Full Stack .NET Engineer Ref #: HQ1554

UBB was established in 1992 through the merger of 22 Bulgarian regional commercial banks as the first and largest in terms of scale consolidation project in the Bulgarian banking sector. Since 2017, the Bank has been part of the Belgian bank-assurance group КВС, currently the largest financial group in Bulgaria.

While invariably standing by our corporate values, we want to be the reference in the bank business through client-centricity in all our activities. We aim at achieving sustainable and profitable growth by fulfillment of our role in society.

UBB is seeking a talented and dynamic Full‑Stack .NET Engineer to join our IT Delivery team

Requirements:

Backend (.NET)

•  5+ years of hands‑on professional experience in .NET (.NET 9.0) / C# backend development, with full‑stack exposure
• Proven experience designing and evolving ASP.NET Core–based architectures following microservices and clean architecture principles
• Strong hands‑on experience with HTTP integrations and consumption of external and internal services
• Deep expertise in API‑first design, using OpenAPI / NSwag for system‑to‑system integrations
• Experience designing and maintaining enterprise‑grade infrastructure libraries, including logging, exception handling, and custom middleware
• Solid understanding of resilience and reliability patterns such as retries, timeouts, circuit breakers, and graceful degradation

Frontend (Angular)

• Strong practical experience with Angular and TypeScript in large‑scale frontend applications
• Proven ability to design modular, scalable, and maintainable frontend architectures
• Solid knowledge of JavaScript, XML/JSON, XSLT, and frontend integration with RESTful APIs
• Experience working with shared UI components, application state management, and frontend best practices
• Ability to ensure frontend performance, usability, and long‑term maintainability

DevOps & Delivery

• Experience collaborating with platform, infrastructure, or SRE teams to improve deployment reliability, scalability, and observability
• Familiarity with monitoring, logging, and alerting concepts in production systems

Data, Quality

• Solid knowledge of Microsoft SQL Server and data‑driven application development
  Ability to write high‑quality, maintainable, testable, and production‑ready code
• Excellent analytical thinking, communication, and technical decision‑making skills
• Proven ability to solve complex problems, lead technical discussions, and guide teams through challenging scenarios
• Fluent English, written and spoken
• University degree in Computer Science, Informatics, Engineering, Mathematics, or a related field

Nice to Have

• Experience in the financial, banking, or fintech domain
• Proven background working on large‑scale enterprise systems
• Experience with CI/CD pipelines, DevOps practices, and release automation
• Experience working in Agile / Scrum environments

Responsibilities

Full‑Stack Delivery

• Contribute to the end‑to‑end lifecycle (design, development, and maintenance) of a new enterprise‑grade online solution, delivering state‑of‑the‑art backend services and APIs using .NET and ASP.NET Core, along with modern frontend components developed in Angular
• Design, develop, and maintain high‑performance, secure backend services and APIs
• Drive the development of scalable, user‑friendly frontend applications, ensuring seamless integration with backend APIs
• Contribute to and continuously improve microservice‑based architectures, aligned with clean architecture principles for a modern online banking solution

 New Functionalities & Platform Capabilities

• Design and implementation of new core functionalities that extend platform capabilities and support evolving business requirements
• Drive the integration of advanced authorization, access‑control, or platform services (e.g., SpiceDB or similar technologies) into the existing system landscape
• Ensure newly introduced functionalities are secure, compliant, well‑documented, and production‑ready
• Collaborate with architects, security teams, and business stakeholders to ensure successful adoption and long‑term maintainability of new capabilities

Integration, Security & Reliability

• Own and maintain reliable integrations with internal and external systems
• Lead API design, versioning, documentation, and lifecycle management using OpenAPI / NSwag
• Ensure secure, compliant, and resilient implementations, applying best practices for data protection and fault tolerance

Engineering Excellence

• Collaborate with DevOps and infrastructure teams to improve deployment reliability, scalability, and monitoring
• Identify and implement engineering improvements that increase delivery speed, quality, and system stability

Support

• 3rd‑level support, resolving production issues, and implementing long‑term architectural and code improvements
• Perform code reviews
• Collaborate closely with frontend engineers, backend engineers, QA, architects, and business stakeholders
• Actively participate in Agile / Scrum ceremonies and support predictable, iterative delivery

You will find:

• Excellent opportunities for professional and career development in one of the leading banks in Bulgaria
• Competitive remuneration
• Various opportunities for learning and further development of professional skills and competencies
• Preferences for the bank products and services
• Additional health insurance
• Life/Accident Insurance
• Food vouchers – 55 EUR
• Referral program
• Additional bonus for important life events
• Hybrid working model and flexible working time (for the employees in Head Office)
• 25 days annual paid leave + 1 additional day for birthday
• Sport card
• Participation in a solidarity fund which helps employees and their families when necessary
  Share your future with us!

Please, send your CV.

Only short-listed candidates will be contacted.

All applications will be treated under strict confidentiality. Personal data are under special protection in accordance with the Law for Protection of Personal Data.