Job Title

About UsPlease make sure you read the following details carefully before making any applications.Equity research runs on powerful but siloed Excel workflows making it difficult to connect with modern tools and AI. Stellar Fusion is building the infrastructure that unlocks the full potential of the sell-side workflow, where the success of AI depends on structured, high-quality data at its core.Founded by top-ranked equity research analysts, we design our product with a deep understanding of how the sell-side works.Already working with leading research firms, we're moving fast to solve real problems with real impact.About the RoleWe are looking for a skilled Software Engineer to join our growing engineering team. In this role, you will take ownership of building, maintaining, and improving our backend services and APIs, as well as contributing to frontend systems. You will work closely with cross-functional teams to ship high-quality features, improve system reliability, and shape the architecture of our products.This position offers a unique opportunity to work on diverse technical challenges while making a real impact.Location: London, UKJob Type: Full-time (on site)Level: Mid/SeniorTeam: EngineeringStart: ImmediateNote: We are unable to sponsor a work visa for this role. You must have existing UK work authorization.Key ResponsibilitiesDesign, develop, and maintain backend services and APIs using TypeScript/JavaScript (Node.js)Build and query data models using MongoDB and RedisDevelop, containerize, and deploy applications using DockerCollaborate with product, design, and engineering teams to deliver new featuresWrite clean, maintainable, and well-documented codeImplement and maintain unit and integration testsParticipate in code reviews, architecture discussions, and technical planningContribute to CI/CD pipeline improvements and automationMonitor, debug, and optimize applications in cloud environments (e.g., AWS)Required Skills & Experience35+ years of professional software engineering experienceStrong experience with TypeScript and JavaScript (Node.js)Proficiency in Docker and containerized development workflowsSolid understanding of Git and version control best practicesExperience working with NoSQL databases, especially MongoDB and RedisFamiliarity with AWS services like EC2, Lambda, S3, and CloudWatchComfortable designing and working with RESTful APIsHands-on experience with testing frameworks such as Jest, Mocha, or similarUnderstanding of CI/CD pipelines and modern DevOps practicesStrong problem-solving and debugging abilitiesExcellent communication and teamwork skillsA proactive, ownership-driven mindset and willingness to tackle novel problemsNice to HaveExperience with frontend frameworks like ReactFamiliarity with Kubernetes or other orchestration systemsBackground working with high-scale systems or event-driven architectureExposure to agile development methodologiesWhy Join Us?We offer a collaborative and intellectually stimulating environment where engineers are empowered to take ownership and make meaningful contributions. If you are passionate about building high-quality software and want to work with a motivated, talented team, wed love to hear from you.