Senior Full Stack Engineer (KLI-90)

KitaLulus; Jakarta Pusat; On-site; IDR 480,000,000 - 640,000,000; Full time

Job summary

KitaLulus is seeking a senior full-stack engineer to own complex onboarding journeys and multi‑language customer portals. You will build back-end APIs, integrate with CRM and compliance services, and ensure end-to-end data integrity.

Required 6+ years in full-stack roles, fintech experience, and strong English communication. Collaboration spans Berlin and Switzerland teams, with a focus on scalable, specification-driven development.

Qualifications

• 6+ years of full-stack engineering experience with TypeScript.
• Strong recent production experience with React and Next.js App Router.
• Mandatory: fintech or regulated financial products experience.
• Proven ownership of complex onboarding or application flows.
• Backend capabilities: APIs, databases, and integrations.
• Experience with state management and data-fetching tools.
• Experience with Playwright or Cypress for E2E tests.
• Experience building multi-language/internationalised apps.
• Professional English communication skills.

Responsibilities

• Build and maintain complex multi-step application and onboarding journeys, including validation and KYC.
• Develop customer, dealer, and operations portals using TS, React, and Next.js.
• Build backend use cases, APIs, databases, and integrations.
• Integrate with CRM, workflow engines, compliance services, and credit systems.
• Ensure accurate data mapping and reliable end-to-end flows.
• Develop and maintain E2E tests for critical journeys.
• Collaborate with engineering teams in Berlin and product/operations in Switzerland.
• Contribute to specification-driven and AI-assisted development.

Skills

TypeScript

React

Next.js App Router

Fintech experience

Onboarding flows

APIs

Zustand / TanStack Query

React Hook Form / Formik

Zod

E2E testing (Playwright/Cypress)

Multi-language apps

Tools

Playwright

Cypress

Zustand

TanStack Query

Form libraries

Job description

• 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.

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.

Requirements

• 6+ years of full-stack engineering experience with TypeScript.
• Strong recent production experience with React and Next.js App Router.
• Mandatory: Experience working with fintech or regulated financial products.
• Proven experience owning complex onboarding or application flows.
• Strong backend capabilities, including APIs, databases, business logic, and system integrations.
• Experience with state management and data-fetching tools such as Zustand or TanStack Query.
• Experience with React Hook Form/Formik and Zod is preferred.
• Experience with Playwright or Cypress for E2E testing.
• Experience building multi-language/internationalised applications.
• Professional English communication skills.
• Experience with KYC, AML, credit/identity verification, or workflow/BPM integration is a plus.