01
Java
Required
TRCI-26-04889
Senior Backend Engineer (Java/Kotlin)
Senior backend engineer needed on contract in Wroclaw to design and build scalable microservices using Java and/or Kotlin with Spring Boot. The role focuses on DDD-based architecture, REST/gRPC APIs, event-driven messaging (Kafka/RabbitMQ), PostgreSQL data modeling, and cloud-native delivery using Docker/Kubernetes and CI/CD with Git. Cloud experience is required (Azure preferred; AWS/GCP acceptable) along with strong security fundamentals (OAuth2/SAML/Spring Security) and the ability to collaborate in English while owning quality, stability, and maintainability.
Position summary
- Location
- Poland
- Workplace
- On-site
- Employment
- Contract
- Experience
- Minimum 8 years and Maximum 10 years
Role overview
Why This Role Matters.
Senior backend engineer needed on contract in Wroclaw to design and build scalable microservices using Java and/or Kotlin with Spring Boot. The role focuses on DDD-based architecture, REST/gRPC APIs, event-driven messaging (Kafka/RabbitMQ), PostgreSQL data modeling, and cloud-native delivery using Docker/Kubernetes and CI/CD with Git. Cloud experience is required (Azure preferred; AWS/GCP acceptable) along with strong security fundamentals (OAuth2/SAML/Spring Security) and the ability to collaborate in English while owning quality, stability, and maintainability.
Your Impact
Deliver Enterprise Value
Help organisations solve complex business problems through modern technology, consulting expertise and measurable outcomes.
Collaboration
Work Across Teams
Collaborate with consultants, architects, engineers and client stakeholders throughout the project lifecycle.
Growth
Learn Continuously
Gain exposure to enterprise technologies, certifications, mentoring and real-world project experience.
Career Path
Grow With Ubique
Build a long-term consulting career with opportunities to take on greater responsibility and leadership over time.
Responsibilities
What You'll Be Doing.
Every role at Ubique contributes directly to solving meaningful business challenges for our clients.
Technology stack
Tools & Technologies.
The platforms and technologies you'll use to build modern, enterprise-grade solutions.
02
Kotlin
Required
03
Spring Boot
Required
04
Spring
Required
05
Microservices
Required
06
DDD
Required
07
Domain-Driven Design
Required
08
REST
Required
09
gRPC
Required
10
Kafka
Required
11
RabbitMQ
Required
12
Event-driven architecture
Required
13
PostgreSQL
Required
14
SQL
Required
15
Docker
Required
16
Kubernetes
Required
17
CI/CD
Required
18
Git
Required
19
Azure
Required
20
AWS
Required
Requirements
Skills & Experience.
We value curiosity, collaboration and continuous learning. If you don't meet every requirement but believe you can make an impact, we'd still love to hear from you.
Essential
Required Qualifications
Backend development with Java and/or Kotlin
Microservices architecture
Spring Boot (and Spring ecosystem)
Domain-Driven Design (DDD) principles
API development (REST)
API development (gRPC)
Event-driven architecture
Messaging platforms: Kafka or RabbitMQ
Relational databases and data modeling (PostgreSQL)
Containerization with Docker
Orchestration with Kubernetes (or similar)
CI/CD pipelines
Git version control
Cloud platforms: Azure or AWS or GCP
Security best practices; authentication/authorization with OAuth2 and/or SAML and Spring Security
Professional English communication
Preferred
Nice to Have
Azure (preferred cloud)
Modern architectural patterns for resilience and scalability
Design reviews and code review leadership/participation
What you'll gain
More Than Just A Job.
We're committed to helping every team member grow professionally, personally and technically while working on meaningful projects.
Global Exposure
Collaborate with international clients and multicultural teams on enterprise programmes.
Continuous Learning
Expand your expertise through mentoring, certifications and hands-on project experience.
Career Growth
Take ownership, develop leadership skills and grow your consulting career over time.
Flexible Working
Hybrid and remote collaboration designed around trust and delivering exceptional outcomes.
People First
Join a supportive culture where collaboration, respect and long-term relationships come first.
Enterprise Projects
Work on meaningful technology initiatives for leading organisations across industries.
Apply
Apply for Senior Backend Engineer (Java/Kotlin)
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