Fullstack Developer

Fundraise Up

Fullstack Developer building and scaling features for a global fundraising platform at Fundraise Up. Leveraging expertise in Node.js, React, and TypeScript to enhance user experience.

Posted 6/22/2026full-timeRemote • 🇪🇸 SpainSeniorLead💰 €4,900 - €6,100 per monthWebsite

Tech Stack

Tools & technologies

JavaScriptNode.jsReactVue.jsWebpack

About the role

Key responsibilities & impact

Design, build, and maintain resilient frontend and backend features using React and Node.js.
Develop our core products, including donation checkouts, embeddable widgets, and donor/partner portals.
Architect and develop system components that scale across millions of monthly transactions.
Write clean, well-documented, and thoroughly testable code.
Drive architecture and technical design discussions to find elegant solutions to complex problems.
Mentor peers by conducting thoughtful code reviews and providing constructive feedback.
Partner with product managers and designers to clarify requirements and shape the roadmap.
Proactively identify and resolve bugs, performance bottlenecks, and optimization opportunities.
At Fundraise Up, AI is a default tool, not an experimental one. We expect every team member to actively use AI in their day-to-day work, identify where AI can change the shape of problems in their function, and grow their fluency as the tools evolve. You should already be using AI meaningfully in your work and understand where it adds value and how it can improve the way you operate.

Requirements

What you’ll need

7+ years of professional fullstack development experience.
Deep understanding of modern JavaScript (event loop, closures, promises, prototypes).
Expert-level proficiency with React and its ecosystem (familiarity with Vue is a plus).
Strong backend expertise with Node.js (experience with Koa or NestJS is highly preferred).
Experience with Webpack configuration, performance optimization, and profiling.
A keen eye for detail and a high sense of ownership and accountability for your work.

Benefits

Comp & perks

Private medical insurance for the employee and their family.
23 paid vacation days per year.
11 paid public holidays per year.
5 company-paid sick leave days.
English learning courses.
Relevant professional education.
Gym or swimming pool.
Home Office Setup Assistance: the company offers assistance with purchasing furniture (office chair, office desk, monitor) and other items to create a comfortable workspace.
Co-working.
Remote working.

ATS Keywords

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Hard Skills & Tools

JavaScriptReactNode.jsKoaNestJSWebpackperformance optimizationcode reviewAI fluencyfullstack development

Soft Skills

mentoringproblem-solvingattention to detailownershipaccountabilitycommunicationcollaborationtechnical designconstructive feedbackproactive identification