Senior Software Engineer

Senior Software Engineer – POS & Cash Systems Compliance (Portugal)

Location: Remote (Portugal-based)

Contract Type: Full-time

About the Role

Our client, a European leader in fiscal middleware and POS system compliance, is seeking a Senior Software Engineer to join their growing team in Portugal. This role is ideal for someone with strong technical expertise in C#/. NET, a passion for building scalable solutions, and experience working directly with clients in the retail or hospitality sectors, particularly around cash register systems and POS integration.

You will contribute to the development of software that ensures compliance with the Portuguese fiscal laws, including SAF-T and standards compliant to the Autoridade Tributaria.

Key Responsibilities

• Design, develop, and maintain. NET-based middleware and POS/cash system integration solutions.
• Collaborate with product and compliance teams to implement features aligned with French fiscal regulations.
• Interface with clients to understand technical requirements and provide integration support.
• Participate in certification processes to meet AT standards.
• Write clean, maintainable code and contribute to architectural decisions.
• Experience with C#, . NET Core, ASP. NET
• Experience with POS systems and cash register software
• Middleware development and system integration
• Strong communication and facing experience
• Ability to work independently and in distributed teams
• Fluent English (B2+) and Portuguese native

Ideal Candidate

• 5+ years of experience in software engineering, ideally in retail tech or fiscal systems.
• Proven track record of working with cash systems and understanding of French fiscal law.
• Proficiency in C# and Cloud infrastructure
• Comfortable engaging with clients and certification bodies.
• Based in Portugal and able to work without any restrictions.

Why Join?

• Work on impactful technology that supports thousands of merchants across Europe.
• Be part of the first, international team.
• Opportunity to shape the future of fiscal compliance in France.