Senior Web Engineer II - Platform

Ajaib Group; Jakarta Pusat; Hybrid; IDR 350,000,000 - 600,000,000; Full time

Benefits offered by this job

Performance Bonus

Private Insurance

Paid Time Off

Learning & Development

Hybrid Work Arrangement

Career Growth

Employee Perks

Collaborative & High-Ownership Culture

Job summary

Ajaib Group is seeking a Senior Web Engineer II to build the design system, component library, and core web tooling used by multiple product teams. You will own features from design to production, mentor peers, and collaborate with security and backend teams to ensure secure, performant web experiences.

You will work on performance budgets, CI/CD pipelines, and scalable web foundations in a remote- capable, hybrid setup, joining a fintech-focused, high-velocity environment.

Qualifications

• 5+ years of professional web engineering experience.
• Experience building shared libraries, design systems or tooling used by multiple teams.
• Strong in TypeScript and JavaScript with React/Next.js.
• Experience with monorepos, bundlers, and package publishing.
• Solid testing (unit/integration), CI/CD and error monitoring experience.
• Proficient in browser performance profiling, accessibility and web security.

Responsibilities

• Design, build and maintain shared web foundations: component library, design system, shared packages and the application shell.
• Own features end to end: technical design, implementation, testing, release and support for the teams that use them.
• Keep shared packages stable: APIs, versioning, migration guides and deprecation.
• Build accessible, themeable, well-documented components adopted by product teams.
• Improve sign-in, session, and token handling with backend and Security teams.
• Improve build speed, CI/CD pipelines, monorepo tooling and release automation.
• Set and measure performance budgets and quality standards (Core Web Vitals, bundle size).
• Write maintainable, well-tested code and conduct code reviews.
• Investigate production issues from monitoring and feedback and ship lasting fixes.
• Mentor mid-level engineers and share best practices across teams.

Skills

TypeScript

JavaScript

React

Next.js

Design systems

Monorepos

Testing (unit/integration)

CI/CD

Performance profiling

Web security

Authentication on web

Communication

Ownership mindset

Tools

Node.js

Job description

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 Web Engineer II in the Platform team, you build the web foundations that every Ajaib product team builds on: the design system and component library, shared packages, sign-in and session handling in the browser, and the build and release tooling. You own these foundations from design to production, treat other engineers as your customers, and help the engineers around you do better work.

• Design, build and maintain shared web foundations: component library, design system, shared packages and the application shell
• Own features end to end: technical design, implementation, testing, release and support for the teams that use them
• Keep shared packages stable: clear APIs, semantic versioning, changelogs, migration guides and safe deprecation
• Build accessible, themeable, well-documented components that product teams can adopt without custom work
• Build and improve secure sign-in, session and token handling on the web, working with backend and Security teams
• Improve build speed, CI/CD pipelines, monorepo tooling and release automation for all web teams
• Set and measure performance budgets and quality standards, such as Core Web Vitals, bundle size and accessibility checks
• Write maintainable, well-tested code and give thoughtful code reviews
• Investigate production issues from error monitoring and feedback from product teams, and ship lasting fixes
• Mentor mid-level engineers and share good web practices across teams

Requirements

• Education: Bachelor's degree in Computer Science or equivalent practical experience
• Experience: 5+ years of professional web engineering, including building shared libraries, design systems or tooling used by several teams
• Languages & Frameworks: Strong in TypeScript and JavaScript; deep experience with React and a modern framework such as Next.js; strong component design
• Architecture & Tooling: Experience with monorepos, bundlers, package publishing and build performance
• Quality: Solid experience with unit, integration, visual and end-to-end testing, CI/CD and error monitoring
• Performance & Security: Strong in browser performance profiling, accessibility and web security, including authentication on the web
• Mindset: Ownership mindset, clear communication and a service attitude toward internal users. Experience in fintech or another regulated, high-traffic consumer product is a 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