Full-Stack Engineer – Mobile, Web, Serverless

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Bigtoone

WebsiteLinkedInAll Job Openings

11 - 50 employees

🤝 B2B

☁️ SaaS

💳 Fintech

B2B • SaaS • Fintech

Bigtoone is a Madrid-based technology group focused on innovation and digital transformation. The company describes itself as developing disruptive technology solutions that lead change and prepare customers for a more competitive digital future. Bigtoone operates through multiple subsidiary brands (Ceroone Technology, AvanPyme, AvanUp, Dinq, ed[3], Juridit, Ebizu) and offers business-facing tools such as Subvfy, a public-funds searcher that helps companies and professionals locate grants and public capital for technology projects. The group positions itself around technology-driven progress, digitalization, and financial intelligence for businesses.

📋 Description

• Design and implement web, mobile, and interactive terminal applications on a unified backend. • Build and maintain the project's REST API and the data model in NoSQL environments. • Integrate payment gateways for both digital channels and physical terminals across multiple channels. • Develop a custom CMS focused on managing campaigns, rewards, and user loyalty. • Implement integrations and data synchronizations via REST with third-party systems (POS/ERP). • Work with agile methodologies and AI-assisted development tools (Claude Code, Cursor) as part of the daily productivity workflow.

🎯 Requirements

• More than 5 years developing and deploying digital products in real production environments. • Strong experience in at least two of the following three areas: • Mobile: Flutter • Web: Next.js / React • Backend: Node.js + TypeScript in serverless environments • Comfortable working with AWS (Lambda, API Gateway, DynamoDB, Cognito, S3) or equivalent technologies. • Hands-on experience connecting third-party APIs (payment gateways, ERPs, management systems). • Deployment automation and CI/CD using GitHub Actions. • Familiarity with AI-assisted development and strong technical judgment to review and audit autonomously generated code. • Languages: Fluent Spanish or English.

🏖️ Benefits

• Remote work • Flexible schedule compatible with the European time zone • Immediate start • Initial duration: ~75 working days (≈ 3.5 months)