Senior Backend Engineer

Scrambly

Poland · Full-time · Mid-Senior

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 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.

Key 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

5+ years of software engineering experience, with a strong focus on backend development
Strong proficiency in Node.js and modern frameworks like NestJS
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 (e.g., PostgreSQL), NoSQL (e.g., Redis) databases, and message queues (e.g., RabbitMQ, GCP Pub/Sub, Redis Pub/Sub)
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

Experience in a B2C startup that has scaled to millions of users
Basic proficiency in Go; able to read, write, and maintain basic Go services without starting to learn from scratch
Hands-on experience with React, capable of implementing basic UI features or internal tools independently

Benefits

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
Competitive compensation and flexibility
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

Key Skills

Ranked by relevance

containerization redis gcp message queues product design restful apis kubernetes postgresql terraform rabbitmq docker devops react nosql cloud cicd aws ui

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