Natasha Jooste
Software & API Development Architect
Role on the Toyota South Africa modernisation programme. Today Natasha is Co-Founder and Principal Software Architect at Nexus Core Technologies.
Custom Software · Web Apps · APIs · Legacy Modernisation
Custom Software Development in KZN & South Africa, from the South Coast to Gauteng
We design, build and support secure custom software, web applications, API integrations and modernised legacy systems. Based in Margate on the KwaZulu-Natal South Coast, we serve businesses across the whole of KZN, Gauteng, every South African province and selected clients across Africa and worldwide.
Margate, KZN South Coast
Delphi to .NET migration
API & system integration
You own the code
WHAT IS CUSTOM SOFTWARE DEVELOPMENT?
Software built around how your business actually works
Custom software development is the design, engineering and ongoing care of software built specifically for your business processes. Instead of bending your workflows around a generic product, you get applications, portals and integrations that fit how you operate, and that you own.
Off-the-shelf software forces you to adapt your processes to its limits. We take the opposite approach: we study your workflows, then engineer software that fits them. That can mean replacing spreadsheets with a secure web application, connecting systems that do not talk to each other, or modernising an ageing Delphi system without stopping the business.
Our team is based on the KZN South Coast and works across the whole province, from Zululand and the North Coast to Durban, the Midlands and the Lower South Coast, as well as in Gauteng and nationwide. Explore our options by business size, legacy modernisation paths, KwaZulu-Natal coverage or request a quote.
PROVEN EXPERIENCE
Engineers with enterprise modernisation experience
Our co-founders have worked on technology modernisation at enterprise scale. Riaan Terblanche and Natasha Jooste were each individually involved in a modernisation programme for Toyota South Africa in Durban, from assessment of the existing systems through to implementing a roadmap to modernise them.
Riaan Terblanche
Virtualization & Network Platform Architect
Role on the Toyota South Africa modernisation programme. Today Riaan is Co-Founder and Principal Technology Architect at Nexus Core Technologies.
This experience was gained in the founders' individual professional capacity and was not a Nexus Core Technologies engagement. Toyota South Africa is named only to describe the team's background and does not imply endorsement.
Core Software Engineering Services
Complex backend logic, secure databases and intuitive interfaces, delivered from first specification to long-term support.
Custom Business Applications
Software that fits your workflows instead of forcing you to adapt to off-the-shelf limits: internal tools, operations systems, quoting, invoicing and more.
Web Platforms & Client Portals
Secure, scalable web applications and client portals that connect your team, customers and data on any device.
API & System Integrations
Secure REST, SOAP and gRPC APIs that connect accounting, ERP, CRM, courier and payment systems so data stops being re-typed.
Legacy Modernisation (Delphi to .NET)
Staged migration of ageing systems, including Embarcadero Delphi and DataSnap applications, to modern .NET or web platforms without halting operations.
SaaS & Multi-tenant Platforms
Subscription software with tenant isolation, role-based access and billing hooks, built to grow from first customer to thousands.
Reporting, Dashboards & Data
Database design, automated reports and live dashboards that give management one trusted view of the business.
Desktop & Line-of-Business Software
Fast, dependable desktop applications for environments that need local performance, hardware access or offline use.
Maintenance, Security & Support
Code maintenance, security patching, monitoring and feature scaling after launch, so your software keeps pace with the business.
EVERY SIZE OF ORGANISATION
Software Development from SME to Enterprise
We apply the same engineering standards to every project and scale the architecture and database complexity to your operational requirements.
SME Custom Solutions
Replace messy spreadsheets and manual data entry with custom web tools that reduce operational friction.
- Custom quoting and invoicing tools
- Simple client dashboards
- Accounting and CRM connections
- Data capture apps
- Secure hosting and backups
Typically 3 to 8 weeks
Mid-Market Platforms
Bespoke ERP and CRM modules and integrations for growing companies with complex, unique business rules.
- Bespoke CRM and operations platforms
- Inventory and warehouse logic
- B2B ordering portals
- Payment gateway integrations
- Automated reporting dashboards
Typically 8 to 16 weeks
Large Enterprise
Enterprise-grade platforms that run entire operational workflows and replace aging infrastructure.
- Multi-tenant SaaS and enterprise ERPs
- Legacy migrations (Delphi, .NET, PHP)
- High-volume REST and gRPC APIs
- Advanced role-based access control
- Cloud database architecture (Azure / AWS)
Phased, from 3 to 9+ months
Corporate & Public Sector
High-availability, compliance-aware software for financial, logistics, public sector and multinational organisations.
- Microservices and distributed services
- Enterprise service bus integration
- Encryption and POPIA / GDPR-aware design
- Security testing support and audit readiness
- Support agreements with agreed response targets
Scoped and delivered in phases
LEGACY MODERNISATION
Upgrade Ageing Software, Including Delphi to .NET
Outdated, slow or unsupported software is a business risk. We modernise in controlled stages, so you keep trading while the new system takes over.
| From | To | Approach | Typical benefit |
|---|---|---|---|
| Delphi / Embarcadero desktop apps and DataSnap servers | .NET modular monolith or web application | Staged migration. Old and new systems run side by side while modules and data move across. | Supported platform, easier maintenance and modern security |
| Excel and Access-based processes | Secure multi-user web application with a proper database | Capture the existing logic, migrate data, then train staff on the new system. | Single source of truth, audit trail and fewer errors |
| Unsupported PHP or framework versions | Current Laravel or .NET | Refactor in stages, add automated tests and upgrade dependencies. | Security patches, speed and a supported upgrade path |
| Disconnected on-premises systems | Integrated platform linked through APIs | Introduce an API layer, then retire duplicate data entry step by step. | Less double-handling and real-time visibility |
WHY NEXUS CORE
What You Get When You Build With Us
You own the code
Source code, documentation and repositories are handed over, with no lock-in to proprietary tools.
Written scope before work starts
A written technical specification and quote so you know deliverables, timelines and cost up front.
Staging access from week one
Test working modules early in agile sprints, so the build matches your vision.
Secure by design
Input validation, access control, encrypted connections and secure data handling on every project.
Design, build and support in one team
Architects, developers and support engineers work together, so nothing is lost in hand-offs.
Local and remote
On site across KwaZulu-Natal, remote with scheduled visits for Gauteng and the rest of South Africa and Africa.
The Languages & Frameworks We Use
We write clean, documented and testable code on industry-standard frameworks, so your business keeps ownership, performance and room to scale without being locked into obscure platforms.
- Backend & desktop: C#, .NET Core, PHP, Laravel, Node.js, Delphi (Embarcadero)
- Frontend & UI: React, Vue.js, JavaScript (ES6+), FireMonkey, HTML5/CSS3
- Databases: Microsoft SQL Server, PostgreSQL, MySQL
- Infrastructure: Docker, Git, REST/gRPC APIs, DataSnap, Azure, AWS
C#.NET CoreDelphiEmbarcaderoPHPLaravelReactVue.jsFireMonkeyJavaScriptTypeScriptMS SQL ServerPostgreSQLMySQLDockerGitREST / gRPCDataSnapAzureAWS
HOW WE WORK
The Software Development Lifecycle
-
PHASE 01
Discovery & Scoping
We learn your workflows, pain points and goals, then define the architecture and scope in a written technical specification.
-
PHASE 02
Design & Prototyping
We map the database schema, plan the API endpoints and create UI wireframes so you can see the software before coding begins.
-
PHASE 03
Development & Testing
We build in agile sprints. You get staging access to test working modules early.
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PHASE 04
Deployment & Migration
We migrate data from your old systems, run a staged roll-out and train your team on the new platform.
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PHASE 05
Maintenance & Scaling
Software is never truly finished. We provide ongoing maintenance, security patching and feature growth.
Industries We Build Software For
Financial Services & FintechLogistics & TransportHealthcare & Medical PracticesManufacturingRetail & E-commerceReal Estate & PropertyMining & EngineeringTourism & HospitalityAgriculture & Agri-businessEducation & TrainingConstructionLegal & Professional ServicesNGOs & Non-profitsLocal Government & Public SectorTechnology Start-ups
PROOF OF CAPABILITY
Recent Software Projects
Multi-Tenant ERP Dashboard UI
View Project DetailsHOME PROVINCE
Software Developers Across All of KwaZulu-Natal
From Kosi Bay and Zululand in the far north, down the North Coast and through Durban, to the Upper and Lower South Coast, and inland through the Midlands, Battlefields and Drakensberg, we build custom software for KwaZulu-Natal businesses. Our home base is Margate, so South Coast clients get the closest on-site support, and the rest of the province is covered by on-site visits and remote delivery.
- Kosi Bay
- St Lucia
- Richards Bay
- Ballito
- Umhlanga
- Durban
- Amanzimtoti
- Scottburgh
- Port Shepstone
- Margate (HQ)
- Port Edward
North Coast & ZululandSouth Coast
Software Development in Zululand & Elephant Coast
Kosi Bay (Manguzi)Sodwana BayJoziniPongolaMkuzeHluhluweSt LuciaMtubatubaUlundiNongomaVryheid
Software Development in Richards Bay & Empangeni
Richards BayEmpangeniEshoweMtunziniGingindlovuKwambonambiFelixtonMelmothMandeni
Software Development in North Coast (iLembe)
BallitoSalt RockUmhlaliShakaskraalStanger (KwaDukuza)ZinkwaziDarnallTongaatVerulamLa MercyUmdlotiMount Edgecombe
Software Development in Durban Metro (eThekwini)
DurbanUmhlangaLa LuciaDurban NorthBereaMorningsideWestvillePinetownKloofHillcrestGillittsQueensburghChatsworthPhoenixUmlaziIsipingoBluffAmanzimtoti
Software Development in Upper South Coast
KingsburghIllovo BeachWarner BeachWinklespruitUmkomaasScottburghPenningtonPark RynieUmzintoHibberdene
Software Development in Lower South Coast
Port ShepstoneUmtentweniShelly BeachSt Michael’s-on-SeaUvongoMargateRamsgateMarina BeachSan LameerSouthbroomPort EdwardPalm BeachOslo BeachMunsterTrafalgarLeisure BayIzotshaHarding
Software Development in Midlands & Pietermaritzburg
PietermaritzburgHowickHiltonCamperdownCato RidgeRichmondMpophomeniMooi RiverNottingham RoadGreytownWartburgDargle
Software Development in Northern KZN & Battlefields
NewcastleLadysmithDundeeGlencoeEstcourtColensoUtrechtBergville
Software Development in Drakensberg & Southern Inland
WintertonChampagne ValleyUnderbergHimevilleBulwerIxopoCreightonKokstad
GAUTENG
Software Development Across All of Gauteng
From Pretoria and Tshwane in the north, through Midrand, Sandton and Johannesburg, to the East Rand, West Rand and Sedibeng in the south, we build and support software for Gauteng businesses. Workshops, sprint reviews and training run through video calls, with site visits arranged where they add value.
Software Developers in Pretoria & Tshwane
Pretoria (Tshwane)CenturionWaterkloofHatfieldBrooklynMenlynLynnwoodIreneMontanaAkasiaPretoria NorthMamelodiSoshanguveHammanskraalCullinanBronkhorstspruit
Software Developers in Midrand & Waterfall Corridor
MidrandWaterfallHalfway HouseNoordwykKyalamiCarlswald
Software Developers in Johannesburg & Sandton
JohannesburgSandtonRosebankRandburgFourwaysBryanstonRivoniaSunninghillWoodmeadLonehillMelroseLindenBraamfonteinParktownSoweto
Software Developers in East Rand (Ekurhuleni)
Kempton ParkEdenvaleBedfordviewGermistonBoksburgBenoniBrakpanSpringsAlbertonNigelTembisaKatlehongIsando
Software Developers in West Rand
RoodepoortKrugersdorpMuldersdriftMagaliesburgRandfonteinWestonariaFochvilleCarletonville
Software Developers in Sedibeng & South
VereenigingVanderbijlparkMeyertonMidvaalHenley on KlipHeidelbergSebokengEvaton
NATIONWIDE
Custom Software for Every Province
Beyond KwaZulu-Natal and Gauteng, we deliver software for the Western Cape, Eastern Cape, Free State, Limpopo, Mpumalanga, North West and Northern Cape, through remote collaboration, shared project plans and staged releases.
Software Developers in Western Cape
Cape TownStellenboschPaarlGeorgeKnysnaSomerset West
Software Developers in Eastern Cape
Gqeberha (Port Elizabeth)East LondonMthathaMakhanda (Grahamstown)
Software Developers in Free State
BloemfonteinWelkomBethlehem
Software Developers in Limpopo
PolokwaneTzaneenMokopane
Software Developers in Mpumalanga
Mbombela (Nelspruit)eMalahleni (Witbank)Secunda
Software Developers in North West
RustenburgMahikengPotchefstroom
Software Developers in Northern Cape
KimberleyUpington
BEYOND SOUTH AFRICA
Remote Software Development Across Africa & Worldwide
We deliver custom software to African organisations and to clients in the UK, USA, Australia and New Zealand. Regular video calls, written progress updates and clear milestones keep projects on track across time zones, and our designs allow for variable connectivity and local data protection laws.
Software Developers for Southern Africa
NamibiaBotswanaZimbabweZambiaMozambiqueMalawiEswatiniLesothoAngola
Software Developers for East Africa
KenyaTanzaniaUgandaRwandaEthiopia
Software Developers for West Africa
NigeriaGhanaSenegalCôte d’Ivoire
Software Developers for North Africa
EgyptMoroccoTunisia
Software Developers for Central Africa
DR CongoCameroon
Global Markets
United StatesUnited KingdomAustraliaNew Zealand
QUESTIONS
Software Development FAQ
What is custom software development?
Custom software development is the design and building of software tailored to your business processes, rather than adapting your processes to off-the-shelf software. It can include business applications, web platforms, integrations and modernised legacy systems.
Do you have software developers on the KZN South Coast?
Yes. Our team is based in Margate on the KwaZulu-Natal South Coast and works on site with businesses from Port Edward and Port Shepstone up to Scottburgh, Durban and the North Coast.
Do you serve all of KwaZulu-Natal?
Yes. We work across the whole province, from Kosi Bay, St Lucia and Richards Bay in the north, through the North Coast, Durban, Pietermaritzburg and the Midlands, to the Drakensberg, Kokstad and the South Coast. We meet on site where it helps and work remotely otherwise.
Do you work with businesses in Gauteng?
Yes. We build and support software for clients in Johannesburg, Sandton, Pretoria, Centurion, Midrand, the East and West Rand and Sedibeng. Workshops and progress reviews run through video calls, with site visits arranged where they add value.
What types of software do you build?
Custom business applications, web platforms and client portals, REST and gRPC APIs, system integrations, multi-tenant SaaS, reporting dashboards, desktop software and legacy modernisation.
Can you migrate our Delphi application to .NET?
Yes. We migrate Embarcadero Delphi and DataSnap systems to modern .NET or web platforms in stages. Old and new systems can run side by side while modules and data move over, so day-to-day operations are not interrupted.
Can you replace or upgrade our system without downtime?
In most cases, yes. We plan staged migrations with parallel running, data validation and a tested rollback path. The cut-over is scheduled at a time that suits your business.
Can you integrate with our accounting, ERP or CRM software?
Yes. We build secure API integrations so orders, stock, customers and invoices flow between your custom software and accounting packages, ERPs, CRMs, couriers, payment gateways and SMS or WhatsApp providers.
How is a software project priced?
Pricing depends on scope. After an initial conversation we provide a written proposal with deliverables, timelines and costs, with larger projects estimated in phases. Request a quote and we will advise on the right approach.
How long does it take to build custom software?
Small automation tools often take 3 to 8 weeks, mid-market platforms 8 to 16 weeks, and enterprise systems are phased over several months. You receive a timeline in the proposal.
Do I own the source code?
Yes. You receive the source code, documentation and repository access at handover. We do not lock you into proprietary systems.
Is the software you build secure and POPIA-aware?
Security is part of the design from the start: input validation, access control, encrypted connections, audit trails and secure data handling. POPIA is a legal framework, so we build the technical safeguards and work alongside your attorney or information officer.
Do you provide support after launch?
Yes. We offer maintenance, security patching, monitoring and feature development under a support agreement. Hosting is available through our hosting services or on your own infrastructure.
Should I build custom software or buy off the shelf?
Off-the-shelf software suits standard processes. Custom software makes sense when your workflows are unique, when integrations are complex or when licence fees outweigh the cost of owning your system. We run an honest build-versus-buy review as part of our solutions architecture work.
Do you work with clients in other African countries or overseas?
Yes. We deliver software remotely for organisations across Africa and in the UK, USA, Australia and New Zealand, with regular video calls and written progress updates suited to your time zone.
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