Senior Backend Engineer

About us
Scrambly is the most rapidly growing Italy-based tech startup operating in the performance marketing and rewarded advertising space. Our platform helps users discover and test new apps, games, and services - and get rewarded for it. With millions of installs, we’re focused on scaling our mobile product and building a seamless user experience.

Now we are looking for a Senior Backend Engineer to join the team building the core systems behind Scrambly. In this role, you will be solving complex scalability challenges for a platform serving millions of users globally.
Your focus will be on writing robust, high-performance code and bridging the gap between product requirements and technical reality. You will work within a modern tech stack to ensure our systems remain fast, reliable, and easy to maintain as we grow.

You will focus on:

• Designing and building high-performance services.
• Architecting scalable and maintainable backend systems.
• Mentoring engineers and elevating code quality standards.
• Identifying bottlenecks and optimizing system performance.
• Collaborating with DevOps to streamline infrastructure and deployments.
• Bridging the gap between complex technical constraints and product goals.

Responsibilities

• Design & Implementation: 
  • Design, build, and maintain high-performance, scalable backend services and APIs using Node.js (NestJS).
  • Write clean, maintainable, and testable code that serves as a benchmark for the team.
  • Ensure seamless integration between backend services and frontend applications.
• Architecture & Technical Strategy:
  • Propose and implement architectural improvements for core systems.
  • Design complex features with a focus on long-term scalability, extensibility, and maintainability.
  • Apply best practices for distributed systems and RESTful API design.
• Mentorship & Code Quality: 
  • Champion high code quality and engineering best practices across the team.
  • Mentor other engineers through constructive code reviews, technical guidance, and pair programming.
  • Foster a culture of technical curiosity and continuous improvement.
• Performance & Infrastructure: 
  • Monitor system performance, identify bottlenecks, and proactively resolve reliability issues.
  • Collaborate with DevOps to ensure smooth CI/CD pipelines, deployments, and infrastructure reliability.
  • Work with containerization and orchestration tools to manage application lifecycles.
• Cross-functional Collaboration: 
  • Work closely with Product, Design, Frontend, and QA teams to deliver high-quality features.
  • Translate product requirements into robust technical specifications.
  • Communicate technical constraints and trade-offs clearly to non-technical stakeholders.

Requirements

• Experience: 5+ years of software engineering experience, with a strong focus on backend development.
• Tech Stack: Strong proficiency in Node.js and modern frameworks like NestJS.
• System Design: Excellent system design skills and a solid understanding of backend architecture, RESTful APIs, and distributed systems.
• Infrastructure: Experience with cloud platforms (GCP preferred; AWS or Azure acceptable), containerization (Docker), and orchestration/IaC (Kubernetes, Terraform, Helm).
• Databases & Messaging: Proficiency with relational (e.g., PostgreSQL), NoSQL (e.g., Redis) databases, and message queues (e.g., RabbitMQ, GCP Pub/Sub, Redis Pub/Sub).
• Collaboration: Strong communication and collaboration skills, comfortable working in a fast-paced team environment.
• Huge Plus:
  • Scale: Experience in a B2C startup that has scaled to millions of users.
  • Additional Stack: Basic proficiency in Go; able to read, write, and maintain basic Go services without starting to learn from scratch.
  • Frontend Autonomy: Hands-on experience with React, capable of implementing basic UI features or internal tools independently.

We offer

• Work on systems where performance optimizations translate to immediate user impact for millions of users
• A culture of code reviews, knowledge sharing, and mentorship where the best idea wins
• A fast-paced environment where your code quickly translates into real user value
• We value the stability and value of what you ship, not just the number of lines of code
• Full-time & fully remote position
• 15 days of paid vacation days
• 5 days of paid days off
• 5 days of paid sick leave
• Maternity/Paternity leave
• National holidays by the country of your stay
• An annual allowance of $100 for self-improvement activities