Kobayashi Haruki
Kobayashi Haruki

Senior Software Engineer

Actively looking · Member since 26 Aug 2026
Message
Location
Osaka, Japan
Desired salary
Unspecified
Work preference
Hybrid
Experience level
Senior

About

Professional summary

I am a software engineer with more than eight years of experience building backend, full-stack, and enterprise web applications. My core technical background includes Python, Java, C#, .NET, SQL, JavaScript, and TypeScript.

I design and develop REST APIs, backend services, database-driven systems, and integrated frontend applications. I am experienced with object-oriented programming, system design, authentication, authorization, data-access layers, and maintainable application architecture.

I have worked across the complete software development lifecycle, from requirements analysis and technical design through implementation, testing, deployment, maintenance, and production support. I focus on clean code, reliability, performance optimization, and effective debugging.

I have professional experience in Japanese and international engineering environments, including hybrid work in Japan and remote collaboration with distributed teams across time zones. I communicate effectively with engineers, QA professionals, designers, product stakeholders, and project managers.

I am comfortable working independently and collaboratively in Agile teams. I value code reviews, automated testing, continuous improvement, and building scalable software that solves business needs.

Skills

32 capabilities

Tech stack & tools

Working toolkit

Data Stores

Development

Languages & Frameworks

Experience

Career history

Software Engineer HCLTeck

Develop and maintain web-based business applications using Python, Java, and SQL. Design and implement REST APIs for internal and customer-facing applications, while developing database functionality and optimizing SQL queries.

Participate in requirements analysis, technical design, implementation, testing, and maintenance. Collaborate with Japanese project managers, designers, and engineers, conduct code reviews, resolve defects, and improve application stability through automated testing and structured debugging.

Full-Stack Software Engineer Capcom Co., Ltd.

Developed enterprise web applications using C#, .NET, JavaScript, and SQL. Built backend services and REST APIs in the .NET ecosystem, implemented frontend features, and integrated frontend applications with backend services.

Designed database tables, queries, and data-access layers. Used Git-based workflows and pull-request reviews, investigated production issues, implemented preventive solutions, and collaborated closely with Japanese stakeholders throughout the development lifecycle.

Software Engineer Bitdefender

Worked remotely with an international software development team to develop backend services using Python and Java. Designed and consumed REST APIs for distributed applications and implemented functionality while maintaining production systems.

Participated in remote sprint planning, daily meetings, code reviews, and technical discussions across time zones. Contributed to improvements in application performance, reliability, and maintainability.

FullStack Developer Snyk

Developed full-stack applications using C#, .NET, JavaScript, TypeScript, and SQL. Designed backend APIs and integrated frontend applications with business services, including authentication, validation, error handling, and database functionality.

Investigated and resolved production defects while collaborating remotely with developers, QA engineers, product managers, and technical leads. Contributed to system architecture, technical documentation, development-process improvements, and engineering standards.

Education

Learning history

Osaka Electro-Communication University

Bachelor of Science (BS), Computer Science

Bachelor of Science in Computer Science.

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