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Datafin

Senior Back-End Software Developer - JHB

Datafin

  • R Undisclosed
  • Permanent Senior position
  • Johannesburg
  • Posted 17 Oct 2025 by Datafin
  • Expires in 28 days
  • Job 2625098 - Ref 26703
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About the position

ENVIRONMENT:

Our client, an AgriTech start-up with offices in Johannesburg, is seeking a Senior Back-End Developer to help build a robust and scalable SaaS platform for the agricultural sector. They are looking for a pragmatic, solution-oriented developer who thrives on creating tangible value through software. The role focuses on designing, implementing, and maintaining core business logic, APIs, and data storage systems, while developing high-quality, scalable code and collaborating with cross-functional teams. Strong experience in Ruby on Rails, technical leadership, architecture, and managing large codebases is highly valued, alongside a passion for problem-solving and building impactful software solutions.

DUTIES:

  • Design, develop, and maintain the core Ruby on Rails API and application logic.
  • Design and implement GraphQL APIs to efficiently serve internal and external front-end clients and services.
  • Manage the full application lifecycle, including deployment and maintenance on cloud infrastructure such as AWS and Heroku for APIs and background workers.
  • Maintain and improve data storage strategies, researching sharding and other concepts, as well as different database/storage types (e.g., PostgreSQL, MongoDB, Snowflake).
  • Write maintainable, production-ready code while adhering to software development best practices, including thorough testing and security.
  • Conduct deep-dive R&D and architect scalable solutions to complex data and business logic problems.
  • Support the continuous improvement of development practices and the technology stack.
  • Collaborate with front-end developers to ensure smooth API integration and optimal performance.
  • Say your say! They drive a culture of knowledge sharing in workshops/etc. and are always open to questions and feedback on topics like implementation details and product direction.

REQUIREMENTS:

Education:

  • Preferably a degree in Computer Science, Mathematics, Engineering, or Information Systems.

Knowledge, Skills & Experience

  • They require that you have a passion for working in/learning the below, and proficiency is beneficial.
  • Relevant Experience: 5+ years of professional experience in back-end development.

Required Proficiency/Passion:

  • Strong proficiency in Ruby on Rails for API and application development.
  • Expertise with relational databases (e.g., PostgreSQL) and writing complex SQL.
  • Experience designing and building GraphQL APIs.
  • Familiarity with cloud infrastructure for deployment and maintenance (They run predominantly on AWS and Heroku).
  • Experience with Git/GitHub for source control and CI/CD.
  • Experience with Agile development methodologies.

Beneficial Experience:

  • Experience with distributed data processing via ETL/similar processes.
  • Familiarity with other databases/storage types (e.g., MongoDB, Snowflake).
  • Experience using Docker for local development.
  • Contributions to open-source projects or participation in relevant back-end communities.

                 

ATTRIBUTES:

  • Strong problem-solving and debugging skills
  • Excellent teamwork, collaboration, written, and verbal communication skills.
  • Ability to handle multiple projects and prioritize tasks effectively.

While we would really like to respond to every application, should you not be contacted for this position within 10 working days please consider your application unsuccessful.

COMMENTS:

When applying for jobs, ensure that you have the minimum job requirements. Only SA Citizens will be considered for this role. If you are not in the mentioned location of any of the jobs, please note your relocation plans in all applications for jobs and correspondence. Apply here [URL Removed] e-mail a Word copy of your CV to [Email Address Removed] and mention the reference number of the job.

Desired Skills:

  • Senior
  • Back
  • End

Apply Now

Datafin

About the agency

Datafin Recruitment was established in 1999 and is one of South Africa’s leading Recruitment companies. Owned and managed by two sisters Lindy and Bev Sollinger, we focus on connecting with both our clients and candidates in an authentic conscious meaningful manner. We focus on the Tech, Digital/Online, Data, Finance and HR industries.

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