Senior Kotlin/Java Engineer

About Kontakt.io

Kontakt.io is building the platform that care operations run on.

We reduce waste, cut costs, and improve throughput in hospitals by automating and orchestrating clinical workflows. Using AI, real-time location data (RTLS), and deep EHR integration, our platform enables care teams to operate with real-time intelligence and financial discipline.

Trusted by leading U.S. health systems including HCA, Sutter Health, AdventHealth, Trinity Health, and the U.S. Department of Veterans Affairs — and backed by Goldman Sachs — we are scaling rapidly toward the next phase of durable, disciplined hypergrowth.

Success in this position requires a passion for building high-performing and reliable applications. You need to have an internal urge to come up with innovative ideas and look for the best tools to solve scalability problems.

Our tech stack : 

backend: Kotlin, Java 21+ ; Spring boot, spring-data, Kafka streams, MongoDB, PostgreSQL, Docker, Kubernetes, Python, AWS

We are looking for a person who is able to work independently with the ability to look at the problem from a product perspective, suggest proper solutions and then execute against them. 

You will be expected to:

• develop user-facing Kontakt.io Apps

• define data models and work with database systems like MongoDB and Postgres

• establish connectivity with third-party systems using modern integrations technologies like RESTful APIs, WSS Streams, Webhooks, Kafka streams

• build modular and reusable components and libraries

• contribute to key architectural decisions that directly impact the scalability of Kontakt.io Apps.

• write and maintain documentation

• write performance tests

• support and maintain CI/CD Workflows 

• create and drive best practices in the team (including peer reviews and building for testability)

• propose any upgrades and updates necessary for keeping up with modern security and development best practices

• participate in 24/7 on-call rotation

Our requirements:

• 6+ years of software engineering experience

• hands-on experience in designing and developing highly scalable applications using modern technology stacks such as Java/Kotlin,

• strong Kafka experience

• strong microservice architecture experience

• knowledge of Spring frameworks

• the ability to naturally follow good development practices like test automation, CI/CD, source version control, etc

• experience with development for and deployment to AWS

• good communication skills (English is a must)

• Big Data experience is a great asset

We Offer:

• fast-paced and dynamic startup environment, flat structure

• competitive salary and stock option plan

• work with our IoT experts and trending technologies

• Hybrid work (Krakow office) — 2-3 days per week on-site

• collaborative and self-organized environment

• flexible working hours

• private medical care, cafeteria system

Ready to Build the Future of Healthcare?