Senior Node.js Engineer

Commit; Warszawa; On-site; PLN 180,000 - 300,000; Full time

Job summary

Commit seeks a Senior Node.js Engineer to lead the design, implementation, and scaling of high-performance systems in a cloud-first environment. You will architect complex Node.js applications, drive microservices and data pipelines, and work with AWS to ensure reliability and throughput.

As a senior member, you will mentor junior developers, optimize code for low latency, and contribute to the evolution of our data platforms in a fast-paced, collaborative setting.

Qualifications

• 4+ years of Back end development experience.
• Proven track record building APIs and microservices.
• Strong proficiency with JavaScript and Node.js (Express or similar).
• Experience with asynchronous programming and scalable design principles.
• Familiarity with Redis, MongoDB, and queuing systems (RabbitMQ, SQS, Gearman).
• Experience with AWS and GCP, Linux, and CI/CD processes.
• Knowledge of Kubernetes and related tooling (Helm, ArgoCD, Prometheus) is a bonus.

Responsibilities

• Architect and lead high-performance, scalable Node.js applications and microservices in a cloud environment (AWS).
• Design data pipelines and big data processing systems across operational/analytic platforms.
• Mentor junior developers and drive code quality, testing, and best practices.
• Develop and maintain robust CI/CD pipelines and cloud infrastructure configurations.

Skills

JavaScript

Node.js

API development

Microservices

Express

Async programming

Scalability design

Git

CI/CD

Cloud (AWS/GCP)

Linux

Tools

AWS

GCP

Kafka/MSK

SQS

RabbitMQ

Gearman

Redis

MongoDB

Kubernetes

Helm

ArgoCD

Prometheus

Job description

We are seeking a highly experienced Senior Node.js Engineer to join our growing engineering team. As a senior member of our team, you will take on a leadership role in designing, implementing, and scaling highly performant systems. You will work with cloud infrastructure, primarily AWS, and build robust microservices, Big Data processing services, and data platforms that support high-load, real-time applications.

You will be responsible for architecting complex systems, ensuring scalability and efficiency while also providing mentorship to junior developers. This is an exciting opportunity for a self-driven, technically versatile engineer who is comfortable working independently and thrives in a fast-paced, collaborative environment.

Key Responsibilities

• Architecture & Design: Lead the architecture and design of high-performance, scalable, and fault-tolerant Node.js applications, microservices, Big Data processing systems, and data pipelines running in a cloud environment (primarily AWS).
• Cloud Infrastructure: Utilize AWS services such as EC2, Lambda, RDS, S3, Kafka/MSK, SQS, and others to ensure that applications and data platforms are highly available, secure, and performant.
• Microservices & Event-Driven Systems: Build and manage distributed, high-load microservices and event-driven architectures that can scale effectively and handle large volumes of concurrent traffic and data.
• Data Infrastructure: Design and develop integrations and Big Data processing pipelines that ingest, transform, and distribute large volumes of data across operational and analytical systems.
• High-Performance Systems: Optimize Node.js applications and data processing workloads for performance under high load, ensuring minimal latency and maximum throughput.
• Multithreading: Implement advanced multithreading techniques to enhance system performance and concurrency.
• Code Quality & Best Practices: Write clean, maintainable, and efficient code while adhering to industry best practices and design patterns.

Requirements

• 4+ years of Back end development
• In-depth knowledge and experience developing API’s and microservices
• Strong proficiency with JavaScript, and Knowledge of Node.js and frameworks available for it (such as Express or equivalent)
• Understanding the nature of asynchronous programming and its quirks and workarounds
• Understanding fundamental design principles behind a scalable application
• Experience working with various data storage solutions such as Redis, MongoDB, etc.
• Experience working with Queuing solutions such as gearman, RabbitMQ, SQS, etc.
• Implementing automated testing modules and unit tests
• Proficient understanding of code versioning tools, such as Git
• Experience with cloud services such as AWS and GCP
• Experience working with Linux
• Experience with CI/CD processes
• Bonus - Familiarity with K8S, and related frameworks such as helm, Argo-cd, Prometheus, etc.