Full-Stack Engineer (High-Performance Web Systems)

IO Tech Solutions Limited

Hong Kong Island, Hong Kong SAR, Hong Kong

Full-Stack Engineer (High-Performance Web Systems)

Job Description

What You Will Do

• Legacy Transformation: Reverse-engineer complex business logic from C# WPF systems and architect modern, scalable equivalents in a web-native environment.
• Data Pipeline Engineering: Architect and optimize the end-to-end WebSocket pipeline, implementing advanced techniques like binary serialization (Protobuf), message routing, and bounded channel queuing.
• High-Frequency UI: Develop real-time data visualizations and grids that handle thousands of updates per second with zero UI lag using Web Workers and custom rendering strategies.
• Infrastructure Collaboration: Partner with trading and infra teams to bridge the gap between low-latency backend services and the end-user experience.
• Quality & Resilience: Establish automated testing frameworks for real-time systems and provide tier-2 production support to ensure 24/7 system reliability.

Requirements

• Backend Expertise:
• 5+ years of professional experience in .NET / C# development, specifically with ASP.NET Core Web API.
• Strong proficiency with Entity Framework Core and MSSQL (or similar relational databases).
• Experience implementing and managing Redis or similar caching solutions.
• Familiarity with message brokers such as RabbitMQ, Kafka, or other pub/sub systems.
• Frontend Mastery:
• Deep proficiency in Vue.js (Vue 3) and TypeScript.
• Experience with Pinia for state management and Tailwind CSS for styling.
• Hands-on experience with high-performance data grid libraries (e.g., VXE Table).
• Real-Time Systems & Performance:
• Proven track record building real-time applications using WebSockets, SSE, or similar streaming technologies.
• Expertise in high-performance rendering techniques: virtual scrolling, efficient DOM updates, and handling massive real-time datasets.
• Experience with Web Workers for offloading CPU-intensive tasks to maintain UI responsiveness.
• Knowledge of Protobuf serialization and working with binary data protocols.
• Architecture & Security:
• Solid understanding of modern authentication systems, including OAuth 2.0, SAML, and SSO.
• Ability to establish and maintain automated testing practices and frameworks.
• Preferred Qualifications:
• Previous experience in FinTech, Crypto, or Financial Services.
• Experience building or maintaining trading platforms or high-frequency data dashboards.

Required Skills:

API

Data

FinTech

Routing

Support

Development

Kafka

Vue.js

Authentication

Entity Framework

RabbitMQ

Financial Services

Collaboration

Trading

ASP.NET

Redis

Reliability

Architecture

Infrastructure

CSS

TypeScript

C#

Databases

Security

Testing

Engineering

Business

Management

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