Senior Kotlin Software Engineer @ Kontakt.io

Kontakt.io; Kielce; Hybrid; PLN 120,000 - 150,000; Full time

Job summary

A healthcare technology company in Kielce is seeking a Senior Kotlin Software Engineer to develop scalable applications and improve care delivery operations. The ideal candidate has over 6 years of software engineering experience, a strong background in Java or Kotlin, and excellent communication skills in English. The role offers a competitive salary, stock options, and a hybrid work model.

Benefits

Competitive salary

Stock option plan

Hybrid work

Private medical care

Sport subscription

Free coffee

Free parking

Flexible working hours

Qualifications

• 6+ years of software engineering experience.
• Experience in designing and developing scalable applications.
• Good communication skills in English.

Responsibilities

• Develop user-facing Kontakt.io Apps.
• Define data models and work with MongoDB and Postgres.
• Establish connectivity with third-party systems.
• Build modular and reusable components.
• Contribute to architectural decisions for scalability.
• Write and maintain documentation.

Skills

Java/Kotlin

Microservice architecture

Kafka

Spring frameworks

AWS

Testing

SQL

MongoDB

Angular

Kubernetes

Tools

Jira

GitHub

GIT

Jenkins

Agile

Scrum

Job description

Senior Kotlin Software Engineer @ Kontakt.io Kielce Kielce, Swietokrzyskie, Polska

Mission Statement

Kontakt.io is building the platform that care operations run on. We reduce waste, cut costs, and improve revenue by improving throughput, asset utilization and staff productivity. Our platform uses AI, RTLS, and EHR data to enable self-learning agents to automate workflows, adapt in real-time, and orchestrate all of care delivery operations. Easy to deploy and scale, it gives a clear picture of spaces, equipment, and people, eliminating inefficiencies and enhancing the patient experience. With measurable 10X ROI and over 20+ use cases, Kontakt.io is the go‑to platform for better and faster care delivery operations. 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.

Benefits

• 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) – 3 days per week on-site
• Collaborative and self-organized environment
• Flexible working hours
• Private medical care, cafeteria system
• Sport subscription
• Flat structure
• Small teams
• International projects
• Free coffee, bike parking, shower, free snacks, free beverages, free parking
• Startup atmosphere, no dress code

Ready to Build the Future of Healthcare?

Responsibilities

• 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 integration 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

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 microservice architecture experience
• Strong Kafka experience
• Knowledge of Spring frameworks
• 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
• Java, Kotlin, Kafka, Microservice architecture, Spring, CD, SQL, Testing, Architecture, Cloud, AWS, System Design, MongoDB, Angular, Big data, Kubernetes
• Tools: Jira, GitHub, GIT, Jenkins, Agile, Scrum

Additional benefits: Sport subscription, Private healthcare, Flat structure, Small teams, International projects, Stock options, Free coffee, Bike parking, Shower, Free snacks, Free beverages, Free parking, Startup atmosphere, No dress code.