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Carlos Reinoso
From United Kingdom 04:58 AM (GMT+01:00)
$60/hr or $80,000/yr

Active 1 hour ago


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Senior Full-Stack Engineer

Full-Stack Engineer
Available for hire
Years of experience
7+ years
Experience level
Senior
Available for
Full-time, Part-time, Contract
Available from
08 Oct 2026

I've been a full-stack software engineer for over 7 years, building scalable web applications using React, Next.js, TypeScript, Python, and Node.js. I've delivered production-ready applications, automated business processes, and built tools that improve efficiency and user experience.

I'm looking for a backend-focused or full-stack engineering role where I can tackle meaningful technical challenges, take ownership of products, and continue growing my expertise in AI and scalable systems.

What sets me apart is my combination of technical versatility, independent problem-solving, and adaptability. My experience in both software engineering and the British Army has strengthened my discipline, resilience, and ability to perform under pressure while working effectively with others.

Employment History

Full-Stack Software Engineer at CriticalRiver Inc 2024 - 2026
• Built and maintained production applications with React, TypeScript, Python and FastAPI, owning features across frontend, API, database and deployment layers. • Designed reusable React and TypeScript application flows, including component architecture, form handling, state management and responsive interfaces integrated with backend services. • Implemented FastAPI services and REST endpoints for application workflows, authentication, data processing and third-party integrations, including validation, error handling and data transformation. • Modelled and queried application data in PostgreSQL and Elasticsearch, supporting structured data, search-oriented workflows and operational reporting. • Developed internal scheduling, reporting and workflow tools that connected user interfaces with backend automation and persistent data stores, reducing reliance on repetitive manual processes. • Containerised applications with Docker and supported repeatable development and deployment environments across frontend, backend and supporting services. • Diagnosed production issues across browser behaviour, API responses, logs, database queries and infrastructure configuration while contributing to decisions on service boundaries, API contracts, data access and maintainability.
Web Application Engineer at NEXT plc 2023 - 2024
• Developed server-rendered Node.js application components in a large retail technology environment, integrating frontend behaviour with backend services and structured application data. • Implemented and maintained server-side logic for page rendering, data retrieval and integration between web experiences and backend systems. • Automated recurring technical and operational tasks with PowerShell and ActiveBatch, creating repeatable scheduled workflows. • Worked extensively with SQL Server and SSMS across CRUD operations, schema investigation, query troubleshooting and role-based database access. • Contributed throughout Agile delivery cycles, including sprint planning, implementation, testing, issue investigation and stakeholder collaboration.
Frontend Software Engineer at Raindrop 2021 - 2023
• Built reusable Next.js components for Salesforce-based internal tooling, aligning frontend experiences with established business workflows and platform constraints. • Developed an email templating application that shifted template management from a Scala backend workflow to an operations-owned frontend system, giving operational users direct control and shortening turnaround for routine template changes. • Integrated a headless CMS with Next.js, enabling marketing users to manage website copy without developer-led code changes for routine content updates. • Migrated Material UI components from MUI 4 to MUI 5 across legacy applications, resolving component API, styling and regression issues while maintaining existing behaviour. • Prototyped internal operational workflows with no-code tools before custom implementation, helping validate requirements and reduce unnecessary engineering effort.
Web Solutions Developer at Apples and Pears Holdings 2020 - 2021
• Configured internal software and CRM workflows for a five-person professional services team, supporting client onboarding and day-to-day operational processes. • Led one-to-one client discovery sessions and translated business requirements into practical website structures, content flows and platform configurations. • Built responsive WordPress websites with Elementor and integrated Thinkific for online course and workshop delivery.

Education

Diploma, Web Development at BrainStation 2021 - 2021
Philosophy studies at University of Warwick 2015 - 2016