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Backend engineer with 4+ years building production systems across distributed architecture, data pipelines, CRM integrations, and API platforms. Strong focus on backend systems, API design, and distributed data, with comfortable full-stack delivery. Currently building toward AI agent and observability engineering, leveraging experience across microservices, Kafka streaming, ETL workflows, security (OAuth2/JWT/RBAC), and enterprise integrations with multiple CRMs.…Backend engineer with 4+ years building production systems across distributed architecture, data pipelines, CRM integrations, and API platforms. Strong focus on backend systems, API design, and distributed data, with comfortable full-stack delivery. Currently building toward AI agent and observability engineering, leveraging experience across microservices, Kafka streaming, ETL workflows, security (OAuth2/JWT/RBAC), and enterprise integrations with multiple CRMs.

Kelvin Chiwinke Mafiana

Back-End Developer, Full Stack Developer, Web Developer, +2

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Backend engineer with 4+ years building production systems across distributed architecture, data pipelines, CRM integrations, and API platforms. Strong focus on backend systems, API design, and distributed data, with comfortable full-stack delivery. Currently building toward AI agent and observability engineering, leveraging experience across microservices, Kafka streaming, ETL workflows, security (OAuth2/JWT/RBAC), and enterprise integrations with multiple CRMs.…Backend engineer with 4+ years building production systems across distributed architecture, data pipelines, CRM integrations, and API platforms. Strong focus on backend systems, API design, and distributed data, with comfortable full-stack delivery. Currently building toward AI agent and observability engineering, leveraging experience across microservices, Kafka streaming, ETL workflows, security (OAuth2/JWT/RBAC), and enterprise integrations with multiple CRMs.

Available to hire

Backend engineer with 4+ years building production systems across distributed architecture, data pipelines, CRM integrations, and API platforms. Strong focus on backend systems, API design, and distributed data, with comfortable full-stack delivery.

Currently building toward AI agent and observability engineering, leveraging experience across microservices, Kafka streaming, ETL workflows, security (OAuth2/JWT/RBAC), and enterprise integrations with multiple CRMs.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Beginner

Beginner

Beginner

Language

English

Advanced

Work Experience

Full Stack Developer at YouBloom Connect

January 1, 2026 - Present

Built an end-to-end Artist Dashboard Campaigns feature for Phase 1, including Laravel API design (controllers/endpoints/migrations), milestone-based automated prompt system across campaign lifecycle events, and CEO/Accounting dashboard UI/API features. Worked across Firebase Authentication, Laravel Sanctum token auth, and Stripe integration; fixed production bugs and rebuilt/redesigned landing and About pages to Figma specifications.

Backend Engineer at Springer Capital

January 1, 2024 - March 1, 2026

Worked on a distributed microservices platform handling 150K–200K daily requests with 99.8% uptime. Improved performance using Redis caching, async processing, and database optimization; reduced query time substantially. Built unified CRM data extraction using Airflow DAGs and event-driven Kafka streaming to reduce sync latency. Implemented cursor-based extraction, PII masking/anonymisation with audit logging, OAuth2/JWT/RBAC security, and comprehensive testing; accelerated CI/CD deployment and reduced infrastructure costs.

Backend Developer (Contract) at Mafjosey Enterprises

July 1, 2019 - December 1, 2022

Delivered backend systems for e-commerce, inventory, and CRM workflows. Migrated legacy Node.js script-based workflows to structured FastAPI services, built REST APIs with JWT auth and RBAC, and added Celery background processing for high-volume transactions. Applied Redis caching and query optimization to improve response times; supported CI/CD and participated in reviews and sprint planning.