Looking for a job

Umut Oku

@umutoku

Senior .NET backend engineer at OZDISAN ELEKTRONİK building microservices and redesigning Elasticsearch category indexing.

Turkey

Message

What I'm looking for

Seeking senior .NET backend roles with system design and end-to-end ownership across product, search, data, messaging and operations. Based in Istanbul; remote from Türkiye. Open to Turkish employment and international contractor roles. Minimum: TRY 200,000 net/month. TRY 2,400,000/year is the net target; gross compensation must be agreed separately.

At OZDISAN ELEKTRONİK SAN. TİC. A.Ş., I develop .NET microservices across product catalogs, search, identity, orders, integrations, and payments. I redesigned Elasticsearch category projection and rebuild coordination, addressing hierarchy mapping and concurrent rebuild requests, and added regression tests.

I also developed shared MediatR publishing strategies so applications can choose sequential fail-fast execution or collect-all-errors handling. My day-to-day work includes PostgreSQL projections, Redis caching, Kafka workflows, and tracing cross-service issues through logs, jobs, and containers.

Earlier, I worked on Platform 360, an industrial IoT and automation platform at KoçDigital, and on banking technology support and ERP integration workflows at QNB Finansbank. I continue exploring Semantic Kernel, RAG, and agent workflows through personal projects, and I’m interested in senior backend engineering roles involving system design, hands-on implementation, and reliability.

Experience

Work history, roles, and key accomplishments

Current

Software Engineer

Current

OZDISAN ELEKTRONİK SAN. TİC. A.Ş.

Apr 2024 - Present (2 years 6 months)

Develop .NET microservices across product catalogs, search, identity, orders, integrations and payments.
• Redesigned Elasticsearch category projection and rebuild coordination: dictionary/lookup-based hierarchy mapping, parent media correction, cycle handling, and distributed-lock/version-based coordination of concurrent rebuild requests. Added regression tests for category mapping behavior.
• Wo

Software Developer

Fiverr

Jul 2023 - Apr 2024 (9 months)

Delivered custom .NET applications independently through the Fiverr platform, from requirements and API design to implementation and delivery.
• Developed backend APIs and database access for client-specific workflows, alongside frontend integration where required.
• Built asynchronous RabbitMQ workflows and worked on queue and SQL configurations.
• Translated project requirements into application

Software Developer

iCredible Technology, Inc.

Nov 2023 - Feb 2024 (3 months)

Developed .NET backend services for CMS and low-code platforms.
• Worked with PostgreSQL, Elasticsearch, Redis and Kafka across data access, search, caching and asynchronous workflows.
• Integrated external APIs, including Stripe payment workflows and Binance/OKX interfaces.
• Investigated integration behavior and translated platform requirements into backend functionality.

Software Developer

KoçDigital

Sep 2022 - May 2023 (8 months)

Worked in the core platform team on Platform 360, an industrial IoT and automation platform.
• Developed backend functionality across Asset Management, Identity Server and multi-tenant applications processing IoT sensor data.
• Worked on real-time Modbus processing and reporting within microservice-based solutions.
• Maintained and developed the shared Carbon library, supporting reusable platform

Professional development

Career Break

Aug 2021 - Aug 2022 (1 year)

Dedicated this period to structured professional development in .NET and Java, completing intermediate bootcamps and additional technical training. Applied the learning through hands-on projects to strengthen backend development skills.

Support Team Leader - Software Developer

POLDY A.S.

May 2021 - Aug 2021 (3 months)

Led technical support work for HR software, translating operational issues into actionable technical tasks.
• Investigated and resolved issues using SQL, Power BI, C# and C++.
• Worked on reporting, integration requirements and server-system maintenance.
• Coordinated support-request distribution and resolution, connecting user needs with development and operations.

.NET Microsoft SQL Server C#Jira

Software Support Specialist -> Technical Coach

QNB Finansbank

Feb 2020 - Jun 2021 (1 year 4 months)

Worked on banking technology support and ERP integration workflows, progressing from software support responsibilities to technical coaching.
• Developed and maintained SQL queries connecting a C#.NET integration application with ERP systems in the Dijital Köprü project.
• Investigated C# errors, data-transfer issues and SQL behavior; documented technical solutions and supported the development an

.NET Microsoft SQL Server C#ASP.NET Core .NET Core SQL ASP.NET