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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Back- End & Api Developer - **Company:** 360 Talent - **Location:** Madrid, Spain (Remote available) - **Salary:** €24,000.0 - €30,000.0 - **Contract:** Permanent contract - **Skills:** Flutter, Clean Code Principles, Application Programming Interfaces (APIs), Mobile Application Software, Rxjava, Software Engineering, Trello, RxJS, Backend, Integration Tests, Solid Principles, Reactive Programming, Bitcoin, Front End Software Development - **Published:** September 13, 2026 - **Apply:** https://www.buscojobs.com.es/back-end-api-developer-en-madrid-ID-371133605 ## About the Role And money shouldempower your dreams., The ideal candidatewill have strong software development skills and passion for delivering a highquality UX. Someone with a background in app development with 3+ years of frontendexperience, including some experience in Flutter, would make a great candidate. Experience working with mobile applications. Experience with Unit and Integration tests. Knowledge of SOLID principles, Clean Architectureand Clean Code practices. Nice to have: A CS degree. Experience with reactive programming like RXjs,RxSwift, RxJava, RxDart... Server side coding experience. ## Description About the CompanyDo you think that money can be better?Money should help lower or removeentry barriers to the market.Money should be universal.And money shouldempower your dreams.At HandCash we are creating a marketplace of apps and games where skills andgood content are rewarded, and startups make money since day one.Although our HQ is in Madrid, our team culture has been built around remotework (definitely is the future!).We are in our Spring, which is the most beautifuland important period as a start-up.Our team of talented, passionate andfearless people is constantly growing and looking for new members.Join us andlet's make a better money for the world!Founded in ****, we have become the most innovative and beloved start-up in thecurrent Bitcoin ecosystem.We are a focus-driven company, fearless to break thestatus-quo by building sophisticated yet simple products.Our work environment can be very demanding and fast paced, but at the same timewe encourage ownership and reward going the extra mile.It's time to build andgrow together.We believe in learning by doing, and that there is no betterclassroom than real-world experience.Creative problem-solving: Combine the differentperspectives (development, design, marketing, low,...).Solve the mostchallenging and hardest problems is in our DNA.The hardest challenges areoften the most rewarding.Empowering people: Help start-ups to build newbusiness models based on micropayments.Help content creators and talentedpeople to earn money.Bring opportunities to millions of people around theworld.The team culture of the future: We believe remotejobs are part of the future.It doesn't matter where you live, our teamworkflow has been built upon this new lifestyle.Responsibility based on goals.No micromanagement.Leadership based on what to do not how to do it.We envision a world where people are more connected and fairly rewarded.Wewant to make this dream possible and we need the most bright, ambitious andtalented people to join us!About the RoleWe are looking for a talented UX & App Developer (Frontend Developer)to create awesome user experiences in our Flutter apps.The ideal candidatewill have strong software development skills and passion for delivering a highquality UX.Someone with a background in app development with 3+ years of frontendexperience, including some experience in Flutter, would make a great candidate.Experience working with mobile applications.Experience with Unit and Integration tests.Knowledge of SOLID principles, Clean Architectureand Clean Code practices.Nice to have:A CS degree.Experience with reactive programming like RXjs,RxSwift, RxJava, RxDart...Server side coding experience.Team tools: Trello, Slack and GSuite.The good stuffWe're a company full of happy, motivated people and we never want that tochange.Here are some more reasons why it rocks to be part of our family.Remote job positions.Flexible work environment & hours.Regular team events, including barbecues everyfortnight.Congresses, workshops and meetups.Flexible remuneration: subsidized restauranttickets, transport tickets, healthcare and childcare.Monthly gym subscription included.Top Salary conditions at Engineering: Junior24k-30k, Mid 30k-43k, Senior 43k-55k, Lead 55k-70k.All the gear you need - just bring yourself.Obvious, but has to be mentioned - free coffee!#J-*****-Ljbffr ## Related Videos - [Intro to Flutter Development](https://www.wearedevelopers.com/videos/170-intro-to-flutter-development) - [Personal Branding for Top HR Professionals](https://www.wearedevelopers.com/videos/1471-personal-branding-for-top-hr-professionals) - [How to Create New RxJS Operators](https://www.wearedevelopers.com/videos/683-how-to-create-new-rxjs-operators) - [Starting business without breaking the bank: Self hosted OSS productivity ecosystem](https://www.wearedevelopers.com/videos/1219-starting-business-without-breaking-the-bank-self-hosted-oss-productivity-ecosystem) - [Practice makes perfect - when it comes to RxJS](https://www.wearedevelopers.com/videos/1-practice-makes-perfect-when-it-comes-to-rxjs) - [Using Serious Tech for a Silly Game - How to Build an MVP with Flutter](https://www.wearedevelopers.com/videos/728-using-serious-tech-for-a-silly-game-how-to-build-an-mvp-with-flutter) ## Related Articles - 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