Software Engineer (Java / Treasury Platform)
Location: Hong Kong (Looking for candidates available to start immediately)
About Lightnet
Lightnet Group is a leading Fintech enterprise headquartered in Singapore with a global footprint across APAC and Europe. We build next-generation financial infrastructure to bridge legacy banking rails with digital-asset liquidity, delivering real-time cross-border payments, settlement platforms, and financial services for institutional clients, SMEs, and digital-native businesses.
We are expanding our core engineering team in Hong Kong to build Project Helios—Lightnet’s
next-generation, real-time Treasury and On/Off-Ramp Platform. Helios serves as the high-throughput engine managing multi-currency liquidity, automated double-entry ledger systems, inventory-book netting, and smart order routing across international banking partners and institutional digital-asset venues.
The Role
We are seeking a Java Developer to drive the technical design and backend delivery of Project Helios. In this role, you will architect and build low-latency, resilient distributed treasury services using cutting-edge Java technologies. You will work on various micro-services or components, including pricing engine, order execution engine, risk & hedging engine, settlement, custody and accounting services.
Key Responsibilities
● Core Platform Development: Architect, build, and maintain high-performance, real-time backend
microservices for Project Helios using Java 25 (Virtual Threads), Reactive Java, and Spring Boot.
● System Design & Event-Driven Architecture: Design event-driven workflows utilizing asynchronous
message queues and distributed caching for order lifecycle state machines, real-time price stream
ingestion, and inventory-book hedge triggers.
● Financial Ledger & Transaction Integrity: Design and maintain immutable, secure double-entry
ledger systems and automated EOD reconciliation engines backed by PostgreSQL.
● Integrations Engine: Implement robust integrations via gRPC/REST/WebSockets with digital-asset
custodians, liquidity provider rate streams, and commercial banking APIs.
● Testing & Quality Ownership: Drive high test coverage and platform reliability using Behavior-Driven Development (BDD) and Test-Driven Development (TDD) methodologies.
● Cloud & DevOps Practice: Package, deploy, and monitor scalable cloud components on AWS.
Collaborate on CI/CD pipelines, automated deployments, and operational monitoring.
Mandatory Skills & Experience
● Education: Bachelor’s degree in Computer Science, Software Engineering, or a related quantitative field.
● Backend Expertise: 5+ years of software development experience, with deep expertise in modern
Java (Spring Boot, Dependency Injection, Object-Relational Mapping via JPA/Hibernate).
● Modern Java Paradigms: Hands-on experience or strong working knowledge of modern Java
features, including Java 25 / Virtual Threads (Project Loom) and Reactive Programming (e.g., Spring
WebFlux, Project Reactor).
● Messaging & Caching: Strong background with asynchronous message queue technologies and
high-speed, in-memory data stores (Redis) for caching, distributed locking, or pub/sub patterns.
● Databases & Data Integrity: Advanced SQL and relational database experience (PostgreSQL), with a solid grasp of transaction isolation, distributed locking, and schema design for financial integrity.
● Quality & Testing: Proven experience with BDD (e.g., Cucumber) and TDD frameworks within
automated CI/CD pipelines.
● Cloud & Infrastructure: Experience deploying and operating applications on AWS using Docker and containerized environments.
● Communication: Excellent spoken and written English communication skills.
Ideal Additional Skills & Experience
● AI-Assisted Engineering: Hands-on experience leveraging AI coding tools (e.g., GitHub Copilot,
Cursor, Claude Code, or 'vibe coding' workflows) to accelerate development, boilerplates,
refactoring, and test generation.
● Domain Knowledge: Prior exposure to FX, Treasury management, Double-Entry Ledgers,
Cross-Border Payments, Remittance, or Digital-Asset / Crypto On-Off Ramp systems.
● API & Connectivity: Hands-on experience integrating with third-party Liquidity Providers, banking APIs, or digital-asset institutional custody solutions.
● Security & Infrastructure: Familiarity with secure coding practices (OWASP), secrets management,
Infrastructure as Code (Terraform), and Linux environments.
What Lightnet Offers
● High-Impact Greenfield Project: Direct ownership over a mission-critical Treasury platform (Helios)
utilizing a modern technology stack.
● Global Innovation Culture: An innovative, inclusive, flat organization with collaborative teams across
APAC and international fintech hubs.
● Flexibility & Growth: Flexible work environment in our Hong Kong office, competitive compensation package, and ongoing professional development support.