Open to opportunities

Cemal Goymen

@cemalgoymen

I build .NET banking services and ship Next.js SaaS products with payments and OAuth.

At Nucleus Software, I build .NET/C# backend services for banking transaction flows and created a background-job library over Hangfire and Oracle, backed by 249 unit, integration, and E2E tests. I also maintain Postman coverage across 12 banking service domains, resolving issues that blocked QA cycles.

Outside work, I ship Next.js and PostgreSQL SaaS products with Stripe billing, OAuth, and Vercel deployment. My background includes WPF and ASP.NET Core enterprise applications, SQL Server optimization, and React, Angular, and Blazor front ends.

Experience

Work history, roles, and key accomplishments

Current

Software Engineer

Current

Nucleus Software

Apr 2026 - Present (4 months)

Designed and built an internal .NET background-job library wrapping Hangfire over Oracle storage, exposing a clean IJobScheduler abstraction. Implemented custom Hangfire filters, retry policies, and idempotent schema migration, and built a config-driven solution with Autofac DI and OWIN self-hosted dashboard.

SQL Developer (Military Service) - Military

Military

Dec 2024 - Dec 2025 (1 year)

Developed and optimized 50+ SQL queries, triggers, and stored procedures serving critical operational systems. Built automated reporting pipelines that reduced manual report generation time by ~40% and maintained database security and compliance with national data protection protocols.

SQL Query Optimization Stored Procedures Triggers Reporting Pipelines Database Security Data Protection

Junior Software Developer

Hyperion Systems Engineering Group

Nov 2022 - Nov 2024 (2 years)

Developed and maintained WPF desktop applications in C# and SQL
Server for enterprise clients, refactoring legacy modules to reduce bugrelated production downtime by ~15%.
Collaborated with senior engineers to refactor legacy modules, improving
application scalability and response times.
Contributed to Agile/Scrum ceremonies (sprint planning, retrospectives).

ReactJS Developer

Private Person

Jun 2022 - Aug 2022 (2 months)

Delivered a pixel-perfect, responsive UI for a US-based client using ReactJS, CSS3, and modern JavaScript (ES6+). Built a dynamic custom avatar system with real-time preview, meeting all client specifications on schedule.

React CSS JavaScript (ES6+)Responsive Design UI Development