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Hafiz Usman HussainHU

Hafiz Usman Hussain

Full-Stack Developer-Architect & Technical Leader

£350/day
Manchester, GB
8-15 years

Average response time: 1 hour

About Hafiz Usman

I help teams architect scalable systems and build AI-powered applications that drive growth.

As a full-stack developer-architect, I specialize in solving the problems that slow down scaling: systems that break under load, AI features that actually work, integrations that don't fail, and teams that execute with confidence.

I don't just write code—I architect systems that your team can maintain, evolve,
and scale. I lead from the ground up, combining hands-on development with strategic
thinking.

WHAT I BUILD

Intelligent Systems & AI Engineering:
• LLM integration and embeddings (OpenAI, custom models)
• RAG pipelines with vector databases (semantic search, custom knowledge bases)
• Agentic workflows (autonomous agents, multi-step automation)
• Production AI systems (monitoring, reliability, safety)

Scaling Web Applications:
• Database optimization and query performance tuning
• Caching strategies, async patterns, real-time features
• Zero-downtime deployment, infrastructure automation
• Systems architected for 10K+ concurrent users

API & Integration Architecture:
• RESTful and GraphQL API design
• Third-party system orchestration (HubSpot, Salesforce, Stripe, Shopify)
• Event-driven workflows, webhook automation
• Reliable data synchronization across systems

Technical Leadership:
• Architecting for teams, not just solo execution
• Mentoring engineers through complex decisions
• Building systems others can maintain and extend
• Translating business requirements into technical strategy


TECH STACK
Languages: JavaScript, TypeScript, Python, PHP, Go
Frontend: React, Next.js, HTML5, CSS, Figma, Tailwind
Backend: Node.js, NestJS, Express, FastAPI
Databases: PostgreSQL, MongoDB, Redis, Elasticsearch
Cloud & DevOps: AWS, Docker, Terraform, GitHub Actions, serverless
AI & Emerging: LLM APIs, RAG pipelines, vector databases, GraphQL,
microservices, agentic frameworks



Looking forward to connecting.
  • English

    Native or bilingual

Can work on-site
Manchester (up to 50km)

Experience

  • Seller Log
    Full Stack Developer
    E-COMMERCE
    October 2025 - January 2026 (3 months)
    Ipswich, United Kingdom
    As a Fullstack Developer at Seller Log, I bring expertise in both frontend and backend development to create complete solutions. Through my versatile skill set, I consistently deliver robust web applications that fulfill client needs and drive business growth.
    • Wrote modular scripts utilizing ES6 Modules (import/export) in JavaScript to create a clear architectural structure for large projects.
    • Configured monitoring, logging, and alerting for production API environments.
    • Managed complex asynchronous flows using TypeScript Promises and Async/Await with explicit return types for reliability.
    • Wrote unit tests for React components using React Testing Library to verify component behavior and user interaction accuracy.
    • Provided mentorship and knowledge sharing sessions to educate team members on best practices and advanced techniques in GraphQL development, fostering a culture of continuous learning and improvement within the company.
    • Created modular Node.js service layers and controllers for maintainable and testable backend architecture.
    • Provided technical support and troubleshooting for Git-related issues.
    • Monitored database health and memory usage using MongoDB Compass to identify and resolve bottleneck queries.
    • Leveraged GraphQL Federation to combine multiple subgraphs into a unified gateway, simplifying frontend integration for microservices.
    • Secured application traffic using AWS WAF and Azure Front Door, mitigating DDoS attacks and managing SSL/TLS certificates centrally.
    • Designed multi-repo pipelines to coordinate synchronized releases for interdependent microservices within a complex ecosystem.
    • Configured custom headers and security policies within next.config.js to protect the production environment from common web vulnerabilities.
    • Documented Entity-Relationship Diagrams (ERD) to provide a clear architectural map for development teams and stakeholders.
    Node.js React.js Next.js MongoDB NestJs
  • Beyond Competitions
    Full Stack Developer
    DIGITAL AND IT
    August 2024 - January 2025 (5 months)
    Manchester, United Kingdom
    In my capacity as a Fullstack Developer at Beyond Competition, I took part in developing end-to-end solutions, proficiently managing both frontend and backend development tasks. Leveraging my diverse skill set, I ensure the delivery of resilient web applications that meet client requirements and support business advancement.
    • Optimized API performance with query batching, caching, and async patterns.
    • Structured React projects using feature-based folders and lazy loading with Suspense to optimize initial bundle sizes.
    • Conducted Code Reviews, performance audits, and quality assurance testing to maintain code quality, security, and compliance standards for Shopify projects.
    • Collaborated closely with frontend developers, designers, and other stakeholders to understand project requirements and deliver solutions that meet business needs.
    • Implemented GraphQL subscriptions to enable real-time data updates and notifications, enhancing the responsiveness and interactivity of web applications.
    • Applied JavaScript Regular Expressions to perform complex string parsing and form validation for improved data integrity.
    • Refactored legacy codebases to TypeScript, resolving implicit any issues and establishing a strongly typed architecture.
    • Skilled in designing RESTful APIs and implementing real-time functionality with Web Sockets using node.js.
    • Automated cron jobs and scheduled tasks using Node.js for nightly batch operations and data synchronization.
    • Implemented automated rollback mechanisms for failed deployments in CI/CD pipelines.
    • Utilized Git for maintaining documentation and versioning of project artifacts.
    • Architected unsupervised learning clusters to identify anomalies and hidden patterns within massive multidimensional data streams.
    • Integrated Mongoose virtuals and populated references to efficiently manage relational data patterns within a NoSQL structure.
    Node.js React.js Express Next.js TailwindCSS
  • Big Photo Hunt
    Full Stack Developer
    DIGITAL AND IT
    December 2023 - September 2024 (9 months)
    Birmingham, United Kingdom
    As a Fullstack Developer at Big Photo Hunt, I excel in creating comprehensive solutions that encompass both frontend and backend development. Through my diverse skill set, I consistently deliver robust web applications that address client needs and contribute to business growth.
    • Integrated API gateways and microservices architecture for modular development.
    • Implemented real-time chat and notifications with WebSocket and Socket.io integration in Node.js.
    • Set up environment-specific configurations for seamless deployment using Docker Compose.
    • Configured role-based access control (RBAC) and encryption at rest to secure sensitive MongoDB document stores.
    • Implemented Rate Limiting and Throttling mechanisms to protect public APIs from overuse and Denial of Service attacks.
    • Configured CloudWatch and Azure Monitor dashboards to provide real-time observability and automated alerting for system health metrics.
    • Managed secret masking and secure variable injection within CI/CD Pipelines to protect API keys and database credentials.
    • Leveraged React Server Components to minimize client-side JavaScript bundles, resulting in faster hydration and improved interactivity.
    • Configured user permissions and access control to secure sensitive information and prevent unauthorized data modification.
    • Developed Gutenberg blocks using React to provide content editors with a modern and intuitive drag-and-drop editing experience.
    • Managed application state using JavaScript Closures and Local Storage to persist user preferences across browser sessions.
    • Leveraged TypeScript enums and literal types to define fixed sets of constants, improving code readability and IDE autocomplete.
    • Built accessible interfaces by following WAI-ARIA standards within React, ensuring screen reader compatibility for interactive elements.
    Node.js Microsoft Azure React.js NestJs MongoDB

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Education

  • U niversity of South Asia U niversity of South Asia
  • Bachelor's I n
    2014
    Bachelor's I n

Skill set

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