Senior Full Stack Engineer (Ruby/ReactJS)

We are looking for a mature Software Engineer with a product mindset to join our team! 🌟

The position will include building great products, tackling interesting challenges, and contributing to our engineering culture. We expect you to work in pairs, use test-driven development, be experienced in building complex web and mobile applications, and write both clean and maintainable code.

What "mature" means to us:

• You've navigated ambiguous problems and designed systems that scaled
• You make pragmatic technical decisions that balance quality with business impact
• You help your team grow through pair work, thoughtful code reviews, and knowledge sharing
• You communicate technical complexity clearly to both engineers and stakeholders

What You'll Work On:

You'll work on both Railsware products and solutions designed for our clients. Here's the scale and complexity you'll tackle:

• Mailtrap.io - An email delivery platform serving 1M+ users globally. Challenges include high-volume email processing, real-time delivery tracking, and API design for diverse integration needs.
• Coupler.io - A data integration and AI analytics platform handling millions of records daily. Think resilient data pipelines, complex transformations, AI integration, and data consistency across systems.
• Titanapps.io – a set of productivity tools for Jira. We architect integrations with third-party APIs, optimize performance for large datasets, and design intuitive UIs for complex workflows.
• NexHealth.com – Patient experience platform transforming healthcare. Tasks include HIPAA-compliant architectures, real-time scheduling systems, and integrations with healthcare providers.
• Tradezella.com – №1 trading journal with sophisticated analytics. Build data visualization systems, complex calculation engines, and real-time market data processing.

• Knowa.co – Executive-level project management solution. Design intuitive interfaces for high-level insights and build aggregation systems for complex organizational data.

  
  Check other examples of the products we built🔗 (http://railsware.com/case-studies/)

   

  Our tech philosophy: We primarily use Ruby and ReactJS, but our codebases are polyglot by design. We actively experiment with Golang, Python and Node.js in production when they're the right tool. You'll have a voice in technical decisions and technology choices.

What we're looking for

🔶 Technical Foundation:

• 5+ years building Ruby applications with deep Rails expertise
• Strong architectural skills—you've designed systems, not just implemented features
• Extensive ReactJS experience, including state management and performance optimization
• Hands-on experience with multiple database systems
• Production experience with cloud platforms (AWS, GCP, Digital Ocean, Heroku)
• Comfortable with UNIX/Linux environments 
• TDD practitioner–you write tests that give confidence, not just coverage

🔶 Professional Maturity:

• Proven ownership. You've led complex features from architecture through production, including stakeholder management
• Technical communication. You can explain trade-offs, advocate for technical investments, and write clear documentation
• Collaborative problem-solver. You build consensus, mentor others, and improve team practices
• Product thinking. You understand user needs and business constraints, not just technical requirements
• Good English for written and verbal communication across distributed teams

🌟 What Sets Exceptional Candidates Apart:

• Experience with pair programming and ensemble programming practices
• Track record of reducing technical debt while maintaining feature velocity
• Open-source contributions or technical writing that demonstrates expertise
• Experience with distributed systems, event-driven architectures, or microservices
• Background in domains like fintech, healthcare, or SaaS platforms at scale

🔷 What You Will Do

• Own end-to-end feature delivery, from technical design and architecture through implementation, testing, and production support
• Drive technical decisions for your domain, including technology choices, architectural patterns, and quality standards
• Elevate code quality through comprehensive testing, thoughtful refactoring, and maintainable design patterns
• Mentor and collaborate: conduct thorough code reviews, pair with team members, and share knowledge actively
• Shape product direction: identify technical opportunities and constraints that influence product decisions
• Proactively improve: spot and address technical debt, performance bottlenecks, and architectural concerns before they become problems
• Communicate clearly: keep stakeholders informed of progress, risks, and technical trade-offs
• Enjoy engineering again 😎

We offer

🔷 Outstanding development culture bit.ly/rw-devculture
🔷 Collaborate with us remotely from any location or in one of our offices (Kyiv/Krakow) bit.ly/rw-remotecollab
🔷 We offer flexible hours
🔷 Get competitive compensation, access to savings program, and microcredits
🔷 Thanks to our hardware policy, we use the best equipment and can regularly update it
🔷 34 days a year as paid time off (24 standard days + 10 more to cover public holidays)
🔷 Health policy budget will cover your private sports and healthcare expenses
🔷 Participate in local and international conferences
🔷 Our offices are equipped with modern ergonomic chairs and standing desks
🔷 You can always find fresh food and drinks in our kitchen
🔷 In Ukraine, we collaborate through Diia.City