Senior Software Engineer, Bots + Fraud Detection (Emea)

About Mercell

Mercell is a tech company and the market leader in
- procurement in Europe. We're revolutionizing how the public sector procures goods and services, helping buyers and suppliers connect in the most efficient, transparent, and easy way possible.

We are building a new Saa
S platform that automates the entire tendering process, from publication to evaluation and final contract. This complex process involves a lot of API integrations, validations, and intricate steps that need to be handled seamlessly. Our core values—Growth, Curiosity, Courage, and Trust—guide everything we do, from our business decisions to how we collaborate and interact with our colleagues and customers. We are committed to fostering an environment where our employees can develop and thrive.

Responsibilities

• Design, develop, and maintain robust applications using ASP. NET, . NET Core, and. NET Framework.
• Integrate and optimize services within Amazon Web Services (AWS), including SNS, S3, RDS, ECS, EKS, Lambda, etc.
• Support the creation of secure, scalable, and high‑performance software solutions.
• Collaborate closely with other teams and stakeholders to ensure architectural consistency and promote best practice.
• Provide expert guidance on platform improvements and technical challenges.
• Optimize database queries and maintain stored procedures using strong SQL knowledge.
• Contribute to our CI/CD and SDL processes, with a focus on test automation.

Qualifications

• Senior‑level experience with the. NET ecosystem (ASP. NET, . NET Core, . NET Framework).
• Proven experience with cloud computing services, preferably AWS.
• Strong background in building web applications.
• Solid understanding of CI/CD, SDLC processes, and test automation.
• Adherence to clean code principles.
• Strong SQL knowledge and experience with stored procedures.
• Excellent problem‑solving skills and the ability to work both independently and collaboratively within a team.

What we value

• A positive attitude and strong communication skills.
• A collaborative spirit; you enjoy teamwork, coaching, and helping others.
• The ability to navigate complex codebases with minimal documentation and improve them as needed.
• Proficiency in troubleshooting complex issues within production systems.
• A commitment to continuously communicating progress and plans to stakeholders.
• A professional, respectful, and responsible work ethic.
• A passion for continuous improvement and learning.
• Adaptability when dealing with tight deadlines and scope changes.

Locations

• Portugal, Lisbon (remote): Mercell does not currently have a legal entity in Portugal. Employment will therefore be arranged through a trusted Employer of Record (Eo
  R) partner, in line with local regulations. Candidates should be comfortable with this arrangement.
• Netherlands, Utrecht (hybrid): Combination of work from home and on‑site presence in our local office to foster collaboration.

Application

Mercell does not provide relocation support for this position. We are seeking candidates who are already based in, or have existing work authorization for, the country where the role is located.