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Stockholm · Independent Tech Sweden AB

Jon Stjärnström

Senior Frontend/Fullstack Developer — React, Next.js, TypeScript, Node.js

10+ years building high-traffic consumer products, from Sweden's largest real-estate platform to national streaming services.

Get in touchSee experience

About

How he works

10+ years building and maintaining high-traffic web applications, with a primary focus on frontend using React, Next.js, and TypeScript — and full comfort working full-stack, from Node.js backends to auth flows, CMS integrations, and personalization.

Strong focus on performance, SEO, accessibility, and long-term code quality. Works closely with designers and product teams, in both small cross-functional teams and larger product organizations.

Actively uses AI-assisted development workflows — including Claude Code — as part of how he builds today.

Experience

Selected roles

  1. Utbildningsradion (UR)

    Jun 2025 – Jun 2026

    Senior Developer

    Continued development of streaming service urplay.se and UR's in-house CMS, "Edith."

    • Built guided onboarding flows for the platform.
    • Built a new teacher login using Next-Auth, Keycloak, and Zod.
    • Delivered personalized content via a recommendations API (EBU's "Peach").
    • Maintained a strong WCAG accessibility focus throughout.
    • Used Claude Code throughout for codegen, documentation, and debugging.
    Next.jsTypeScriptReactNode.jsNext-AuthKeycloakZodPlaywrightPrismaJestReact QueryClaude Code

  2. Hemnet

    Sep 2021 – Jun 2025

    Senior Developer

    Frontend development on hemnet.se, Sweden's largest real-estate platform.

    • Contributed to the migration from Rails to Next.js/TypeScript.
    • Owned the news articles/advertorials platform and its CMS.
    • Built and maintained a component library and design system in Storybook, with a WCAG focus.
    Next.jsReactTypeScriptGraphQLApollo ClientPlaywrightJestSCSSRuby on RailsContentfulStorybook

  3. KTH Royal Institute of Technology

    Aug 2018 – Sep 2021

    Developer

    Maintained kth.se and internal tools.

    • Built and maintained the university's design system.
    • Migrated the site from Inferno.js to React.
    ReactInferno.js

Skills

Grouped by area

Frontend
ReactNext.jsTypeScriptJavaScriptReact QueryApollo ClientSCSS/CSSDesign Systems
Backend
Node.js/ExpressGraphQLPrismaRuby on Rails
Auth/Identity
Next-AuthKeycloak
Testing
PlaywrightJest
CMS/Platforms
ContentfulWordPress
Practice
SEO & PerformanceAccessibility (WCAG)AI-assisted development

Contact

Get in touch

Currently open to new consulting engagements.

jon.stjarnstrom@independtech.se

Independent Tech Sweden AB · Stockholm

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