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Responsibilities:Build, test, and deploy mobile apps using React Native.Develop web portals using React.js and TypeScript.Support existing functionality and develop new components.Understand product and domain elements. Collaborate with business analysts to refine and implement requirements.Refactor and improve code to maintain adaptability and long-term maintainability.Work effectively both independently and within a team, adhering to software development standards and processes.Evaluate and improve application performance and high availability.Create unit and integrated system tests to ensure developed functionality works as intended.Produce technical documentation explaining system components and usage.Perform root cause analysis on bugs and implement fixes in an integrated system.Deploy applications on servers when required.Execute functional test scenarios (development testing).Analyse and enhance existing code and system functionality according to business needs.Manage mobile app stores, developer accounts, and related services.Requirements:Grade 12 / Matric with a relevant tertiary qualification in IT or Computer/Engineering Sciences, or Matric with at least 5 years of relevant development experience.Minimum 5 years experience as a Mobile Developer in a software development environment.Experience using API services to integrate with mobile applications.Experience building API services (.NET Framework) for mobile integration.Experience designing and maintaining relational databases.Proficiency in accessing mobile device components (camera and geolocation) and deploying these features.Ability to mentor team members and work collaboratively.Solid understanding of SDLC processes, tools, and Agile software development methodologies.Skills & Technologies:React Native, React.js, JavaScript, and TypeScriptC#.NET and Microsoft .NET FrameworkMobile store deployments: iOS, Android, and HuaweiAPI integration: Web/RESTful services, XML, and JSONRelational databases: Microsoft SQL ServerAzure DevOps: Repos, CI pipelines, and releasesStrong understanding of OOP principles, design patterns, and best practicesExperience with Google Services, Firebase, and SentryTools: Visual Studio, VS Code, Android Studio, XCode, and SoapUI/PostmanAdvantageous:Experience with .Net Core, Web API, and MVCKnowledge of security vulnerabilities and impact on solutionsExperience monitoring and optimizing mobile app performance and security https://www.executiveplacements.com/Jobs/S/Senior-Mobile-Developer-React-Native-1271503-Job-Search-03-13-2026-00-00-00-AM.asp?sid=gumtree

Executive Placements

Kensington

Graphics & Web Designer (Junior to Mid-Level) mark

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Market Research RandburgGraphics & Web Designer (Junior to Mid-Level) Contract / Freelance Position – Short-term assignment, not permanent IntroductionWe’re looking for a talented and enthusiastic Junior to Mid-Level Multimedia Designer to join our team on a short-term contract. This role is ideal for someone with a strong design foundation who is eager to contribute to both graphic and web-based projects.The ideal candidate will bring fresh, creative thinking, attention to detail, and the ability to turn client briefs into high-impact digital designs. You’ll thrive in a fast-paced environment, work well independently, and bring a collaborative spirit to our creative team. Requirements A qualification in Graphic / Web Design (Diploma, Degree, or Certificate).2+ years of proven industry experience in a similar design role. (Non-negotiable)An up-to-date portfolio showcasing relevant design work. (Please include links if online – non-negotiable)Proficiency in Adobe Creative Suite: XD, Photoshop, Illustrator, InDesign. (required)Strong web design knowledge, including:HTML5, CSS, JavaScript, jQuery, BootstrapResponsive interface designWireframing and layout planningFamiliarity with W3C standards (XHTML1.1 & CSS)Cross-browser UI optimization and speed considerationsExcellent communication skills, especially when engaging with clients and co-workers.Valid driver’s license and own transport is requiredKey ResponsibilitiesDevelop creative concepts and designs based on written or verbal briefs.Take projects from concept through to final delivery, including presentations to clients when needed.Collaborate across design, development, and production teams to ensure smooth execution.Assist with ongoing website maintenance and updates.Liaise with clients to gather feedback, present progress, and manage expectations.Maintain high design standards and take full ownership of your work.Apply creative thinking and contribute ideas to improve workflows and visual output.70% design work / 30% web development. Personal AttributesHighly creative, proactive, and solution-driven.Strong time management skills with the ability to meet deadlines independently.Motivated, energetic, and adaptable in a dynamic work environment.Open to feedback, new ideas, and continuous learni https://www.jobplacements.com/Jobs/G/Graphics--Web-Designer-Junior-to-Mid-Level-market-1205442-Job-Search-07-23-2025-02-00-15-AM.asp?sid=gumtree

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Kensington

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"web developer" in Johannesburg

web developer in Johannesburg (426 results)

Results for web developer in "web developer" in Johannesburg in Johannesburg