Maksim Polonsky
@maksimpolonsky
Senior Frontend Engineer building scalable React/TypeScript products with design systems and GraphQL expertise.
What I'm looking for
I’m a Senior Frontend Engineer with 9+ years building scalable React/TypeScript applications across B2B SaaS platforms. I’m async-first and thrive in fully remote environments, bringing a strong record of performance optimization and security hardening.
At InspereX (BondNav), I led a React 18-to-19 upgrade across the codebase, cutting CI/CD build times from 1,600s to under 1,000s. I eliminated 100% of npm security vulnerabilities (90 to 0) across the flagship app and 4 internal repos, and established Storybook as our design system and component library standard to enforce UI consistency and speed delivery.
I also architected Goldman Sachs order flow integration end-to-end, increasing platform transactions by 25%, and built an Analytics dashboard with Chart.js and 6+ interactive visualizations. Earlier, I scaled an MVP at InspereX to 2,000+ investors and tripled test coverage from 20% to 60% using Jest, React Testing Library, and SonarQube—while contributing to open source via MUI (Top 100 Contributor) and mentoring students through Springboard.
Experience
Work history, roles, and key accomplishments
Senior Frontend Engineer
InspereX
Mar 2021 - Present (5 years 1 month)
Led the React 18→19 upgrade, reducing CI/CD build times from 1,600s to under 1,000s and enabling concurrent rendering across a real-time B2B SaaS platform. Eliminated npm security vulnerabilities from 90 to 0, established Storybook as the design-system standard, architected Goldman Sachs order flow (+25% transactions), and built a Chart.js analytics dashboard with 6+ interactive visualizations.
Mentored 10+ software engineering students through full-stack coursework and interview prep, with 75% securing their first engineering role within 6 months.
Frontend Engineer
InspereX
Feb 2017 - Mar 2021 (4 years 1 month)
Built frontend testing infrastructure with Jest, React Testing Library, and SonarQube, tripling test coverage from 20% to 60% within a year. Contributed to platform scaling through component-level improvements and maintainable frontend patterns.
Frontend Engineer
InspereX
Feb 2017 - Mar 2021 (4 years 1 month)
Joined as the 5th engineer and drove MVP development from inception, scaling the platform to 2,000+ retail and institutional investors and supporting a pivotal merger with Incapital. Led the Search team’s flexible asset-type framework, delivering 400% growth in new user onboarding and 300,000+ additional bonds available to transact.
Frontend Engineer
Grid Net
Apr 2016 - Feb 2017 (10 months)
Built key product features using React and Backbone.js and co-led a 10% frontend codebase migration to React to improve scalability and maintainability. Integrated embedded devices to enable real-time visualization of electrical usage data for enterprise utility clients.
Education
Degrees, certifications, and relevant coursework
Galvanize Inc.
Immersion Certification, Software Engineering
2015 -
Completed a Software Engineering Immersion Certification program at Galvanize Inc. in 2015.
UC Santa Barbara
Bachelor of Arts, Environmental Studies
Earned a B.A. in Environmental Studies from UC Santa Barbara, with a History minor.
Tech stack
Software and tools used professionally
Availability
Location
Authorized to work in
Portfolio
github.com/maksimgmJob categories
Skills
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