About 

Subsets is an agentic lifecycle growth platform for subscription media businesses. We help leading companies, such as The Atlantic, Daily Mail, and Matas, increase subscription growth through AI-driven retention and engagement initiatives. By analyzing subscriber behavior, Subsets automatically generates audiences and measures the incremental revenue lift in lifetime value, all within a no-code platform designed for Lifecycle Marketing and Growth teams.

Commercially, we are growing fast across the UK and the US. We are building a company culture of highly dedicated people with a strong work ethic and a preference for an in-office environment. 

In this role, you will 

We are looking for a Senior Backend Software Engineer passionate about building reliable, scalable integrations with third-party systems. Subsets integrates with many external APIs from major CRM and marketing platforms, including HubSpot, Braze, and Sailthru. You'll own and develop new features from conception to deployment, ensuring reliability and scalability across our integration ecosystem. This includes

• Build and maintain backend services that integrate with third-party CRM APIs.

• Implement and improve data sync processes between our system and external CRMs.

• Improve Subsets’ depth of integrations with third-party CRM APIs to unlock additional functionality for our customers. 

• Ensure integrations are reliable and data stays correct by adding proper validation, monitoring, and error handling.

  
  

You may be a good fit if you have

• (Required) Proficiency with .NET and Entity Framework Core.

• (Required) Experience with building and maintaining robust 3rd party api integrations.

• Experience with DDD.

• Experience with event-driven data architecture.

• PostgreSQL (or general SQL) expertise.

• Experience with Google Cloud Platform.

• Familiarity with Claude Code or other coding agent tools. 

• Strong bias toward action and self-direction with the ability to work autonomously without much oversight. 

• Anti-meeting culture mindset. 

This is neither an exhaustive nor a necessary list of capabilities. If none of these apply to you, but you believe you can contribute to Subsets, please reach out.

How We Work

Our tech stack

• Backend: .NET 10, Entity Framework Core, PostgreSQL,  Hangfire, Redis. 

• Frontend: React.js, Vite, Tailwind CSS, shadcn/ui. 

• Infrastructure & CI/CD: Google Cloud Platform (GCP),  Terraform, GitHub Actions. 

Lightweight and efficient development culture

• Issue tracking and planning via Linear

• 2-week sprints

• Anti-meeting culture - we value focused work time

Benefits

• Competitive salary

• Equity package: 0.3%-0.6% (favorable taxation under §7p, read: no upfront tax on your options!)

• Company card for all things food/snacks: order whatever office snacks you like (we frequently get mango smoothies, protein drinks, barbells, monster, etc.)

• Great breakfast and lunch (and dinner when working late in the office) 

• Office kayaks 🛶

  
  

Applying

• Send your resume and LinkedIn profile.

• We will typically meet three times: 1) for an introductory coffee in our Copenhagen office, 2) for an in-depth technical interview, and 3) for a work trial.

Subsets does not accept remote applications. We value flexibility but prioritize working together from our Copenhagen office most of the time.