Senior Software Developer

UAB-Online; Mijdrecht; On-site; EUR 90,000 - 130,000; Full time

Job summary

UAB-Online is seeking a senior software engineer to design, build, and evolve our enterprise SaaS platform using C# and .NET. You will drive modernization, shape architecture, and lead critical reviews across Product and QA teams.

You will explore AI-assisted development and implement automation to improve delivery. The role requires ownership mindset and strong collaboration across functions, with impact on global maritime customers.

Qualifications

• Strong experience with C#, .NET, ASP.NET, and Entity Framework.
• Experience building and maintaining enterprise-scale applications.
• Knowledge of Clean Architecture, SOLID principles, and design patterns.
• Experience modernizing legacy systems and improving existing platforms.
• Hands-on experience with Azure and modern CI/CD practices.
• Experience with automated testing and software quality practices.
• Interest in AI-assisted development or AI-powered applications.
• Strong communication skills and a collaborative mindset.
• A proactive, ownership-driven approach to software engineering.

Responsibilities

• Design, build, and enhance enterprise SaaS applications using C# and .NET.
• Drive platform modernization and help evolve our architecture.
• Lead code reviews and promote engineering best practices.
• Identify opportunities to leverage AI across engineering workflows and product development.
• Introduce, evaluate, and improve AI-assisted development practices, coding agents, and automation tools.
• Build reliable, scalable, and maintainable solutions using Clean Architecture and SOLID principles.
• Develop and optimize CI/CD pipelines and deployment processes.
• Implement automated testing strategies across the development lifecycle.
• Work with Azure cloud services and modern DevOps tooling.
• Collaborate closely with Product, UX, QA, Cloud, and Frontend teams.
• Identify opportunities to reduce technical debt and improve delivery efficiency.
• Take ownership of features from concept through production.

Skills

C#

.NET

ASP.NET

Entity Framework

Clean Architecture

SOLID principles

Azure

CI/CD

Automated testing

AI interest

Design patterns

Communication

Ownership

Job description

Shape the Future of Global Maritime Operations

Every day, ships, terminals, traders and surveyors juggle paperwork, email and phone calls just to get a vessel loaded safely. UAB-Online replaces that chaos with one platform, connecting maritime stakeholders to make liquid and dry bulk operations safer, more efficient and more sustainable.

It's working: 10,000+ users across 100+ terminals have already handled more than 1,000,000 vessel visits on UAB-Online. Now we’re scaling internationally, and we’re looking for developers who want to own meaningful work and help build the new industry standard.

The Opportunity

This is more than a development role.

You’ll play a key part in scaling a business-critical platform used by leading maritime organizations around the world. Working within a modern Microsoft ecosystem, you’ll influence architecture, improve engineering practices, help drive our modernization initiatives, and explore how AI can enhance software development and product capabilities.

If you’re someone who enjoys ownership, continuous improvement, and solving complex technical challenges, we’d love to meet you.

What You’ll Do

• Design, build, and enhance enterprise SaaS applications using C# and .NET
• Drive platform modernization and help evolve our architecture
• Lead code reviews and promote engineering best practices
• Identify opportunities to leverage AI across engineering workflows and product development
• Introduce, evaluate, and improve AI-assisted development practices, coding agents, and automation tools
• Build reliable, scalable, and maintainable solutions using Clean Architecture and SOLID principles
• Develop and optimize CI/CD pipelines and deployment processes
• Implement automated testing strategies across the development lifecycle
• Work with Azure cloud services and modern DevOps tooling
• Collaborate closely with Product, UX, QA, Cloud, and Frontend teams
• Identify opportunities to reduce technical debt and improve delivery efficiency
• Take ownership of features from concept through production.

What You’ll Bring

• Strong experience with C#, .NET, ASP.NET, and Entity Framework
• Experience building and maintaining enterprise-scale applications
• Knowledge of Clean Architecture, SOLID principles, and design patterns
• Experience modernizing legacy systems and improving existing platforms
• Hands-on experience with Azure and modern CI/CD practices
• Experience with automated testing and software quality practices
• Interest in AI-assisted development or AI-powered applications
• Strong communication skills and a collaborative mindset
• A proactive, ownership-driven approach to software engineering.

Nice to Have

• Experience in maritime, logistics, or supply chain environments
• Experience working closely with Product Owners or Agile teams

Why Join UAB-Online?

You’ll build software that powers critical maritime operations around the world, where the code you ship has real operational impact for terminals and crews, not just another internal dashboard.

We’re a scale-up, and it shows: we move fast, get things done, and give you the freedom to own features end-to-end, introduce new ideas, and shape both our platform and our engineering culture. Everyone here has a voice.

We also invest in you. As we grow, you grow, with room to deepen your expertise, raise the bar for the team, and take on more ownership over time. What defines us: we’re genuine, collaborative, and we aim for excellence in everything we build.

If you’re excited about building great software and helping shape the future of a rapidly growing platform, we’d love to hear from you.