Open to opportunities

John User

@johnuser27

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Full-stack software engineer building secure, connected digital ecosystems.

Kenya

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What I'm looking for

I’m looking to build secure, high-performance digital products end-to-end—front-end experiences, scalable back-end systems, and networking/cyber-security that protect what matters. I want a team that values engineering depth, reliability, and measurable impact.

I’m a software engineer passionate about information systems and technology, driven by curiosity about how digital ecosystems thrive. I build, secure, and connect across the full IT spectrum—from front-end experiences to back-end systems, networks, and cyber-security postures that protect what matters.

Across my work, I’ve architected and deployed micro-frontend applications, engineered real-time communication with WebSocket fallbacks, and improved uptime through rate limiting and IP whitelisting. I also debugged networking issues at the keep-alive layer, cutting retransmission rates by 45%.

I bring a strong data-and-interfaces capability as well: as a Data Engineer, I built high-performance data processing back-ends and APIs, delivered React/Svelte dashboards and analytics portals, and automated ETL into structured JSON datasets. My approach blends engineering depth with practical outcomes—faster operations, clearer data access, and reliable systems.

Experience

Work history, roles, and key accomplishments

Data Engineer

Maitri Capital

Jan 2024 - Jan 2025 (1 year)

Engineered ETL back-end services and APIs using Node.js and Rust, leveraging Rust concurrency for CPU-intensive transformations. Built React/Svelte analytics dashboards, automated data extraction/cleansing/aggregation into JSON datasets, and created a documentation portal dynamically generated from JSON schema definitions.

ETL Node Rust API Engineering Data Pipelines Data Validation React Svelte

Full Stack Developer

Vilcom Networks

Jan 2026 - Present (5 months)

Architected and deployed React/Node.js micro-frontends handling $10M+ in daily transactions. Implemented WebSocket with fallback long-polling to cut real-time notification latency by 62% and improved uptime to 99.99% via reverse-proxy rate limiting and IP whitelisting.

React WebSockets Long Polling Reverse Proxy Rate Limits Network Troubleshooting Security Hardening CDN Origin Debugging

Customer Care Executive

Ison Experiences

Jan 2026 - Present (5 months)

Handled 50–70 inbound calls daily for M-PESA-linked asset financing customers, troubleshooting device and software lock issues and reactivating units remotely. Achieved 88% first-call resolution and reduced repeat warranty calls by 15% through guided troubleshooting and faster reconciliation/escalation handling.

Customer Support Troubleshooting M PESA Statement Reconciliation Remote Device Reactivation Escalation Handling Software Lock Resolution Process documentation First Call Resolution Customer Retention

Frontend Engineer

Harbour Energy Ke

Jan 2023 - Present (3 years 5 months)

Developed responsive React/Svelte front-end applications with reusable UI components and design systems to accelerate delivery across marketing and customer-facing platforms. Optimized performance, accessibility, and SEO, and integrated with APIs, analytics, and CRM tools to support lead generation and improve conversion via A/B testing.

React Svelte UI Components Design Systems Accessibility SEO A B Testing API Integration

Systems Admin

Sizenest Organics

Jan 2022 - Present (4 years 5 months)

Managed on-premise and cloud IT infrastructure, ensuring high availability and performance across servers, network hardware, and enterprise storage. Conducted system audits and vulnerability assessments, executed server migrations and OS upgrades with controlled downtime risk, and automated monitoring/administrative workflows to reduce manual effort.