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Johannes Smidt

@johannessmidt

Fullstack developer crafting backend APIs and Linux cloud infrastructure, with React experience and SaaS product delivery.

South Africa

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What I'm looking for

I’m looking for backend-focused or fullstack roles where I can build strong APIs and production infrastructure. I enjoy owning system design, security, and DevOps, especially for SaaS products that need reliability and clear observability.

I’m a fullstack developer with over four years of experience building backend services and managing Linux-based cloud infrastructure, with three years of frontend development using React. I’m comfortable working end-to-end, but I gravitate toward backend systems, APIs, and infrastructure that are reliable in production.

Recently, I built and launched a SaaS platform independently—covering system design, backend architecture, frontend development, and DevOps. I designed and implemented secure authentication and session handling, encryption (AES-256-GCM), and experimented with hybrid post-quantum models (Kyber768) as part of a security-focused product approach.

In my recent roles, I designed and maintained REST APIs using Python (Flask, FastAPI) and Go (GoFiber). I implemented JWT/cookie/session-based authentication, built background job processing services, and worked with Cassandra and Redis-based caching/data strategies.

I also owned the operational side: Linux (Debian) server management, Docker and Docker Compose, HAProxy reverse proxying, and CI/CD pipelines using Woodpecker and GitHub. For observability, I set up centralized logging and monitoring with Vector, Loki, and Grafana, integrated with Slack alerts, and handled production networking with Cloudflare and AWS.

Experience

Work history, roles, and key accomplishments

Current

Founder & Systems Developer

Current

Truecert Toolkit

Jul 2025 - Present (10 months)

Built and launched a production SaaS platform independently (live since July 2025), covering system design, backend architecture, frontend development, and DevOps. Implemented multi-feature functionality including secure authentication (WebAuthn/FIDO2, TOTP), encrypted handling (AES-256-GCM), Cassandra-based distributed data modeling, Cloudflare/WAF load balancing, and a crypto payments gateway.

Cassandra WebAuthn AES 256 GCM Encryption Cloudflare AWS S3 Docker & VPS Deployment React Typescript TailwindCSS Zustand

Independent Consultant

Devcore Consulting (Pty) Ltd

Sep 2025 - Feb 2026 (5 months)

Provided backend, DevOps, and fullstack development services for a client project, delivering and handing over successfully. Supported end-to-end implementation across application and infrastructure.

Backend Development DevOps Fullstack Development React Docker CI CD

Fullstack Developer

Scriptbit Technology (Pty) Ltd

Sep 2021 - Sep 2025 (4 years)

Designed and maintained REST APIs in Python (Flask/FastAPI) and Go (GoFiber), implementing JWT/cookie/session authentication and background job processing. Built and operated Linux/Docker infrastructure with HAProxy, Redis/Cassandra, and centralized monitoring via Vector/Loki/Grafana and Slack alerts, alongside React admin dashboards.

REST APIs JWT Cassandra Redis HAProxy React CI CD (Woodpecker)

Founder & Systems Architect

Truecert Toolkit

Jul 2025 - Present (10 months)

Independently designed and built the production Truecert SaaS platform, covering fullstack development, distributed Cassandra data modeling, and secure authentication (WebAuthn/FIDO2, TOTP) with encrypted messaging. Managed production infrastructure (Cloudflare, Debian VPS, Docker, AWS S3) and built the React SaaS application with feature architecture and a crypto payment gateway integration.

Cassandra WebAuthn TOTP Authentication AES 256 GCM Encryption Post Quantum Crypto (Kyber768)Cloudflare Docker AWS S3