Full Stack Engineer

FULL STACK DEVELOPERS WANTED | PYTHON, .NET & REACT | LONG-TERM FREELANCE Location: Fully Remote — AnywhereContract: FreelanceDuration: Through to the end of 2027 + extensionStart Date: 1 October 2026Experience: 3–5 yearsLanguage: English We're partnering with a leading European digital technology consultancy specialising in AI, data, software engineering and digital transformation. They work with major enterprise organisations to design and deliver innovative technology solutions across a range of industries. Due to continued growth and an expanding AI-focused programme, they're looking for Mid-Senior Full Stack Developers to join their team on a long-term freelance engagement.You'll work across modern software engineering and AI-driven solutions, with a strong focus on Python, .NET and React. The ideal candidate will have a genuine interest in emerging technologies and be comfortable working across both traditional software development and newer AI technologies. This is a fully remote opportunity, open to candidates based anywhere, with a long-term commitment through to the end of 2027. Key ResponsibilitiesDesign, develop and maintain high-quality full stack applications using Python, .NET and React.Develop scalable backend services, APIs and integrations.Build responsive and user-friendly frontend applications using React.Work closely with AI and data teams to integrate intelligent capabilities into software solutions.Develop and integrate solutions involving vector databases, graph databases and AI-driven applications.Contribute to the design and development of scalable, cloud-based software architectures.Work across the full software development lifecycle, from requirements and design through to development, testing, deployment and maintenance.Collaborate with developers, architects, data engineers and other technical stakeholders to deliver high-quality solutions.Participate in code reviews, technical discussions and continuous improvement initiatives.Stay up to date with emerging technologies and contribute ideas to improve the team's technical capabilities. Essential Skills & Experience3–5 years' commercial experience in full stack software development.Strong professional experience with Python.Strong experience with .NET / C#.Strong frontend development experience with React.Experience developing and integrating RESTful APIs.Good understanding of modern software engineering principles and best practices.Experience working within Agile development environments.Strong problem-solving skills and the ability to work collaboratively within a technical team.Professional fluency in English. Nice to HaveExperience with Qdrant or another vector database.Experience with Neo4j or other graph database technologies.Knowledge of vector search, embeddings or AI-powered applications.Experience working with Generative AI, LLMs or Agentic AI.Experience with cloud platforms such as Azure, AWS or Google Cloud.Experience with Docker, Kubernetes or other containerisation technologies.Broader understanding of the full software development lifecycle.Previous experience working within consultancy or enterprise technology environments. What's on OfferFully remote — work from anywhere.Long-term freelance opportunity.Contract until the end of 2027 + extension. Start date of 1 October 2026.Opportunity to work on innovative AI and digital transformation projects for major enterprise organisations.Exposure to modern technologies including AI, vector databases and graph databases.Opportunity to work alongside experienced software engineers, architects and AI specialists.Negotiable daily rate, depending on experience and technical expertise. 📩 Interested? Contact info@optimistech.co to learn more about this fantastic opportunity!