Sefa Teyek
Cloud Technology Lead with over 20 years of professional experience in the development, management, and migration of online systems across tourism, travel, healthcare-related services, telecommunications, restaurants, and energy domains.
He has built and maintained reliable, scalable, and secure systems aligned with business and operational needs. In addition to his technical background, he is the founder and manager of his own software company, delivering custom software solutions, overseeing development activities, and managing software licensing and compliance processes.
Professional Experience
President
Aug 2024 – Present
- Works on the development and ongoing improvement of enterprise software solutions.
- Responsible for software development activities, system maintenance, and ensuring applications meet business and operational requirements.
- Handles licensing-related processes including software usage compliance, license coordination, and support related to licensed systems and services.
- Successfully contributed to development and maintenance of business-critical software systems.
Cloud Tech Lead / Senior Full Stack Developer / Senior .NET Developer
Sep 2019 – Present
- Led development of project modules for contract replication, data copying between versions, and full contract replication including files.
- Oversaw development and testing processes while resolving client issues and keeping delivery on track.
- Worked concurrently with two teams on separate projects for different U.S. customers.
- Contributed as backend developer to a contract management system using Microservices Architecture Pattern.
- Worked as full-stack .NET developer on a mobile application designed for nurses.
- Used technologies including .NET Core 3.1, Azure Service Bus, SQL Server, Azure Functions, Blob, Redis, CosmosDB, Vue.js, and Capacitor.js.
- Contributed to backend development of a global call center system hosted on AWS Cloud using .NET Core 3.1, SNS/SQS, and RDS.
- Created backend APIs for CRM and financial systems automating payroll, tax reports, and employee timesheets using .NET Core 3.0, RabbitMQ, Azure Service Bus, and ElasticSearch.
Senior Full Stack Developer
Nov 2017 – Sep 2019
- Developed two projects simultaneously: a Tourism Agency System and a Corporate Travel B2B tourism system.
- Created WCF services and worked with IdentityServer4, .NET Core, ASP.NET, ElasticSearch, MongoDB, Knockout.js, Redis, CosmosDB, and SQL Server.
- Led Azure PaaS and IaaS projects and estimated migration efforts from data center to Azure for the Tourism Agency System.
- Architected Corporate Travel System and provided XML integration with flight and tourism companies.
Senior Full Stack Developer & Team Leader
Jun 2009 – Nov 2017
- Managed a team developing the Online Tourism Agency Management System for FTI, a global tourism agency.
- Integrated with tourism providers for importing reservations and implemented SAP integration for financial needs.
- Developed Online Accounting Software covering 44 destinations and serving a minimum of 5 million customers annually.
- Used ASP.NET MVC, SQL Server, RabbitMQ, and AngularJS to support complex global tourism operations.
Education
Bachelor of Science in Economics
2009
Certifications
- Microsoft MCSA — Microsoft Certified Solution Associate, SQL Server 2012, July 2013
- Microsoft MCSD — Microsoft Certified Solution Developers, June 2013
- Microsoft HTML5 with JavaScript and CSS3 Specialist, June 2013
- Microsoft Azure Fundamentals, October 2020
Core Competencies
- Cloud, Docker, and scalable system design
- Object-Oriented Programming
- Test-Driven Development
- Design Patterns and Design Principles
- Refactoring, Code Smells, and Anti-Patterns
- Code quality and coding standards
- Software process improvement
- Agile and Scrum development methods
- Team leadership and productivity
- Training and adapting teams to new processes
- Problem solving and fast adaptation to new technologies
Domain Experience
- Tourism
- Healthcare
- Telecommunications
- Restaurants
- Energy
Technical Stack
- .NET Core, ASP.NET MVC, C#
- Azure Service Bus, Azure Functions, Blob Storage, Azure PaaS / IaaS
- AWS Cloud, SNS/SQS, RDS
- SQL Server, CosmosDB, MongoDB
- Redis, RabbitMQ, ElasticSearch
- Vue.js, AngularJS, Knockout.js, Capacitor.js
- WCF Services, IdentityServer4, XML integrations
- Microservices Architecture Pattern