OPEN POSITIONS

Full-stack developer for Sentinel Hub  

Front-end developer for Sentinel Hub  

Dev ops / system administrator  

Java developer  

 

Full-stack developer for Sentinel Hub

We are looking for full-stack developers, who do not mind getting their hands dirty with a combination of (mostly) back-end, (some) front-end and (a bit of) DevOps. Sentinel Hub is a world-renowned service for distribution of satellite data, processing hundreds of millions of requests on 20PB+ archive every month. The system is proportionally complex, based on micro-services spawn over tens (sometimes thousands) of virtual machines running on AWS and four other clouds. Young minds with some actual working experience would fit best in our team. Geeks who appreciate a challenge of writing a code so that it really works, at scale, are super welcome.

The back-end of Sentinel Hub is implemented in Java, front-end in React. We use a modern approach to software development although we do not run after every new shiny thing.

We are based in Ljubljana, Slovenia, but remote work is also a possibility.

Your tasks:

  • design and develop RESTful APIs and other web services,
  • integrate these with utility client apps,
  • conduct code reviews,
  • write automated tests,
  • write technical documentation (APIs are used by thousands of developers around the world).

Tech stack:

  • Java 11 for the backend (JAX-RS, CDI, Jackson),
  • ­PostgreSQL for database (vast majority of data is on S3, but some meta-data are essential),
  • ­Git/GitLab for code versioning and code reviews,
  • JUnit for unit and integration tests,
  • Gradle for automated builds,
  • Docker for containerisation,
  • Jenkins for CI,
  • ReactJS for the web apps (Sentinel Hub is about APIs but there are some apps to help users).

Key qualifications:

  • (as we are also looking for young developers, we do not really expect you to have all these skills already; the first and the last are must, the rest is probably more a description of what a person should learn by working with us),
  • actual working experience in SW dev, e.g. 1-2 years,
  • good understanding of software architecture, data structures, and algorithms,
  • comfortable with professional software engineering best practices,
  • understanding of OOP and enterprise design patterns,
  • experience with REST / stateless API design and microservices architectural style,
  • passion for quality and an optimal user experience,
  • drive to really understand what is going on.

Front-end developer for Sentinel Hub

We are looking for frontend developers with an interest in Earth Observation to develop applications on top of Sentinel Hub, like EO browser and  Sentinel Playground and (cannot reveal it yet, come to see it first-hand). We use React for web applications built on top of various APIs and we need help expanding their features. We value your potential to learn new skills more than the skills you currently possess!

Your tasks:

  • design, develop and test reusable UI components for Sentinel Hub use cases,
  • ­integrate RESTful APIs in the UI,
  • ­maintain and extend existing Sentinel Hub applications and create new ones,
  • ­work closely with our remote sensing experts for application development and use case examples,
  • ­integrate use case applications in Euro Data Cube tech stack,
  • ­create prototypes for internal, public and customer applications and further develop these.

Tech stack:

  • React for view rendering,
  • ­Leaflet for interactive maps,
  • Redux for state management,
  • Sass / CSS modules for styling,
  • Jest for unit tests,
  • Python + Flask for occasional backend service,
  • Docker for containerization,
  • Git for version control,
  • GitLab CI for one-click deployments.

Key qualifications:

  • ­experience in vanilla JavaScript,
  • ­working knowledge of HTTP, REST, JSON, and modern HTML5/CSS3 web technologies,
  • ­practical experience with one or more JavaScript frameworks like React, Vue, Angular,
  • experience with scripting, shell environments, and version control systems,
  • ­ideal qualifications: ES6, React,
  • passion for quality and an optimal user experience,
  • ­self-organised individuals that can work independently,
  • ­­willingness to learn about concepts of remote sensing and image analysis,
  • ­­­experience with any part of the tech stack is a plus, but not mandatory.

Dev ops / system administrator

We need people experienced in setting up and maintaining infrastructure parts of IT systems. We have systems running on AWS processing couple of petabytes of data as well as one on T-Systems, one on OVH and one on Cloudferro, some on data centers of our clients and some in our own small private cloud.

Key qualifications:

  • deep system level understanding of Linux,
  • basic skills in Java (Web Services, REST),
  • experience with java build tools: ant, gradle, maven,
  • experience with microservices architecture, service discovery, Java web service deployment (on Java EAP or lightweight JEE servers),
  • experience with virtualization technologies (xen based) and cloud platforms (OpenStack, EC2, GCP,..),
  • experience with Docker containerization platform,
  • experience with source control management solutions: subversion, git,
  • experience with infrastructure monitoring solutions,
  • passion for discovering problems and system improvement.

Java developer

You will work on our large scale turn-key GIS solutions for Agriculture and Real Estate Management as well as Sentinel Hub core technology.

Your tasks:

  • work with our business analysts to study client's requirements and translate them into well-defined features,
  • design and develop RESTful APIs and other web services,
  • work with our DB developers to integrate with relational and NoSQL databases,
  • work with our UI/UX designers to implement (GIS) user interfaces,
  • conduct code reviews,
  • write automated tests,
  • help support and maintain our existing products.

You will often face complex but interesting problems that will require cutting-edge solutions and a deep understanding of the domain at various levels – from the low-level data processing algorithms all the way to the business processes of the client.

Tech stack:

  • Java 8 for the backend (JAX-RS, CDI, Jackson, JDBC),
  • React or GWT (Java to JavaScript transpiler) for the frontend,
  • Postgres, Oracle, Elastic for persistence,
  • JUnit for unit tests,
  • TestNG for integration tests,
  • Ant for automated builds,
  • Docker for containerisation,
  • Jenkins for CI.

Having experience with any part of the tech stack is a plus, but not mandatory - we value your potential to learn new skills more than the skills you currently possess.

Key qualifications:

  • deep understanding of software architecture, data structures, and algorithms,
  • comfortable with professional software engineering best practices,
  • understanding of OOP and enterprise design patterns,
  • passion for quality and an optimal user experience,
  • strong analytical skills,
  • strong English communication skills.

Preferred qualifications:

  • experience with SQL and relational databases,
  • experience with REST / stateless API design and microservices architectural style,
  • experience with building, deploying, and supporting highly scalable web services and applications,
  • experience with building graphical user interfaces,
  • experience with distributed, asynchronous and concurrent programming,
  • experience with GWT (formerly Google Web Toolkit),
  • passion for technical leadership and mentoring.