Open to opportunities

Kobayashi Haruki

@kobayashiharuki

Message

I build reliable backend APIs and full-stack enterprise web applications.

Japan

Message

What I'm looking for

I'm looking to build reliable, scalable web applications and backend systems with collaborative engineering teams, while contributing across design, implementation, testing, debugging, and continuous improvement.

I've built enterprise web applications and backend services at HCLTeck, Capcom, Bitdefender, and Snyk using Python, Java, C#, .NET, JavaScript, TypeScript, and SQL.

At HCLTeck, I develop and maintain web-based business applications, design REST APIs, optimize SQL queries, and improve application stability through automated testing and structured debugging. Previously at Capcom, I built .NET backend services, frontend features, database layers, and corrective solutions for production issues.

I've worked across Japanese and international engineering environments, collaborating remotely across time zones on sprint planning, code reviews, architecture, testing, and maintainable production systems.

Experience

Work history, roles, and key accomplishments

Current

Software Engineer

Current

HCLTech

May 2024 - Present (2 years 3 months)

Developed and maintained web-based business applications using Python, Java, and SQL. Designed and implemented REST APIs, optimized SQL queries, and participated in code reviews and defect-resolution activities.

Python Java SQL REST API Development Database Design SQL Optimization Code Review Debugging Agile Scrum

Full-Stack Software Engineer

Capcom Co., Ltd.

May 2022 - May 2024 (2 years)

Developed enterprise web applications using C#, .NET, JavaScript, and SQL. Built backend services and REST APIs, implemented frontend features, and designed database tables and data-access layers.

C#.NET JavaScript SQL REST API Development Database Design Git Code Review Debugging Agile Scrum

Software Engineer

Bitdefender

May 2020 - May 2022 (2 years)

Worked remotely with an international team, developing backend services using Python and Java. Designed and consumed REST APIs, implemented new functionality, and contributed to performance and reliability improvements.

Python Java REST API Development Distributed Systems Code Review Agile Scrum Remote Collaboration

FullStack Developer

Snyk

May 2018 - May 2020 (2 years)

Developed full-stack applications using C#, .NET, JavaScript/TypeScript, and SQL. Designed backend APIs, integrated frontend applications, implemented authentication and validation, and resolved production defects.