Senior Software Engineer (.NET)

ZeroNorth A/S; København; Hybrid; DKK 900,000 - 1,200,000; Full time

Benefits offered by this job

Hybrid work model

Job summary

ZeroNorth A/S, based in Copenhagen, drives sustainable shipping through digital solutions that reduce CO2 emissions and optimise global trade.

The Senior Software Engineer will help build scalable backend services in C#/.NET, modernise legacy systems, and improve production reliability, while collaborating closely with the Platform team in a hybrid work environment.

Qualifications

• 5+ years of software engineering experience.
• Proven track record shipping web applications.
• Experience with migration of legacy systems.
• Strong communication and teamwork across time zones.

Responsibilities

• Design, build, and maintain scalable backend services and APIs in C# and .NET.
• Lead modernization by replacing legacy components with new services.
• Improve reliability, performance, and observability of production systems.
• Collaborate on the agentic platform alongside platform teams.
• Mentor teammates through code reviews and pairing.

Skills

C#/.NET

RESTful APIs

Experience 5+ years

Microservices

Legacy migration

AI-assisted development

English communication

Education

B.Sc./M.Sc. in Computer Science or related

Tools

Docker

Kubernetes

Terraform

GitHub Actions

AWS

Job description

At ZeroNorth, we are at the forefront of transforming the shipping industry through digital innovation. Our solutions go beyond optimising business operations, they are designed to lead the industry in sustainability by significantly reducing CO2 emissions.

Our core mission of making global trade greener drives everything we do. Your contributions will play a crucial role in reducing emissions, aligning commercial success with sustainability, and delivering benefits for both profitability and the environment.

ZeroNorth is powered by a diverse team of 550+ professionals with more than 38 nationalities, operating out of global hubs including Copenhagen (our headquarters), Athens, Chennai, Mumbai, Singapore, Sofia, and Tokyo.

We are leading the industry's green transition, enabling our partners to leverage data for actionable decarbonisation efforts.

Senior Software Engineer at ZeroNorth

This is a high-impact role for a heavy backend engineer, with the chance to shape work across three key tracks: building fuel functionality on our new agentic platform, strengthening the reliability and performance of backend services our customers already rely on, and driving the migration away from legacy systems holding the team back.

You’ll play a central role across all three tracks; the stronger the backend foundation you help build, the faster the entire team can move to fully adopt the new agentic platform. It's an opportunity to make a lasting, foundational impact on where the team is headed.

Key responsibilities:

• Build. Design, develop, and maintain scalable backend services and APIs in C# and the .NET ecosystem, with full-stack work in Angular where needed.
• Modernise. Drive the migration away from legacy systems: carve functionality out of ageing components, replace them with well-built services, and keep the platform running while you do it.
• Harden what exists. Improve the reliability, performance, and observability of the backend services in production today, so the platform degrades gracefully instead of failing hard.
• Deliver on the agentic platform. Build fuel functionality on the new platform together with the team and collaborating with the platform teams on shared patterns and tooling.
• Lift the team. Raise the level through code reviews, pairing, and better patterns, so the whole group moves faster toward that goal.

Your profile:

• Deep .NET proficiency. Strong C# and .NET (ideally .NET 10+), with solid experience building and consuming RESTful APIs.
• 5+ years of professional software engineering experience, with a track record of shipping web applications. Familiarity with both microservice and monolith architectures.
• Legacy migration experience. You have modernised systems that were live and business-critical, and you know how to do it incrementally rather than with a risky big bang.
• A multiplier mindset. You raise the level of the engineers around you and measure your success by what the team can deliver, not by what you build alone.
• AI-assisted development. You use AI tools as part of your daily engineering work and have a view on where they help and where they don't.
• DevOps experience. Comfortable with modern cloud infrastructure and CI/CD, containerisation (Docker), and infrastructure-as-code (Terraform). Hands-on Kubernetes is a bonus, not a requirement: our Platform team has built abstractions and documentation on top of it, so engineers can run on the platform with minimal Kubernetes knowledge.
• Quality mindset. Unit and integration testing as a habit, and a commitment to reliable software.
• Communication. Excellent written and verbal English, and experience collaborating across time zones in an agile team.
• A degree in Computer Science, Engineering, or a related field, or equivalent professional experience.

Tech Stack :

• Backend: C#, ASP.NET Core, .NET, EF
• Frontend: Angular, TypeScript
• Database: SQL Server and PostgreSQL
• Cloud & DevOps: AWS, Kubernetes, Docker, Terraform, GitHub Actions
• Methodology: Agile, Scrum, CI/CD

About ZeroNorth

At ZeroNorth, we aim to make global trade sustainable by steering the maritime industry toward zero emissions. Using advanced technology and trusted data, our platform delivers real-time insights to optimize operations and align commercial success with environmental impact.

We partner with customers on their journey toward sustainability, solving complex challenges and empowering informed decisions that benefit both the planet and their bottom line.

Our culture thrives on growth, inclusion, and collaboration. We value honesty, trust, and the unique contributions of every team member, driving meaningful change together.

Let’s make global trade green.

Team

Product Innovation & Technology

Role

Senior Software Engineer

Locations

Copenhagen

Remote status

Hybrid

Employment type

Full-time