API Developer (Senior)

Recruiter:

A 1L Realization (Pty) Ltd

Job Ref:

JHB000998/Tshid

Date posted:

Thursday, July 2, 2026

Location:

Johannesburg, South Africa

SUMMARY:
Our client in the Communications Technology is seeking an API Developer (Senior) on a contract duration of 6 months.

Role Purpose

The Senior API Developer is responsible for designing, building and maintaining secure, scalable and high-performance APIs that expose enterprise data products, analytical insights, customer scores, ADR datasets and machine learning outputs. The role enables controlled access to DataCo’s data and AI capabilities through well-governed API services that support internal systems, partners and external consumers.

POSITION INFO:
Key Responsibilities Design, develop and maintain secure RESTful and\/or GraphQL APIs exposing enterprise data products, insights and ML outputs. Build APIs for customer scores, audience segments, ADR datasets and analytical services. Ensure APIs are scalable, high-performing and resilient under high-volume usage. Implement robust authentication, authorisation and security controls (e.g. OAuth2, JWT, API gateways). Develop API integration layers between data platforms, ML services, portals and external systems. Ensure APIs are well-documented, versioned and compliant with enterprise governance standards. Collaborate with Solution Architects, Data Engineers, MLOps Engineers, Platform Engineers and Full-Stack Developers to deliver end-to-end solutions. Optimise API performance, latency and throughput for real-time and batch consumption scenarios. Support monitoring, logging, troubleshooting and incident resolution for production APIs. Ensure compliance with data privacy, security and regulatory requirements. Participate in Agile delivery ceremonies and contribute to continuous improvement of engineering practices. Qualifications & Experience Bachelor's degree in Computer Science, Information Technology, Software Engineering or a related field. 5-10 years' experience in API development, backend engineering or software engineering roles. Strong experience designing and building RESTful APIs and\/or GraphQL services. Proficiency in backend programming languages such as Java, .NET, Python, Node.js or Go. Experience with API management platforms (e.g. Apigee, Azure API Management, Kong or similar). Strong understanding of microservices architecture and distributed systems. Experience integrating with data platforms, ML services and cloud-based systems. Knowledge of cloud platforms such as Azure, AWS or Google Cloud Platform is advantageous. Experience working in Agile environments. Key Competencies API design and development Secure software engineering Microservices architecture System integration Performance optimisation and scalability Authentication and authorisation frameworks Cloud-native application development Observability and monitoring Data and ML service exposure Agile collaboration and delivery

Similar jobs you might be interested in:

API Developer (Senior)
Location: Johannesburg
Salary:
Our client in the Communications Technology is seeking an api developer (senior) on a contract duration of 6 months. Role PurposeThe senior api developer is responsible for designing, building and maintaining secure, scalable and high-performance apis that expose enterprise data products, analytical insights, customer scores, ADR datasets and machine learning outputs. The role enables control...
Today

Senior Backend Developer (C#) – Centurion /JHB
Location: Centurion
Salary:
15 days ago

Senior SQL Developer (JHB)
Location: Johannesburg
Salary:
17 days ago

Back-End Developer (Senior) 1914
Location: Midrand
Salary:
A dynamic global IT environment is looking for an experienced Back-End developer (senior) to join a high-performing team focused on building scalable analytics platforms and cloud-based data solutions.This opportunity is ideal for a passionate developer with strong Python, AWS, api development, and Data Engineering experience who enjoys working within Agile and DevOps environments.Product Environm...
35 days ago

Senior Front end Developer
Location: Johannesburg
Salary:
58 days ago

Senior Salesforce Developer
Location: Johannesburg
Salary: 50000.00 Monthly
Our client is seeking a senior Salesforce developer to join their team, based fully in-office in Bedfordview. This role is suited to a highly experienced Salesforce professional who is passionate about designing scalable architecture, leading technical solutions, and delivering high-quality enterprise systems.
13 days ago

Salesforce Administrator / Developer
Location: Johannesburg
Salary: 30000.00 Monthly
Our client is looking for a Salesforce Administrator / developer to join their team, based fully in-office in Bedfordview. This is an exciting opportunity for a professional with at least 2 years of experience who enjoys both the technical development and functional administration side of Salesforce.
13 days ago

Salesforce Developer
Location: Johannesburg
Salary: 40000.00 Monthly
Our client is looking for a Salesforce developer to join their team, based fully in-office in Bedfordview. This role is ideal for a developer with strong Salesforce experience, who is passionate about building scalable, high-quality solutions.
13 days ago

.NET Full Stack Developer
Location: Johannesburg
Salary: Monthly
Attention to all .NET developers - An exciting opportunity awaits you. Join a progressive company and grow your career as an advanced developer. If you are looking to advance your career and your skills, then send your profile for this position.
2 days ago

Full Stack .NET Desktop Developer
Location: Johannesburg
Salary:
We are seeking an experienced Full Stack .NET Desktop developer to join our team. The ideal candidate will have expertise in WinForms, C#, VB.NET, ASP.NET Core, Web api, and a range of related technologies. You will be responsible for developing and maintaining both desktop and web applications while working with Microsoft SQL Server, WCF, entity framework, and Windows services. This role offers a...
Today