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Mehmet Sinan Şahin

@mehmetsinanahin

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Senior software developer experienced in backend systems, microservices, and enterprise architecture.

Estonia

Message

What I'm looking for

I am looking for senior backend or architecture roles where I can modernize systems, design scalable microservices, and mentor teams in a collaborative, delivery-focused environment.

I am a senior software developer with deep experience designing and delivering web applications and backend systems across banking, insurance, government and fintech domains. I have led architecture and development efforts, migrating monolithic systems to microservices and implementing RESTful integrations for external partners.

My hands-on background spans full lifecycle development—building features, maintaining legacy monoliths, and creating new services using Java, Spring, and messaging platforms. I have implemented integrations for external integrators and delivered enterprise-grade applications for claims, lottery, postal administration, and blockchain-related projects.

I have managed and mentored small teams as a team leader and served as a software architect for large government and corporate projects. I have provided training on Java RMI, Spring, and JavaScript frameworks to government and bank developers, and I hold an Oracle Certified Professional, Java SE 6 Programmer certification.

I seek roles where I can apply proven architecture and backend engineering skills to modernize systems, drive reliable integrations, and mentor teams to deliver scalable, maintainable software.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

IuteCredit Europe AS

Jul 2019 - Present (6 years 2 months)

Developed and maintained the company's web application through a migration from monolithic to microservices architecture and implemented RESTful services for external integrators, improving modularity and integration capability.

Java Spring Boot RESTful Services Microservices PostgreSQL RabbitMQ Hibernate Git

Senior Software Developer

Ignite

May 2017 - Jun 2019 (2 years 1 month)

Built blockchain-backed web application for gold tracking, contributed features to a cryptocurrency wallet and EU-funded textile reuse platform, and added functionality to the Postal Administration of Estonia's web application.

Java Blockchain Cryptography Web Application Development JavaScript PostgreSQL RESTful APIs Git

Team Leader

On Group

Jan 2016 - Jan 2017 (1 year)

Led a team of three developers to deliver a dynamic survey web application and created Excel macros to calculate complex medical premium equations, improving automation and accuracy.

Team Leadership Web Development Java Requirements Gathering JavaScript MySQL Git

Software Architect

Cybersoft

May 2008 - Jun 2015 (7 years 1 month)

Led architectural design and development for large-scale web applications including Sompo Japan Insurance claims system and national agency projects, and developed SAP Java module integrations for the Turkish National Lottery.

Software Architecture Java J2EE Spring MVC Hibernate Oracle System Design Team Leadership

Software Developer

Cybersoft

Nov 2003 - May 2008 (4 years 6 months)

Developed web-based internal audit and information management modules (accounting, fixed assets) for government and utility clients using Struts and J2EE, contributing to core enterprise systems.

Java J2EE JBoss Oracle MySQL Web Application Development Git

Software Developer

Şekerbank T.A.Ş.

Nov 2000 - Nov 2002 (2 years)

Managed bank intranet and Microsoft Exchange email server, and administered Active Directory while developing internal tools using Visual Basic 5.0 to support operations.