About Us

Concurrent Systems, founded in 2005 has grown from humble beginnings to a thriving business employing over 60 staff members.

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WORK TIME: 08:00 - 17:00
FIND US: South Africa
CONTACT: +27 (0)11 253 3690 / +27 (0)83 922 7136

Senior JavaScript Developer

WANTED: Senior JavaScript Developer


Concurrent Systems builds software products to enable mobile operators to create advanced subscriber benefit provisioning solutions. 

We are seeking a seasoned and highly skilled JavaScript to join our team. If you are a match to the requirements below  send your application to careers@concurrent.systems

We are excited to chat to you!



INTERNATIONAL – footprint in Africa, the Middle East and Asia BUILDER – has a solid, proven track record of building and maintaining software products
TELECOMS – marketing software to mobile network operators MOVER AND SHAKER – actively codes and works on a wide range of projects, communicating ideas, solution finding, and consistently updating your skill set
DYNAMIC – competitive in the industry via leading-edge innovation (agile environment, kanban, scrum, lean) and thought leadership. COMMUNICATOR – shows thought leadership by communicating, mentoring, knowledge sharing, and assisting technical and non-technical colleagues
TECH – is our life’s blood, and engineers are the heart that pumps it OWNER – takes full ownership of all aspects of software products (architecture, quality, user-experience)
PRODUCTS – Electronic Credit Distribution System; Mobile selfcare digital shopfront for network benefits and offerings; Service Creation Environment; High performance USSD gateway and SMSC MASTER – extensive experience that has resulted in mastery of Java, JavaScript/TypeScript/Node.js., operating systems architecture and high performance software
CULTURE – we give our employees a place where they feel at home and they are free to be themselves and excel. We practice Holacracy as a governance method FORMALIST – is disciplined, process-driven and thrives in a structured environment
TALENT – focused on sourcing and retaining the cream of the crop and developing employees and future leaders of the industry INNOVATOR – develops innovative software solutions and works with new and dynamic technologies
SALARY – we compensate competitively for high calibre candidates TEAM PLAYER – teams up with other talented engineers, designers, product owners and other stakeholders. Wants to be part of a team of exceptionally talented, creative, confident, thoughtful people who are enthusiastic about reaching their goals and collaborate to create great things

Job Specification:

The successful candidate will be responsible for the following:

  • Development of Telecommunication Services in a Unix/Linux based environment, from specification through design, coding, debugging to deployment
  • Effectively using tools and ingenuity to identify and fix defects before they become a problem
  • Working in an agile development environment following Scrum methodologies. 
  • Rapidly addressing issues and fixing defects discovered during testing or in production
  • Taking responsibility for software lifecycle management including version control and deployment package creation
  • Demonstrating commitment to process, production and maintenance of accurate design and code documentation
  • Developing and running unit tests to test existing and new functionality before it is committed to the source repository.
  • Rendering third line support and rendering guidance material for third party software in a production environment

Minimum Requirements

The following minimum requirements are a prerequisite for applying for this vacancy:

  • A bachelor degree in computer science or engineering/related discipline or an equivalent combination of education and work experience,
  • Minimum of 3-5 years experience working as a Software Engineer, Developer or Programmer
  • Experience doing development using an environment such as Node.js and JavaScript programming language Experience doing front-end development using Node.js/JavaScript/HTML and CSS
  • Experience with Source/Version control management (Git, SVN,  …)
  • Experience writing unit tests for software you develop

Technology Stack 

Concurrent Systems works primarily with the following technologies and you will be expected to learn any relevant technology that you may not already be familiar with (as required for your specific role):

  • Back End: JavaScript, Kotlin,, Node.js, Docker, Kubernetes, KNative
  • Front End: JavaScript, jQuery, HTML, CSS, Bootstrap, vue.js
  • Scripting Languages: Python, Bash
  • Databases: MySQL/MariaDB, MongoDB
  • Build Tools:NPM
  • Version Control: Git, Gitlab
  • Protocols: REST, JSON-RPC, XML-RPC, SOAP
  • Operating System: Linux (RHEL)
  • Other Tools: Gitlab-CI, , Ansible


The successful candidate will possess the following skills and capabilities:

  • Analytical, technical and problem-solving skills
  • CSS, HTML experience an advantage
  • Working knowledge of a Linux development environment, preferably RHEL will be advantageous
  • Experience in designing and developing software applications from scratch
  • Ability to document, diagram and verbally describe the application architecture and design
  • Unit testing of the developed software components
  • Motivated, self-starter, who can work as part of a productive, fast-paced team

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