SOFTSWISS

Ruby on Rails Developer - Senior

Warsaw, Mazovia, Poland (city only)
Belgrade, Central Serbia, Serbia (city only)
Káto Polemídia, Limassol, Cyprus (city only)
Poznań, Greater Poland, Poland (city only)

On-site

First seen by offpeak October 22, 2026

See your drive time Apply on SOFTSWISS's site

Overview:

We are looking for a Senior Ruby Developer to join a highly experienced engineering team working on complex, data-intensive systems. You will help design and build reliable, fault-tolerant solutions, take ownership of their performance in production, and solve challenging data and scalability problems.

Purpose of the role:

Design and improve scalable Ruby services for high-load, data-intensive systems. You will own solutions from implementation to production, troubleshoot complex issues, optimize application and database performance, and contribute to technical decisions and engineering practices.

Key responsibilities:

Work in a fully agile environment with senior engineers and product managers
Participate in designing fault-tolerant, highly available and optimized solutions
Monitor and optimize your services in production for excellence
Research and develop new technologies and tools
Collaborate with other teams - product, infrastructure and business

Required Experience:

Minimum 5-year experience in software development
Solid Ruby programming skills
Hands-on experience with data-intensive applications development & performance tuning
Experience in developing complex solutions from scratch
Strong SQL skills and solid understanding of relational databases, with the ability and curiosity to investigate complex data issues, analyze large datasets, and perform root-cause analysis
Deep data structures, OOP, and algorithms knowledge
Good communication skills

Nice to have:

Familiarity with ClickHouse
Familiarity with AI-powered developer tools and practical experience integrating them into daily development workflows
Experience with Kafka
Ability to implement space and time-efficient algorithms and understand which one is preferable and when
Readiness to learn other programming languages (e.g. Golang, Scala)
Familiarity with SRE practices
Familiarity with cloud native technologies (e.g. k8s, Helm, Prometheus)

Our Benefits:

Private health insurance
Sports benefits
Comprehensive Mental Health Program
Free English lessons (online)
Local language courses
Paid time off
Maternity leave support
Referral program rewards
Upskilling, internal workshops, and participation in professional conferences and corporate events