Johannesburg: Senior Ruby on Rails Developer posted by Datafin

December 6, 2025 Jobs in Central Johannesburg

Job Description

Senior Ruby on Rails DeveloperIT – Software Development
Johannesburg – Gauteng – South Africa

ENVIRONMENT:

Our client a fast-moving, high-growth online loan underwriting company is on the hunt for a Senior Ruby on Rails Developer whos not just great with code but also knows how to lead the way! If you’re someone who thrives on building sleek, scalable web apps front to back, loves clean code, and has a thing for mentoring fellow devs while setting high standards keep reading. They’ve got exciting projects, a passionate team, and a tech stack thats ready for your magic touch. Ideally, youve got 8+ years of Ruby on Rails wizardry under your belt, including at least 2 years leading the charge. A degree in Computer Science is awesome, but if your experience speaks volumes, thats what really counts. If you’re ready to roll up your sleeves and make big things happen this ones calling your name.

DUTIES:

Full-Stack Development:

Design, develop, and maintain high-performance Ruby on Rails applications, handling both backend and frontend components.
Build and optimize RESTful APIs, database schemas, and user interfaces to ensure seamless functionality and user experience.
Implement responsive, accessible frontend designs using HTML, CSS, JavaScript, and frameworks like React, Vue.js, or similar.

Code Quality and Best Practices:

Write clean, efficient, and well-documented code following Ruby on Rails conventions and industry best practices.
Conduct code reviews to ensure consistency, performance, and adherence to coding standards.
Refactor legacy code to improve maintainability, scalability, and performance.

Test-Driven Development (TDD):

Develop and maintain comprehensive test suites using tools like RSpec, Minitest, or Capybara to ensure robust code quality.
Implement best-practice test cases, including unit, integration, and end-to-end tests, to minimize bugs and regressions.
Advocate for and enforce a culture of TDD within the development team.

Leadership and Management:

Lead and mentor a team of developers, providing technical guidance and fostering a collaborative, high-performing environment.
Manage project timelines, delegate tasks, and ensure on-time delivery of features and releases.
Collaborate with product managers, designers, and stakeholders to translate requirements into technical specifications.

System Optimization and Scalability:

Optimize application performance through efficient database queries, caching strategies, and server-side improvements.
Ensure applications are secure, scalable, and maintainable, adhering to best practices for cloud-based deployments.
Troubleshoot and resolve complex technical issues in production environments.

Collaboration and Communication:

Work closely with cross-functional teams to align development efforts with business objectives.
Communicate technical concepts clearly to non-technical stakeholders, providing updates on progress and risks.
Contribute to Agile/Scrum processes, including sprint planning, stand-ups, and retrospectives.

REQUIREMENTS:

Education:
Bachelors degree in Computer Science, Software Engineering, or a related field (or equivalent experience).
Experience:
8+ years of professional experience developing Ruby on Rails applications, with at least 2 years in a senior or lead role.
Proven full-stack development experience, including frontend frameworks (e.g., React, Vue.js, or Angular) and backend systems.
2+ years of technical leadership or management experience, including mentoring developers and managing projects.
Technical Proficiency:
Expert-level knowledge of Ruby on Rails, including MVC architecture, Active Record, and Rails 6/7 features.
Strong experience with relational databases (e.g., PostgreSQL, MySQL) and query optimization.
Proficiency in frontend technologies: HTML5, CSS3, JavaScript, and modern frameworks.
Familiarity with testing frameworks (e.g., RSpec, Minitest, Capybara) and best practices for TDD/BDD.
Experience with version control (Git), CI/CD pipelines, and cloud platforms (e.g., AWS, Heroku, or Azure).
Code Quality:
Demonstrated ability to write clean, modular, and efficient code with a focus on maintainability.
Deep understanding of design patterns, SOLID principles, and RESTful architecture.
Familiarity with code testing applications such as Circle CI and Code Climate.
Bug identification via Airbrake
Soft Skills:
Strong leadership and mentoring abilities, with a track record of building cohesive teams.
Excellent problem-solving skills and attention to detail.
Effective communication skills, with the ability to articulate technical concepts to diverse audiences.
Preferred Qualifications:
BSc Computer Science.
Familiarity with DevOps tools (e.g., Docker, Kubernetes, Ansible) and infrastructure as code.
Contributions to open-source Ruby/Rails projects or a strong GitHub portfolio.
Agile/Scrum certification (e.g., Certified Scrum Developer) or experience leading Agile teams.

ATTRIBUTES:

Technical leadership
Clean code advocacy
Test-driven development
Full-stack expertise
Agile project delivery

Team mentorship

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