Senior Backend Developer

Experience: 8+ years

Job Description:
We are looking for a Senior Backend Developer responsible for managing the interchange of data between the server and the users. Your primary focus will be development of all server-side logic, definition and maintenance of the database, and ensuring high performance and responsiveness to requests from the front-end. You will also be responsible for integrating the front-end elements built by your coworkers into the application. A basic understanding of front-end technologies is therefore necessary as well.


  • Integration of user-facing elements developed by a front-end developers with server side logic
  • Integration of external platform and libraries
  • Building reusable code and libraries for future use
  • Optimization of the application for maximum speed and scalability
  • Implementation of security and data protection Design and implementation of data storage solutions

Skills Required:

  • Proficient knowledge of a back-end programming language Java/Groovy, with a good knowledge of its ecosystems
  • Familiarity with concepts of MVC, JDBC, RESTful, and Microservices
  • Experience with frameworks, such as Micronaut/Grails/SpringBoot
  • Doświadczenie z frameworkami, takimi jak Micronaut, Grails i SpringBoot
  • Experience with databases (MySQl, MongoDB, Redis, ElasticSearch)
  • Knowledge of Reactive Streams Programming(RxJava2/Project Reactor)
  • Understanding accessibility and security compliance based on microservices
  • User authentication and authorization between multiple systems, servers, and environments
  • Integration of multiple data sources and databases into one system
  • Management of hosting environment, including database administration and scaling an application to support load changes
  • Data migration, transformation, and scripting
  • Setup and administration of backups
  • Outputting data in different formats
  • Basic understanding of front-end technologies and platforms, such as JavaScript, HTML5, and CSS3
  • Understanding differences between multiple delivery platforms such as mobile vs desktop, and optimizing output to match the specific platform
  • Creating database schemas that represent and support business processes
  • Implementing automated testing platforms and unit tests
  • Proficient understanding of code versioning tools, such as Git
  • Proficient understanding of OWASP security principles
  • Understanding of “session management” in a distributed server environment

Other work attributes:

  • Atlassian tools: JIRA, Confluence, BitBucket
  • Unit testing
  • Integration tests
  • Continuous Integration: Jenkins
  • Operating System: MS Windows

About the Project:

Sensfix is a silicon-valley based startup with working team in Poland. We are building a first-of-its-kind, machine-2-service platform that enables every machine & device to automatically search, find and call the nearest service personnel to fix before they break.

B2B Contract: 17 000 – 24 000 PLN gross/month
Employment Contract: 17 000 – 24 000 PLN gross/month

English: minimum B2
Polish: Native

Other Benefits
Employee Stock Option

Job Category: backend Software
Job Type: Full Time
Job Location: Remote Warsaw

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