownership, and make a meaningful impact for our users.