Back-End .NET Engineer (Cards)See all recent Jobs

We are looking for an experienced Back-End .NET Engineer to join the Cards Banking Technology team of one of our major clients in the Banking sector. This role focuses on the development and support of transaction-driven backend systems, with particular exposure to card-based banking services (Issuing / Acquiring).

If you enjoy working on high-availability systems, secure APIs, and complex integrations within a regulated financial environment, this opportunity is for you.

Responsibilities

• Design, develop, and maintain backend services for Core Banking and card-related systems using .NET Core / C#.

• Implement and support RESTful APIs used by internal systems and third-party providers.

• Participate in the integration of card payment systems, transaction processing services, and external banking platforms.

• Collaborate with business analysts, architects, and other backend engineers to translate business requirements into technical solutions.

• Ensure performance, scalability, security, and reliability of backend services handling financial transactions.

• Support production environments, investigate incidents, and contribute to root cause analysis.

• Write clean, maintainable, and well-documented code, following enterprise and banking best practices.

Requirements

• Bachelor’s degree in Computer Science, Engineering, or equivalent professional experience.

• 3+ years of experience in back-end development using .NET Core / C#.

• Strong experience with REST APIs, service-oriented or microservices architectures.

• Solid knowledge of relational databases (SQL Server or equivalent), including performance tuning and query optimization.

• Experience working with transactional systems where data consistency, accuracy, and availability are critical.

• Familiarity with banking or card-related concepts, such as:

  • Card transactions lifecycle

  • Authorization & settlement flows

  • Reversals, chargebacks, reconciliations

• Understanding of security principles in financial systems (authentication, authorization, data protection).

• Experience working in enterprise or regulated environments (banking, fintech, payments) is highly valued.

Nice to Have

• Exposure to Core Banking, Issuing, or Acquiring systems.

• Experience with third-party integrations (payment gateways, processors, or external providers).

• Familiarity with logging, monitoring, and troubleshooting in production banking systems.

• Basic understanding of PCI DSS or other financial security standards.

Benefits

• Hybrid working model.

• Private health insurance.

• Unlimited free access to a wellness workplace support platform.

• A dynamic and challenging environment with continuous learning and career growth opportunities.

• Opportunity to work with modern backend technologies in large-scale banking systems.

• Pleasant and collaborative working environment.

UpcoMinds is a dynamic IT company with 28 years of experience that provides end-to-end web and mobile solutions helping businesses to reinvent themselves in the digital world. Our team’s skills and expertise will ensure the holistic digital transformation of any organization, which will considerably improve both business operations and customer’s experience.

Our goal is to always have our end products and services reflect our deep engineering skills and elegant progressive design aesthetic. We fundamentally believe deeply in developing long term strategic partnerships with our clients by exceeding expectations and maintaining a high level of transparency.

Find out more about us at www.upcominds.com

We commit to promote Inclusion & Diversity by creating a working environment where all employees are treated with dignity and respect and where individual differences are valued. We offer equal opportunity in all aspects of employment.

Our recruitment consultants will go through your Curriculum Vitae as soon as possible and get back to you to discuss the opportunity for which you apply. If you don’t hear from us in the coming ten (10) working days, you may consider that you have not been selected for the particular job. Your CV will be retained for two years in accordance with GDPR regulations.