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 OwnershipShape 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 CultureJoin a globally distributed team with asynchronous workflows, and optional office access in Barcelona and Tallinn.
- High Engineering StandardsWe care about clean code, test coverage, performance, and the long-term maintainability of our systems.
- Room to GrowLearn new technologies like Go, improve your infrastructure skills, or mentor junior developers — we’ll support your evolution.
