AI Backend Developer (.NET/C#) - Mid

🏢 Summary: B2B opportunity for an experienced .NET Back-End Developer to build modern, scalable cloud-based solutions using C# and Azure. The role focuses on designing high-performance services, working with CosmosDB, and collaborating in an Agile team with exposure to AI-assisted development tools. This is a fully remote position with competitive hourly rates and long-term cooperation. 🗂️ Requirements: 5+ years of professional experience in .NET development, Strong experience with C#, Proven experience with Azure services, Experience with CosmosDB, Experience with TypeScript or JavaScript, Bachelor’s degree in Computer Science or related field, Ability to align with US-based team working hours, English language proficiency 📃 Skills: .NET, C#, Azure, CosmosDB, TypeScript, JavaScript, AI, Playwright, Selenium, Drupal 🏢 Description: For our client from the technology and industrial solutions sector, we are looking for a .NET Back-End Developer to join a talented development team working on modern, scalable software solutions. Responsibilities: Design, develop, and maintain high-performance back-end services using .NET and C#. Work extensively with Azure cloud services and CosmosDB to build scalable and resilient solutions. Collaborate with front-end developers, product owners, and other team members to integrate back-end services. Participate in code reviews, architectural discussions, sprint planning, and other Agile ceremonies. Use modern development tools and practices to improve productivity, code quality, and maintainability. Explore and apply AI-assisted tools where appropriate to support development, documentation, troubleshooting, and workflow efficiency. Contribute to improving development processes, engineering practices, and team knowledge sharing. Be a proactive problem-solver and continuous learner, staying current with relevant technologies and industry trends. Requirements: Application Development Experience: 5+ years of professional experience in .NET development. Cloud Development Expertise: Proven experience with C#, Azure services, and CosmosDB. Scripting / Front-End Knowledge: Experience with TypeScript preferred, or JavaScript. AI Tool Familiarity: Interest in or hands-on experience using AI tools to support software development, productivity, documentation, research, or troubleshooting. Educational Background: Bachelor’s degree in Computer Science or a related field. Flexibility: Ability to align somewhat with US-based team working hours. Communication: English language proficiency. Stack: Cloud: Azure, CosmosDB Back-End: .NET, C# Scripting / Tooling: TypeScript preferred, JavaScript acceptable Productivity / AI Tools: Familiarity with AI-assisted development or productivity tools is a plus Nice to have: Domain Knowledge: Background in Electrical Engineering or a related technical field. Background or interest in analog and mixed-signal hardware design. Knowledge of hardware or system simulation concepts. CMS Knowledge: Familiarity with Drupal. Test Automation Exposure: Familiarity with tools like Playwright or Selenium. Quality Mindset: Prior QA experience or understanding of QA methodologies is welcome. Offer: Cooperation based on a B2B contract and rate: 140-170 PLN/hour 100% remote work The support of a dedicated mentor. In the relationship, we focus on direct communication. When you join speedapp, you will be put in touch with a dedicated mentor who will make sure that you enjoy working with us and with the client. Events and integration meetings, as well as participation in various initiatives, e.g., sports. Access to the benefits offering (medical care, Multisport card). About Speedapp At speedapp, we believe that an organization is only as good as the people who make it up. We are a team of IT experts and other professionals working for our clients around the world (including Israel, Austria, USA). We go far beyond the HR category. We build IT teams and also help manage them. 👉 10 years of experience 👉 +100 clients worldwide +300 hires per year 💎 We have won the prestigious "Forbes Diamonds" award four times (2022, 2023, 2024, 2025). We are a member of the European Fast Growth Icons network and FinTech Poland. We are ranked 18th among the 100 fastest growing companies 2023 by Clutch.

🏢 Summary: Oferta dla Mid/Senior AI Frontend Developera (React) przy rozwoju platformy telemetrycznej dla operatorów flot. Rola obejmuje tworzenie wydajnych interfejsów do danych w czasie rzeczywistym, map, wideo, konfiguracji oraz zarządzania uprawnieniami, z codziennym wykorzystaniem narzędzi i workflow AI. 🗂️ Requirements: React 19, TypeScript, Vite, Zustand, TanStack Query, TanStack Router, TanStack Table, TanStack Form, Testy automatyczne w Vitest, Visual regression testing, Automatyzacja powtarzalnych zadań z użyciem agentów AI i workflow AI, Codzienna praca z Claude Code 📃 Skills: React, TypeScript, Vite, Zustand, TanStack, Vitest, Claude, Cursor, Copilot, AI, ReactCompiler, MapLibre, HLS, Azure 🏢 Description: Poszukiwany jest AI Frontend Developer (React) na poziomie Mid/Senior, dla którego narzędzia AI, takie jak Claude Code, Cursor i Copilot, są naturalnym elementem codziennej pracy. Rola obejmuje rozwój platformy telemetrycznej w środowisku nastawionym na maksymalne wykorzystanie AI w workflow developerskim. Nad czym pracujemy Platforma zapewnia operatorom flot pełny obraz tego, co dzieje się z ich pojazdami — na żywo oraz z dowolnego momentu w przeszłości. Obejmuje nieprzerwany strumień danych, interfejs mapowy działający płynnie przy dużej liczbie obiektów, odtwarzanie wideo zsynchronizowane z widokiem oraz aplikację dostępną w kilkunastu językach dla organizacji o złożonej strukturze. Drugim obszarem produktu są konfiguracja i zgodność: setki ustawień na poziomie organizacji, pojazdu, urządzenia i użytkownika, rozbudowany system ról i uprawnień oraz ślad audytowy każdej zmiany. Projektowanie formularzy, tabel i przepływów konfiguracyjnych stanowi istotną część pracy inżynierskiej. Produkt jest dojrzały i aktywnie rozwijany — praca odbywa się w istniejącym, niezamrożonym środowisku. Wymagania • React 19 • TypeScript • Vite • Zustand • Ekosystem TanStack: Query, Router, Table, Form • Testy automatyczne z użyciem Vitest • Visual regression testing • Umiejętność automatyzacji powtarzalnych zadań przez agentów AI i workflow AI • Codzienna praca z Claude Code Mile widziane • React Compiler • Feature-Sliced Design (FSD) • Język angielski na poziomie B2 • MapLibre GL • HLS.js • Tworzenie i użytkowanie lokalnych modeli AI • Zmysł estetyczny i dbałość o spójność wizualną interfejsu • Znajomość Azure DevOps

🏢 Summary: Back-End Engineer role focused on building and maintaining cloud-native compliance and monitoring systems for financial environments. The position involves developing scalable, distributed backend services in C#/.NET Core running on AWS and Kubernetes. You will contribute to a modern, evolving tech stack with strong emphasis on solid backend engineering fundamentals. 🗂️ Requirements: Strong experience with C# and .NET Core, Hands-on experience with AWS, Hands-on experience with Kubernetes, Understanding of distributed systems, Experience building backend services, Experience with cloud-native architectures 📃 Skills: C#, .NET, AWS, Kubernetes, Lambda, S3, Kafka, Redis, Airflow, gRPC, Snowflake, SQLServer, OpenTelemetry 🏢 Description: Back-End Engineer (.NET | AWS | Kubernetes) We’re looking for a Back-End Engineer (regular or senior level) to join a team building cloud-native compliance/monitoring systems used in financial environments. You’ll work on backend services in C#/.NET Core , contributing to scalable, distributed platforms running on AWS and Kubernetes . The tech stack is modern and evolving — the more exposure to new technologies, the better, though solid backend fundamentals matter most. We’re looking for: Strong backend experience with C#/.NET Hands-on AWS and Kubernetes (preferred) Understanding of distributed systems Experience with compliance or monitoring systems is a big plus Openness to working with modern, cloud-native technologies Tech environment includes: .NET Core / C#, AWS (Lambda, S3), Kubernetes, Kafka, Redis, Airflow, gRPC, Snowflake, SQL Server, OpenTelemetry. Why join: Work on mission-critical systems supporting compliance and market integrity High engineering standards, ownership, and stability Flexible, pragmatic technical leadership

🏢 Summary: Backend Developer (.NET) role focused on development, maintenance, and modernization of an existing logistics system. The position involves working with legacy code, fixing bugs, refactoring, and improving business logic within a live operational environment. The role requires close collaboration with development and analytics teams. 🗂️ Requirements: 3–5 years of experience with .NET, Proficiency in C#, Experience with ASP.NET MVC or ASP.NET Core, Strong knowledge of SQL Server, Experience working with legacy codebases, Ability to debug and analyze complex issues, Experience with REST API, English level B2 minimum 📃 Skills: .NET, C#, ASP.NET, MVC, Core, SQL, SQLServer, REST, EntityFramework, Docker, UnitTesting 🏢 Description: Organizacja z branży logistycznej, rozwijająca własne systemy operacyjne, poszukuje osoby na stanowisko Backend Developer (.NET). Rola skupiona jest na rozwoju i stabilizacji istniejącego systemu oraz stopniowym jego unowocześnianiu. Zakres obowiązków Rozwój i utrzymanie systemu w technologii .NET Analiza i rozwiązywanie błędów w systemie (bugfixy) Refaktoryzacja istniejącego kodu Analiza logiki biznesowej i jej usprawnianie Współpraca z zespołem developerskim i analitycznym Praca z kodem bez pełnej dokumentacji Wymagania Min. 3–5 lat doświadczenia w .NET Dobra znajomość: C# ASP.NET (MVC / Core) SQL Server Doświadczenie w pracy z istniejącym kodem (legacy) Umiejętność debugowania i analizy problemów Znajomość REST API Znajomość języka angielskiego na poziomie minimum B2 Mile widziane Entity Framework (klasyczny i Core) Podstawy testów jednostkowych Znajomość Docker Oferujemy Pracę przy systemach o realnym wpływie na operacje biznesowe Możliwość rozwoju technologicznego Stabilne zatrudnienie Wpływ na jakość i rozwój systemu

🏢 Summary: Offer for a .NET Backend Developer focused on building backend services in a microservices and cloud-native environment. The role includes developing REST APIs, API-to-API integrations, data access layers, and collaborating in Scrum teams using modern backend technologies. 🗂️ Requirements: Experience as .NET Backend Developer, Practical knowledge of .NET, Knowledge of Scrum, Practical knowledge of Git, Experience with API-to-API communication, Knowledge of asynchronous programming, Experience designing and implementing REST API, Practical knowledge of Entity Framework, Good knowledge of SQL, Experience with PostgreSQL, Experience with microservices architecture, Knowledge of Cloud Native solutions 📃 Skills: .NET, Scrum, Git, REST, EntityFramework, SQL, PostgreSQL, Microservices, CloudNative, Async, API, AWS, Kubernetes, KQL, SIEM, Elastic, Hangfire, gRPC, GraphQL 🏢 Description: O projekcie Poszukujemy .NET Backend Developera do realizacji projektów opartych o architekturę mikroserwisową i rozwiązania cloud-native. Rola obejmuje rozwój usług backendowych, integrację systemów poprzez API oraz współpracę z zespołem projektowym zgodnie z metodyką Scrum. Twój zakres obowiązków projektowanie i rozwój aplikacji backendowych w technologii .NET implementacja oraz rozwój mikroserwisów tworzenie i rozwój REST API integracja systemów z wykorzystaniem komunikacji API-to-API projektowanie i rozwój rozwiązań opartych o architekturę cloud-native współpraca z zespołem projektowym w metodyce Scrum rozwój oraz utrzymanie warstwy dostępu do danych udział w przeglądach kodu oraz stosowanie dobrych praktyk programistycznych Nasze wymagania doświadczenie jako .NET Backend Developer praktyczna znajomość .NET znajomość metodyki Scrum praktyczna znajomość Git doświadczenie w komunikacji API-to-API znajomość programowania asynchronicznego (Async) doświadczenie w projektowaniu i implementacji REST API praktyczna znajomość Entity Framework dobra znajomość SQL doświadczenie z PostgreSQL doświadczenie w pracy z architekturą mikroserwisową znajomość rozwiązań Cloud Native Mile widziane znajomość AWS doświadczenie z Kubernetes znajomość KQL doświadczenie z SIEM znajomość Elastic znajomość Hangfire doświadczenie z gRPC znajomość GraphQL

🏢 Summary: Dev Lead / Senior Backend Engineer role focused on building and leading scalable backend systems using .NET and Microsoft Azure in a complex retail environment. The position combines hands-on development with technical leadership, emphasizing event-driven and microservices architectures. The role drives system design, integration, and engineering quality across a distributed cloud-based landscape. 🗂️ Requirements: Strong backend development experience with C# and .NET, Experience with .NET 8 or modern .NET versions, Experience developing and operating applications on Microsoft Azure, Practical experience designing and building event-driven systems, Experience with microservices architectures, Experience with Azure messaging patterns (queues, topics, event-based integrations), Experience with CI/CD pipelines using Azure DevOps and YAML 📃 Skills: CSharp, DotNet, DotNet8, Azure, Microservices, EventDriven, Messaging, AzureDevOps, YAML, CICD, Queues, Topics 🏢 Description: \We are seeking a Dev Lead / Senior Backend Engineer specialized in .NET and Azure to join a premium fashion retailer's internal tech team. This role is vital for ensuring the scalability, maintainability, and coherence of a broad system landscape. The ideal candidate will possess strong backend development skills, particularly in C# and modern .NET versions, and have practical experience in setting up event-driven architectures and developing applications on Microsoft Azure. The Dev Lead will contribute both as a hands-on developer and as a technical leader, mentoring team members and driving engineering quality. Main Responsibilities The Consultant will work as a hands-on engineer while also supporting the technical direction of the team. Developing backend services and integrations Reviewing pull requests and contributing to code quality Supporting architectural discussions with the Head of Tech and the team Ensuring the overall development landscape remains coherent and scalable Contributing to system design decisions and actively engaging in technical discussions Supporting developers with architectural and technical queries Participating in technical discovery and solution design for new initiatives Driving improvements in development practices Exploring AI-assisted development tools for practical usage Interfacing with third-party SaaS vendors for integration efforts Key Requirements Strong backend development experience with C# / .NET Experience with .NET 8 or modern .NET versions Experience developing and operating applications on Microsoft Azure Practical experience designing and building event-driven systems Experience with microservices architectures Experience with Azure messaging patterns (queues, topics, event-based integrations) Experience with CI/CD pipelines (Azure DevOps, YAML pipelines) Comfortable working remotely in a setup primarily on site Nice to Have Experience with Cosmos DB Experience working with integration platforms Experience building integration-heavy systems Strong understanding of scalable distributed systems Ability to communicate system architecture clearly to stakeholders Experience with e-commerce systems Experience in retail environments

🏢 Summary: Offer for a Backend Developer role focused on designing and building scalable microservices and integrations in a cloud environment using .NET Core and Azure. The position involves real impact on system architecture, code quality, and long-term development of global streaming and media distribution platforms. Work is centered on event-driven systems and close collaboration within autonomous technical teams. 🗂️ Requirements: Minimum 2–3 years commercial experience with .NET and C#, Experience in designing system architecture, Experience with cloud solutions, Experience with microservices or event-driven systems, Ability to participate in code reviews, English level B2 or higher 📃 Skills: C#, .NET, Azure, Microservices, Docker, CosmosDB, MongoDB, SQL, Elasticsearch, Terraform, Git, AzureDevOps, ServiceBus, EventGrid, React, TypeScript 🏢 Description: O nas Jesteśmy software housem specjalizującym się w aplikacjach webowych i rozwiązaniach chmurowych. Od lat współpracujemy z globalnymi markami z branży filmowej i rozrywkowej, tworząc systemy, które codziennie wspierają ich działalność operacyjną i dystrybucyjną. Nasze projekty mają charakter długofalowy — rozwijamy platformy przez wiele lat, pracując blisko zespołów klienta. Cenimy stabilność, jakość i realny wpływ techniczny, a nie rotację krótkotrwałych kontraktów. Wśród naszych realizacji: platforma do sprzedaży licencji filmowych dla międzynarodowych dystrybutorów system katalogowania i dostarczania plików audio, wideo i napisów in-flight entertainment guide dla największych linii lotniczych platforma streamingowa dla branży lotniczej Kogo szukamy Szukamy backend developera, który chce mieć realny wpływ na architekturę, jakość kodu i sposób budowania rozwiązań w naszych projektach. Jeśli lubisz współtworzyć sensowne, skalowalne systemy i pracować w środowisku chmurowym — znajdziesz tu miejsce dla siebie. Czym będziesz się zajmować udziałem w projektowaniu architektury nowych funkcjonalności, usług i integracji współtworzeniem skalowalnych mikroserwisów opartych o .NET Core / C# (większość pracy to nowe funkcjonalności) dbaniem o jakość i spójność techniczną kodu udziałem w code review i dyskusjach architektonicznych współpracą z innymi zespołami przy projektowaniu rozwiązań end-to-end rozwijaniem i utrzymywaniem integracji między systemami (event-driven) Nasz stack .NET Core / C# Microservices, Docker, Event-Driven Architecture Azure: Functions, Service Bus, Cosmos DB, AI Search, Event Grid Databases: MongoDB, MS SQL, Cosmos DB Search: Elasticsearch, Azure AI Search Frontend: React, Micro-Frontends Architecture Infrastructure as Code: Terraform Azure DevOps, Git, GitHub Narzędzia AI: Claude Code, GitHub Copilot Szukamy osoby, która ma min. 2-3 lata doświadczenia komercyjnego w pracy z .NET / C# interesuje się architekturą i projektowaniem systemów ma doświadczenie z rozwiązaniami chmurowymi ma doświadczenie z mikroserwisami lub systemami event-driven potrafi jasno komunikować decyzje techniczne posługuje się angielskim na poziomie min. B2 Mile widziane znajomość Infrastructure as Code (Terraform) znajomość React i TypeScript Jak pracujemy Pracujemy w małych, samodzielnych zespołach (5–7 osób) złożonych z mid i senior developerów, QA oraz lidera technicznego. Każdy zespół ma dużą autonomię i realny wpływ na wybór technologii, architekturę i sposób pracy. Stawiamy na: merytoryczne code review i otwarte dyskusje techniczne wspólne decyzje architektoniczne bezpośrednią komunikację bez warstw korporacyjnego managementu ciągłe usprawnianie procesów i dzielenie się wiedzą Dlaczego warto do nas dołączyć masz realny wpływ na architekturę i kształt projektów pracujesz z doświadczonymi developerami i QA w małych, autonomicznych zespołach budujesz długofalowe rozwiązania o globalnym zasięgu elastyczna praca zdalna lub hybrydowa szybki, w pełni zdalny proces rekrutacyjny partnerska atmosfera i techniczne rozmowy od pierwszego dnia

🏢 Summary: Lead Full-Stack /.NET Developer role focused on modernizing a legacy accounting platform into a cloud-native Azure-based solution using microservices, .NET Core, Angular, and Kubernetes. The position involves backend API development, legacy system decomposition, Azure integrations, CI/CD, and AI-assisted software delivery practices. Candidates will work on scalable cloud architecture while collaborating across engineering and product teams. 🗂️ Requirements: 5+ years experience with .NET Core / ASP.NET Core and C#, Experience designing and implementing REST APIs, Angular frontend development skills, Understanding of microservices architecture, Experience with relational databases, Practical experience with Azure cloud services, Experience with CI/CD pipelines, Knowledge of Docker and Kubernetes / AKS, Ability to work with legacy systems and complex business logic, Strong troubleshooting and collaboration skills, Good English communication skills 📃 Skills: C#, ASP.NET, NETCore, Angular, REST, Azure, AKS, Docker, Kubernetes, SQL, AzureSQL, SQLServer, AzureDevOps, APIManagement, ApplicationGateway, FrontDoor, KeyVault, AzureMonitor, ACR, CI/CD, Microservices, GitHubCopilot 🏢 Description: We are looking for a strong Lead Full-Stack / .NET Developer to support the modernization of a legacy accounting application and its migration to Azure Cloud. The project focuses on transforming an existing desktop/monolithic application into a modern cloud-based solution based on microservices, .NET Core backend APIs, Angular frontend, and Azure platform services. The role requires hands-on engineering experience, strong backend/API development skills, and the ability to work in a modernization context where new cloud-native components need to coexist with legacy systems and shared data models. The team will also use AI-assisted delivery practices and AI agents as part of a new AI SDLC approach to improve development, analysis, testing, and delivery efficiency. Responsibilities Design, develop and maintain backend services and APIs using .NET Core / ASP.NET Core Support decomposition of legacy monolithic functionality into modular services and APIs Development and enhancement of Angular-based frontend components where needed Integration of application components with Azure services and existing backend systems Work with Azure Kubernetes Service, API Management, Application Gateway, Azure SQL and related platform services Contribute to technical analysis of legacy application behavior, data flows and integration points Implementation of clean, maintainable and testable code following engineering best practices Participation in code reviews, automated testing, CI/CD pipelines and release activities Collaboration with architects, product owners, QA engineers and other developers to clarify requirements and technical constraints Use of AI-assisted development tools and agents as part of the project delivery process Requirements 5+ years of experience with .NET Core / ASP.NET Core and C# Solid experience in designing and implementing REST APIs Skills in Angular and modern frontend development Understanding of microservices architecture and application modernization patterns Experience working with relational databases, preferably Azure SQL / SQL Server Practical experience with Azure cloud services Proficiency in CI/CD pipelines, preferably Azure DevOps Understanding of containerized application delivery, preferably Docker and Kubernetes / AKS Capability to work with legacy systems, existing data models and complex business logic Strong troubleshooting, communication and collaboration skills Good English communication skills Nice to have Background in accounting, finance, ERP or invoicing systems Experience migrating desktop or monolithic applications to cloud-native architectures Familiarity with Azure API Management, Application Gateway, Front Door, Key Vault, Azure Monitor and Azure Container Registry Expertise in domain-driven design, service decomposition and API-first development Skills in automated testing and quality engineering practices Flexibility to use AI-assisted development tools such as GitHub Copilot, Claude Code or similar coding agents Interest in AI SDLC, agent-assisted delivery and modern software engineering automation We offer We gather like-minded people: Engineering community of industry professionals Friendly team and enjoyable working environment Flexible schedule and opportunity to work remotely within Poland Chance to work abroad for up to 60 days annually Business-driven relocation opportunities We provide growth opportunities: Outstanding career roadmap Leadership development, career advising, soft skills, and well-being programs Certification (GCP, Azure, AWS) Unlimited access to LinkedIn Learning, Get Abstract, Cloud Guru English classes We cover it all: Stable income (Employment Contract or B2B) Participation in the Employee Stock Purchase Plan Benefits package (health insurance, multisport, shopping vouchers) Strategically located offices featuring entertainment and relaxation zones, table tennis and football, free snacks, fantastic coffee, and more Referral bonuses Corporate, social and well-being events Please, note: The set of bonuses might vary based on the role you apply for – specifics will be discussed with our recruiter during the general interview. We will reach out to selected candidates exclusively. EPAM is a leading global provider of digital platform engineering and development services. We are committed to having a positive impact on our customers, our employees, and our communities. We embrace a dynamic and inclusive culture. Here you will collaborate with multi-national teams, contribute to a myriad of innovative projects that deliver the most creative and cutting-edge solutions, and have an opportunity to continuously learn and grow. No matter where you are located, you will join a dedicated, creative, and diverse community that will help you discover your fullest potential.

🏢 Summary: Role focused on leading AI automation discovery and designing technical specifications for .NET-based solutions by analyzing client systems and integrations. Combines client-facing process analysis with deep technical evaluation of APIs, integrations, and LLM-based workflows. Involves creating detailed integration and architecture specs for the .NET team without daily coding responsibilities. 🗂️ Requirements: Minimum 2 years of commercial programming experience (.NET, Java, Python, PHP, or JavaScript), Ability to independently analyze REST APIs using Swagger and Postman/Insomnia, Understanding of authentication mechanisms: OAuth2, API key, JWT, Understanding of synchronous and asynchronous integrations, Knowledge of message queues and their impact on integration architecture, Ability to create detailed technical specifications (data models, API contracts, integration flows, error handling), Practical daily use of AI coding tools (Claude Code, Cursor, Copilot), Experience in requirements gathering and direct work with technical clients, English level B2 or higher 📃 Skills: .NET, C#, ASP.NET, REST, Swagger, Postman, OAuth2, JWT, RabbitMQ, Azure, SQS, CQRS, MediatR, EF, PostgreSQL, Claude, OpenAI, Docker, Git 🏢 Description: Budujemy automatyzacje AI dla klientów w .NET. Potrzebujemy kogoś, kto łączy dwa światy: rozmawia z klientem o jego procesach biznesowych, a potem otwiera Claude Code, analizuje jego system i pisze spec dla naszego zespołu .NET. Idealny kandydat to .NET developer lub solutions architect, który chce pracować na styku techniki i biznesu — bez codziennego kodowania, ale z pełnym rozumieniem tego, co budujemy. Wymagania : ✓ Min. 2 lata komercyjnego doświadczenia w programowaniu (dowolny stack: .NET, Java, Python, PHP, JavaScript) — weryfikujemy to na rozmowie ✓Samodzielna analiza REST API — czytasz Swaggera, odpytujesz endpointy Postmanem/Insomnia, rozumiesz auth: OAuth2, API key, JWT ✓Rozumiesz integracje systemów — wiesz czym różni się synchroniczna REST od asynchronicznej przez kolejkę i kiedy użyć której ✓Rozumiesz po co są kolejki wiadomości (RabbitMQ, Azure Service Bus, SQS) — nie musisz ich konfigurować, ale wiesz jak wpływają na projekt integracji ✓Tworzysz specyfikacje techniczne — nie tylko user stories, ale konkretne wymagania: modele danych, kontrakty API, flow integracji, obsługa błędów ✓Aktywnie używasz AI do pracy — Claude Code, Cursor, Copilot (nie jako ciekawostkę, ale jako codzienne narzędzie) ✓Doświadczenie w zbieraniu wymagań i bezpośredniej pracy z klientem technicznym ✓Angielski B2+ — dokumentacja i komunikacja z klientem zagranicznym Czego nie szukamy ✗Klasyczny BA / PM bez backgroundu developerskiego ✗Scrum Master lub Project Manager szukający nowej roli ✗Ktoś, kto "czytał dokumentację API" ale nigdy nie debugował integracji ✗Ktoś, dla kogo "zintegruj dwa systemy" znaczy "napiszę user story" Mile widziane ·Doświadczenie z .NET / C# — nawet komercyjne sprzed lat ·Praca z LLM-ami i automatyzacją AI w projektach produkcyjnych ·Znajomość DDD, Event Storming, Clean Architecture ·Doświadczenie w software house lub consulting ·Certyfikaty: Azure Developer, AWS, IIBA Co będziesz robić ·Prowadzić discovery z klientami — identyfikować procesy do automatyzacji AI i mapować istniejące integracje między ich systemami ·Analizować systemy klientów (API, bazy, integracje) przy pomocy Claude Code — sam weryfikujesz feasibility, nie czekasz na deva ·Projektować workflow automatyzacji AI — gdzie wchodzi LLM, gdzie klasyczna logika, jak przepływają dane między systemami ·Pisać specyfikacje techniczne dla .NET teamu — endpointy, modele danych, kontrakty integracyjne, obsługa błędów i edge case'ów ·Współpracować z .NET devami jako partner techniczny, nie ticket dispatcher Nasz stack (musisz rozumieć, nie kodować) Backend .NET 9, ASP.NET Core Clean Architecture, DDD CQRS z MediatR EF Core, PostgreSQL AI & automatyzacja Claude, OpenAI Microsoft Agent Framework Integracje LLM w aplikacjach Automatyzacja procesów Integracje REST API, Webhooks, OAuth2, JWT ERP/zewnętrzne API Narzędzia Claude Code, Cursor Jira, Confluence Miro (Event Storming) Docker, Git

🏢 Summary: Backend .NET Developer role focused on building and enhancing a production-ready, cloud-based platform with strong emphasis on AI-driven solutions. The position involves designing scalable backend services within a cross-functional team and contributing to technical and product decisions. Developers work with modern technologies to deliver high-impact features in a stable architecture. 🗂️ Requirements: 3+ years experience in backend web application development, .NET 8 and C# proficiency, Experience with Docker, Experience with PostgreSQL, DynamoDB or Elasticsearch, Experience with Entity Framework, Familiarity with AI and Large Language Models (LLMs), Ability to read and understand Python code, Experience designing scalable cloud-based solutions, English proficiency for technical communication 📃 Skills: C#, .NET, PostgreSQL, DynamoDB, Elasticsearch, EntityFramework, Docker, AWS, Python, AI, LLM 🏢 Description: At Big Blue Marble, we work on our own production-ready platform, already used by clients around the world. The product is stable and well-designed, which allows our developers to focus on building new, high-impact features rather than dealing with legacy code or unstable architecture. It’s a rewarding environment where your work directly contributes to real outcomes and you have room to explore and improve existing solutions. As a Backend .NET Developer , you will join a cross-functional team building cloud-based solutions, with a strong focus on AI-driven products. You will take part in both technical and product discussions, helping design robust and scalable solutions. We value ownership, transparency, and collaboration, and we provide the tools and support you need to do your best work. Our tech stack: C# with the .NET 8, Databases: PostgreSQL, DynamoDB and Elasticsearch, ORM: entity framework, Docker, AWS. What we expect: At least 3+ years of experience in developing web applications (as a backend developer), Familiarity with AI, especially Large Language Models (LLMs), Experience working with Docker, Ability to read and understand Python code, very good knowledge of C# and .NET 8, Analytical thinking skills and being able to translate organizational/business requirements into service functionalities, being able to solve problems and make decisions independently, communicative English, good teamwork and learning skills. Even better if you also have: knowledge of the AWS cloud. familiarity with video processing and distribution. What you’ll get in return: compensation in the range of 12 500 - 17 000 PLN net B2B, fully remote work with flexible working hours, one full day per sprint for learning and development, access to the MyBenefit platform, including the option to join the MultiSport program and use other services, a choice to join our group health insurance, access the wellbeing platform Mindgram that helps you stay in a good mental shape, access to the language learning platform Tutlo, company-wide quarterly meetings (when we head out together, sum up the quarter, have fun, and enjoy spending time as a team), optional (bun fun!) team activities, like joint mountain trekking trips, St. Nicolas Day event for kids, board game nights, and more, a welcoming office in the very heart of Poznań, if you prefer to work on-site. If you’d like to join our team, leave your CV below. We’d be happy to get in touch with you! Recruitment process: Interview with People Operations Specialist - a 30-minute online meeting to get to know each other better, Interview with the Chapter leader and the People Operations Specialist - a more in-depth conversation about the role and mutual expectations, lasting about 1 hour. You can count on our feedback after each stage to ensure the process is as transparent and valuable as possible.