Senior Back End Developer - SQL - Edenvale

Avatar Advisory - Avatar Human Capital; Johannesburg; Hybrid; ZAR 600 000 - 800 000; Full time

Job summary

A technology consulting firm in South Africa is seeking a Senior Back-End Developer with strong SQL expertise. This role focuses on designing, developing, and maintaining scalable back-end applications while collaborating with cross-functional teams. Applicants should have over 5 years in back-end development, advanced SQL proficiency, and experience with languages such as C#, Java, Python, or PHP. Mentoring junior developers is a key component of this position, making it ideal for leaders in the field.

Qualifications

• 5+ years of experience in back-end development.
• Advanced proficiency in SQL (MS SQL / MySQL / PostgreSQL).
• Strong experience with back-end languages such as C#, Java, Python, or PHP.

Responsibilities

• Design, develop, and maintain scalable back-end applications.
• Develop and optimise complex SQL queries, stored procedures, and database schemas.
• Ensure data integrity, performance, and security across systems.

Skills

Back-end development

SQL expertise

C# or Java or Python or PHP

API development

Mentoring

Education

Bachelor’s degree in Computer Science, IT, or related field

Tools

Docker

Kubernetes

Git

Job description

Senior Back End Developer

Position Area: RandPark Ridge

K6-8 years Back End Developing experience

At least 3 years in Senior position Hybrid

2 years Docker/Kubernetes experience

5 years developing APO’s for FE Development

3 years Agile/scrum framework

5 years SQL

We are seeking a highly skilled Senior Back-End Developer with strong SQL expertise to design, develop, and maintain robust back-end systems. The successful candidate will play a key role in system architecture, database optimisation, and mentoring junior developers while working closely with cross-functional teams.

Key Responsibilities

• Design, develop, and maintain scalable back-end applications
• Develop and optimise complex SQL queries, stored procedures, and database schemas
• Ensure data integrity, performance, and security across systems
• Integrate front-end elements with server-side logic
• Participate in system architecture and technical decision-making
• Troubleshoot, debug, and resolve application issues
• Conduct code reviews and enforce best development practices
• Mentor junior and mid-level developers
• Collaborate with business analysts, product owners, and QA teams

Minimum Requirements

• Bachelor’s degree in Computer Science, IT, or related field (or equivalent experience)
• 5+ years’ experience in back-end development
• Advanced proficiency in SQL (MS SQL / MySQL / PostgreSQL)
• Strong experience with back-end languages such as C#, Java, Python, or PHP
• Experience working with APIs (RESTful services)
• Solid understanding of database design, indexing, and performance tuning
• Experience with version control systems (Git)
• Strong problem-solving and analytical skills

Advantageous Skills

• Experience with cloud platforms (AWS, Azure, or similar)
• Knowledge of microservices architecture
• Experience in Agile / Scrum environments
• Exposure to DevOps and CI/CD pipelines

Competencies

• Strong attention to detail
• Excellent communication and teamwork skills
• Ability to work independently and manage multiple priorities
• Leadership and mentoring capability