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Diana KostaDK
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Diana Kosta

@dianakosta

Frontend developer at AgencyAnalytics who built Client Tagging and cut data-refresh time on key views from ~1,200ms to ~450ms.

Canada
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At AgencyAnalytics, I built the UI for Client Tagging, taking it from tech design and API contracts through release and post-launch support. I also built the AskAI dialog UI with OpenAI API integration.

I reduced redundant API calls by ~40% and data-refresh time on key views from ~1,200ms to ~450ms with RTK Query caching and shared state patterns. I also improved production observability with Grafana dashboards for API traffic and errors.

At Ambient (formerly SST), I migrated legacy Material UI components to React/TypeScript, cutting initial load time from 3.4s to 2.3s and raising the Lighthouse performance score from 58 to 81. I also maintained a synchronized multi-camera media review tool using HLS video streaming.

Earlier, I delivered healthcare web applications at Matrix DNA and built Salesforce CRM features at Zerto, where I also migrated 10,000+ customer records with full data integrity. I bring a front-end focus across React and TypeScript applications, with experience in Node.js, PHP, and Salesforce development.

Experience

Work history, roles, and key accomplishments

MD

Full Stack Developer

Matrix DNA

Jan 2020 - Jan 2022 (2 years)

Delivered healthcare web applications with React frontends and Node.js services in a Docker-based microservice environment. Supported adoption by demoing systems to healthcare professionals.

Zerto logoZE

Front End React Developer

Jan 2018 - Jan 2020 (2 years)

Reduced legacy bugs by 40% by triaging by customer impact and fixing root causes. Shipped features with PMs, designers, and QA using Scrum.

Zerto logoZE

Salesforce Developer

Jan 2012 - Jan 2018 (6 years)

Built Salesforce CRM features in Apex and Visualforce for finance and sales teams, integrating with Amazon Cognito and Tableau. Migrated 10,000+ customer records with full data integrity.

Education

Degrees, certifications, and relevant coursework

TC

The Ruppin Academic Center

Bachelor of Science, Software and Hardware Engineering

Bachelor of Science in Software and Hardware Engineering, WES-assessed as equivalent to a four-year Canadian bachelor's degree.

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