Senior Full-Stack Engineer: Fintech Onboarding & API Systems

KitaLulus; Jakarta Pusat; Remote; IDR 600,000,000 - 1,000,000,000; Full time

Job summary

KitaLulus is hiring a senior full-stack engineer in Jakarta to own complex onboarding and application flows. You will build customer portals and backend APIs with TypeScript, React, and Next.js App Router, and work on integrations with CRM, BPM, and credit systems.

collaboration with teams in Berlin and Switzerland ensures a global product scope. You will contribute to AI-assisted development, implement multi-language support, and lead E2E testing for critical journeys, while maintaining robust

Qualifications

• 6+ years of full-stack engineering with TypeScript.
• Strong production experience with React and Next.js App Router.
• Experience in fintech or regulated financial products.
• Proven ownership of onboarding or complex application flows.
• Backend APIs, databases, business logic, and integrations.
• Experience with Zustand or TanStack Query for state management.
• Know-how in multi-language/internationalised apps and English communication.

Responsibilities

• Build and maintain complex multi-step application and onboarding journeys, including validation, document uploads, resumable states, and KYC flows.
• Develop customer, dealer, and operations portals using TypeScript, React, and Next.js.
• Build backend use cases, APIs, database queries, and integrations — this is not a UI-only role.
• Integrate with CRM, workflow engines, compliance services, credit systems, and other external platforms.
• Ensure accurate data mapping and reliable end-to-end application flows.
• Develop and maintain E2E tests for critical customer journeys.
• Collaborate with engineering teams in Berlin and product/operations teams in Switzerland.
• Contribute to specification-driven and AI-assisted development.

Skills

TypeScript

React

Next.js App Router

APIs & DBs

E2E Testing

State Management

Playwright/Cypress

Multilingual Apps

English Proficiency

Fintech/Regulated

Tools

Zod

React Hook Form

Formik

TanStack Query

Playwright

Cypress

Job description

KitaLulus is hiring a senior full-stack engineer in Jakarta to own complex onboarding and application flows. You will build customer portals and backend APIs with TypeScript, React, and Next.js App Router, and work on integrations with CRM, BPM, and credit systems.

collaboration with teams in Berlin and Switzerland ensures a global product scope. You will contribute to AI-assisted development, implement multi-language support, and lead E2E testing for critical journeys, while maintaining robust