Mustafa Güler

Results-driven Backend Developer with 2+ years of experience specializing in Java and Spring Boot. Experienced in building scalable applications, RESTful APIs and reliable backend systems. Strong understanding of software architecture, database design, secure application development and distributed systems.

Able to work effectively across modern technology stacks, including React, TypeScript, Node.js and .NET Core, while focusing on performance, maintainability and business impact. Seeking opportunities to contribute to high-quality software products and continuous technical improvement.

AI Software Developer (Backend & Code Quality) at Outlier AI (2024-10 – 2026-01)

• Analyzed and improved algorithmic implementations to make them more reliable, readable and production-ready.
• Worked on improving code quality and correctness across multiple backend-oriented codebases (Java, Python, C#, JavaScript)
• Reviewed and refined backend logic, identifying edge cases and fixing issues related to data handling, validation and error scenarios.
• Collaborated on evaluating and improving generated code outputs, ensuring alignment with real-world software engineering practices.
• Worked with Docker-based environments and iterated on code using small evaluation sets to quickly test improvements.
• Documented changes and reasoning, focusing on clear communication of fixes and their impact on system behavior.

Backend Developer at Pinatro (2023-03 – 2024-02)

Worked on the backend of an e-commerce application in a startup environment contributing to core features such as product listing, cart and order flows.

• Developed and maintained REST APIs using Spring Boot focusing on clear structure and maintainability.
• Handled data persistence with PostgreSQL writing queries and making small optimizations to improve response times.
• Implemented authentication and authorization using Spring Security and JWT.
• Investigated and fixed performance issues by analyzing slow endpoints and improving backend logic where needed.
• Collaborated closely with frontend developers to integrate APIs and ensure smooth end-to-end functionality.
• Participated in daily development tasks, bug fixing, and feature delivery in an Agile team.

Junior Software Engineer at GittiGidiyor (2021-07 – 2022-02)

• Worked in an 8-member cross-functional Agile/Scrum team, actively participating in daily stand-ups, sprint planning, sprint reviews and retrospectives.
• Contributed to the backend development of a high-traffic e-commerce platform, supporting core modules such as cart, order, and payment systems.
• Supported the maintenance and optimization of transactional systems, focusing on performance, stability, and user experience.
• Collaborated with product owners and team members using Jira and Confluence to track tasks, document features, and deliver sprint goals on time.
• Developed and maintained React.js components under team guidance, improving checkout flow usability and supporting over 50,000 monthly active users.

Computer Programming (English) – İstanbul Aydin University (2018-10 – 2021-06)