Senior NodeJS Backend Developer

Voicemod

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Location: Spain, Germany, United Kingdom, Portugal, Worldwide
Job Type: full-time
Salary: €55K – €70K
Posted: April 20, 2026

Job Description

About Voicemod ✨

At Voicemod, our mission is to enable people to supercharge their voice wherever they communicate, fostering self-expression and belonging. We create audio tools that let gamers, streamers, and content creators shape their online identity with voice changers, soundboards, and real-time effects. Millions of people use Voicemod every day to enhance their interactions and have fun.

We’re a team of 90+ people working remotely or from our Valencia HQ or our coworking space in Barcelona. We’re passionate about pushing the boundaries of audio and building products that make digital spaces more expressive and playful. At Voicemod, we care deeply about our people and users — if you share our passion, we’d love to meet you!

Our Values 💜

At Voicemod, our values are more than just words — they shape how we work every day:

🚀 Be Brave – Courage drives progress.
🏆 Show Ownership and Accountability – Impact begins with ownership.
🎸 Embrace Passion at Play – Passion builds success.
🤝 Grow Together – Go further by growing together.

As a Senior NodeJS Backend Developer, you will spearhead server-side logic, database management, and ensure optimal performance and responsiveness to frontend requests and client-side agents. You’ll also collaborate closely with our DevOps team to scale our infrastructure and services globally within our platform.

Our Tech Stack:

Express - Node.js
MongoDB
Redis
Google Cloud Platform
Kubernetes
GitLab

What You’ll Do 🎯

Develop robust backend services that integrate seamlessly with frontend functionality and client-side agents.
Engage and collaborate with stakeholders and the development team to capture requirements and design innovative features.
Optimise application services for speed, scalability, and stability.
Implement stringent security protocols, data protection measures, and efficient storage solutions.
Design and deploy data storage solutions, and integrate and unit and E2E test application services for quality assurance.
Create reusable code and libraries.

What you'll need ✅

5+ years of hands-on experience as a Backend Developer.
Proven track record in developing and consuming REST API Services, using SQL/NoSQL databases.
Expertise in writing clean, efficient code.
Understanding and application of testing methodologies like TDD and SOLID principles.
Proficiency in Docker containers, Kubernetes, Git version control, and CI/CD best practices.
Experience using data monitoring and analysis tools to optimize system performance.

Bonus Points 🦄

Experience with Terraform and MongoDB performance tuning
Knowledge of Mongo Atlas Search.
Experience using DDD and Clean architecture principles
Passion for audio, music, recording, or sound.

Hiring Process ⚙️

Our interview process takes place on Google Meet and tends to consist of the following stages:

1️⃣ Talent Acquisition Call – Get to know Voicemod and share your experience (45 min).
2️⃣ Hiring Manager Interview – Deep dive into your background and role expectations (60 min).
3️⃣ Technical Interview – Showcase your skills in a real-world task (Up to 120 min).
4️⃣ Final Interview – A conversation about soft skills and ways of working (60 min).

If you want to have a look on how to get a successful job application, have a look here!

Important Information for Applicants ⚠️

English Proficiency: A minimum of B2 level in English is required for this position. We will assess your communication skills during the initial interview.
Video Interview Requirement: All candidates invited for an interview must join with their cameras on. We request no use of virtual backgrounds during the interview.
Location Accuracy: Please provide accurate information about the country from which you will work. We value transparency and will verify this information during the selection process.

⚡ Don't meet 100% of the criteria?

Studies show that many people—especially from underrepresented backgrounds—tend to apply only when they meet every requirement. At Voicemod, we value potential and learning capacity. If you match at least 75% of the requirements, we encourage you to apply—skills can be developed, and we’d love to hear from you.

Why You’ll Love Working at Voicemod ❤️

Flexible Working Hours ⏰ – Adapt your job to your lifestyle. You do you!
Remote Working 🌍 – Choose to work from home, our Valencia HQ, or the coworking space in Barcelona.
23 vacation days 🌴 – Plus an extra week off in August and your birthday.
Anniversary Celebration Program 🎉 – Unlock extra days off, volunteering days, or time to enjoy unique experiences as you reach work milestones.
Generous Referral Program 💼 – Earn rewards for helping us find and hire amazing talent.
Extra time off on demand ⏳ – For those tough moments when you need a break.
Wellbeing 🏥 – Paid sick leave, maternity/paternity leave, and healthcare insurance.
Flexible Benefits Plan 💳 – Available for employees based in Spain, allowing you to optimize part of your salary (e.g., meals, transport, childcare) and save a significant amount of money each year.
Remote Stipend 💸 – To cover remote working costs.
Free English or Spanish lessons 📚 – From beginner to advanced levels.

🎯 Who is this job for?

This role fits a Senior Backend Engineer (Node.js) with 5+ years of experience building scalable, high-performance server-side systems. You need strong skills in Node.js (Express), REST APIs, databases (MongoDB/SQL), cloud infrastructure (GCP), and DevOps tools like Docker and Kubernetes, plus knowledge of testing practices and clean architecture . The candidate should be familiar with designing backend services, optimizing performance, ensuring security, and collaborating on distributed systems at scale.

💬 Potential Interview Questions

How would you design a scalable Node.js backend service to handle millions of real-time audio interactions?
I would use a microservices approach with Node.js and Express, leverage Redis for caching and Pub/Sub, and deploy on Kubernetes for horizontal scaling. Efficient load balancing and monitoring are critical for stability.
What strategies would you use to optimize performance in a Node.js application?
I would focus on non-blocking I/O, efficient database queries, caching with Redis, and profiling bottlenecks. Horizontal scaling and proper resource management are also essential.
How do you design and maintain RESTful APIs for high-traffic applications?
I ensure clear API contracts, proper versioning, and consistent error handling. Performance, security, and documentation are key to maintaining reliable APIs.
How would you approach database design using MongoDB and Redis in a distributed system?
I would use MongoDB for persistent storage with proper indexing and schema design, and Redis for caching and fast access. Data consistency and scalability considerations guide design decisions.
What are best practices for securing backend services in a cloud environment?
Implement authentication/authorization, encrypt sensitive data, validate inputs, and follow least-privilege access. Regular audits and monitoring help maintain security.
How do you ensure code quality and maintainability in a Node.js project?
I follow SOLID principles, write clean modular code, and enforce testing (unit and E2E). Code reviews and CI/CD pipelines ensure consistency and quality.
How would you design a CI/CD pipeline for a Node.js application deployed on Kubernetes?
I would automate build, test, and deployment stages using tools like GitLab CI, ensure containerization with Docker, and manage deployments via Kubernetes with rollback strategies.
What challenges arise when scaling backend services globally, and how do you address them?
Latency, data consistency, and fault tolerance are key challenges. I address them with distributed systems design, regional deployments, and caching strategies.
How do you monitor and debug production issues in backend systems?
I use logging, metrics, and monitoring tools to detect anomalies. Root cause analysis and quick iteration help resolve issues efficiently.
What is your experience with TDD and how does it improve backend development?
TDD ensures reliable, testable code and reduces regressions. It helps design better APIs and improves long-term maintainability.

📋 Job Summary

Voicemod is a fast-growing audio tech company building tools for gamers and creators to transform their voice and express themselves, used daily by millions worldwide. They are hiring a Senior Node.js Backend Developer to design and scale high-performance services using Node.js, Express, MongoDB, Redis, and Kubernetes, with a strong focus on APIs, scalability, and cloud infrastructure . This is a fully remote role across Europe with a salary range of €55K–€70K plus flexible hours, benefits, and learning opportunities. It’s a great chance to work on real-time, high-scale systems in a creative, user-focused product with a strong engineering culture.