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MARS Solutions Group was incorporated by a team of highly-skilled software architects with strong business acumens. The company began and grew successfully during the recessionary years of 2008-2010, a time period when many competitors were either shunning the industry or downsizing. Continue reading...

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Java back-end developer

Location: Milwaukee, WI
Date Posted: 05-25-2018


Looking for senior Java or C++ software engineers experienced in SOA and/or Data Distribution Services. Candidates need to 
have strong design as well as implementation skills in these or equivalent areas. Need to support the entire software 
development lifecycle from requires, design, implementation and testing. Testing will involve implementing automated testing at 
both the software unit as well as system level using technologies such as BDD, xUnit and custom tools.


Individual will work within an existing software engineering team. The team follows an Agile Scrum process for planning and 
executing tasks on a 3-week Sprint cadence. Work within a Sprint falls into one or more of the following areas: 
Creating and documenting software designs 
Holding design and code reviews 
Implementation of new software functionality 
Implementation of fixes for software bugs 
Implementation of automated unit tests (e.g. JUnit) 
Implementation of automated BDD tests 
Implementation of performance and reliability tests 
Documenting and executing manual test procedures 
Required Skills 
Strong Java or C++ design and implementation skills for backend services 
Experienced with service-oriented architectures and microservices 
Experienced with Docker and Docker containers 
Experienced with using Spring Boot 
Experienced with implementing RESTful web services 
Able to develop in a Linux-based environment 
Able to develop using Git for software configuration management 
Able to implement automated tests using BDD and xUnit frameworks 

Desired Skills 
Experience with the Data Distribution Services (DDS) standard or similar 
Experience debugging memory leaks within C++ or Java applications 
Experience with using REST UI front-ends 

Additional Context 

These contractor positions will be joining an existing software development team. The software development team is one of 
many teams working on the AMS program developing a new patient monitoring system. The new patient monitoring system 
consists of three basic subsystems: 
1. Hub - A mobile device that acquires and displays physiological data for a single patient. 
2. Viewer - A web-based viewer application that allows clinicians to view multiple patients by displaying the data provided 
by each Hub associated with each patient. 
3. Platform - A collection of microservices that provide the backend functionality that support the Viewer and Hub 
subsystems. 
The work for this team falls into general areas: 
Core Microservices & Communication Library 
This team works solely on the Platform subsystem and is responsible for delivering the follow core Software Units: 
Core Communication Library - This library is based on the Data Distribution Service (DDS) standard. Communication 
between microservices, Hubs and Viewers leverage the DDS publish and subscribe framework to exchange real-time 
data encoded in a proprietary format. 
Patient Management Microservices - A collection of microservices that provide the ability to associate a Hub to a patient 
allowing other services like the Viewer to determine what Hubs and patients are currently being monitored within the 
overall System. 
Configuration Microservice - A microservice that is responsible for providing the default configurations for the System. 
For example, the Hub will consult this microservice to determine how it should configure itself within the System as well 
as default patient monitoring configuration settings. 
Much of the implementation of these Software Units are in place, however the AMS Program is still in the early phases of 
overall system integration. Therefore, much of the work involves creating automated white and black box tests using BDD and 
xUnit frameworks. Additionally, the team is involved with investigating, root causing and fixing issues that are discovered as 
part of system integration testing. These issues could be related to functional failures, performance bottlenecks or resource 
leaks. 
Platform Subsystem Test Tool 
The team is responsible for building a custom standalone test tool used to automate or semi-automate Subsystem level test 
scenarios. These test scenarios are intended to ensure the integrated Platform Subsystem is functioning as expected, 
performance is stable over time and is reliable under various stress conditions (e.g. network failures, component failures, 
accelerated use). 
The standalone test tool include mock implementations of the Viewer (Java) and Hub (C++) subsystems. These mock 
implementations are dockerized and have a REST-based interface which allows automated scripts to be written for the various 
test scenarios. Tests scenarios and mock instances are orchestrated using a framework based on Spring Boot (Java). 
There is also a request to put a UI front-end on top of this tool which would allow a user to manually configure the mock 
instances of the Viewer or Hub. The current thought is to leverage a third-party tool for this (e.g. Postman), since their 
interfaces would be REST-based.
 
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