Senior FullStack Developer

Jobgether; España; Remote; EUR 48,000 - 81,000; Full time

Benefits offered by this job

Fully remote from Poland

Competitive USD salary up to 90,000

Technical ownership

Senior engineering team interaction

Web3 innovation and trading tech

End-to-end project ownership

Professional growth in blockchain and栈

Job summary

Jobgether is seeking a Senior Full Stack Developer based in Spain to lead architecture and implementation across frontend, backend, and Web3 integrations. You will own end-to-end development for decentralized trading tools processing real-time data streams, collaborating with an experienced team to deliver scalable, secure systems from design to production.

The role emphasizes autonomy, technical ownership, and impact on core product architecture within a fast-paced startup environment.

Qualifications

• 10+ years of professional software development experience.
• A minimum of 3 years of full stack development with Web3 focus.
• Strong proficiency in TypeScript, React, and Node.js.
• Experience delivering Web3 applications to production environments.
• Hands-on experience integrating blockchain wallets, DeFi protocols, on-chain data sources, and third-party Web3 libraries or APIs.
• Proven experience designing and scaling data-intensive systems with real-time processing.
• Fluent English communication in distributed teams.
• High autonomy and accountability in a fast-moving startup.
• Experience with Ethereum and Solana is advantageous.
• Familiarity with Prisma, Zod, tRPC, and Fastify is a plus.

Responsibilities

• Lead end-to-end full stack development across React-based UIs, Node.js services, and Web3 integrations.
• Design, develop, and scale decentralized applications involving wallets, DeFi protocols, and on-chain data sources.
• Integrate Web3 libraries, SDKs, packages, and APIs into robust product workflows.
• Architect and implement high-performance, secure systems across decentralized ecosystems.
• Develop infrastructure capable of processing real-time market information and blockchain activity.
• Own the full software development lifecycle from design to production support.
• Investigate production issues, identify root causes, and implement reliability improvements.
• Collaborate with senior engineers on architectural decisions and research emerging Web3 technologies.
• Contribute to advanced trading and market intelligence products for high-performance UX.
• Maintain high engineering standards through careful decisions and ongoing improvements.

Skills

TypeScript

React

Node.js

Web3

Blockchain

Multi-chain

Ethereum

Solana

Prisma

Zod

tRPC

Fastify

Tools

Prisma

Zod

tRPC

Fastify

Job description

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Full Stack Developer based in Spain.

Join an innovative Web3 technology environment developing advanced market intelligence solutions and next-generation decentralized trading infrastructure. As a Senior Full Stack Developer, you will take ownership of architecture and implementation across frontend applications, backend services, and blockchain integrations. You will help build sophisticated trading tools that process hundreds of real-time data streams, transforming on-chain activity and market intelligence into actionable insights. Working with a highly experienced engineering team, you will design scalable, secure, and reliable systems while solving complex technical challenges across decentralized ecosystems. This role offers significant autonomy, broad technical responsibility, and the opportunity to influence core product architecture from design through production deployment. It is an ideal opportunity for an experienced engineer who thrives in a fast-paced startup environment and is passionate about building impactful Web3 products.

Accountabilities

• Lead end-to-end full stack development across React-based user interfaces, Node.js backend services, and Web3 integrations.

• Design, develop, and scale decentralized applications that integrate blockchain wallets, decentralized finance (DeFi) protocols, and on-chain data sources.

• Integrate Web3 libraries, software development kits, third-party packages, and APIs into robust, secure, and reliable product workflows.

• Architect and implement systems that meet demanding requirements for performance, scalability, security, and interoperability across decentralized ecosystems.

• Develop and optimize infrastructure capable of processing high volumes of real-time market information, blockchain activity, and other data streams.

• Take ownership of the entire software development lifecycle, from technical design and implementation through deployment, monitoring, and production support.

• Investigate complex production issues, identify root causes, and implement improvements that strengthen system reliability and operational performance.

• Collaborate with experienced engineers on architectural decisions, technical strategy, and research into emerging technologies relevant to Web3 and decentralized markets.

• Contribute to the development of advanced trading and market intelligence products, helping transform complex data into intuitive, high-performance user experiences.

• Maintain high engineering standards through thoughtful technical decisions, quality-focused implementation, and continuous improvement of development practices.

Requirements:

• At least 10 years of professional software development experience, with a strong background in designing, building, and maintaining production-grade applications.

• A minimum of 3 years of full stack development experience with a substantial focus on Web3 technologies and blockchain-based applications.

• Strong proficiency in TypeScript, React, and Node.js, with the ability to develop and maintain complex frontend and backend systems.

• Demonstrated experience delivering Web3 applications or integrations to production environments.

• Hands-on experience integrating blockchain wallets, DeFi protocols, on-chain data sources, and third-party Web3 libraries, packages, or APIs.

• Proven experience designing and scaling data-intensive systems, particularly those involving real-time processing and high-volume information flows.

• Strong architectural judgment and a practical understanding of system performance, security, scalability, and reliability.

• Ability to troubleshoot complex technical issues, make independent engineering decisions, and take responsibility for production outcomes.

• Excellent problem-solving skills, with the ability to balance rapid delivery against long-term maintainability and technical quality.

• Fluent English communication skills, with the ability to collaborate effectively with experienced engineers in a distributed environment.

• A high degree of autonomy, accountability, and initiative, along with the ability to manage broad responsibilities in a fast-moving startup.

• Comfort working in a demanding, execution-focused environment where engineers are expected to take ownership and deliver results with limited supervision.

• Experience with multi-chain development, particularly across Ethereum and Solana, is an advantage.

• Familiarity with Prisma, Zod, tRPC, and Fastify is considered a plus.

Benefits:

• Fully remote work: Work remotely from Poland with flexible working hours.

• Competitive compensation: Annual salary of up to USD 90,000, depending on experience and qualifications.

• Technical ownership: Significant autonomy in shaping architecture, making engineering decisions, and delivering core product capabilities.

• Experienced colleagues: Collaborate with a highly skilled, senior-level engineering team in a direct and execution-focused environment.

• Web3 innovation: Contribute to advanced decentralized applications, market intelligence infrastructure, and next-generation trading technologies.

• End-to-end responsibility: Own projects from initial design through implementation, deployment, and ongoing production support.

• Professional growth: Expand your expertise in blockchain integrations, real-time data infrastructure, decentralized finance, and scalable full stack engineering.

• Flexible collaboration: Benefit from a remote-first working model with a focus on meaningful output, technical excellence, and efficient communication.