Senior Software Engineer (Full-Stack)-Copenhagen, Denmark
Job Description
Signifly is looking for a Senior Software Engineer (Full-Stack) to join its Tech team in Copenhagen. The role focuses on developing digital products with clients and working across frontend, backend services, APIs, and integrations. The core technology stack includes TypeScript, Next.js, and React, with backend development using Node.js, APIs, and databases.
The position places a strong focus on AI-assisted and agentic software development. Responsibilities include using AI coding agents in daily development, building AI-powered features and agentic systems such as MCP/LLM integrations and automations, and sharing technical knowledge with the wider team. The engineer will also take technical ownership of client projects, including architecture decisions, technical direction, and development quality.
Applicants should have solid senior-level full-stack development experience and strong skills in modern TypeScript, Next.js/React, and backend development. Hands-on experience with AI-assisted and agentic development is expected, while experience building AI-native APIs and product features is a plus. The role also requires the ability to understand client problems, propose technical solutions, support colleagues and clients, and take ownership of projects and professional development.
The position is full-time and based in Signifly’s centrally located Vesterbro office.
Requirements
- Solid experience as a full-stack developer in a similar senior position
- Strong skills in modern TypeScript, Next.js/React and backend development
- Experience with Node.js, APIs and databases
- Hands-on experience with AI-assisted and agentic development
- Experience with tools like Claude Code or similar
- Curiosity about AI-assisted and agentic development
- Experience building AI-native APIs and product features is a big plus
- Ability to understand real-world client problems and propose technical solutions
- Ability to support clients, project managers, developer colleagues and the sales team
- Ability to take ownership of code and projects
- Willingness to contribute to the growth of people around you
Apply for this position
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