01 / Build the Interface
I build clean, responsive web interfaces and form-driven user journeys using React, Next.js, JavaScript, TypeScript, HTML, and CSS/SCSS.
React.jsNext.jsTypeScriptJavaScriptHTMLCSS / SCSSResponsive UIFormsValidation
Jonathan Zietsman
Full Stack Developer &Technical Consultant
I build full-stack applications, integrations, and business workflows using React, Next.js, TypeScript, JavaScript, and Node.js.
Based in South Africa. Preparing for long-term opportunities in Finland.
Looking for full-stack developer roles where I can work across frontend, backend, integrations, and client-facing delivery.
About
From technical problem-solving to full-stack software.
I started in a practical technical environment before moving into software development. That background shaped how I approach systems: I like understanding how things work, where they break, and how to make them better.
Today, I build full-stack web applications, integrations, and business workflows through SandBox Logic. I work directly with clients from requirements and planning through development, deployment, support, and improvement.
My focus now is growing deeper in React, Next.js, TypeScript, Node.js, PostgreSQL, testing, and CI/CD as I prepare for international full-stack opportunities, especially in Finland.
I enjoy building software that is not only technically sound, but genuinely useful to the people relying on it.
Skills
A practical mix of full-stack development, integrations, cloud delivery, and client-facing problem-solving.
02 / Connect the System
I build server-side workflows and API integrations that move data between websites, CRMs, cloud tools, and business platforms.
API IntegrationServer-side API RoutesSalesforce REST APIGoogle Workspace APIsGmail APIGoogle Admin SDKData FlowsCustomer Data
03 / Automate the Workflow
I design business workflows that reduce manual effort, improve follow-up, and connect front-end actions with back-end processes.
CRM WorkflowsLead Intake AutomationBusiness Process AutomationForm WorkflowsAutomated EmailsPDF GenerationFrontend/Backend WorkflowsDocumentation
04 / Deliver with the Client
I work directly with clients and stakeholders to understand requirements, plan practical solutions, support users, and improve systems over time.
Requirements GatheringClient CommunicationStakeholder CoordinationImplementation PlanningTechnical Task BreakdownGoogle AnalyticsPerformance ReportingCampaign Analysis
Tools & Platforms
VercelAWS S3GitAzure FundamentalsGoogle WorkspaceMeta BusinessAI-assisted tools
Demo Lab
Production-style demos and real client workflows that show how I build full-stack systems, integrations, automation, and business-focused software.
ClientOps Hub
Full-stack TypeScript business operations platform
A production-style demo system for managing client requests, internal workflows, dashboard reporting, content updates, and activity tracking. Built to demonstrate frontend development, backend workflows, PostgreSQL data modelling, authentication, search/filtering, testing, CI/CD, and deployment.
What it proves:
Full-stack application structure, React/Next.js frontend, Node.js backend logic, PostgreSQL database integration, admin portal design, search and filtering, CI/CD thinking, and client-facing product delivery.
Next.jsTypeScriptPostgreSQL
View Case Study ->Salesforce Lead Intake & Automation
Website enquiry to Salesforce Lead automation with queue assignment, email notification, and follow-up task creation.
Next.jsSalesforce APIFlows
View Case Study ->Salesforce + Google Workspace Signature Automation
Salesforce-to-Google Workspace integration that previews and updates Gmail signatures using Salesforce user data.
Salesforce APIGmail APIGoogle Admin SDK
View Case Study ->Admissions Workflow System
Real client admissions workflow with applications, uploads, automated emails, calendar events, and PDF records.
Next.jsAWS S3PDF Generation
View Case Study ->Contact
Let's connect.
I'm open to full-stack developer and technical consultant roles where I can build practical software, integrations, and business workflows that solve real operational problems.
Based in South Africa. Open to relocation to Finland
