Lead/Senior Java Developer

Experis; Kraków; Hybrid; PLN 420,000 - 540,000; Full time

Job summary

Experis in Kraków is seeking a senior Java developer to join an international team building cloud-native, high-performance applications. Hybrid work model: 3 days per week in the Kraków office, with global collaboration across time zones.

You will design, develop, and maintain large-scale systems, contribute to architectural decisions, and work with Spring Boot, microservices, Kafka, and real-time data platforms.

Qualifications

• 12+ years of professional experience in software development with Java.
• Experience with microservices and data streaming architectures.
• Strong knowledge of security technologies, including Azure AD and OAuth.
• Experience with AI-assisted software development practices.

Responsibilities

• Take over responsibilities and knowledge from the current vendor.
• Design, develop, and implement new application functionalities.
• Maintain, enhance, and optimize existing applications.
• Collaborate with business stakeholders and technology teams to deliver scalable solutions.
• Support the development of real-time, high-throughput data platforms.
• Leverage AI-assisted development tools to improve software delivery and productivity.

Skills

Microservices

Data streaming architectures

Azure AD & OAuth security

AI-assisted development

SDLC knowledge

Communication skills

Tools

Java

Spring Boot

Flowable

JPA / iBatis

Kafka

PostgreSQL

Cosmos DB

Redis

REST APIs

Azure Cloud

Docker

Kubernetes

Maven

Gradle

Job description

Location: Kraków, Poland
Work Model: Hybrid (3 days per week from the Kraków office)
Join an international team and play a key role in building and maintaining high-performance, cloud-native solutions. This position offers the opportunity to work on large-scale, business-critical applications, contributing to both strategic architecture decisions and hands-on development.

Key Responsibilities

• Take over responsibilities and knowledge from the current vendor.
• Design, develop, and implement new application functionalities.
• Maintain, enhance, and optimize existing applications.
• Collaborate with business stakeholders and technology teams to deliver scalable solutions.
• Support the development of real-time, high-throughput data platforms.
• Leverage AI-assisted development tools to improve software delivery and productivity.

Required Skills & Experience

• 12+ years of professional experience in software development with Java.
• Strong hands-on experience with:
  • Java
  • Spring Boot
  • Flowable
  • JPA / iBatis
  • Kafka
  • PostgreSQL
  • Cosmos DB
  • Redis
  • REST APIs
  • Azure Cloud
  • Docker
  • Kubernetes
  • Maven
  • Gradle
• Proven expertise in microservices and data streaming architectures.
• Strong knowledge of security technologies, including Azure AD and OAuth.
• Experience with AI-assisted software development practices.
• Deep understanding of Computer Science fundamentals and the Software Development Lifecycle (SDLC).
• Excellent communication skills with the ability to translate business requirements into technical solutions and collaborate across global teams.

Nice to Have

• Experience designing and delivering high-performance, high-throughput platforms.
• Expertise in real-time streaming systems and time-series data processing.
• Experience working in large-scale enterprise environments.

What We Offer

• Opportunity to work on innovative, large-scale international projects.
• Influence on architectural and technical decisions.
• Exposure to modern cloud-native technologies and data-driven solutions.
• Collaborative environment with highly skilled engineering teams.
• Long-term engagement with challenging and impactful work.