> Markdown version of [/jobs/ext/1679925-full-stack-engineer-senior-lead-id38801](https://www.wearedevelopers.com/jobs/ext/1679925-full-stack-engineer-senior-lead-id38801). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Full Stack Engineer (Senior/Lead) Id38801 - **Company:** Agileengine - **Location:** Barcelona, Spain (Remote available) - **Contract:** Permanent contract - **Skills:** Artificial Intelligence, Mobile Application Development, Information Technology Consulting, Mobile Application Software, Node.Js, Software Engineering, ReactJS, Firebase, Information Technology, Low Latency, React Native - **Published:** July 21, 2026 - **Apply:** https://www.buscojobs.com.es/full-stack-engineer-senior-lead-id-38801-en-barcelona-ID-363421312 ## About the Role Overview We are looking for a Senior Full Stack Engineer to join a fast-growing health and wellness platform with millions of users worldwide. You'll work in a cross-functional, agile team, building and improving features for both web and mobile applications. This role offers the opportunity to enhance performance, deliver seamless user experiences, and make a real impact on a product that helps people reach their wellness goals. What you will do Work independently and provide guidance to other team members; Ensure smooth operation and performance of both web and mobile applications; Identify, troubleshoot, and resolve bugs efficiently; Design, develop, and implement new features across web and mobile platforms. MUST HAVES 5+ years of experience building scalable systems; Solid experience with ReactJS, NodeJS for web, and React Native for mobile development; Proven ability to deliver solutions with high throughput and low latency requirements ; Demonstratedexperience designing and implementing complex business solutions ; Ability to develop features independently without design guidance, taking ownership from concept to implementation; Upper-Intermediate English level. NICE TO HAVES Experience in Startups; Experience with Firebase Functions . PERKS AND BENEFITS Professional growth: Accelerate your professional journey with mentorship, TechTalks, and personalized growth roadmaps. ## Description Full Stack Engineer (Senior/Lead) ID***** AgileEngine is an Inc. **** company that creates award-winning software for Fortune 500 brands and startups across 17+ industries.We rank among the leaders in areas like application development and AI/ML, and our people-first culture has earned us multiple Best Place to Work awards.Overview We are looking for a Senior Full Stack Engineer to join a fast-growing health and wellness platform with millions of users worldwide.You'll work in a cross-functional, agile team, building and improving features for both web and mobile applications.This role offers the opportunity to enhance performance, deliver seamless user experiences, and make a real impact on a product that helps people reach their wellness goals.What you will do Work independently and provide guidance to other team members; Ensure smooth operation and performance of both web and mobile applications; Identify, troubleshoot, and resolve bugs efficiently; Design, develop, and implement new features across web and mobile platforms.MUST HAVES 5+ years of experience building scalable systems; Solid experience with ReactJS, NodeJS for web, and React Native for mobile development; Proven ability to deliver solutions with high throughput and low latency requirements ; Demonstratedexperience designing and implementing complex business solutions ; Ability to develop features independently without design guidance, taking ownership from concept to implementation; Upper-Intermediate English level.NICE TO HAVES Experience in Startups; Experience with Firebase Functions .PERKS AND BENEFITS Professional growth: Accelerate your professional journey with mentorship, TechTalks, and personalized growth roadmaps.Competitive compensation: We match your ever-growing skills, talent, and contributions with competitive USD-based compensation and budgets for education, fitness, and team activities.A selection of exciting projects: Join projects with modern solutions development and top-tier clients that include Fortune 500 enterprises and leading product brands.Flextime: Tailor your schedule for an optimal work-life balance, with options for working from home or going to the office.Details Seniority level: Mid-Senior level Employment type: Full-time Industries: IT Services and IT Consulting Referrals increase your chances of interviewing at AgileEngine by 2x.Get notified about new Full Stack Engineer jobs in Barcelona, Catalonia, Spain .#J-*****-Ljbffr ## Related Videos - [Stop using Node.js like in 2020! What changed and what you can do today with Node.js](https://www.wearedevelopers.com/videos/100011-stop-using-node-js-like-in-2020-what-changed-and-what-you-can-do-today-with-node-js) - [Watch Tests Go Brrrr! : Getting Started with Cypress in ReactJS](https://www.wearedevelopers.com/videos/282-watch-tests-go-brrrr-getting-started-with-cypress-in-reactjs) - [Intro to Flutter Development](https://www.wearedevelopers.com/videos/170-intro-to-flutter-development) - [Build and Deploy a Fullstack App with Open Source Tooling](https://www.wearedevelopers.com/videos/775-build-and-deploy-a-fullstack-app-with-open-source-tooling) - [Stop Using Node.js Like It’s 2020! - Alfonso Graziano](https://www.wearedevelopers.com/videos/1863-stop-using-node-js-like-it-s-2020-alfonso-graziano) - [Your next 10x engineer isn't in your city. Refactor accordingly.](https://www.wearedevelopers.com/videos/100103-your-next-10x-engineer-isn-t-in-your-city-refactor-accordingly) ## Related Articles - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [Find a Developer Job: 12 Best Job Sites For Developers](https://www.wearedevelopers.com/magazine/165-find-a-developer-job-12-best-job-sites-for-developers) - [Where To Find Software Engineering Jobs](https://www.wearedevelopers.com/magazine/396-where-to-find-software-engineering-jobs) - [7 Most Popular Web Developer Jobs in Europe](https://www.wearedevelopers.com/magazine/163-7-most-popular-web-developer-jobs-in-europe) - [Where to Find Entry-Level Software Engineering Jobs](https://www.wearedevelopers.com/magazine/397-where-to-find-entry-level-software-engineering-jobs) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated)