Senior Backend Engineer - Kotlin API Integrations (UK)

United States Digital Space LLC

United States

Remote

USD 78,120 - 122,760

Full time

14 days+

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Job summary

United States Digital Space LLC is seeking a Freelance Senior Backend Engineer for our UK Market squad. You’ll ensure seamless data flow between our products and partners’ software solutions, building integrations with healthcare platforms.

Location flexibility includes England, France, or Germany, with travel to the UK and Berlin and a commitment of at least 3 months. You’ll shape integrations, design scalable APIs, and own the end-to-end development process, delivering impactful solutions that

Qualifications

Must have several years of backend development experience and API integration.
Proficient in Kotlin and REST API design.
Business fluent in English (C1) to communicate with partners.
Willing to base in England, France or Germany or work remotely.
Able to travel to UK and Berlin; travel expenses covered.
Available to commit to at least 3+ months.

Responsibilities

Shape the future of our integrations – Develop interfaces that connect the company with care and medical systems.
Build future-proof solutions – Develop a scalable API and set industry standards with partners.
Take end-to-end ownership – From idea through implementation to ongoing integration development.
Architecture with foresight – Design data models and sustainable solutions for complex systems.
Work with impact – Your work saves caregivers time and improves documentation.