Sr. Backend Engineer I - Investment

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 Sr. Backend Engineer I in the Investment team, you build and maintain the backend services that power stock trading: orders, market data, portfolio and transaction history. You deliver well-defined features with high quality, grow quickly in system design, and help keep a platform running that investors rely on every trading day.

• Design, build and maintain backend services and APIs for stock trading and portfolio features.
• Deliver features from technical design to production, with tests, monitoring and alerting.
• Make sure all process related with financials, quantities and prices are handled accurately, with safe retries and clear audit trails.
• Integrate with internal systems and external parties such as exchange, clearing and bank connections.
• Write clean, well-tested code and take part actively in code reviews.
• Investigate production issues, find root causes and help ship lasting fixes.
• Improve performance and reliability, especially around market open and peak trading volume.
• Work with Product, Operations and Compliance 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).
• Infrastructure: Experience with cloud platforms (GCP or AWS), containers and CI/CD.
• Mindset & Domain: Ownership mindset and clear communication. Experience in capital markets, brokerage, payments or another regulated, high-traffic environment is a strong plus.