Senior Full Stack / Backend Engineer

Lign Co; Jakarta Pusat; On-site; IDR 380,000,000 - 700,000,000; Full time

Job summary

Lign Co in Indonesia is hiring a Senior Software Engineer to design, build, and scale core systems across Next.JS frontends, FastAPI backends, and Terraform-based infrastructure in GCP. You will own substantial parts of the development lifecycle in a pre-seed fintech venture.

You will collaborate with product and design, raise engineering standards from day one, mentor future engineers, and help grow the team as we tackle payments, data, and core financial services.

Qualifications

• 4+ years of professional software engineering experience.
• Experience designing scalable, distributed backend systems.
• Proficiency in TypeScript, Python, Java, or Go.
• Startup environment with ownership and fast pace.
• Bonus: fintech/banking/payments experience.
• Bonus: AI-powered features released to production.

Responsibilities

• Design, build, and maintain core systems across Next.js frontends, FastAPI backends, or Terraform-based infrastructure provisioning in GCP.
• Take full ownership of the software development lifecycle—from design and development to testing, deployment, and production operations.
• Collaborate with product, design, and the founding team to translate user needs into scalable technical solutions.
• Establish and champion high engineering standards across codebase, infrastructure, and processes from day one.
• Help grow the engineering team by recruiting great engineers and mentoring future hires.

Skills

Backend development

Distributed systems

TypeScript

Python

Go

Tools

Next.js

FastAPI

Terraform

GCP

Job description

Lign is a pre-seed fintech company building the definitive financial operating system for businesses in Indonesia. We are creating a tech-enabled, AI-first platform and are seeking an experienced and motivated individual to be a founding member of our engineering team. You will be responsible for creating robust, secure, and scalable systems to power the future of B2B finance in Indonesia.

As one of our first Senior Software Engineers, you will not just write code; you are a co-creator of our product, culture, and technical vision. This role requires a passion for building high-quality products, comfort with the ambiguity of an early-stage venture, and excitement for the challenge of creating something from nothing. You will have immense ownership and impact, tackling complex technical challenges in payments, data, and core financial services.

What You'll Do

• Design, build, and maintain the core systems for Lign's platform, be it Next.JS front-ends, FastAPI backends, or Terraform-based infrastructure provisioning in GCP.
• Take full ownership of the software development lifecycle—from technical design and development to testing, deployment, and operating services in production.
• Collaborate closely with product, design, and the founding team to transform user needs into elegant and scalable technical solutions.
• Establish and champion high engineering standards, bringing consistency and best practices to our codebase, infrastructure, and processes from day one.
• Help grow the engineering team by recruiting great engineers and mentoring future hires.

Requirements

• 4+ years of professional experience in a software engineering role, with a strong background in backend development.
• Proven experience building and designing scalable, distributed systems.
• Proficiency in one or more programming languages, ideally (e.g., TypeScript, Python, Java, Go).
• A high degree of ownership and the ability to thrive in a fast-paced, ambiguous pre-seed startup environment.
• Bonus: Direct experience in the fintech, banking, or payments industry.
• Bonus: Track record of building and releasing AI-powered features to production