Senior Software Engineer / System Architect (Python/Django)
We are looking for a Senior Software Engineer / System Architect to take ownership of backend Python/Django projects. The role focuses on implementing and maintaining e-commerce APIs, creating partner-facing mock/test endpoints and test cases, supporting operations to help stakeholders track user/order status and ongoing maintenance and feature development of a Django-based loan transaction system project.
Responsibilities
E-commerce API server
Design, implement, and maintain a Python/Django backend service that brokers requests between:
External partner APIs and
Internal kernel APIs/services
Implement and maintain customized encryption / secure payload exchange mechanisms.
Create and maintain mock services and test cases for external parties to support integration testing (mock responses, sandbox behavior, error simulation, replay scenarios).
Define and maintain API contracts: request/response schemas, error codes, idempotency behavior, retry policies, and versioning.
Inspect API usage and traces to help internal teams track current user/order status and to perform root-cause analysis of integration issues.
Collaborate with internal teams and external partners on integration timelines, certification, and incident resolution.
Ensure code quality through reviews, automated tests, CI/CD practices, and secure coding standards.
Loan transaction system
Maintain and continuously develop new features for a Django-based loan transaction record system.
Own the overall architecture across systems: data flow, integration patterns, scalability, resilience, performance tuning, security, and maintainability.
Inspect database record and traces to help internal teams resolve the loan status and to perform root-cause analysis of integration issues.
Implement accrual-based data logic, ensuring correctness across lifecycle events
Optimize database schema, queries, and indexing for correctness and performance
Qualifications
5+ years of backend engineering experience (or equivalent), with strong ownership mindset.
Strong proficiency in Python and Django.
Solid experience building and integrating RESTful APIs (design, implementation, and consumption).
Experience creating mocks/sandboxes and integration test harnesses for external partners.
Strong debugging skills: ability to analyze logs, reproduce issues, and communicate status clearly.
Strong relational database skills, especially MySQL , including:
Schema design for transactional systems
Indexing and query optimization
Data migrations and safe change management
Experience using AI agents to assist coding, debugging, test generation, documentation etc
Good Cantonese, Mandarin, and English (spoken and written) for cross-team and external partner communication.
Preferred Qualifications (Nice to have)
E-commerce and/or FinTech domain knowledge , including common integration patterns, payment/order flows, and industry constraints.
Hands-on experience with security and cryptography in real-world integrations
Experience with loan/repayment transaction systems , accounting/ledger concepts, and/or accrual-based calculations .
Experience with Docker , Linux deployment, Nginx , and cloud environments ( AWS/GCP/Azure ).
Familiarity with observability and production readiness (structured logging, metrics, monitoring/alerting, incident response, runbooks).
Experience designing scalable integration services (rate limiting, backpressure, queues, eventual consistency, idempotency at scale).
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