06/16/2026 updated
100 % available
Celadon - Mobile and Web App development
Warsaw, Poland
Germany +2
info: Germany, Austria, Switzerland
Clean Code PrinciplesSoftware PrototypingWebDevApache CordovaCypress (Programming Language)BackendCloudformationKotlin
Our technical expertise spans custom business systems, mobile products, and AI‑enabled workflows — delivered by senior engineers with structured PM/QA and domain awareness.
Backend & Systems: Node.js, Python (Django, FastAPI), Java, PHP (Laravel, Symfony), .NET Core. Microservices, RESTful APIs, GraphQL, WebSockets, event‑driven architecture. PostgreSQL, MySQL, MongoDB, Redis, Elasticsearch.
Mobile: iOS (Swift, UIKit, SwiftUI), Android (Kotlin, Jetpack Compose), cross‑platform (Flutter, React Native). Clean Architecture, MVVM, MVI, offline mode, real‑time sync, geolocation, payments, biometrics.
AI & ML: OpenAI API, Claude API, RAG, fine‑tuning, LangChain, LlamaIndex, vector databases. scikit‑learn, TensorFlow, PyTorch. NLP, computer vision, document processing, chatbots, predictive analytics.
Cloud & Infrastructure: AWS, Azure, GCP. Docker, Kubernetes, CI/CD (GitHub Actions, GitLab CI, Jenkins). Infrastructure as Code (Terraform, CloudFormation).
Delivery & QA: Product Discovery, Solution Design, Business Analysis. Agile (Scrum, Kanban). Manual and automated testing (Selenium, Playwright, Cypress, JUnit, PyTest, Jest). Performance testing (JMeter, k6). API testing (Postman).
Industry domains: Food & Beverage (inventory, delivery, loyalty), Real Estate (property management, CRM, maintenance), FinTech (payments, compliance, analytics). Growing expertise in iGaming, EdTech, Travel Tech.
Engineering culture: Senior‑led development. AI‑accelerated (not AI‑driven) — AI supports docs, tests, prototyping, while architecture and quality remain under senior control. Clean code, SOLID, design patterns, code reviews, security (OWASP, GDPR, ISO 9001). Scalable, vendor‑independent systems with full documentation and handover.
Experience
Professional experience5 - 10 years
Freelancer since2016
Languages
ArabicNative speakerEnglishNative speakerRussianNative speaker