Principal Software Engineer (Ruby Expert)

Warsaw, PolandOn-SiteFull-time8–10 yrs experiencePosted 3w ago

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Job description

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

WILL BE A PLUS

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About the company

Sigma Software

We are looking for a Senior Go Developer to join our dynamic team and work on cutting-edge AdTech solutions. This role offers the opportunity to experiment with AI, LLMs, and emerging technologies while solving complex challenges in large-scale data processing.  CUSTOMER Our customer is a global leader in contextual advertising with more than 500 employees worldwide. They specialize in delivering highly relevant ads by leveraging AI, real-time technology, and large-scale data processing. Operating in the AdTech industry, they are recognized for innovation in Connected TV (CTV) advertising. The team you will join works with the agility of a startup while benefiting from the resources of a global organization. PROJECT You will contribute to the development of a smart advertising platform that processes terabytes of data to understand audiences and deliver precise, contextual ads. The platform combines AI, LLMs, and emerging technologies to push the boundaries of CTV advertising. In this role, you will own innovation end-to-end — from research and prototyping to delivering production-ready solutions.

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Industry: AdTech
Open roles: 49