• Design, build, and maintain full-stack features across our SaaS platform. • Develop and optimize APIs (client & server side), including working with messy or poorly documented partner integrations. • Write clean, well-tested, and well-documented code (unit and integration testing). • Collaborate with teammates on architecture, design reviews, and code reviews. • Contribute to shared resources like onboarding guides, runbooks, and documentation. • Identify and resolve performance issues, especially around SQL queries and scaling workloads in AWS. • Experiment with AI tools and approaches — both to accelerate development and to inform our proprietary AI-enabled product.

• As part of a team of senior engineers, design, develop, and grow the Lingo.dev products • Web applications - Routing, navigation, onboarding flows, user experience, performance • Open source tools - CLI, webpack/vite plugins • Backend APIs - encapsulation, API design, security • Database layer (PostgreSQL) • Integrations - with 3rd party systems • AI agents • Take full ownership of features from design to deployment: draft technical designs, review with founders + the team, implement end-to-end with tests and documentation • 3 sprints of product roadmap work, 1 cooldown sprint (customer feature requests, improvements, bug fixes) • Weekly Demo Days with the rest of the team

• Design, build, and maintain end-to-end features across backend (ledger, routing services) and frontend (React-based UI). • Implement and evolve production-grade APIs, data models, and integrations for a high-throughput financial system. • Own the full lifecycle of features: design, implementation, testing, deployment, and ongoing reliability in production. • Collaborate closely with the VP of Engineering, founders, and other engineers to translate product requirements into technical designs and delivery plans. • Improve performance, scalability, and observability of the platform through profiling, tuning, and better monitoring. • Contribute to engineering standards, code reviews, and technical decision-making in a fast-paced startup environment.

Role Description Our client in the UK is seeking a highly capable full stack developer with strong expertise in the Microsoft technology stack along with PHP, HTML & CSS and specializing in building robust, scalable, and maintainable server-side and client-side applications and websites. The ideal candidate should have good knowledge of SQL, create efficient API endpoints, whilst ensuring performance and reliability across complex systems. Skilled at navigating both modern .NET environments and undocumented legacy codebases, with a strong focus on clean architecture, debugging, and long-term maintainability. Knowledge of WordPress is also highly desirable. Reporting to the IT & Development Manager, the successful candidate will work closely with the Projects Team to support the delivery of new opportunities and ongoing business changes across multiple functions and departments. Qualifications - 5+ years of commercial experience as a frontend, backend or full stack developer. - Experience in a regulated or financial services environment is beneficial. - Awareness of secure coding practices and understanding of data protection principles (UK GDPR or equivalent). - Strong experience with SQL and Restful API’s. Requirements - VB.NET (Framework and .NET Core/6+) - Experience developing, maintaining, and refactoring backend systems using VB.NET across legacy and modern environments. - PHP - Experience developing, maintaining, and refactoring backend systems using PHP. - Front-End Skills (HTML, CSS, vanilla JS/JQuery) - Familiarity with UI structure and styling, enabling effective collaboration with other members of the front-end team. - Microsoft SQL Server (CRUD Operations) - Proficient in designing and maintaining SQL databases and performing optimized CRUD interactions. - RESTful API Development - Experienced in designing and implementing endpoints, integrating external services, and ensuring API reliability and security. - Debugging & Performance Profiling - Strong troubleshooting skills to identify and fix bottlenecks in .NET and SQL layers along with PHP scripts. Benefits - UX Understanding - Ability to assess and provide input on improving user flows and overall experience. - ASP.NET - Knowledge in creating server-side web applications, handling routing, middleware, and backend logic. - Experience of version control (GitHub/Azure DevOps) - Comfortable working with modern Git workflows, branching strategies, and CI/CD pipelines. - AI & Automation Technologies - Exposure to AI-focused tools and libraries (e.g., integrating LLM APIs for data classification or document processing). Soft Skills - Legacy Code Adaptability - Adept at navigating, understanding, and improving undocumented or outdated codebases. - Strong Documentation Practices - Maintains clear, concise technical documentation to support team knowledge and long-term project stability. - Collaborative Work Style - Works effectively in team environments, especially during code reviews, design discussions, and version control processes. Contribution to our SCRUM meetings is expected. - Communication - Have good communication skills with the ability to help non-technical professionals understand requirements, issues, ideas etc.