Senior Full-Stack Software Engineer

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 integrationsInspire adoption of agentic engineering: use AI coding agents in daily work and share learnings and insights with a team that explores and grows togetherBuild AI-powered features and agentic systems into client products, such as MCP/LLM integrations, automations and intelligent product experiencesTake technical ownership on client projects: architecture decisions, technical direction, and qualityLead by example on good development practices and ways of working, across both technical and non-technical team membersStay ahead of new trends and bring them into the team so we keep delivering top services to our clientsSupport 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, Next.js/React and backend development (Node.js, APIs, databases)Hands-on experience with AI-assisted and agentic development (tools like Claude Code or similar) and real curiosity about pushing this frontierExperience building AI-native APIs and product features is a big plusYou're good at understanding real-world client problems and proposing smart technical solutions to address themYou thrive in helping others, whether it's a client, a project manager, a developer colleague or the sales teamYou take ownership: of your code, your projects, and the growth of the people around you Please expect no less from us The most important thing that we offer is an inspiring and ambitious work environment, with an emphasis on learning and developing, both personally and as a team. We have an informal organization with minimal hierarchy, where there is plenty of room for being ambitious within your own area of expertise, as well as taking part in shaping our team, culture, and product offering. But, of course, we can also tempt you with: Yearly one-week team trip with both social and professional focuses (paid)Fresh catered lunch of mostly organic produce and with vegetarian optionsCoffee, tea, soft drinks, snacks, etc. - and wine, beer and drinks on FridaysBeautiful office space with emphasis on noise reduction, centrally located in VesterbroPaid equipment of high quality - you choose what you preferIn-office massage serviceInspiration-trips to events, meet-ups, and conferencesCompany paid pension and health insuranceCompetitive salary based on qualifications and performanceCareer progress based on merits rather than seniorityOpportunity to work-exchange with our office in Montreal, London and Toronto And if you think something is missing, just let us know. We can probably work together to add it. After all, we are trying to create the best possible place to work! About Signifly Signifly is one of the fastest growing agencies in Denmark, and our young and energetic team has won several awards for our innovative approach to digital products and user experiences. We are a young and ambitious team that are constantly pushing the limits for our work and our own capabilities. At Signifly, we collaborate with a broad range of clients from all industries, to create new and innovative digital products and business models. We are a team of developers, designers, film makers and digital strategists, and we believe that creativity, entrepreneurship and a diverse mix of top-notch skills can drive the innovation and change that will help shape a better tomorrow.