Senior Full-Stack Engineer

Description

N\-iX is a global software development service company that helps businesses across the globe create next\-generation software products. Founded in 2002, we unite 2,400\+ tech\-savvy professionals across 40\+ countries, working on impactful projects for industry leaders and Fortune 500 companies. Our expertise spans cloud, data, AI/ML, embedded software, IoT, and more, driving digital transformation across finance, manufacturing, telecom, healthcare, and other industries. Join N\-iX and become part of a team where your ideas make a real impact. **About the Client:** Our client is a fast\-growing European fintech company in the business spend management space — corporate cards and related financial products — serving SME and mid\-sized business customers across the EU and UK, in a regulated environment with GDPR compliance obligations. Engineering is organized into cross\-functional squads, with platform/enabling teams providing shared tooling horizontally. The client already runs an AI\-native engineering practice: Claude Code and GitHub Copilot are used daily, supported by a growing library of shared, versioned Skills embedded in key repositories, enabling an end\-to\-end flow from ticket to implementation, testing and PR in several codebases. AI tool/connector rollout follows an approved\-list and pilot process. The client is AWS\-first overall; for data platform and analytics workloads it also runs GCP, with BigQuery as the primary data warehouse. Day\-to\-day coordination is Slack\-first, with Linear for ticket tracking, GitHub for code/PR review, and Notion as the knowledge base. **About the Role:** We're looking for a Senior Full\-Stack Engineer working across the Kotlin backend and React/TypeScript frontend, with a clear leaning toward either front\-end or back\-end depth and the ability to move fluidly between layers to unblock delivery. **Key Responsibilities:** * Deliver across the Kotlin backend and React/TypeScript frontend * Move fluidly between stack layers to unblock delivery * Apply AI\-native delivery practices across the CDLC * Multiply the output and quality of the squad you join, and share patterns/practice beyond your immediate team so adoption compounds across the organisation * Embed directly into a client squad as a hands\-on Individual Contributor (not a coaching/managerial role). **Must\-Have Skills:** * Kotlin (backend) and React/TypeScript (frontend) * AI\-native delivery practices applied across the CDLC * A clear leaning toward front\-end or back\-end depth, with the ability to move fluidly across stack layers * Experience with AWS * Agent \& harness engineering fluency, with concrete evidence of building/operating this kind of tooling, not just using it. **Nice\-to\-Have Skills** * PostgreSQL **We offer\*:** * Flexible working format \- remote, office\-based or flexible * A competitive salary and good compensation package * Personalized career growth * Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more) * Active tech communities with regular knowledge sharing * Education reimbursement * Memorable anniversary presents * Corporate events and team buildings * Other location\-specific benefits * not applicable for freelancers