Offer summary

Qualifications:

4+ years of experience in Ruby on Rails backend development., 6+ years of full-stack commercial development experience., Strong understanding of PostgreSQL and relational data modeling., Familiarity with AWS serverless services and key-value stores..

Key responsibilities:

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

Implement new features and collaborate with product and design teams.

Monitor, support, and ensure the security of production code.

Mentor team members and integrate external APIs securely.

Job description

3Commas is a leading platform for crypto trading automation. We’re building a modular SaaS product that empowers traders worldwide to scale strategies, automate workflows, and connect seamlessly with top exchange APIs.

We’re looking for a Full-Stack Engineer (Backend-Focused) with strong Ruby on Rails experience and a passion for building secure, high-performing systems. You'll play a key role in shaping our core architecture, integrating external services, and mentoring fellow engineers — all while ensuring product 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.
Take ownership of your code in production: monitoring, alerting, and ongoing support.
Address high-load and security-related challenges in backend and full-stack solutions.
Mentor and support the growth of other engineers on the team.
Integrate external API services and ensure their secure and stable operation.
Ensure code quality and performance through early involvement in QA and testing workflows (shift-left approach).
Contribute to quality through automated tests, code reviews, and proactive refactoring.
Collaborate closely with cross-functional teams including DevOps and QA.
Stay up to date with best practices in backend architecture, performance, and security.

Requirements:

4+ years of experience in Ruby on Rails backend development.
6+ years of proven full-stack commercial development experience.
Strong understanding of PostgreSQL and relational data modeling.
Familiarity with AWS serverless services (e.g., Lambda, DynamoDB).
Hands-on experience with key-value stores (Redis, Memcached, etc.).
Experience integrating third-party APIs and services.
Adherence to modern software development practices: TDD, CI/CD, clean code, refactoring.
Ability to design and build scalable, secure, and maintainable features.
Strong communication skills and collaborative mindset.
Proficiency in English (B2 level or higher, spoken & written).
Commitment to participating in quality assurance workflows and a strong understanding of the “shift-left” approach.

Nice to Have:

Basic experience with Go and interest in growing your skills in it.
Familiarity with Kubernetes and microservice orchestration.
Knowledge of Kafka, RabbitMQ or similar messaging/streaming systems.
Experience tackling high-load scenarios and optimizing performance bottlenecks.
Hands-on experience with observability tools like Grafana, CloudWatch, etc.

What We Offer:

Product & Architecture Ownership
Work on a product that values quality, performance, and long-term impact. Your decisions shape our platform.

Modern Tech Stack
Ruby on Rails, AWS Lambda, DynamoDB, Redis, PostgreSQL — plus opportunities to use Go where it makes sense.

Remote-First Culture
Collaborate across borders with a globally distributed team. Async-first workflows with office access in Barcelona and Tallinn.

High Engineering Standards
We care about clean code, thoughtful design, reliable infrastructure, and solid test coverage.

Room to Grow
Whether it’s Go, DevOps, mentoring, or scaling architecture — we support your professional growth and learning goals.

Required profile