Senior Fullstack Developer (.NET, React, Claude)
⚲ Kraków
21 840 - 26 880 PLN netto (B2B)
Wymagania
- Claude
- .Net
- React
Opis stanowiska
We’re hiring a hands-on Software Engineers to help us build two brand-new products. This is a total greenfield setup: new architecture, new codebases, new delivery approach, built as separate systems in .NET + React, with a strong focus on AI-first engineering. Day to day, you’ll use tools like Claude Code and work with a framework that leverages AI agents to speed up delivery, improve quality, and automate repetitive development work.
You’ll join early, which means real influence: shaping architecture and technical direction, helping define quality standards, testing approach, deployments, and how the team works. The setup is closer to a startup-style product team than a rigid corporate project, while still having dedicated Engineering Manager, Product Manager, and Tech Lead to support delivery.
What you’ll do:
• Build backend services and RESTful APIs using C#/.NET (.NET Core / .NET)
• Develop and evolve web frontends in React (experience layer / UI consuming APIs)
• Contribute to solution design in a service-oriented / microservices architecture
• Use Claude Code in daily work: prompt-driven coding, refactoring, test generation, and building/iterating on coding agents
• Help establish and improve engineering practices: testing strategy, code standards, CI/CD, quality automation
• Implement and enhance observability (logging, metrics, tracing) and API monitoring
• Work with cloud-native services (Azure/AWS/GCP) and containerised deployments (e.g., Kubernetes)
• Collaborate in an Agile setup: refinement, estimation, code reviews, continuous improvement
What we’re looking for:
• minimum 5 years of professional software development experience
• Strong commercial experience with C#/.NET and building REST APIs
• Proven delivery of web applications / SaaS products
• Solid engineering fundamentals (data structures, algorithms, design patterns)
• Experience with cloud architectures (Azure, AWS or GCP) and cloud-native services
• Understanding of distributed systems concepts (scalability, reliability, concurrency)
• Strong problem-solving skills, clear communication, and a collaborative mindset
• Genuine interest in combining classic software engineering with practical AI tooling (Claude / agents)
Nice to have:
• Experience with API gateways, identity/authentication, messaging (Kafka/SQS/RabbitMQ)
• Workflow orchestration / job scheduling / search-related experience
• Container orchestration knowledge (Kubernetes/Nomad/Mesos)
• Strong front-end fundamentals beyond React (HTML/CSS/JS best practices)
• Experience leading technical initiatives or acting as a go-to engineer on key topics
You’ll join early, which means real influence: shaping architecture and technical direction, helping define quality standards, testing approach, deployments, and how the team works. The setup is closer to a startup-style product team than a rigid corporate project, while still having dedicated Engineering Manager, Product Manager, and Tech Lead to support delivery.
What you’ll do:
• Build backend services and RESTful APIs using C#/.NET (.NET Core / .NET)
• Develop and evolve web frontends in React (experience layer / UI consuming APIs)
• Contribute to solution design in a service-oriented / microservices architecture
• Use Claude Code in daily work: prompt-driven coding, refactoring, test generation, and building/iterating on coding agents
• Help establish and improve engineering practices: testing strategy, code standards, CI/CD, quality automation
• Implement and enhance observability (logging, metrics, tracing) and API monitoring
• Work with cloud-native services (Azure/AWS/GCP) and containerised deployments (e.g., Kubernetes)
• Collaborate in an Agile setup: refinement, estimation, code reviews, continuous improvement
What we’re looking for:
• minimum 5 years of professional software development experience
• Strong commercial experience with C#/.NET and building REST APIs
• Proven delivery of web applications / SaaS products
• Solid engineering fundamentals (data structures, algorithms, design patterns)
• Experience with cloud architectures (Azure, AWS or GCP) and cloud-native services
• Understanding of distributed systems concepts (scalability, reliability, concurrency)
• Strong problem-solving skills, clear communication, and a collaborative mindset
• Genuine interest in combining classic software engineering with practical AI tooling (Claude / agents)
Nice to have:
• Experience with API gateways, identity/authentication, messaging (Kafka/SQS/RabbitMQ)
• Workflow orchestration / job scheduling / search-related experience
• Container orchestration knowledge (Kubernetes/Nomad/Mesos)
• Strong front-end fundamentals beyond React (HTML/CSS/JS best practices)
• Experience leading technical initiatives or acting as a go-to engineer on key topics
🔍 Dekoder Ogłoszenia
🔴
This is a total greenfield setup: new architecture, new codebases, new delivery approach
Oznacza to, że projekt jest od podstaw i wymaga od kandydata dużej samodzielności w definiowaniu procesów i technologii, a nie tylko implementacji istniejących rozwiązań.
🔴
You’ll join early, which means real influence: shaping architecture and technical direction, helping define quality standards, testing approach, deployments, and how the team works.
Choć brzmi to jak duża swoboda i wpływ, może też oznaczać brak ugruntowanych procesów i konieczność tworzenia wszystkiego od zera, co może być czasochłonne.
🔴
The setup is closer to a startup-style product team than a rigid corporate project
Sugestia elastyczności i mniejszej biurokracji, ale może też oznaczać brak jasno zdefiniowanych ścieżek kariery i potencjalnie większą presję na szybkie dostarczanie wyników.
🟡
work with a framework that leverages AI agents to speed up delivery, improve quality, and automate repetitive development work.
Kandydat będzie musiał nauczyć się i efektywnie wykorzystywać narzędzia oparte na AI, co może wymagać dodatkowego czasu na naukę i adaptację, a niekoniecznie oznacza całkowite wyeliminowanie pracy.
🔴
Help establish and improve engineering practices: testing strategy, code standards, CI/CD, quality automation
Oprócz kodowania, od kandydata oczekuje się aktywnego udziału w definiowaniu i wdrażaniu procesów inżynieryjnych, co wykracza poza typowe obowiązki programisty.