Senior Backend Developer

Are you a skilled backend developer who cares about building reliable systems and thoughtful products that people depend on every day? Then you are what we’re looking for!

About Tiimo

We build Tiimo, an AI daily planner and learning platform made with and for neurodivergent brains. One in five people is neurodivergent. That’s a lot of brilliant minds navigating tools that weren’t designed for them. Tiimo helps with clear visuals, soft nudges, and routines that work with your brain, not against it.¨

Apple named Tiimo iPhone App of the Year 2025 for clarity, care, and creativity. The year before, we were finalists for the Apple Design Award for Inclusivity. We’re proud of the recognition, but even prouder of what it represents: accessible design that genuinely helps people in their everyday lives.

Today, more than 500,000 people plan with Tiimo. From our home in Copenhagen, we’re a team that leads with empathy, ships with ambition, and measures success in everyday wins: getting started, staying on track, and feeling good about it.

About the role

As our new Senior Backend Developer, you will be a hands-on engineer and a trusted technical partner to the rest of the product team. You will help shape and evolve our backend architecture, take ownership of data security and database design, and support frontend and design colleagues in delivering new product experiences.

We build everything in-house, and you’ll join a friendly and ambitious 10-person Tech & Product team based in Copenhagen. The role is hybrid, allowing for a healthy mix of remote and in-office work.

In this role, you will

• Take technical ownership of our backend systems, ensuring they are stable, scalable, and aligned with the product roadmap
• Act as security owner, safeguarding user data and ensuring compliance and best practices
• Own services end-to-end: development, deployment, hosting, performance, and monitoring
• Design, maintain, and optimize our database layer, with a strong focus on data integrity, scalability, and well-structured data models
• Build and maintain key system integrations, including Google Calendar APIs and Apple CalDAV
• Collaborate closely with product, design, and frontend to shape and deliver new features

Upcoming focus areas include

• Continued development of our AI assistant
• Scaling our backend and database architecture as our user base grows
• Further development and hardening of calendar integrations and scheduling logic
• Improving reliability, observability, and security across our platform

You will be a great fit if you

• Are purpose-driven and motivated by building products for an underserved neurodivergent community
• Are a thoughtful, detail-oriented problem-solver with strong communication skills
• Thrive in an international and inclusive environment (English is our working language)
• Have strong experience with .NET and C#
• Have solid experience working with relational databases and data modeling (we use MS SQL)
• Keep security, stability, and maintainability front of mind in your work

Nice to have

• Hands-on experience with Apple CalDAV and/or Google Calendar APIs
• Experience deg and evolving database schemas in production systems
• Frontend development experience
• Experience with CI/CD pipelines
• Experience with unit and integration testing
• Experience from a startup or scale-up environment

Our tech stack includes

• .NET 9 / 10 & C#
• MS SQL (core to our product and data model)
• Azure hosting
• Next.js web app
• SwiftUI iOS app
• Strapi CMS
• Webflow
• Tooling: Linear, GitHub, Azure DevOps, Sentry, Firebase, Mixpanel, Metabase, Slack, Figma, and Notion

Benefits & practicalities

• Flexible working hours and a hybrid setup tailored to your needs
• A high level of responsibility, balanced with strong support from an experienced and caring team
• Hands-on impact on a product used by hundreds of thousands of people worldwide
• A strong commitment to diversity, equity, and inclusion
• You must have the right to work in the EU, as we cannot support work permit applications

How to apply

Apply via our one-click application and share your LinkedIn profile with us. We keep the process simple and focus on getting to know the real you through conversations.

Application deadline: February 1, 2026

We review applications continuously, so we encourage you to apply early. Selected candidates will be invited to a case interview.

We look forward to hearing from you.

Team Tiimo