Senior Web Engineer II - Platform

Ajaib

5d

About The Position

Ajaib Group is an Indonesian fintech company focused on improving access to financial services. It offers a fully remote work arrangement and has a globally distributed team across Eastern Europe, the Middle East, India, and Southeast Asia.

As a Senior Web Engineer II on the Platform team, you will build and own the web foundations used across Ajaib products, including the design system, component library, shared packages, application shell, browser sign-in and session handling, and build and release tooling. You will own work from technical design through implementation, testing, release, and ongoing support, treating other engineers as your customers and helping them work more effectively.

You will also integrate the centralized OAuth2/OIDC identity platform across web properties, develop secure zero-trust session management, and establish frontend instrumentation standards. The role includes building core telemetry packages for logging, tracing, and error boundaries, as well as improving performance, accessibility, build systems, and production reliability.

Requirements

• Bachelor's degree in Computer Science or equivalent practical experience.
• At least 5 years of professional web engineering experience, including building shared libraries, design systems, or tooling used by several teams.
• Strong TypeScript and JavaScript skills.
• Deep experience with React and a modern framework such as Next.js, including deep knowledge of App Router or Pages Router.
• Strong component design skills.
• Experience with monorepos, bundlers, package publishing, and build performance.
• Experience with unit, integration, visual, and end-to-end testing, CI/CD, and error monitoring.
• Strong browser performance profiling, accessibility, and web security skills, including web authentication.
• Deep understanding of browser mechanics, HTTP headers such as CSP and CORS, cookie security policies, and token lifecycles.
• Ownership mindset, clear communication, and a service attitude toward internal users.

Nice To Haves

• Experience in fintech or another regulated, high-traffic consumer product.

Responsibilities

• Design, build, and maintain shared web foundations, including the component library, design system, shared packages, and application shell.
• Own features end to end, including technical design, implementation, testing, release, and support for teams using them.
• Keep shared packages stable through clear APIs, semantic versioning, changelogs, migration guides, and safe deprecation practices.
• Build accessible, themeable, well-documented components that product teams can adopt without custom work.
• Build and improve secure web sign-in, session, and token handling in collaboration with backend and Security teams.
• Improve build speed, CI/CD pipelines, monorepo tooling, and release automation for web teams.
• Set and measure performance budgets and quality standards, including Core Web Vitals, bundle size, and accessibility checks.
• Write maintainable, well-tested code and provide thoughtful code reviews.
• Investigate production issues using error monitoring and feedback from product teams, and deliver lasting fixes.
• Mentor mid-level engineers and share good web engineering practices across teams.
• Integrate the centralized OAuth2/OIDC identity platform into all web properties, ensuring zero-trust session management and protection against modern web vulnerabilities.
• Establish and enforce company-wide frontend instrumentation standards.
• Build core telemetry packages for logging, tracing, and error boundaries that product teams use to monitor applications in production.

Benefits

• Performance bonus.
• Comprehensive private health insurance.
• Paid time off.
• Company-sponsored training, courses, and professional certifications.
• Hybrid work arrangement with the flexibility to work remotely and from the office.
• Career growth and meaningful ownership while the company scales.
• Employee discounts, partnerships, and lifestyle perks.
• Collaborative, high-ownership culture with cross-functional teams.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior