Kristofer Kuusik

Built React/Next.js and Vue.js dashboards for internal SaaS tools with real-time GraphQL subscriptions, used across multiple product teams. Developed GraphQL APIs (Hasura + Apollo) and REST APIs integrated with PostgreSQL, serving millions of requests monthly with <150ms latency. Optimized PostgreSQL queries and indexes, reducing query response times by 35%. Designed Dockerized microservices with CI/CD pipelines (GitHub Actions, Kubernetes), cutting release time from hours to 15 minutes. Migrated legacy Angular modules into React-based frontends, modernizing user experience and reducing bundle size by 25%. Integrated monitoring with Datadog and ElasticSearch, improving system reliability and issue resolution time. Automated testing with Jest, Cypress, PyTest (85%+ coverage), reducing regressions in production by 40%. Partnered in system-level design reviews balancing scalability, maintainability, and speed of delivery.

Developed SaaS analytics features using Vue.js, Angular, Node.js, Python/Django, and PostgreSQL. Migrated services from REST to GraphQL APIs, reducing payload size by 40% and enabling flexible queries. Refactored monolithic Node.js/ASP.NET services into modular microservices, increasing resilience and simplifying deployments. Built backend integrations with RabbitMQ and Redis, ensuring real-time event-driven data processing. Automated deployments with Docker + GitLab CI/CD, enabling weekly production releases. Created reusable UI libraries in Vue.js and Angular with Storybook, ensuring consistency across apps. Applied SonarQube quality gates, improving maintainability and reducing bug counts. Prototyped climate-risk dashboards combining Django APIs with data visualizations (ECharts, AG Grid).

Delivered web applications using React, Angular, ASP.NET Core, Python/Django, and PostgreSQL, serving thousands of daily users. Implemented GraphQL resolvers in Django/Node.js, improving developer productivity and reducing API boilerplate. Built Next.js SPAs with optimized async data fetching for smoother user experiences. Designed SQL Server and PostgreSQL queries, triggers, and migrations to support scalable backends. Deployed microservices on AWS ECS and Azure App Services, increasing reliability. Implemented unit and integration testing with JUnit, NUnit, PyTest, and Jest, reaching 80%+ coverage. Migrated monolithic ASP.NET MVC applications into modular ASP.NET Core microservices, improving maintainability. Contributed to Agile workflows with Scrum, pair programming, and peer code reviews.