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About Ajaib

Ajaib is an Indonesian investment platform helping people access and manage investments across stocks, mutual funds, crypto, and other digital investment products.

Trusted by more than three million customers, Ajaib is focused on making investing more accessible, affordable, and intuitive. As the platform continues to grow, building reliable, scalable, and secure technology is fundamental to serving customers and supporting the business.

We’re looking for a Staff or Principal Backend Engineer to shape the architecture and technical direction of the backend systems powering Ajaib’s investment, crypto, money, platform, and shared-services products.

The role

You’ll be one of Ajaib’s most senior individual contributors, leading through technical expertise, architectural judgement, and influence rather than people management.

You’ll work closely with Engineering Managers, Product Managers, senior engineers, and engineering leadership to solve complex technical problems and build reliable backend systems that support millions of customers.

At Staff level, you’ll own architecture across multiple squads, lead cross-team initiatives, improve engineering standards, and mentor Senior Engineers.

At Principal level, you’ll define long-term technical direction across a major engineering domain, lead company-wide technical initiatives, and act as a trusted technical adviser to engineering and product leadership.

This is a hands-on technical-leadership role where you’ll work through ambiguity, influence decisions without formal authority, and balance short-term delivery with long-term technical sustainability.

What you’ll do

Lead the design and evolution of mission-critical backend systems

Own architecture across multiple products, services, and engineering squads

Design scalable distributed systems capable of supporting millions of customers and high transaction volumes

Drive architecture decisions across product, platform, infrastructure, security, and data teams

Lead architecture and system-design reviews for high-impact initiatives

Balance immediate delivery needs with long-term scalability, reliability, and maintainability

Identify systemic engineering challenges before they become organisational bottlenecks

Improve system reliability, performance, security, observability, and operational resilience

Lead the modernisation of backend platforms, legacy systems, developer tooling, and engineering workflows

Establish strong engineering patterns across microservices, event-driven architecture, API design, and domain-driven design

Coordinate complex technical initiatives across multiple teams

Align technical decisions with customer needs and wider business priorities

Resolve architectural disagreements through data, collaboration, and technical expertise

Strengthen CI/CD, Infrastructure as Code, cloud infrastructure, and automation

Raise the engineering bar through code reviews, design reviews, technical documentation, and mentoring

Write and lead technical proposals, architecture documents, RFCs, and engineering standards

Mentor Senior Engineers and help them develop towards Staff-level responsibilities

Share technical knowledge through workshops, engineering talks, documentation, and internal communities

Partner with Engineering Directors, Heads of Engineering, and Product Leadership on strategic technology investments

What you bring

Strong professional software-engineering experience, including ownership of complex production systems

Expert-level backend development experience using Java, Golang, or both

Deep knowledge of distributed systems, microservices, event-driven architecture, API design, and domain-driven design

Experience designing and operating reliable systems at significant scale

Strong experience with Kafka or similar event-streaming technologies

Experience with Redis and relational databases such as MySQL or PostgreSQL

Experience with Cassandra or similar NoSQL databases