Backend (API) Developer

Describe Duties & Responsibilities (In Outline)

About the Role
We are a securities company providing online trading services (MTS/HTS) to retail investors in Indonesia. As a Backend (API) Developer, you will be responsible for the server-side APIs that power our trading and wealth management services — from user authentication and session management to account, order, and market-data related functions. You will work closely with front-end, infrastructure, and back-office teams to keep our services fast, secure, and reliable, in an environment where stability and low latency directly affect our customers' trading experience.
Responsibilities

• Develop, operate, and maintain backend APIs for the company's MTS/HTS (Mobile/Home Trading System)
• Develop and maintain APIs integrated with retail financial services (e.g., WMP)
• Develop and operate authentication services (login, identity verification, etc.) and session management
• Develop and manage interfaces with core/back-office and external systems
• Improve service performance and respond to incidents
• API standardization, documentation, and quality management
  Requirements
• 5+ years of backend development experience (any modern stack — e.g., Python/FastAPI, Java/Spring, Node.js, Go)
• Hands-on experience designing and building RESTful APIs with FastAPI
• Experience developing authentication/authorization (OAuth2, JWT, PKI certificates, etc.) and session management
• Experience with RDBMS (Oracle, MySQL, etc.)
• Solid understanding of high-traffic processing and performance tuning
  Preferred Qualifications
• Experience developing systems in the financial industry (securities, banking, etc.)
• Backend development experience for trading services such as MTS/HTS
• Experience integrating with core (back-office/ledger) or external gateway systems
• Experience with asynchronous programming (asyncio) and the Python ecosystem (Pydantic, SQLAlchemy, etc.)
• Experience with MSA, Kubernetes, Redis, Kafka, etc.
• Understanding of financial IT security requirements and OJK regulations on information technology for financial institutions