jun zhou

Senior Software Engineer with 7+ years of experience delivering end‑to‑end, production‑grade web and mobile products.

1. Allsee Technologies | Birmingham, UK

iOS Developer / Frontend Developer / Full Stack Developer (FastAPI, Next.js, iOS, AWS, MySQL)

October 2022 – Present

Vieunite 

Digital canvas ecosystem combining hardware, artwork e-commerce platform, and mobile controller application.

• Built spring boot backend APIs for the artwork e-commerce platform, integrating with AWS distributed databases to support reliable transactions and data consistency.
• Implemented http only cookies on frontend and backend to prevent XSS cookie leakage, and added CSRF token protection for stronger security.
• Personally designed the modern interaction and animation language and delivered it in React/Next.JS, including reusable motion components and a consistent transition system (hover/tap micro-interactions, scroll-based reveals) to improve user experience.
• Implemented advanced SEO optimization techniques, including Static Site Generation (SSG) and pre-rendering strategies. Optimized Google search keyword rankings from page 3 to page 1 (7 target keywords within 6 months) through comprehensive on-page SEO, structured data markup, and Core Web Vitals optimization.
• Developed native iOS application in Swift/SwiftUI supporting Bluetooth communication, in-app commerce, content distribution, and user account management. Maintained crash rate consistently below 1% through rigorous error handling, comprehensive unit testing, and proactive crash monitoring using Firebase Crashlytics.
• Integrated hybrid SwiftUI and UIKit frameworks to deliver feature-rich user interfaces with seamless performance across all iOS device families
• Refactored codebase to migrate image assets from server-based elastic storage to Amazon S3, reducing storage costs by 30%.

Vieupoint

Content management system for interactive billboard experiences enabling real-time user submissions. 

• Developed complete frontend landing page and booking interface using Next.js with responsive design across all devices. Architected and implemented client-side synchronisation, real-time communication, and content caching logic using Next.js capabilities.
• Built real-time backend services using FastAPI and Socket.IO for live message distribution, achieving 99.7% uptime SLA with <200ms latency. Designed and implemented a precision time synchronization mechanism using NTP-based clock calibration, reducing per-program playback time variance to sub-10-millisecond levels, ensuring pixel-perfect synchronization across multiple billboard displays. This precision timing architecture enabled flawless content playback coordination in distributed advertising networks.
• Drove strong local launch traction as the screen trended in local Facebook and Instagram communities (account: myvieupoint)

Vieutopia 

AI image generation application leveraging fine-tuned stable diffusion models deployed on AWS.

• Single-handedly architected and developed native iOS application processing AI image generation via fine-tuned Stable Diffusion models on AWS 
• Offloaded part of the image-to-image generative models to iOS clients using Apple CoreML framework, implementing efficient model quantization and optimization for edge deployment on iPhone devices. This edge computing strategy reduced server request queue times by 20%, enabling faster content processing and improved user experience without requiring backend resource scaling
• Optimized performance and user experience, achieving top-150 ranking within Graphics & Design category on UK App Store (April 2024). Maintained <2% crash rate through comprehensive error handling. Achieved 7-day retention rate of 90%

1. New Rock Technologies, Inc. | Shanghai, China

Team Lead / iOS Developer / VoIP Engineer (iOS, Swift, OC, WebRTC)

March 2015 – October 2022

Newlync

Enterprise-grade VoIP application providing unified communications for B2B deployment. 

• Led a 5-person engineering team across mobile platforms, overseeing architecture decisions, implementation strategies, and troubleshooting of critical production issues. 
• Implemented SIP, RTP and DTMF (RFC2833/RFC4733/SIP INFO) in company’s app. 
• Implemented advanced NAT traversal using ICE protocol (STUN/TURN), achieving 99.2% connection success rate across diverse network environments
• Integrated WebRTC as core VoIP engine with customised gRPC signalling to meet enterprise security and performance requirements
• Engineered jitter buffer mechanism leveraging Apple Core Audio framework. Enhanced PESQ (Perceptual Evaluation of Speech Quality) scores from 3.0 to 4.5 (on 5-point scale) under certain conditions, demonstrating substantial voice quality 

1. Ulster University | Belfast, UK

Research Intern (Java, Spring Boot)

October 2014 – January 2015

Cooperative research project with IoT Tech Ltd on thermal sensor-based monitoring systems for telecare and security applications. 

• Designed and implemented motion-tracking visualization algorithm operating at pixel-level resolution using Java. Algorithm achieved 94.7% accuracy in multi-occupancy tracking scenarios while maintaining user privacy through low-resolution thermal imaging approach.
• Published research findings as first author in IEEE International Conference on Bioinformatics and Biomedicine (2015)

Cardiff University, MSc Computing