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.

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