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Lester F. — Senior .NET API Developer from South Africa

Lester F.

Senior .NET API Developer

South Africa 6+ years
Open to offersNew to Platform
Languages
EnglishDutch
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About

Lester F. is a highly accomplished Senior API & Full-Stack Developer with over 25 years of expertise in enterprise-level software engineering. He has a profound technical mastery of the Microsoft ecosystem, specializing in RESTful API Design, microservices architecture, and secure software development across the financial, insurance, and corporate sectors. Working fully remotely from Johannesburg, South Africa, Lester has significantly contributed to optimizing backend performance and leading agile teams in building scalable applications. He excels in securing applications using OWASP standards and is adept at languages like C# and frameworks like .NET Core and Azure DevOps. Lester's portfolio includes architecting mobile applications, designing complex line-of-business systems, and managing cloud integrations with Office 365 at major companies such as Hollard Insurance and Standard Bank South Africa. His academic credentials include Microsoft Certified Professional certifications, and he holds extensive experience in mentoring aspiring developers.

Experience

  • Senior Full-Stack Developer

    MMS Africa · 2025 — Present
    Architected and implemented a secure Biometric Authentication Mobile Application and its corresponding API services. Developed an AI Image Enhancer integration optimized for Unix-based architectures. Employed C# for backend service logic, along with SQL and SSIS for relational database management and ETL processes. Created JavaScript-based integration APIs intended for seamless interaction with the Wix eCommerce platform.

  • Senior Full-Stack Developer

    R3Developers Ltd. Pty · 2024 — Present
    Engaged in designing and constructing a core Line-of-Business (LOB) automated system aimed at managing supplier data extractions from external REST APIs. Achieved integration of enterprise data feeds into a JavaScript-based eCommerce product store ecosystem. Leveraged Camunda BPMN workflows to visualize complex LOB processes and ensure system governance while maintaining a technical implementation stack consisting of C#, SQL, SSIS, and frontend integration components.

  • Senior API Developer

    Hollard Insurance (via HCL / Ampstek) · 2023 — 2024
    Maintained, extended, and refactored crucial C# .NET Core APIs to guarantee optimal data delivery with minimal latency. Conducted structured debugging and created comprehensive maintenance patterns alongside rigorous performance testing using Visual Studio, Postman, and DotNet Counters. Designed and managed integrations with Office 365 ecosystems utilizing the Microsoft Graph API.

  • Software Developer (Hybrid)

    Dotcom Software (BCX Client: Net2Africa) · 2022 — 2023
    Managed and extended .NET Core API components as well as a cross-platform Flutter Mobile application and a Nuxt Vue web application. Provided development and maintenance support across internal client .NET applications and SQL databases.

  • Senior Developer

    MiPrint Consulting (Standard Bank South Africa) · 2022 — 2022
    Led the upgrade, refactoring, and performance optimization of essential Fraud Management Services and specialized .NET Core APIs. Delivered projects across the entire Software Development Life Cycle (SDLC) using a tech stack focused on .NET 6.0 and .NET Core. Developed local Docker containers to streamline microservice containerization and testing routines, while building and configuring pass-through APIs for deployments via Azure DevOps CI/CD pipelines.

  • Full-Stack Developer

    Freelance Consultant · 2021 — 2022
    Executed comprehensive SDLC frameworks for a confidential, cross-platform Project Management System using .NET 6 and Blazor WebAssembly (WASM). Orchestrated advanced UI behaviors employing responsive HTML, CSS, and modern web architectures. Adhered to OWASP Top 10 Application Security standards, performing regular vulnerability assessments and penetration tests.

  • Senior Developer (Remote)

    Saratoga (Standard Bank South Africa) · 2021 — 2021
    Contributed to enterprise Disaster Recovery (DR) refactoring strategies and participated in major cloud migration initiatives. Upgraded legacy banking services to modern .NET Core APIs and facilitated the initial builds for core banking groups. Implemented distributed systems using C# .NET, Service Fabric, and .NET Core within ASP.NET microservices.

  • Senior Developer / Team Lead

    GoSite Solutions · 2019 — 2020
    Developed a responsive ASP.NET web application for use in digital listings and transaction submissions across both desktop and mobile platforms. Oversaw full-stack workflows with C# .NET, ASP.NET, Azure CLI, Visual Studio 2019, SQL Server 2012, SSRS, and PowerBI.

  • Specialist Developer

    Penta Consulting (Client: Johannesburg Stock Exchange - JSE) · 2019 — 2019
    Created an ASP.NET application designed for managing complex financial instruments and client administration protocols. Administered technical structures under Agile methodologies such as daily Scrum and Sprint planning. Utilized Visual Studio 2019, SQL Server 2012, PowerBI, and Docker architectures.

  • Senior Developer

    Consilium Solutions (MMI) · 2019 — 2019
    Developed ASP.NET web tools for portfolio management, utilizing SQL 2012.

  • Senior Developer

    Hollard Group Risk · 2018 — 2019
    Engineered Quote Management systems using Microsoft Workflow Foundation and ASP.NET.

  • Senior Developer / Team Lead

    Reverside · 2018 — 2018
    Maintained legacy ASP.NET EasiPol systems for funeral policy management within an Agile framework.

  • Senior .NET Developer

    Apprentice Valley (Vodacom Client) · 2018 — 2018
    Refactored Vodacom's Core Payment Gateway to meet PCI 3.1 Compliance utilizing WCF, .NET Framework 4.7.2, and Windows Server services.

  • Team Leader

    E4 Strategic (Standard Bank Client) · 2017 — 2017
    Led the Credit Pod team, managing four distinct client projects with a focus on C# .NET and aligning with Agile sprint methodologies.

  • Senior Developer C#

    Wunderman · 2016 — 2017
    Developed enterprise web platforms using Umbraco and UCommerce stacks.

  • Senior Developer

    Cindy Financial Services (Self-Employed) · 2016 — 2016
    Engineered a custom call center web framework incorporating responsive Bootstrap UI, Linq to SQL, and ADO.NET.

  • Senior Web Application Developer

    Sebata Municipal Solutions · 2015 — 2015
    Optimized enterprise municipal asset and supply chain modules by refactoring data layer mapping from Entity Framework 6 to Linq to SQL, significantly improving execution times.

  • Senior Developer

    Ntates Sat Lab / Eikos Risk Applications / Golden Rule · 2013 — 2015
    Designed Customer Self-Service Portals, technical field interfaces, and Windows Store Applications using XAML, EmberJS, and Telerik tools.

  • Web Developer & Consultant

    LE Bros / Bchange / Kalahari.com / 8ta · 2011 — 2013
    Structured multi-user e-procurement management utilities and cookie management protocols for mobile sites, as well as developed reporting components using Crystal Reports.

  • Contract Developer

    Sanlam / Accenture / Sybase / Connection42 · 2007 — 2010
    Built bulk claims integration platforms and result-slip scanning software for the IEC, conducted mobile data integrations using iAnywhere, and managed applications relevant to the JSE's BDA system.

  • C# Technical Trainer

    Dynamix Computer Training Centre · 2006 — 2006
    Mentored and trained candidates towards obtaining formal MCSD certifications in C# programming, ADO.NET, and XML technologies.

  • Systems Engineering & Support

    Execuprime / Intertrading Group / Grand Print / Liberty Properties / Hollard · 1995 — 2005
    Managed Windows Server environments (2000/2003 AD) and Exchange services, developed early-stage software with PowerBuilder, and established corporate database configurations with MS SQL Server.

  • Course Facilitator

    Riverlea Resource Center · 1993 — 1994
    Managed and facilitated courses on fundamental computer technology across both Windows and Apple frameworks.

Skills & Expertise

3D Designer / ModelerArchitectural ServicesC# ExpertLanding Page DesignerASP.NET DeveloperAndroid DeveloperWixSourcing Specialist

Education

  • Matriculation Certificate
    Sukses College Distance Learning · — — 1990