Ruby on Rails Developer - Senior

SOFTSWISS; Polska; On-site; PLN 180,000 - 260,000; Full time

Benefits offered by this job

Private health insurance

Sports benefits

Comprehensive Mental Health Program

Free English lessons

Local language courses

Paid time off

Maternity leave support

Referral program rewards

Upskilling, internal workshops, and 参与

Job summary

SOFTSWISS is seeking a Senior Ruby Developer to join our engineering team in Poland. You will design and build scalable Ruby services for high-load, data-intensive systems, owning solutions from implementation to production and optimising performance.

You will collaborate with product and infrastructure teams, research new technologies, and contribute to engineering best practices. The role requires strong Ruby, SQL skills, and a proven track record of delivering complex data-driven solutions.

Qualifications

• 5+ years of software development experience.
• Strong Ruby programming skills.
• Experience building data-intensive applications and tuning performance.
• Experience delivering complex solutions from scratch.
• Strong SQL skills and relational database expertise.
• Good communication skills.

Responsibilities

• Design and build scalable Ruby services for high-load systems.
• Own solutions from implementation to production.
• Monitor and optimize production performance.
• Collaborate with product, infra and business teams.
• Research and develop new technologies and tools.
• Participate in agile development with senior engineers.

Skills

Ruby programming

Data-intensive apps

SQL

Performance tuning

OOP & algorithms

Communication

Tools

ClickHouse

Kafka

Kubernetes

Prometheus

AI tools

Job description

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