Fullstack Software Engineer - React, Kotlin & Ruby on Rails (x/f/m)

United States Digital Space LLC; United States; Hybrid; USD 81,000 - 127,000; Full time

Benefits offered by this job

Deutschlandticket (Germany-wide public

Vacation days: 28 + 1 per year (max 30

Relocation support

Health insurance benefits

Long-term equity program (DoctoGrowth)

Mental health resources

Job summary

ACAI (Advanced Calendar Improvement) is seeking a full-time Software Engineer to build features that centralise work, improve coordination, and automate administrative tasks in healthcare practice operations. You will work across Ruby/Kotlin backends and React/TypeScript frontends to deliver high-quality, user-facing experiences.

You will join a team that values privacy-by-default, robust systems, and collaboration with Product, Design, and Data Protection to deliver impactful solutions in a

Qualifications

• 3+ years of experience as a full-stack Software Engineer, with customer-facing product work.
• Experience building scalable, robust, and reliable systems.
• Comfort with handling PHI/PII and applying privacy by design.

Responsibilities

• Develop features for Task Manager, Patient Flow Management, and telesecretary workflows.
• Coordinate patient journeys from arrival to checkout, including waiting room status and care steps.
• Design solutions to reduce time spent creating, sorting, relaunching tasks.
• Work across backend and frontend technologies to deliver user-facing features.
• Build reliable, observable services to support a growing healthcare user base.

Skills

Full-stack software engineering

Scalable systems

Privacy & security by default

English fluency

AI tooling integration

Tools

Ruby

Kotlin

React

TypeScript

Rails

Java

Python

Swift

Job description

Join ACAI (Advanced Calendar Improvement), a team dedicated to making day-to-day practice operations more efficient and less mentally exhausting for healthcare professionals and their teams.

Practice operations are often fragmented across post-its, emails, SMS, phone calls, oral instructions, and individual memory. This makes it difficult for teams to know what needs to be done, who owns it, how urgent it is, and what has already happened.

As a Software Engineer, you will help build products that centralise work, improve coordination, and automate administrative tasks across the practice; directly contributing to a smoother experience for healthcare professionals, staff, and patients.

Your responsibilities

• Develop reliable, intuitive features for Task Manager, Patient Flow Management, patient intake, appointment proposals, and telesecretaryship workflows
• Help practices coordinate the patient journey from arrival to completion of a visit, including waiting-room status, care steps, walk-ins, delays, patient movement, and check-out
• Design solutions that reduce the time healthcare professionals and staff spend manually creating, sorting, remembering, relaunching, and completing tasks
• Work across backend and frontend technologies to deliver high-quality, user-facing experiences
• Build performant, reliable, and observable services that can support the company's growing user base and complex healthcare workflows
• Apply strong privacy, data protection, and security practices when working with personal and health-related information
• Partner closely with Product, Design, Data Protection, and other engineering teams to understand problems and deliver valuable solutions

About our tech environment

Our solutions run on a single, fully cloud-native platform serving web and mobile applications across multiple languages and countries, each with its own regulatory and specialty-specific requirements.

To address these challenges, we are modularising our platform through reusable components and a distributed architecture.

On ACAI, you'll primarily work with Ruby and Kotlin on the backend and React with TypeScript and Rails on the frontend. the company's broader technology environment also includes Java, Python and Swift.

We leverage AI in an ethical manner across our products to empower patients and healthcare professionals. Discover our AI vision.

Who you are

Before you read on, if you do not have the exact profile described below but feel this role matches your skills, we still encourage you to apply.

• You have 3+ years of experience as a full-stack Software Engineer, ideally working on user-facing products
• You have experience building scalable, robust, and reliable systems
• You are comfortable working with sensitive personal or health-related data, such as PHI and PII, and apply a strong privacy, data protection and security best practices by default
• You have experience collaborating closely with Product, Design, Security, and other engineering teams
• You have a user-first mindset and care about solving real problems for customers
• You use AI tooling thoughtfully as part of your engineering workflow
• You enjoy sharing knowledge, contributing to team discussions, and helping others grow
• You demonstrate a growth mindset and a strong learning agility
• You are fluent in English and comfortable working in a collaborative, discussion-oriented environment

Experience in healthcare, medical software, fintech, or another highly regulated domain would be a plus.

What we offer

• A Deutschlandticket (Germany-wide public transport pass) fully paid for by the company
• 28 vacation days + 1 additional day for each full calendar year of employment (up to a maximum of 30 days)
• Work from abroad for up to 10 days per year thanks to our flexibility days policy
• Company health insurance with great supplementary benefits through our partner Allianz
• Company pension scheme (bAV) through Allianz with an employer subsidy of 40% (15% within the probationary period)
• The the company Parent Care program, which includes one month additional parental leave and much more
• Enrollment in the company's long-term employee value sharing plan called DoctoGrowth
• Free mental health and coaching services through our partner Moka.care
• Subsidized sports membership through our partner Urban Sports Club
• A flexible workplace policy offering both hybrid and office-based mode
• Alongside healthy snacks and our regular breakfast buffet, we provide a subsidized meal benefit
• For caregivers and workers with disabilities, a package including an adaptation of the remote policy, extra days off for medical reasons, and psychological support
• Relocation support in case of international mobility
• Access to the best AI tools for coding, development and dedicated training

The interview process

• Coding Game
• Recruiter Interview
• Feature Building Interview
• System Design Interview
• Behavioral Interview
• Reference check

Job details

• Permanent position
• Full time
• Location: Berlin
• Working mode: Hybrid, with regular time in the Berlin office
• Start date: As soon as possible

We welcome everyone

At the company, we are committed to improving access to healthcare for everyone. This translates into our recruitment process. We evaluate candidates based solely on qualifications and motivation, without any form of discrimination.

The more diverse ideas are heard, the more our product will truly improve healthcare for all. You are welcome to apply to the company, regardless of your gender, religion, age, sexual orientation, ethnicity, or disability.

To ensure equal opportunities, we invite you to exclude personal information (e.g., pictures, age) from your applications. If you require any accommodation, please let us know for support during the hiring process.

Join us in building the healthcare we all dream of!

Your data privacy

*All information provided is processed by the company for application management. For data processing details, click here:* *Germany* *|* *France* *|* *Italy* *|* *Netherlands**.*

*Please contact hr.dataprivacy(at)the company.com for inquiries or to exercise your rights.*