Subsets (YC S23) is an early-stage startup building the future of AI-driven subscription growth. As a Senior Software Engineer, you’ll join the early team building the future of subscription lifecycle management, helping brands create audiences, run experiments, and optimize how messaging impacts churn, retention, upsell and more!
What you will do
own and ship new features from idea to production
build product and platform capabilities for audience creation, experimentation, and lifecycle insights
work closely with the founders and team to shape product direction and technical decisions
improve the performance, reliability, and scalability of systems that power customer messaging workflows
use customer problems and data to inform what we build next
Tech Stack:
backend: .NET 10, Entity Framework Core, PostgreSQL, Redis
frontend: React.js, Vite, Tailwind CSS, shadcn/ui.
infrastructure & CI/CD: Google Cloud Platform (GCP), Terraform, GitHub Actions.
It's not required to have prior experience with our chosen technologies.
You may be a good fit if
you have a strong bias toward action and the ability to work autonomously in fast-paced, loosely defined environments.
you have experience with Claude Code or similar
you have an "anti-meeting" culture mindset and value focused work time.
you prefer a primarily in-office way of working
you’re energized by the pace and intensity of early-stage startups
Perks
competitive salary & equity
company card for all things office food/snacks
great breakfast and lunch (and dinner when working late in the office)
relocation support if you don't live in Copenhagen
office kayaks 🛶
Skills Required
- Senior-level software engineering experience
- Strong bias toward action and ability to work autonomously
- Ability to own and ship features from idea to production
- Experience with Claude Code or similar
- Preference for a primarily in-office way of working (Copenhagen)
- Familiarity with .NET, React, PostgreSQL, GCP, Terraform, GitHub Actions (not required)
- Comfort working in early-stage, fast-paced startup environments
What We Do
Subsets is an AI-driven lifecycle growth and retention automation platform purpose-built for consumer subscription businesses. The company provides a no-code AI decisioning layer that allows commercial teams to automate lifecycle experimentation, orchestrate personalized user journeys, and optimize retention and lifetime value (LTV) by predicting key audiences and analyzing behavioral drivers of churn.
