Senior Node.js Developer (High-load Systems) at BrainRocket

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• 🏢 BrainRocket has 19 jobs here, 15 with visa sponsorship see all
• 🛂 Visa: Highly Qualified Professional permit. Education: Higher education degree guide
• 💡 No salary shown. Ask BrainRocket if it is above the minimum.

Updated 2026-11-05, from our data and official sources.

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About the role

BrainRocket is a global company creating end-to-end tech products for clients across Fintech, iGaming, and Marketing. ‍Young, ambitious, and unstoppable, we've already taken Cyprus, Malta, Portugal, Poland, and Serbia by storm. Our BRO team consists of 1,300 bright minds creating innovative ideas and products. We don’t follow formats. We shape them. We build what works, launch it fast, and make sure it hits.   ❗️Please note that this role is office-based for Spain. ❗️If you need to be relocated, we take care of the process. ⚡ We are looking for an experienced Senior Node.js Developer to join our development team and help build and scale our High-load platforms. This is a hands-on role where you will design, code, and optimize high-performance systems with a heavy focus on database efficiency and scalability in a fast-paced environment. 🎯 Your Mission: Contribute to the design and development of scalable backend systems, ensuring robustness and high performance. Your mission involves not only building features but also deep-diving into database optimization, query performance, and big data management to ensure our infrastructure handles peak loads seamlessly. ✅ Responsibilities: ✔️ Develop and maintain in-house backend platforms using Node.js and Nest.js. ✔️ Optimize database performance by debugging queries, managing indexes, and utilizing data partitioning strategies. ✔️ Design and implement complex third-party API integrations. ✔️ Build new features and services from scratch within a microservices architecture. ✔️ Ensure system reliability by understanding and monitoring the DB planner and data normalization principles. ✔️ Manage and scale systems handling Big Data and high-load SQL/NoSQL databases. ✔️ Write clean, testable, and maintainable code following TDD and best practices. ✔️ Collaborate with cross-functional teams to deliver high-quality, high-performance solutions. ✅ Requirements: ✔️ Strong knowledge of JavaScript and the ECMAScript 6 standards. ✔️ 5+ years of commercial experience with Node.js and Nest.js. ✔️ 5+ years of commercial experience in web development. ✔️ High-load Database Expertise: Hands-on experience with Relational DBs and managing Big Data. ✔️ Good understanding of data organization (normalization, partitions) and the theory behind why these structures matter. ✔️ Strong understanding of table indexing (types and caveats) and the DB Query Planner. ✔️ Real experience with query debugging and performance improvement. ✔️ Commercial experience of working with high-load SQL or NoSQL databases. ✔️ Commercial experience of implementing the REST, GraphQL, and WebSockets. ✔️ Understanding of the TDD principles and experience of writing tests. ✔️ Understanding of microservice architecture principles. ✔️ Experience of GIT version control system. ✔️ Experience with RabbitMQ. ✔️ Experience with Redis. ✔️ Experience with databases MongoDB, MySQL. ✔️ At least an Intermediate level of English. ✅ Will be a plus: ✔️2+ years of hands-on experience developing over CI/CD/Micro Services architecture/Containers. ✔️Experience with Kubernetes. ✔️Experience with Nats. ✔️Experience with TypeScript. ✅ Recruitment Process: 1. Interview with the Recruiter: An introductory conversation to get to know you better, discuss your background, and align expectations about the role and the company. 2. Technical Assessment (HackerRank): A short coding challenge designed to evaluate your technical skills and problem-solving abilities. 3. Technical Interview: An in-depth discussion about your technical expertise, hands-on experience, and approach to solving real-world problems. 4. Final Interview with the Hiring Team: A conversation with team members and leadership to assess cultural fit, collaboration style, and alignment with the team’s goals. 5. Offer: If everything goes well, we’ll move forward with a formal offer to join our team. ✅ We offer excellent benefits, including but not limited to: 💻 Learning and development opportunities and interesting, challenging tasks. 📝 Official employment following Spain/EU laws, including registration of family members. ✈️ Relocation package (flight tickets + 2-week hotel stay). 📚 Language development support and partial compensation for classes. 🎁 Birthday celebration gift. 🏝 23 working days of Annual Vacation for proper rest. 🏋️‍♂️ Social Club and more than 50 events per year - coming soon. ⚖️ Competitive remuneration level with annual review. 🏄🏻‍♂️ Teambuilding activities. Bold moves start here. Make yours. Apply today!  By submitting your application, you agree to our Privacy Policy. [https://www.brainrocket.com/privacy-policy]

Responsibilities

The role involves in-house platform development and 3rd party API integrations. The developer will actively participate in developing new features from scratch.

Requirements

Candidates must have strong knowledge of JavaScript and over 5 years of experience with Node.js and web development. Experience with high loaded databases, REST, GraphQL, and microservice architecture is also required.

Key skills

• JavaScript — in 141 other listings on The Stack
• Node.js — in 172 other listings on The Stack
• Nest.js — in 6 other listings on The Stack
• Web Development — in 9 other listings on The Stack
• SQL — in 545 other listings on The Stack
• NoSQL — in 52 other listings on The Stack
• REST — in 32 other listings on The Stack
• GraphQL — in 90 other listings on The Stack
• WebSockets
• TDD
• Microservice Architecture
• GIT
• RabbitMQ
• Redis
• MongoDB
• MySQL

On The Stack (as of 2026-11-05)

• BrainRocket has 18 other listings on The Stack, 15 of them marked as offering visa sponsorship.
• 76 visa-sponsored jobs in Spain on The Stack, posted in the last 60 days.

Frequently asked questions about BrainRocket

Is this Senior Node.js Developer (High-load Systems) role still open?

It was posted on 2026-02-16. Listings more than 30 days old may no longer be active, so check BrainRocket's site before applying.

Where is this role located?

The listing gives the location as Valencia, Spain.

What skills does this role ask for?

The listing names: JavaScript, Node.js, Nest.js, Web Development, SQL, NoSQL, REST, GraphQL, WebSockets, TDD, Microservice Architecture, GIT, RabbitMQ, Redis, MongoDB, MySQL.