Offer summary

Qualifications:

4+ years of experience in backend development with Ruby on Rails., Strong understanding of PostgreSQL and relational data modeling., Familiarity with AWS serverless services like Lambda and DynamoDB., Experience with external API integration and security best practices..

Key responsibilities:

Develop and maintain a modular, scalable SaaS platform using Ruby on Rails.

Implement new features and collaborate with product and design teams.

Integrate external API services ensuring their secure and stable operation.

Participate in QA processes and contribute to code quality through testing and reviews.

Job description

3Commas is a leading platform for crypto trading automation. We’re building a modular SaaS product that helps traders worldwide scale their strategies, connect with exchange APIs, and automate routine tasks.

We’re looking for a backend engineer with strong Ruby on Rails experience and a product-oriented mindset. You’ll be responsible for designing secure, scalable features, integrating external APIs, and ensuring performance and quality from day one.

Responsibilities:

Develop and maintain a modular, scalable SaaS platform using Ruby on Rails.
Implement new features and improve existing ones in close collaboration with product and design teams.
Integrate external API services and ensure their secure and stable operation.
Take ownership of your code in production: monitoring, alerting, and ongoing support.
Participate in QA processes from the early stages (“shift-left” approach).
Contribute to code quality through automated tests, code reviews, and refactoring.
Actively collaborate with cross-functional teams, including DevOps and QA.
Stay up to date with best practices in backend architecture, security, and performance.

Requirements:

4+ years of experience in backend development with Ruby on Rails.
Strong understanding of PostgreSQL and relational data modeling.
Familiarity with AWS serverless services (e.g., Lambda, DynamoDB).
Experience with key-value storage (Redis, Memcached, etc.).
Solid grasp of software development best practices: TDD, CI, clean code, refactoring.
Experience integrating external APIs and handling third-party service interactions.
Understanding of security, scalability, and performance concerns in backend systems.
Willingness to engage in testing and QA — quality is everyone’s responsibility.
Comfortable working in Agile teams and participating in code reviews and planning.
English proficiency at B2 level or higher (written & spoken).

Nice to Have:

Basic experience with Go and interest in expanding your skills in it.
Knowledge of Kubernetes and microservice orchestration.
Familiarity with Kafka, RabbitMQ or other messaging/streaming systems.
Experience solving high-load challenges and performance bottlenecks.
Hands-on experience with observability tools (Grafana, CloudWatch, etc.).

What We Offer:

Product & Architecture Ownership
Shape a scalable SaaS product — not just write code, but make decisions that impact performance, quality, and business value
Modern Tech Stack
Work hands-on with AWS Lambda, DynamoDB, Kubernetes, Redis, PostgreSQL, and integrate Go where it fits best.
Remote-First Culture
Join a globally distributed team with asynchronous workflows, and optional office access in Barcelona and Tallinn.
High Engineering Standards
We care about clean code, test coverage, performance, and the long-term maintainability of our systems.
Room to Grow
Learn new technologies like Go, improve your infrastructure skills, or mentor junior developers — we’ll support your evolution.

Required profile