Ruby on Rails Developer– Senior

SOFTSWISS

Poznań

On-site

PLN 180,000 - 240,000

Full time

7 days ago

Be an early applicant

Application generator

Turn this role into an interview — a resume and cover letter built around what this employer wants.

Get past ATS filters

Benefits offered by this job

Private health insurance

Sports benefits

Mental Health Program

Free English lessons (online)

Local language courses

Paid time off

Maternity leave support

Referral program rewards

Upskilling and workshops

Job summary

SOFTSWISS is seeking a Senior Ruby on Rails Developer to design and evolve high-throughput Rails services powering our iGaming platform. You will work with AI-assisted tooling to deliver fast yet robust features, owning production behaviour and edge cases.

You will collaborate on architecture, optimize PostgreSQL queries, and mentor mid-level engineers while upholding quality and security in a dynamic, high-load environment.

Qualifications

4+ years of commercial Ruby on Rails experience.
Strong SQL and PostgreSQL skills: indexing, query planning, migrations on large tables without downtime.
Solid grasp of distributed-system fundamentals: message queues, idempotency, eventual consistency, background jobs.
Hands-on experience with AI coding tools and a clear opinion on their use.
Ability to spot a plausible-looking hallucinated API in code reviews.
Experience designing and consuming REST or gRPC APIs; OpenAPI familiarity.
Proficient with Git, CI/CD, Docker; comfortable with Kubernetes manifests and logs.
Experience with observability tools (Prometheus, Grafana, Sentry or OpenTelemetry).
Upper-Intermediate or higher English and Russian.

Responsibilities

Design, build and evolve Rails services powering the iGaming platform: high-throughput APIs, payments, real-time game integrations.
Work in an AI-augmented workflow using coding assistants for scaffolding, refactoring and tests.
Integrate LLM-based features where value is created: fraud signals, automation, analytics copilots.
Own performance and reliability: profile hot paths, tune PostgreSQL queries, implement caching and background jobs.
Review code (human and AI written), mentor engineers and set team standards for AI usage.
Participate in architecture discussions, technical planning and cross-team initiatives.

Skills

Ruby on Rails

PostgreSQL

Redis

Git

CI/CD

Docker

Kubernetes

OpenAPI

AI tools

Tools

Prometheus

Grafana

Sentry

OpenTelemetry

Kafka

RabbitMQ

Job description

Overview:

SOFTSWISS continues to expand its team and is looking for a Senior Ruby on Rails Developer. We need a skilled, proactive and accomplished professional who shares our culture and values and is ready to contribute to the development of cutting-edge gaming solutions.

About Product:

SOFTSWISS Casino Platform Full-service modular software platform to manage online casino operations

Learn More

Purpose of the role:

We're looking for an engineer who treats AI as a force multiplier rather than a shortcut: someone who ships fast with modern tooling, but still owns the architecture, the edge cases and the production behaviour of everything they deliver. If you share our culture and values and want to build high-load gaming solutions used by millions of players, we'd love to talk.

Key responsibilities:

You’ll do design, build and evolve Ruby on Rails services that power our iGaming platform: high-throughput APIs, payment and wallet flows, real-time game integrations and back-office tooling.

Work in an AI-augmented workflow: use coding assistants and agents (Cursor, Claude Code, GitHub Copilot or similar) for scaffolding, refactoring, test generation and code review and take full responsibility for the quality of what gets merged.

Integrate LLM-based features into the product where they create real value: [fraud and risk signals, player-support automation, content generation, internal analytics copilots].

Own performance and reliability: profile hot paths, tune PostgreSQL queries, design caching and background-processing strategies, and drive incidents to root cause.

Review code (human- and AI-written alike), mentor mid-level engineers and help set the team's standards for how we use AI responsibly and effectively.

Take part in architecture discussions, technical planning and cross-team initiatives.

Required Experience:

4+ years of commercial Ruby on Rails experience; deep understanding of Ruby internals, Rails conventions and where to break them.

Strong SQL and PostgreSQL skills: indexing, query planning, migrations on large tables without downtime.

Solid grasp of distributed-system fundamentals: message queues, idempotency, eventual consistency, background jobs (Sidekiq or similar), caching (Redis).

Hands‑on experience with AI coding tools in day‑to‑day work, and a clear opinion on when they help and when they hurt.

You can spot a plausible‑looking hallucinated API in review.

Ability to evaluate and verify AI-generated code: you write and read tests critically, understand what the code actually does, and never merge what you can’t explain.

Experience designing and consuming REST and/or gRPC APIs; familiarity with OpenAPI.

Confident with Git, CI/CD pipelines, Docker; comfortable reading Kubernetes manifests and logs.

Experience with observability tooling (Prometheus/Grafana, Sentry, OpenTelemetry or similar).

Upper-Intermediate or higher English and Russian level

Nice to have:

Experience integrating LLM APIs (OpenAI, Anthropic, open-weight models) into production Ruby applications - prompt design, structured outputs, evaluation, cost and latency control.