John Tasie

Collaborative Frontend Engineer with over 4 years of experience architecting scalable web applications and real-time user interfaces. Expert at bridging technical complexity with intuitive design, delivering production-ready solutions that drive user engagement and business growth across diverse industries.

Frontend Engineer at UPWORK (2024-02 – Present)

Architected scalable web applications and real-time user interfaces for global clients

• Architected scalable web apps for global clients with Next.js, TypeScript, Payload, and Sanity, delivering type-safe, content-flexible solutions.
• Partnered with Turing engineers to build an AI-powered chart system, engineering a visualization layer with Recharts and Chart.js that processed real-time datasets including Choropleth maps, Polar charts, Ridge plots, and Word Clouds, ultimately improving model accuracy by 30%
• Designed relational database schemas in PostgreSQL via Supabase, optimizing data-fetching patterns and reducing query latency by 15%.
• Maintained a high Code Review standard, providing constructive feedback to team members to ensure codebase consistency and shared technical ownership.

Frontend Developer at ROCKET 21 (2024-11 – 2025-10)

Built pixel-perfect trading interfaces and optimized frontend performance for real-time market data

• Collaborated with designers to transform complex Figma prototypes into pixel-perfect trading interfaces, bridging the gap with backend engineers to ensure real-time market APIs reflected accurately within the UI for sub-second data precision.
• Optimized frontend performance by implementing memoization and efficient state-management using redux, reducing unnecessary re-renders in data-heavy views by 40%.
• Participated in testing, bug fixing, and iterative improvements, helping improve frontend stability and reduce user-facing issues over time.
• Thrived in an Agile environment, participating in rigorous code reviews and iterative feedback loops that reduced production bug reports by 25%.

React Developer at SPLITCASH (2023-05 – 2024-09)

Managed end-to-end payment flows and optimized GraphQL data layers for financial platform

• Managed end-to-end payment flows using React and Stripe, implementing robust validation and webhook handling to ensure zero-failure transactions within a high-stakes financial environment.
• Developed high-performance GraphQL data layers, optimizing state management and eliminating data over-fetching, which improved mobile load times across the platform.
• Modernized legacy codebases by refactoring class components to ES6 functional components, mentoring interns on modern React patterns and best practices.

Mid-level Frontend Developer at MAK ARTISTRY (2022-01 – 2023-05)

Built e-commerce interfaces with React and integrated CMS solutions

• Collaborated with a distributed team to build e-commerce interfaces with React, integrating Strapi and Storyblok CMS for product content management and checkout flows.
• Implemented reusable UI components and integrated RESTful APIs to display product data, pricing, and availability within the frontend.
• Worked with a distributed engineering team, using Git for version control and Docker to support consistent development.

Junior Web Developer at TRADING VIEW (2021-06 – 2021-12)

Contributed to frontend components and tested API integrations under senior developer guidance

• Worked under the guidance of senior developers while contributing to frontend components and testing.
• Supported the integration of RESTful APIs into front-end views, helping display market data accurately.
• Gained hands-on experience with frontend development workflows, including version control and code reviews.

B.Sc. in Geology – University of Lagos (2015-01 – 2021-01)