Senior Back-End Software Engineer

At Quento Technologies S.A., the ICT arm of the Qualco Group, we deliver comprehensive and innovative solutions across AI, Digital Engineering, Cloud, and Cybersecurity, helping businesses accelerate digital transformation. With a presence in Greece, Luxembourg, and Belgium, and backed by the expertise of the Qualco Group, we combine deep technical knowledge with strategic partnerships to support business growth.

At Quento Technologies S.A., we empower our people to innovate and lead in delivering transformative ICT solutions to our clients worldwide. Our high-performing, dynamic, and collaborative environment fosters professional growth at every stage.

Quento Technologies S.A. seeks a highly motivated and experienced Senior Back-End Software Engineer specializing in the Microsoft .NET ecosystem. The ideal candidate will be responsible for designing, developing, and maintaining the server-side logic for mission-critical financial applications. You will be a cornerstone of our development team, building the robust, secure, and high-performance services that power modern banking solutions.

This role requires a deep understanding of back-end architecture, database design, and the specific security and performance demands of the financial industry. You will work closely with front-end developers, business analysts, and project managers to deliver seamless and reliable technology solutions.

Your responsibilities will entail:

• Design, develop, and maintain scalable, secure, and high-performance back-end services and APIs using .NET Framework and .NET Core;
• Architect and implement robust data models and database solutions, primarily using MS SQL Server;
• Write clean, efficient, and maintainable code following industry best practices and company standards;
• Collaborate with front-end developers to define and implement RESTful APIs and ensure seamless integration;
• Participate in the entire agile software development lifecycle, from requirement analysis and planning to deployment and maintenance;
• Implement and enforce strict security and data protection measures, adhering to the compliance standards of the banking sector;
• Mentor junior engineers and contribute to technical discussions and architectural decisions;
• Ensuring that all activities and duties are carried out in full compliance with regulatory requirements and supporting the continued implementation of the Group Anti-Bribery and Corruption Policy.

Requirements

• Minimum of 4 years of professional experience in back-end software development;
• .NET Expertise: Expert-level proficiency in C#, .NET Framework, and .NET Core;
• Extensive experience in building RESTful APIs, web services, and microservices;
• Database Proficiency: Substantial, in-depth knowledge of relational databases, especially MS SQL Server;
• Proven ability to design complex database schemas, write advanced T-SQL, and perform query optimization;
• Proven experience working on projects within the Financial Services or Banking industry is mandatory;
• Solid understanding of software architecture patterns (e.g., Microservices, SOA, Domain-Driven Design) and SOLID principles;
• Experience with CI/CD pipelines and cloud platforms (e.g., Azure) is a significant plus;
• Excellent verbal and written communication skills in English;
• A strong analytical and problem-solving mindset, with the ability to work effectively both independently and as part of a collaborative team.

Benefits

Your Life @ Qualco Group

On top of challenging work environment, we are offering:

Competitive compensation, ticket restaurant card, and annual bonus programs

Cutting-edge IT equipment, mobile and data plan

Modern facilities, free coffee and beverages, indoor parking, and company bus

• Private health insurance, onsite occupational doctor, and workplace counselor

Flexible working model, hybrid benefits & home equipment benefits

• Onsite gym, wellness facilities, and ping pong room

Career and talent development tools

Mentoring, coaching, personalized annual learning and development plan

Employee referral bonus, regular wellbeing, ESG and volunteering activities

Your race, gender identity and expression, age ethnicity or disability make no difference in Quento We want to attract, develop, promote, and retain the best people based only on their ability and behavior.

Disclaimer: Quento collects and processes personal data in accordance with the EU General Data Protection Regulation (GDPR). We are bound to use the information provided within your job application for recruitment purposes only and not to share these with any third parties. For more details on the processing of your personal data during the Recruitment procedure, please be informed in the Recruitment Notice, before the submission of your application.