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3Commas.io

Senior Full-Stack Engineer (BE)

3Commas.io
Estonia · Full-time · Mid-Senior
3Commas.io is a leading developer of cryptocurrency trading software, building the leading automation platform for crypto trading—turning complex markets into simple yet powerful algorithmic strategies. Our AI-driven bots (DCA, Grid, Signal), deep integrations with TradingView, and a robust API enable traders to automate and optimize across 15+ major exchanges, including Binance, Coinbase, OKX, and Bybit. We serve a global community of individual and institutional traders and developers who rely on our security-first, reliable, and battle-tested infrastructure to run strategies 24/7. Join us to build tools that power real trading volume, tackle hard product and engineering problems at scale, and make pro-level trading accessible to everyone.

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.

Why Join 3Commas.io?

Impact at Scale

Drive product innovation for a platform used by millions of traders and developers worldwide.

Strategic Influence

Shape the product roadmap and user experience alongside executive leadership.

Culture of Growth

Join a passionate, talented team where ideas are valued, and careers are accelerated.

Global & Remote

Work flexibly from Barcelona, Tallinn, Cyprus — or remotely, in sync with our distributed product and tech teams.

Equal Opportunity Statement

3Commas.io is proud to be an equal opportunity employer. We believe diversity fuels innovation and welcomes applications from individuals of all backgrounds, identities, and experiences — regardless of race, gender, age, religion, disability, or sexual orientation.

Key Skills

Ranked by relevance

ruby cryptocurrency ruby on rails kubernetes postgresql serverless rabbitmq grafana devops redis kafka saas cicd tdd aws ai
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Country Guide

Estonia

Digital-first ecosystem and startup culture

Posted
Aug 28, 2025
Type
Full-time
Level
Mid-Senior
Location
Tallinn
Company
3Commas.io

Industries

Software Development

Categories

Engineering Information Technology

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