Johannes Justesen
@johannesjustesen
I build fast, production-ready React and Next.js applications from architecture to responsive user experiences.
NorwayWhat I'm looking for
I build production web applications in Next.js, React.js, JavaScript, and TypeScript, taking products from an empty repository to fast, responsive releases.
At Auramind.ai, I was the sole frontend engineer for a year and a half, creating the architecture, component library, coding standards, AI Playground, streaming model-response interface, and interaction analytics views.
I've also built web and mobile applications at Evoy, designed frontend architectures at Rhevolut, led design-system work at Caffeex Tecnologia, and improved client-facing applications for BTG Pactual and Sponte.
Experience
Work history, roles, and key accomplishments
Senior Frontend Developer
Auramind.ai
Oct 2024 - Apr 2026 (1 year 6 months)
Sole frontend engineer for a corporate generative-AI platform, building architecture, component library, and real-time streaming layer for model responses.
Frontend Developer
Rhevolut
Jun 2023 - Oct 2024 (1 year 4 months)
Built frontend architecture and codebase in Next.js and TypeScript, optimizing performance and scalability as the user base grew.
Frontend Developer
Caffeex Tecnologia
Apr 2022 - Jun 2023 (1 year 2 months)
Led frontend development, owning code quality and architecture, built design system components, integrated WebSockets, and moved data fetching to React Query.
Frontend Developer (Mid-level)
BTG Pactual
Sep 2021 - Mar 2022 (6 months)
Built version 2.0 of the client-facing application, improving performance by refactoring the codebase and reworking the UI in HTML and CSS.
Frontend Developer
Codengage
Aug 2020 - Sep 2021 (1 year 1 month)
Built design system components and features in React, owned bug tracking and testing for a system used by thousands of schools.
Web Developer
Freelance
Jul 2019 - Jul 2020 (1 year)
Built responsive landing pages, interactive e-commerce features, and custom components in HTML5, CSS3, and JavaScript.
Education
Degrees, certifications, and relevant coursework
Universidade Tecnológica Federal do Paraná (UTFPR)
BSc, Software Engineering
2018 - 2022
Activities and societies: Winner, 1st UTFPR/DV Programming Marathon.
Pursued a Bachelor of Science in Software Engineering, graduating in 2022. Won the 1st UTFPR/DV Programming Marathon.
Tech stack
Software and tools used professionally
Availability
Location
NorwayAuthorized to work in
Salary expectations
Social media
Job categories
Skills
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