Sigma Software
Principal Software Engineer (Ruby Expert)
Skills
2 months ago
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Important information
Contract type:
Permanent
Location:
Warsaw, Poland
Work mode:
Onsite
Published on:
26 August 2026
What they need
We are looking for an experienced Principal Software Engineer with deep expertise in Ruby to lead the technical direction of our platform and drive the development of complex, scalable, and high-performance systems.
In this role, you will define architectural strategy, make key engineering decisions, mentor the team, and ensure the highest standards of code quality and engineering excellence.
The ideal candidate combines strong hands-on skills with strategic thinking, product awareness, and a passion for building robust, efficient, and future-proof solutions.
Architect and implement scalable, high-performance software solutions using Ruby and Ruby on Rails
Lead the design and development of new features and products, ensuring code quality and best practices
Collaborate with cross-functional teams to define and implement technical strategies
Mentor and guide junior developers, fostering a culture of continuous learning and improvement
Conduct code reviews and provide constructive feedback to team members
Optimize existing systems for improved performance and scalability
Contribute to the evolution of our technology stack and development processes
Participate in technical decision-making and help set the direction for our engineering efforts
Stay up-to-date with emerging technologies and industry trends, recommending innovations when appropriate
Troubleshoot and resolve complex technical issues in production environments
Expert-level proficiency in Ruby and strong knowledge of Ruby on Rails framework
8-10+ years of software development experience, with a proven track record of leading complex projects
Bachelor's degree in Computer Science, Software Engineering, or related field (or equivalent experience)
Strong experience with web development technologies (HTML, CSS, JavaScript)
Proficiency in database systems (e.g., PostgreSQL, MySQL) and version control systems (e.g., Git)
Deep understanding of software design patterns, principles, and best practices
Experience with test-driven development (TDD) and automated testing frameworks
Knowledge of scalable and distributed systems architecture
Familiarity with cloud computing platforms (e.g., AWS, Azure, GCP)
Strong problem-solving skills and ability to architect complex software solutions
Excellent communication and leadership abilities, with experience mentoring junior developers
Experience working with Agile methodologies
Ability to balance technical leadership with hands-on coding
Passion for staying current with emerging technologies and industry trends
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