Web Developer

Company Overview:

Our client is a well‑established global proprietary trading firm operating across digital asset and electronic markets. The business is highly technology‑driven, with engineering at the core of its trading and market‑making capabilities across multiple regions.
The firm offers a collaborative, flat structure with a strong emphasis on innovation, performance, and continuous learning. Engineers work closely with trading and infrastructure teams to build systems that operate in real time at scale.


Role Overview:

This role sits within a core engineering team responsible for modernising and enhancing internal trading and monitoring platforms. You will play a key role in migrating legacy desktop functionality to a modern web‑based stack, while improving the performance and reliability of real‑time data applications used across the business.


Key Responsibilities:

• Migrate functionality from a legacy C# desktop application to a modern web platform
• Re‑implement complex business logic for high‑performance, real‑time web interfaces
• Build and optimise real‑time data visualisations with minimal latency
• Improve WebSocket‑based data pipelines, including message routing and compression
• Optimise UI performance for large, frequently updating data sets
• Collaborate with infrastructure and backend teams on new feature development
• Provide production support and resolve issues in live systems
• Introduce and maintain automated testing frameworks and best practices

Key Requirements:

• 5+ years of professional experience in C# / .NET development (ASP.NET Core Web APIs)
• Strong experience with modern JavaScript frameworks, ideally Vue.js (Vue 3) and TypeScript
• Proven background building real‑time web applications using WebSockets, SSE, or similar
• Experience with high‑performance data rendering (virtualisation, efficient DOM updates)
• Familiarity with binary data protocols (e.g. Protobuf or equivalent)
• Experience using Web Workers to offload CPU‑intensive tasks
• Solid SQL knowledge and experience with relational databases and ORMs
• Exposure to caching technologies such as Redis
• Experience with message brokers (e.g. Kafka, RabbitMQ, or similar)

Nice to Have:

• Experience with high‑performance data grid libraries
• Knowledge of modern state management and CSS frameworks
• Understanding of authentication and SSO systems (OAuth2, SAML, etc.)
• Background in trading, fintech, or financial services environments

Location & Work Setup:

• Based in Hong Kong
• Primarily onsite with flexibility depending on team requirements

Why Join:

• Work on mission‑critical systems operating in real time
• High level of technical ownership and autonomy
• Collaborative, non‑hierarchical engineering culture
• Competitive compensation aligned with top‑tier trading firms
• Opportunity to deepen expertise across both finance and advanced engineering