Senior Backend Developer

Basic Qualifications

• Degree in Computer Science, Software Engineering, or related field.
  
• Deep understanding of common architectural concepts, patterns, and approaches.
  
• Excellent Java (Core, OOP, JPA, Spring) development skills.
  
• Proficiency in Kotlin for backend development.
  
• Solid knowledge of Spring Boot and Spring Cloud.
  
• Experience with microservices architecture and service orchestration.
  
• Strong understanding of REST APIs, WebSockets, and asynchronous messaging.
  
• Experience with unit testing and code quality tools.
  
• Experience with Google Cloud Platform.
  
• Knowledge of RDBMS (PostgreSQL) and NoSQL engines (MongoDB).
  
• Experience with Docker and containerized deployments.
  
• Good knowledge of Git and collaborative development workflows (GitFlow).
  
• Strong algorithmic and problem-solving skills.
  
• Experience with continuous integration, continuous delivery, test-driven development.
• English at B1+ level or higher.

Additional Requirements

• Experience with Kafka, RabbitMQ, or MQTT for event-driven systems.
  
• Familiarity with OAuth2, Keycloak, and Spring Security for authentication & authorization.
  
• SSO (Single Sign-On) implementation and management experience using SAML, OpenID Connect, or similar protocols.
  
• Understanding of scalable cloud architectures (preferably Google Cloud or AWS).
  
• Google Cloud Platform infrastructure expertise including Compute Engine, Cloud Run, Cloud Functions, Cloud Storage, and networking services.
  
• Experience with NoSQL databases (e.g., MongoDB, Redis).
  
• Knowledge of GraphQL API development.
  
• Experience with frontend technologies - preferably React.js or Angular for supporting frontend development and integration.
  
• DevOps expertise in setting up and configuring CI/CD pipelines using tools such as Jenkins, GitHub Actions, GitLab CI, or similar.
  
• Knowledge of Agile/Scrum workflows.
  

Nice to Have

• Background in IoT systems or embedded systems integration.
  
• Experience with data streaming and real-time analytics.
  
• Exposure to machine learning model integration in backend services.
  
• Domain knowledge in agriculture technology or automotive systems.
  
• Experience with geographic data processing and spatial analysis tools.
  
• Knowledge of ELK stack (Elasticsearch, Logstash, Kibana) for data analysis and visualization.

About the Role

We are looking for a Senior Backend Developer with strong expertise in Java EE, Kotlin, and Spring Boot to join our R&D team in Gliwice.

You will be working on cloud services, APIs, and backend systems powering our precision agriculture solutions, including real-time tractor guidance, farm data management, and integration with IoT/embedded systems. You will design scalable architectures, implement high-performance data processing pipelines, and ensure our backend services meet the highest standards of reliability and security.

If you thrive in a self-managed, innovation-driven environment and want to make an impact on sustainable agriculture, this is the role for you. 

What We Offer

• Opportunity to work on innovative agricultural automation and IoT systems.
  
• A strong social and ecological mission: helping farmers and the environment.
  
• Competitive salary and clear growth path.
  
• Flexible working hours with hybrid/on-site work options.
  
• Office and testing facilities in Gliwice, Poland.
  
• Paid vacation and holidays in line with legislation.

Note: This position requires occasional on-site presence in Gliwice for integration with hardware and IoT systems.

Company Overview

FieldBee Polska sp. z o.o. is a 100% subsidiary of eFarmer B.V. – a rapidly scaling Dutch agri-tech company (fieldbee.com) developing advanced tractor guidance systems, farm management software, and precision agriculture solutions.
We help farmers transition to more efficient, precise, and sustainable agriculture, serving the majority of the world's farmers who remain underserved by modern technology.

,[Design, develop, and maintain Java EE / Kotlin / Spring Boot backend services., Build and maintain RESTful APIs and gRPC services for web, mobile, and embedded clients., Integrate with IoT devices and cloud data processing pipelines., Develop and integrate new RESTful services for syncing from Android clients and web application endpoints., Integrate with 3rd-party services (weather, satellite services, etc.)., Support current backend applications (RESTful API, JSF, OAuth 2.0, WebSockets)., Develop new microservices for manipulating geographic data, transformation, and analyzing field work activities using MongoDB and ELK stack., Work with GeoTools, Security (OAuth 2.0), JPA, PostgreSQL (PostGIS, HStore)., Optimize services for scalability, performance, and fault tolerance., Implement unit, integration, and performance tests., Set up and maintain CI/CD pipelines and participate in DevOps processes., Create and maintain technical documentation and architecture diagrams., Perform code reviews and mentor junior developers., Collaborate closely with frontend, mobile, and embedded teams., Support frontend development with React.js or Angular integration expertise.] Requirements: Java, Kotlin, Spring Boot, Spring Cloud, Git, REST API, Microservices architecture, JPA, RDBMS, GitHub Actions, Google Cloud Platform, PostgreSQL, Docker, Kafka, RabbitMQ, AWS, MQTT, MongoDB, Redis, GraphQL, Test-driven development, React, Angular, GitLab, API, DevOps, CD pipelines, Machine learning Additionally: International projects, Small teams, Free coffee, Canteen, Free snacks, Free parking, Modern office, Startup atmosphere, No dress code.

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