Senior Fullstack Developer - TWE41400
twentyAI - london, south east england
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Senior Fullstack Engineer Location: Hybrid (Victoria, London)We are working with a rapidly growing fintech start-up that is redefining how global credit investors access and interpret data. Already used by leading investment banks, asset managers, and hedge funds, the company is now expanding its engineering team with a Senior Fullstack Engineer.This is a key hire for a technically strong engineer with 15+ years of experience, deep system-level development expertise, and a solid background in Node.js, Python, AWS, and relational databases such as PostgreSQL. You’ll play a leading role in designing the platform’s architecture, developing backend infrastructure, and contributing to fullstack capabilities.Key responsibilitiesLead the design and development of scalable backend and fullstack systemsBuild and maintain infrastructure using Node.js, Python, and AWS servicesContribute to system-level architectural decisions and best practicesDesign robust, secure, and high-performance services and APIsCollaborate closely with front-end developers, product, and business teamsDrive improvements in system performance, reliability, and observabilityTake ownership of end-to-end technical delivery across major feature areasRequirements15+ years of professional software engineering experienceProven expertise in system-level development, including performance, scalability, and resource managementStrong programming skills in Node.js and PythonDeep experience with AWS (Lambda, DynamoDB, CloudFormation, etc.)Strong database skills with PostgreSQL and DynamoDBFamiliarity with distributed systems, microservices, and integration patternsSome experience or collaboration with front-end frameworks such as Vue or ReactTrack record of technical leadership, mentoring, or team managementComfortable working in fast-moving environments, ideally start-ups or B2B SaaSEligible to work in the UKBenefitsCompetitive salary based on experience25 days holiday plus bank holidaysPension schemeHybrid working model with office based in Victoria, LondonChoice of tech equipmentLearning and development opportunitiesIf you're a senior engineer passionate about building systems that power critical financial insights and are looking to make a direct impact in a fast-growing start-up, we’d love to hear from you.
Created: 2025-07-23