Senior Staff Software Engineer

About the Position

We are seeking a Senior Staff Software Engineer to join our Engineering team in Kraków, Poland. This role is full-time and offers a hybrid work model.

About Kontakt.io

Inside health systems, where every second can matter, operations are still spread across dozens of disconnected tools and platforms. Kontakt.io is changing that. We combine proprietary hardware, AI-powered intelligence, and deep integrations with the technology health systems already have in place to build real-time understanding of what's happening across their operations. That intelligence becomes the execution layer care teams have been missing, helping them make smarter decisions and deliver better patient care.

Responsibilities

• Data Ingress & Device Integration: Own the pipeline that brings external device data into the Kontakt.io platform. Build and maintain robust integrations with Cisco Spaces, Aruba, and similar third-party infrastructure.
• Data Egress & External Integrations: Build and evolve the egress layer that streams enriched location and event data to partner systems and customer-facing APIs.
• Architecture & Technical Leadership: Drive the architectural evolution and establish engineering standards.
• Cross-team Ownership: Work directly with product stakeholders to translate business requirements into engineering decisions.

Requirements

• 7+ years of backend software engineering experience with strong production Java experience (Spring Boot and ideally Kotlin)
• Deep, hands-on Apache Kafka knowledge: Streams, state stores, topology design, and operational behavior
• Experience building real-time, event-driven distributed systems in multi-tenant SaaS environments
• Solid database fluency: MongoDB, PostgreSQL, Redis
• Hands-on AWS experience: EKS, Kinesis, S3; comfortable reading and writing Terraform and Helm
• Track record of taking ownership of a messy, under-documented domain and making it better
• Ability to work directly with product and business stakeholders
• Clear written and verbal English; the team is international
• Based in or willing to relocate to Kraków, Poland

Nice to Have

• Experience with IoT or BLE telemetry systems
• Go or Python for tooling and automation
• Familiarity with AsyncAPI, Drools rules engine, or OAuth2/Keycloak
• Background in a high-growth Series B/C product company

We Offer

• Competitive salary reflecting staff-level seniority
• Equity in a Series C company with a clear growth trajectory
• Private healthcare, Multisport card, and standard benefits package
• Hybrid from Kraków office - at least 2 days in the office
• A real technical challenge - not a maintenance role on a stable codebase