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Daria Hostieva

@dariahostieva

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Full Stack Developer at RT MIS who built and maintained healthcare system modules used by over 400,000 users.

Netherlands

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At RT MIS, I built and maintained Healthcare Information System modules used by over 400,000 users. I also optimized SQL queries across PostgreSQL and MS SQL Server, with improvements of up to 40%.

At Klientiks CRM, I developed CRM modules and integrations for appointment scheduling, portals, payments, and messaging. I started there as a Quality Assurance Engineer, creating test cases and testing web, iOS, and Android products.

Experience

Work history, roles, and key accomplishments

Full Stack Developer

RT MIS

Oct 2023 - Aug 2025 (1 year 10 months)

Built and maintained Healthcare Information System modules for 400,000+ users. Optimized SQL queries, led cross-system integration, and wrote test suites to reduce regressions.

PHP Laravel PostgreSQL MS SQL Server MongoDB Redis XHProf XDebug HAR Logs PHPUnit Postman GitLab CI CD Docker S3 Agile

Full Stack Developer

Klientiks CRM

Sep 2021 - Oct 2023 (2 years 1 month)

Developed and refactored modules for appointment scheduling, portals, dashboards, payments, and integrations. Optimized search and response times with Sphinx and Redis.

PHP JavaScript PostgreSQL Sphinx Redis IP Telephony WhatsApp WebSockets REST APIs SQL Optimization

Quality Assurance Engineer

Klientiks CRM

Sep 2020 - Sep 2021 (1 year)

Created test cases and performed manual and automated testing across web, iOS, and Android. Analyzed data inconsistencies using PostgreSQL and used AWS S3 for data synchronization.