Tomasz Cieńciała

Backend Engineer focused on scalable systems

Senior Ruby on Rails Engineer

~10 years of commercial experience building and scaling backend systems, APIs and integrations in production environments.

Focused on building real-world systems, not demos

BACKEND SYSTEMS API DESIGN INTEGRATIONS PERFORMANCE SCALABILITY
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Personal and commercial projects focused on real-world usage and scalability

Previously: Polcode, Codete, spaceOS

Based in Poland • Open to remote opportunities

English (fluent) · Polish (native) · Czech (working proficiency)

Tomasz Cieńciała

Experience

Senior Ruby on Rails Engineer / Independent Contractor

2022 — Present
  • Delivering production-ready backend systems used in real-world applications
  • Designing and building backend systems and APIs
  • Working on integrations and performance-critical features
  • Developing cross-platform solutions (Rails + Flutter)

spaceOS

2021 — 2022
  • Built integrations with Google and Microsoft Graph API
  • Improved performance using caching and analytics
  • Worked on production SaaS platform used by enterprise clients

Codete

2020 — 2021
  • Developed LMS platform (Rails, Docker, MongoDB)
  • Improved legacy workflows and backend performance
  • Worked in containerized environment

Spaceti

2020
  • Worked on microservices architecture
  • Implemented secure multitenancy
  • Built internal APIs

Polcode

2018 — 2020
  • Developed and refactored multiple Rails applications
  • Worked on APIs, legacy upgrades and bug fixing
  • Collaborated with international clients

Selected Products

Independently built and maintained products designed for real-world usage, scalability and long-term growth

Calculyo preview

Calculyo

YAML-driven calculation engine (shared backend + Flutter logic). Designed for SEO scaling (100+ tools, multi-language, long-tail traffic). Offline-first architecture.

Used to power 100+ SEO-driven tools

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Drillyo preview

Drillyo

YAML-based system for generating educational content. Offline-first mobile app with local persistence. Synchronization-ready architecture.

Designed for scalable content generation workflows

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Parcelina

Aggregates parcel tracking across multiple carriers. Unified API and simplified tracking interface. Designed for practical, real-world usage.

Built for real-world parcel tracking use cases

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SpamEye preview

SpamEye

Real-time phone number intelligence API. Designed for low-latency lookups in live call flows. Scalable backend architecture.

Optimized for real-time decision systems

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Tidudanka

SEO-driven platform for discovering family attractions. Multi-language content with location-based discovery. Built for long-tail traffic and scalability.

Focused on SEO and organic traffic acquisition

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Tidudanka QR preview

Tidudanka QR

QR-based content delivery system for museums. Multi-language mobile interface. Lightweight alternative to audio guides.

Used in physical museum environments

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Core Strengths

  • Designing scalable backend systems
  • API design and external integrations
  • Performance optimization and bottleneck analysis
  • Building SEO-driven backend architectures

Technical Stack

terminal

Backend

  • Ruby on Rails (API-first, production systems)
  • PostgreSQL (performance, indexing)
  • Redis / Sidekiq (async jobs, queues)
smartphone

Frontend & Mobile

  • Flutter
  • JavaScript / Vue
  • Tailwind CSS
dns

Infrastructure

  • Docker (production environments)
  • AWS
  • CI/CD (deployment pipelines)