Senior Backend Engineer (Node.js)

Scrambly S.r.l.; España; A distancia; EUR 70.000 - 110.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Paid vacation days

Paid days off

Paid sick leave

Maternity/Paternity leave

Fully remote

Descripción de la vacante

Scrambly S.r.l. is seeking a Senior Backend Engineer to help build the core systems behind Scrambly. You’ll work on user-facing product systems and the internal platform, solving scalability challenges for a global, adtech product.

You’ll design and maintain scalable Node.js/NestJS RESTful APIs, mentor engineers, and collaborate with Product, Design and QA to translate requirements into robust technical specs. This is a fully remote position with a fast-paced, value-driven engineering culture.

Formación

• 5+ years of software engineering experience, with a focus on Node.js.
• Excellent system design skills and a solid understanding of backend architecture, RESTful APIs, and distributed systems.
• Experience with cloud platforms (GCP preferred; AWS or Azure acceptable), containerization (Docker), and orchestration/IaC (Kubernetes, Terraform, Helm).
• Proficiency with relational (PostgreSQL) and NoSQL (Redis) databases, and message queues (RabbitMQ, Pub/Sub).
• Hands-on experience with React for internal tools and strong English (B2+) communication.

Responsabilidades

• Architecture & Development: Design, build, and maintain highly scalable Node.js (NestJS) RESTful APIs and distributed systems.
• Quality & Mentorship: Champion clean, testable code standards and mentor engineers through code reviews and pair programming.
• Infrastructure & Performance: Monitor reliability, resolve bottlenecks, manage container lifecycles, and optimize CI/CD with DevOps.
• Cross-Functional Collaboration: Partner with Product, Design, and QA to translate requirements into robust technical specs and communicate constraints to non-technical stakeholders.

Conocimientos

Node.js

NestJS

RESTful APIs

Distributed systems

Cloud platforms

Docker

Kubernetes

Terraform

Go (basic)

PostgreSQL

Redis

RabbitMQ / Pub/Sub

React (internal tools)

English (B2+)

Herramientas

Terraform

Helm

Docker

Kubernetes

GCP

AWS

Azure

PostgreSQL

Redis

RabbitMQ

Descripción del empleo

About The Company

Scrambly is one of the fastest-growing adtech startups in the world, featured in the AppsFlyer Performance Index and Singular ROI Index in just 3.5 years. We’re growing 250%+ YoY across revenue, team, product, and technology - fully bootstrapped and profitable. We’re building the future of app discovery: a reward-powered alternative to the App Store and Google Play. Our loyalty-driven ecosystem connects millions of users with the world’s top apps and delivers unmatched, ROI-focused growth for mobile advertisers. Our mission is to build a true alternative to traditional app stores - fueled by rewards and data - and create a new, performance-first growth engine for mobile app advertisers.

About The Role

We are looking for a Senior Backend Engineer to join the team building the core systems behind Scrambly. In this role, you will work across two key areas: user-facing product systems - solving complex scalability challenges for a platform serving millions of users globally - and the internal platform, covering admin systems, tooling, and back-office automation that power our operations team. 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.

Key Responsibilities

• Architecture & Development: Design, build, and maintain highly scalable Node.js (NestJS) RESTful APIs and distributed systems. Ensure seamless frontend integration and drive long-term architectural improvements.
• Quality & Mentorship: Champion clean, testable code standards and foster a culture of technical curiosity by mentoring engineers through code reviews and pair programming.
• Infrastructure & Performance: Monitor system reliability, resolve bottlenecks, manage containerized application lifecycles, and partner with DevOps to optimize CI/CD pipelines.
• Cross-Functional Collaboration: Partner with Product, Design, and QA to translate requirements into robust technical specs, while clearly communicating technical constraints to non-technical stakeholders.

Requirements

• Experience: 5+ years of software engineering experience, with a strong focus on 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).
• Frontend Autonomy: Hands-on experience with React, capable of implementing basic UI features for internal tools independently.
• Collaboration: Strong communication and collaboration skills, comfortable working in a fast-paced team environment.
• English: Upper-Intermediate or higher (B2/B2+, written and spoken). You need to be able to communicate clearly in English to work effectively in an international team and participate in architectural discussions.

Nice to Have

• 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.

What 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 based on the country of your stay.