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Mafiana Kelvin

@mafianakelvin

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Backend engineer and full-stack developer building high-performance, secure APIs.

Nigeria

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What I'm looking for

I’m looking to build and scale high-performance, secure APIs and distributed systems. I want to work on real-time data pipelines, observability, and compliance-focused engineering, in cross-functional teams that value performance, reliability, and continuous improvement.

I’m a results-driven Backend Engineer and Full Stack Developer with 4+ years of experience building and scaling production-grade systems for high-traffic enterprise environments. I focus on resilient APIs, performance optimization, and reliability, especially in distributed, event-driven architectures.

In my recent work, I’ve delivered measurable performance wins—cutting average API response time from 2.5s to 900ms using Redis caching, async processing, and query optimization. I also reduced PostgreSQL query execution time by 85% through targeted indexing and performance tuning.

I build modern data and workflow pipelines that move fast. I replaced a 30-minute batch sync with a real-time Kafka streaming pipeline, orchestrated large-scale ETL with 15+ Airflow DAGs, and helped cut deployment times from 45 minutes to 8 minutes through CI/CD improvements.

I care deeply about security and compliance, including PII masking and data anonymization aligned with GDPR, plus audit logging and strong API access controls (OAuth2, JWT, RBAC). I enjoy cross-functional, international collaboration and turning complex systems into observable, maintainable platforms.

Experience

Work history, roles, and key accomplishments

Current

Full Stack Developer

Current

YouBloom Connect

May 2026 - Present (2 months)

Built an Artist Dashboard Campaigns feature using React/TypeScript, delivering 15 reusable UI components across 17 Figma-aligned screens. Designed Laravel REST APIs for campaign management and developed CEO and Accounting dashboard features, resolving production issues across authentication, Stripe payments, and compliance workflows.

React TypeScript Vite Laravel REST APIs MySQL Stripe API Firebase Firebase Authentication Laravel Sanctum Authentication Authorization Data Modeling Dashboard Development Testing Production Support CI CD

Backend Engineer

Springer Capital

Mar 2024 - Feb 2026 (1 year 11 months)

Contributed to a distributed microservices platform handling 150K–200K daily API requests with 99.8% uptime. Improved API response times by 60% using Redis caching and async processing, reduced PostgreSQL query time by 85%, and implemented real-time Kafka synchronization with under-2-minute data latency.

Microservices Redis PostgreSQL Query Optimization Airflow Kafka Synchronization Flask RESTX HubSpot Integration OAUTH2 JWT RBAC Audit Logging Pytest CI CD

Backend Developer

Mafjosey Enterprises

Jul 2019 - Dec 2022 (3 years 5 months)

Designed and delivered 8+ backend systems supporting e-commerce, inventory, and CRM workflows. Migrated legacy Node.js workflows to FastAPI, built secure REST APIs with JWT and role-based access control, and implemented Celery background processing for high-volume transactions.