Senior Software Engineer (Full-Stack)

We are looking for a Senior Software Engineer, who will like to join our Tech team in Copenhagen!

We're looking for a senior full-stack engineer to join our Tech team in Copenhagen. Someone who's excited about where software development is heading and wants to help shape how we build with AI.

As a member of our Tech team, you'll be an essential part of developing digital products together with our clients and the team around you. Since we're an agency, we work with a wide range of clients, typically in focused sprints where we build new products or improve products we've built with them before. Our stack is TypeScript with Next.js and React at its core, extending into backend services, APIs and integrations as projects demand.

We're operating in a time of agentic engineering. AI agents are changing how software gets built, and we embrace that: we use agentic tools to ship faster and build AI-powered features into client products. At the same time, we know that reaching the quality we aim for means sticking to the fundamentals of good software development. Agents amplify good engineering, they don't replace it. We're looking for someone with strong fundamentals in architecture, code quality and judgment, who can put these new tools to work without compromising on craft.

We have an excellent team across our Copenhagen, Montreal, London and Toronto offices. We'll throw challenges at you, teach you new things, learn from you, and make sure we grow together toward our ambition of setting new and higher standards for the web.

Check out some of our work HERE.

Key tasks

• Shape, build and improve digital products end to end, from frontend (Next.js/React) to backend services, APIs and integrations

• Inspire adoption of agentic engineering: use AI coding agents in daily work and share learnings and insights with a team that explores and grows together

• Build AI-powered features and agentic systems into client products, such as MCP/LLM integrations, automations and intelligent product experiences

• Take technical ownership on client projects: architecture decisions, technical direction, and quality

• Lead by example on good development practices and ways of working, across both technical and non-technical team members

• Stay ahead of new trends and bring them into the team so we keep delivering top services to our clients

• Support with tech knowledge and skills across Signifly's different teams

What we expect of you

• Solid experience as a full-stack developer in a similar senior position, and strong with modern TypeScript, and backend development (, APIs, databases)

• Hands-on experience with AI-assisted and agentic development (tools like Claude Code or similar) and real curiosity about pushing this frontier