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Ene Saar

@enesaar

Senior Full-Stack Engineer at MarsBased who delivered BCG energy-planning features and improved interactive data views.

At MarsBased, I developed planning and analytics features for a BCG energy-planning application, including scenario planning, scheduling, cost analysis, and resource-flow visualization. I optimized large data views to keep interactive planning screens responsive.

At ChartMogul, I worked on Subscription Analytics and CRM features, improving subscription-data processing and reducing latency on critical workflows by around 35% through database tuning and backend changes.

At Toggl, I worked on Toggl Track API modernization and built webhook-based integrations that reduced unnecessary API traffic by around 30%. Earlier, at Ericsson, I built Java and Spring Boot backend services and REST APIs for production applications.

Experience

Work history, roles, and key accomplishments

Senior Full-Stack Engineer

MarsBased

Mar 2025 - Jul 2026 (1 year 4 months)

Led frontend development on data-heavy client applications using React, TypeScript, and modern web tooling. Developed planning and analytics features for a BCG energy-planning application and optimized large data views for performance.

React TypeScript Remix ECharts React Flow TanStack Table API Integration Performance Optimization Code Review Mentorship

Senior Full-Stack Engineer

ChartMogul

Jun 2023 - Feb 2025 (1 year 8 months)

Led full-stack work on Subscription Analytics and CRM features using React, TypeScript, backend services, and PostgreSQL. Improved subscription-data processing, reducing latency on critical workflows by around 35%.

React TypeScript PostgreSQL Backend Services Database Tuning Performance Optimization Code Review API Design

Full-Stack Engineer

Toggl

Mar 2020 - May 2023 (3 years 2 months)

Worked on Toggl Track API modernization, building features across React, TypeScript, REST APIs, PostgreSQL, and Redis. Built Webhook-based integrations that reduced unnecessary API traffic by around 30%.

React TypeScript REST APIs PostgreSQL Redis Webhooks API Performance CI CD Testing

Software Engineer

Ericsson

Nov 2018 - Feb 2020 (1 year 3 months)

Built backend services and REST APIs using Java and Spring Boot for production applications. Developed frontend features with JavaScript, HTML, and CSS while taking on more end-to-end work.