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# Full Stack Engineer (Senior/Lead) Id38801

- **Company:** Agileengine
- **Location:** Barcelona, Spain (Remote available)
- **Contract:** Permanent contract
- **Skills:** Artificial Intelligence, Mobile Application Development, Mobile Application Software, Node.Js, Software Engineering, ReactJS, Firebase, Information Technology, Low Latency, React Native
- **Published:** October 31, 2026
- **Apply:** https://www.buscojobs.com.es/full-stack-engineer-senior-lead-id-38801-en-barcelona-ID-378848201

## About the Role

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
;
Demonstrated experience 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

## 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.OverviewWe are looking for aSenior Full Stack Engineerto 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 doWork 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 HAVES5+ years of experience building scalable systems;Solid experience withReactJS, NodeJSfor web, andReact Nativefor mobile development;Proven ability to deliver solutions withhigh throughput and low latency requirements;Demonstrated experience designing and implementingcomplex business solutions;Ability to develop features independently without design guidance, taking ownership from concept to implementation;Upper-Intermediate English level.NICE TO HAVESExperience in Startups;Experience withFirebase Functions.PERKS AND BENEFITSProfessional 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.DetailsSeniority level:Mid-Senior levelEmployment type:Full-timeIndustries:IT Services and IT ConsultingReferrals increase your chances of interviewing at AgileEngine by 2x.Get notified about new Full Stack Engineer jobs inBarcelona, Catalonia, Spain.#J-*****-Ljbffr