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I am a Senior Software Engineer with over 10 years of experience building high-performance distributed systems, cloud-native architectures, and secure full-stack applications. I thrive on rapidly learning new technologies, delivering robust solutions, and collaborating with cross-functional global teams to ship systems that meet rigorous European standards and regulatory requirements. In my current role at Avaintec, I architect identity and payment workflows, integrate legacy systems with modern cloud platforms, and drive automation and reliability across distributed subsystems. I am passionate about building secure, scalable software that delivers measurable value for customers in privacy- and compliance-focused industries.…I am a Senior Software Engineer with over 10 years of experience building high-performance distributed systems, cloud-native architectures, and secure full-stack applications. I thrive on rapidly learning new technologies, delivering robust solutions, and collaborating with cross-functional global teams to ship systems that meet rigorous European standards and regulatory requirements. In my current role at Avaintec, I architect identity and payment workflows, integrate legacy systems with modern cloud platforms, and drive automation and reliability across distributed subsystems. I am passionate about building secure, scalable software that delivers measurable value for customers in privacy- and compliance-focused industries.

Chao Sun

Full Stack Developer, Developer, Web Developer, +3

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I am a Senior Software Engineer with over 10 years of experience building high-performance distributed systems, cloud-native architectures, and secure full-stack applications. I thrive on rapidly learning new technologies, delivering robust solutions, and collaborating with cross-functional global teams to ship systems that meet rigorous European standards and regulatory requirements. In my current role at Avaintec, I architect identity and payment workflows, integrate legacy systems with modern cloud platforms, and drive automation and reliability across distributed subsystems. I am passionate about building secure, scalable software that delivers measurable value for customers in privacy- and compliance-focused industries.…I am a Senior Software Engineer with over 10 years of experience building high-performance distributed systems, cloud-native architectures, and secure full-stack applications. I thrive on rapidly learning new technologies, delivering robust solutions, and collaborating with cross-functional global teams to ship systems that meet rigorous European standards and regulatory requirements. In my current role at Avaintec, I architect identity and payment workflows, integrate legacy systems with modern cloud platforms, and drive automation and reliability across distributed subsystems. I am passionate about building secure, scalable software that delivers measurable value for customers in privacy- and compliance-focused industries.

Available to hire

I am a Senior Software Engineer with over 10 years of experience building high-performance distributed systems, cloud-native architectures, and secure full-stack applications. I thrive on rapidly learning new technologies, delivering robust solutions, and collaborating with cross-functional global teams to ship systems that meet rigorous European standards and regulatory requirements.

In my current role at Avaintec, I architect identity and payment workflows, integrate legacy systems with modern cloud platforms, and drive automation and reliability across distributed subsystems. I am passionate about building secure, scalable software that delivers measurable value for customers in privacy- and compliance-focused industries.

Skills

Experience Level

Expert

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Intermediate

Language

English

Fluent

Finnish

Beginner

Work Experience

Full Stack Developer at Avaintec Oy

November 1, 2024 - Present

Designed and implemented advanced and qualified signature solutions using Node.js and Vue.js ensuring full compliance with eIDAS regulations. Led the integration of enterprise SSO using OpenID Connect and OAuth 2.0, implementing secure token validation and claims-based authentication. Designed and launched a dynamic banner management module using PureJson API to create a seamless service-to-user messaging channel. Optimized DevOps pipelines to streamline deployments and improve system stability and performance.

Software Engineer at China Construction Bank Fintech

July 31, 2024 - August 28, 2025

Designed and developed core modules for Software Composition Analysis (SCA) platform to detect and assess open-source and third-party component risks. Architected the core engine of an enterprise SCA platform to handle multi-language dependency resolution, recursive vulnerability matching, and real-time CI/CD integration. Integrated with public and commercial vulnerability databases to automatically detect and report security vulnerabilities and license compliance risks. Designed architecture of core modules for distributed banking subsystems enhancing scalability. Contributed to establishment of banking development standards and implementation procedures, spearheading initiatives to standardize workflows and enhance quality ensuring consistent and compliant project delivery. Authored comprehensive Fintech research reports and white papers influencing industry standards and internal strategy.

Software Developer at Xinhua Technologies Co.Ltd

June 30, 2015 - August 28, 2025

Utilized Delphi to develop and maintain modules for a hospital management system ensuring seamless integration with existing infrastructure. Responsible for design, development, and maintenance of enterprise-level databases using Microsoft SQL Server for data modeling and optimization.

Software Engineer at China Construction Bank Fintech

December 1, 2018 - July 1, 2024

Designed and developed core modules for Software Composition Analysis (SCA) platform to detect and assess open-source and third-party component risks. Architected the core engine to handle multi-language dependency resolution, recursive vulnerability matching, and real-time CI/CD integration. Integrated with public and commercial vulnerability databases to automatically detect vulnerabilities and license compliance risks. Designed the architecture of core modules for distributed banking subsystems, enhancing scalability and data consistency. Contributed to banking development standards and implementation procedures, standardizing workflows and improving quality. Authored FinTech research reports and white papers influencing industry standards and internal strategy.

Software Developer at Xinhua Technologies Co.Ltd

September 1, 2013 - June 1, 2015

Developed and maintained modules for a hospital management system using Delphi, ensuring seamless integration with existing infrastructure. Designed and maintained enterprise SQL Server databases for data modeling and optimization.

Senior Software Engineer at China Construction Bank Fintech

December 1, 2018 - July 31, 2024

Architected a real-time transaction processing system using Kafka and Redis clusters, implementing stream partitioning, asynchronous workflows, and caching strategies to reduce transaction latency and improve throughput. Designed and implemented core banking subsystems for large-scale data synchronization and real-time processing, ensuring fault tolerance and eventual consistency across distributed microservices with Spring Cloud. Developed the core engine of a Software Composition Analysis (SCA) platform, automating the detection of third-party component vulnerabilities and open-source license risks across enterprise codebases. Led the standardization of internal development processes, including vulnerability matching workflows and integrating automated security scans into CI/CD pipelines. Authored technical white papers on financial technology and platform architecture trends, influencing internal engineering strategies and long-term technical decisions.

Software Developer at Xinhua Technologies Co. Ltd

September 1, 2013 - June 1, 2015

Developed and maintained core modules of a hospital management system using Delphi, ensuring high availability and reliability for critical healthcare data. Refactored legacy codebase to improve code quality, maintainability, and long-term system stability. Optimized enterprise database schemas in Microsoft SQL Server, improving query performance for complex reporting and data-intensive modules.