Senior Software Engineer (SDK / Frontend), base, Remote, …, Sevilla

Overview Senior Software Engineer (SDK / Frontend), $200k-$280k base, Remote, Blockchain, DEX, Typescript, UI/UX, React, Next.JS We’re working with a well-funded, fast-scaling team building next-generation infrastructure for cross-chain execution, connecting AI agents, services, and financial applications across blockchain networks. They’re looking for a Senior Software Engineer to help build a blazing-fast frontend and developer SDK for a cross-chain DEX. This role sits at the intersection of product, developer experience, and complex blockchain infrastructure, focused on making advanced financial systems simple and intuitive to use. Responsibilities
- Building and optimising a high-performance frontend for a cross-chain DEX
- Developing a best-in-class SDK for external developers to integrate and build on top
- Designing clean, intuitive user experiences for complex financial workflows
- Working closely with protocol, backend, and design teams to bridge product and engineering
- Implementing observability and tracing across user journeys and interactions
- Building resilient state machines to manage RFQs and execution flows What they’re looking for
- Strong experience with TypeScript and modern frontend frameworks (React, Next.js)
- Proven track record shipping high-quality products end-to-end
- Strong eye for UI/UX and product detail
- Experience building platforms, SDKs, or developer tooling
- Comfortable working across frontend and backend when needed
- Familiarity with crypto, DeFi, or blockchain technologies Nice to have
- Experience with wagmi, XState, or similar tooling
- Exposure to cross-chain systems or DEX infrastructure
- Experience building mobile or multi-platform applications Postúlate en Kit Empleo: kitempleo.es/empleo/6u2c7l