Senior Specialist Mobile Developer

Careers at DLK GroupJohannesburg, Gauteng, South Africa

30+ days ago

Job description

Overview

Senior Specialist Mobile Developer – DLK Group, Johannesburg, South Africa. Full time.

Posted on 19 / 08 / 2025.

Job Information

Date Opened : 19 / 08 / 2025
Job Type : Full time
Industry : IT Services
Work Experience : 5-7 years
Salary : Market Related
City : Johannesburg
Province : Gauteng
Country : South Africa
Postal Code : 2000

Responsibilities

Develop mobile applications utilizing Microsoft Xamarin / .NET MAUI mobile development toolset with React Native knowledge

Backend : Web API service-oriented application running on .NET framework utilizing C#

API services integrate with MS SQL database as the data store

Links to numerous API services to integrate into a broad enterprise architecture

Extensive experience with Microsoft mobile applications written in Xamarin and .NET MAUI

Proven track record of delivering mobile application solutions

Experience with app deployments in all three mobile application stores : Apple iOS App Store, Android, Huawei

Work includes support and refactoring of existing code

Support existing mobile applications

Understand existing product and domain elements and work with business analysts to refine and implement requirement changes

Refactor and improve code to keep the product maintainable and adaptable

Evaluate and improve application performance and high availability features

Create unit and integrated system tests to validate functionality

Create and execute functional test scenarios (dev testing)

Write technical documentation explaining system components and usage

Perform root cause analysis on bugs and fix issues in integrated systems

Build and deploy mobile applications via DevOps processes to app stores

Collaborate effectively in a team environment, improving development processes and standards

Minimum Requirements

Relevant tertiary qualification in IT or Computer / Engineering Sciences, OR 8+ years continuous development experience in mobile app development with multiple go-live events

Strong knowledge of Microsoft Xamarin and conversion from Xamarin to .NET MAUI

Experience in .NET MAUI framework and development up to .NET 9

5+ years relevant experience as a senior mobile developer in a multi-tiered .NET environment

Experience with API service integration in mobile apps

Experience coding functionality for mobile device components (camera, geolocation, etc.)

Experience in web browser scripting languages preferred (JavaScript / TypeScript, Angular, ASP, HTML5, React)

Knowledge of REST frameworks involving JSON and XML

Working knowledge of mobile app security vulnerabilities and prevention techniques

Ability to work in a team and translate use cases / user stories into user-friendly applications

Strong understanding of SDLC processes (Agile & Waterfall), tools, and techniques

Technologies & Tools

Xamarin, Xamarin Forms, XAM

.NET MAUI

C# and .NET framework

Mobile store deployments (iOS, Android, Huawei)

Integration (Web / RESTful services)

XML, JSON, namespace management

SQL (MS SQL 2008 onwards)

SoapUI / Postman

React Native : JavaScript, TypeScript, UI design (flexbox)

Node & npm : NodeJS CLI, npm package management

Azure DevOps : repo management, CI pipelines, release

Strong knowledge of OOP principles and design pattern

IDE : Visual Studio, VS Code

REST / SOAP services

Microsoft Application Center

.NET 4.7.2

jQuery, Web API, WCF, Unity, Bootstrap

Technical Expertise

Advanced Mobile Development : Xamarin & MAUI, OOP, multithreading, memory management, performance optimization

.NET Framework : Xamarin, Xamarin Forms, .NET MAUI for iOS, Android, Huawei

RESTful Web Services : Development & consumption of REST APIs (scalability, security, performance)

Mobile Device Component Usage : Camera, geolocation, etc.

App Store Deployment : Apple, Android, Huawei (5+ years)

Security Standards : Identify & resolve mobile vulnerabilities; work with cybersecurity feedback

Project Experience : Enterprise-scale apps (500k+ users, high concurrency)

Industry Experience : Financial / tax services advantageous

DevOps : Azure cloud CI / CD and configuration

Production Diagnostics : Troubleshoot performance & transaction failures

Functional Correctness : Guide development team on best practices

Personal Profile

Self-starter, self-motivated, and team player

Experience managing a development team

Excellent communication & interpersonal skills

Strong attention to detail

Works well under pressure and meets deadlines

Ability to perform root cause analysis under operational pressure

Lifelong learner, adaptable to new technologies

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Senior Developer • Johannesburg, Gauteng, South Africa

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