Full Stack Developer

SATURDAYS Indonesia is a growing retail & lifestyle brand operating an omni-channel business with strong warehouse-driven operations. Our technology team plays a critical role in supporting real-world retail execution — from Warehouse Management Systems (WMS) and Point of Sale (POS) to E-Commerce platforms that must be reliable, performant, and operationally sound. You will be joining a small and lean engineering team, reporting directly to the Head of Tech, where individual ownership and engineering maturity matter more than titles.

The Role
We are looking for a Mid / Senior Full-stack Developer who is comfortable working on system-heavy, production-critical applications. This role is hands-on and execution-focused, ideal for engineers who understand how software behaves in real retail and warehouse environments.

This is a contract position, based in Jakarta with a hybrid working arrangement.

Responsibilities

• Design, develop, and maintain full-stack applications supporting retail operations
• Build and optimize REST APIs with strong focus on performance, scalability, and bandwidth efficiency
• Apply clean Object-Oriented Programming (OOP) principles and maintainable system architecture
• Develop and enhance systems related to Warehouse Management (WMS), Point of Sale (POS), and E-Commerce flows
• Work closely with operations, product, and tech stakeholders in a fast-moving environment
• Ensure system reliability, observability, and operational readiness in production
• Participate in troubleshooting, performance tuning, and incident resolution when needed

Security & Architecture Expectations

• Practical understanding of security design across WMS, POS, and E-Commerce systems
• Familiarity with authentication, authorization, data integrity, and API security concepts
• Ability to make sound technical decisions independently, without heavy supervision

Requirements

• Mid-level to Senior-level experience as a Full-stack Developer
• Strong proficiency in Node.js, TypeScript, and REST API design
• Solid experience with relational databases (PostgreSQL, MySQL, or MariaDB)
• Production experience using React and Next.js
• Familiarity with Docker-based development, GitHub, and CI/CD pipelines
• Comfortable working in lean teams with high ownership and accountability

Preferred Qualifications

• Experience in Retail, Warehouse, Logistics, or inventory-heavy systems
• Prior exposure to WMS, POS, or E-Commerce backend systems
• Mandarin proficiency (spoken or written) is a strong advantage

Work Arrangement & Language

• Location: Jakarta (Hybrid)
• Employment Type: Contract
• Language: English is the primary working language; Mandarin is highly preferred