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Hi, I’m Kaiyan Zeng, a software engineer focused on building scalable fintech and healthcare solutions. I enjoy turning complex data and requirements into reliable APIs, robust systems, and delightful developer experiences. I’m passionate about performance, security, and maintainability, and I love collaborating with cross-functional teams to deliver value quickly. Over the years I’ve shipped production systems at fintech and health-tech companies, led architectural improvements, and continuously pursued opportunities to automate, optimize, and simplify. I’m especially energized by solving real-world problems with thoughtful, pragmatic engineering. …Hi, I’m Kaiyan Zeng, a software engineer focused on building scalable fintech and healthcare solutions. I enjoy turning complex data and requirements into reliable APIs, robust systems, and delightful developer experiences. I’m passionate about performance, security, and maintainability, and I love collaborating with cross-functional teams to deliver value quickly. Over the years I’ve shipped production systems at fintech and health-tech companies, led architectural improvements, and continuously pursued opportunities to automate, optimize, and simplify. I’m especially energized by solving real-world problems with thoughtful, pragmatic engineering.

Kaiyan Zeng

Full Stack Developer, Developer, Back-End Developer, +5

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Hi, I’m Kaiyan Zeng, a software engineer focused on building scalable fintech and healthcare solutions. I enjoy turning complex data and requirements into reliable APIs, robust systems, and delightful developer experiences. I’m passionate about performance, security, and maintainability, and I love collaborating with cross-functional teams to deliver value quickly. Over the years I’ve shipped production systems at fintech and health-tech companies, led architectural improvements, and continuously pursued opportunities to automate, optimize, and simplify. I’m especially energized by solving real-world problems with thoughtful, pragmatic engineering. …Hi, I’m Kaiyan Zeng, a software engineer focused on building scalable fintech and healthcare solutions. I enjoy turning complex data and requirements into reliable APIs, robust systems, and delightful developer experiences. I’m passionate about performance, security, and maintainability, and I love collaborating with cross-functional teams to deliver value quickly. Over the years I’ve shipped production systems at fintech and health-tech companies, led architectural improvements, and continuously pursued opportunities to automate, optimize, and simplify. I’m especially energized by solving real-world problems with thoughtful, pragmatic engineering.

Available to hire

Hi, I’m Kaiyan Zeng, a software engineer focused on building scalable fintech and healthcare solutions. I enjoy turning complex data and requirements into reliable APIs, robust systems, and delightful developer experiences. I’m passionate about performance, security, and maintainability, and I love collaborating with cross-functional teams to deliver value quickly.

Over the years I’ve shipped production systems at fintech and health-tech companies, led architectural improvements, and continuously pursued opportunities to automate, optimize, and simplify. I’m especially energized by solving real-world problems with thoughtful, pragmatic engineering.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Language

English

Advanced

Chinese

Fluent

Work Experience

Software developer at Necker Fintech Solutions

May 1, 2024 - December 1, 2025

Software Engineer / Email Automation System at Freelancer

January 1, 2024 - April 30, 2024

Software Engineer at Epic Systems

August 31, 2022 - November 1, 2023

Software Engineer at Necker Fintech

May 1, 2024 - Present

Developed portfolio risk assessment RESTful APIs with Java Spring Boot serving 200+ holdings, automatically calculating risk scores and generating risk reports based on portfolio and market data, reducing research report data investigation and analysis from 8 hours daily manual work to 2-minute automated API calls. Implemented scalability optimizations including Redis caching for frequently accessed risk metrics and asynchronous processing, enabling the system to handle 200+ concurrent requests with average response times under 500ms. Integrated TensorFlow-based AI models via Python FastAPI to automatically identify financial anomalies and generate risk commentary sections, enabling analysts to cover 3× more holdings. Implemented Spring Batch overnight jobs with MySQL to pre-calculate daily risk metrics, reducing real-time API computation from 8 seconds to under 1 second for report generation. Configured OAuth2 authentication with Spring Security to protect REST API endpoints, impleme

Software Engineer at Freelancer

January 1, 2024 - April 30, 2024

Built and deployed email automation backend RESTful APIs with Spring Boot, secured with OAuth2 authentication, to automatically fetch booking data, parsed JSON responses with Jackson, and triggered personalized confirmation email dispatch, eliminating 50 hours of manual email work monthly. Implemented event-driven architecture with Apache Kafka to decouple booking events from email processing, using ThreadPoolTaskExecutor for parallel execution, reducing customer notification time from 2-4 hours to under 2 minutes and enabling system to handle 500+ emails monthly without blocking. Engineered fault-tolerant dispatch logic using exponential backoff retries and SMTP connection pooling, achieving 99.9% email delivery reliability. Deployed complete system on AWS EC2 using Jenkins CI/CD pipeline with Docker containerization.