Senior Software Engineer, Node.js

1inch; Madrid; On-site; EUR 50,000 - 70,000; Full time

Benefits offered by this job

Unlimited vacation days

Fully compensated for work gear

Annual team retreat at a top location

Job summary

A leading DeFi company based in Madrid is seeking a Senior Software Engineer to develop high-performance backend systems. This role involves working with Node.js and microservices in a hybrid setup. Candidates with experience in fintech or crypto projects will excel. The position offers competitive compensation, unlimited vacation days, and a supportive environment for innovation.

Qualifications

• Proficient in Node.js/TypeScript with strong SQL skills.
• Experience working in fintech, DeFi, or crypto projects.
• Experience with microservices architecture in a high-load environment.

Responsibilities

• Design and implement scalable microservices and high-performance APIs.
• Monitor metrics and set up alerting systems.
• Participate in code reviews and architecture discussions.

Skills

Node.js

TypeScript

PostgreSQL

Redis

Monitoring tools

Blockchain fundamentals

Docker

Event-driven architecture

Tools

CI/CD pipelines

Kubernetes

Job description

Overview

1inch is the DeFi ecosystem building financial freedom for everyone. 1inch products help users and builders trade, hold and track digital assets with self-custody, comprehensive security and an intuitive user experience. 1inch protocols and APIs provide core infrastructure across the DeFi industry and beyond.

If you’re someone who thinks big, moves fast and wants to make an impact right from day one, join our industry-changing team. Location: We hire with a focus on Dubai and Europe. For this role, we prefer candidates who are either based in Dubai or working remotely within +/- 4 hours GST time.

We’re looking for an enterprise-oriented Senior Software Engineer with a focus on structure and scalability. You’ll be responsible for developing high-performance, scalable backend systems for our core infrastructure, including services like History, Tokens, Prices, and BFF. This role requires expertise in the Node.js ecosystem (Nest.js), as well as experience with microservices architecture and various storage and monitoring tools. You’ll need a basic knowledge of blockchain technologies and be comfortable working in a Scrum-based, agile environment. The position is based on a hybrid schedule, with a minimum of three days per week on-site in our Dubai office.

Responsibilities

• Designing and implementing scalable microservices and high-performance APIs using Nest.js
• Ensuring low latency and high throughput in service architecture
• Writing clean, maintainable, and well-documented code while following internal coding standards
• Monitoring technical and business metrics and setting up alerting systems for early incident detection
• Performing regular profiling and system performance analysis to optimise backend components, including database queries and response times
• Participating in code reviews and engaging in architecture discussions and sprint planning sessions
• Promoting best engineering practices across the team
• Ensuring backend systems are secure, scalable, and resilient
• Applying industry best practices for data protection and system design
• Proactively identifying and mitigating system vulnerabilities
• Staying updated with emerging backend technologies and introducing new tools and practices to enhance team efficiency
• Continuously seeking ways to improve system architecture and performance

Requirements

• Previous experience working in fintech, DeFi, or crypto projects
• Experience with microservices architecture in a high-load environment
• Experience setting up and managing metrics pipelines and alerting systems

Skills

• Proficient in Node.js/TypeScript with strong SQL skills and PostgreSQL experience
• Familiar with Redis, message brokers (e.g. NATS, EMQX, Kafka), and monitoring tools (Prometheus, Grafana)
• Good understanding of blockchain fundamentals, Web3, and Solidity
• Knowledge of CI/CD pipelines, Docker, and basic Kubernetes concepts
• Strong problem-solving abilities, proactive communication, and quality-driven mindset

Nice To Have

• Nest.js
• Knowledge of event-driven architecture
• Knowledge of Web3 libraries (ethers.js, web3.js) for blockchain interactions

Why you’ll love working with us

• Join a young, creative team in a fast-paced and supportive environment
• We’re open to new ideas — pitch your vision and make it happen
• Competitive pay that matches your skills and experience
• Be part of a company that’s shaping the future of DeFi
• Unlimited vacation days when you need it
• Fully compensated for your work gear
• Annual team retreat at a top international location

Job Details

• Seniority level: Not Applicable
• Employment type: Full-time
• Job function: Information Technology
• Industries: Transportation, Logistics, Supply Chain and Storage