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Urgent! Senior Backend Engineer (Quarkus& GRPC& GraphQL) Job Opening In Warsaw – Now Hiring Recrucial
Remote | B2B Contract | Full-time
Who Are We?
We’re a product-first team driving a massive digital transformation within a large international organization that runs over 40 digital legaltech and proptech services.
Our mission?
Rebuild a new AI-integrated backend platform from scratch to replace outdated monoliths.
We’re redesigning everything, and you’ll be hands-on in shaping core systems for the next generation of property and legal infrastructure.
What Will You Work On?
As a Senior Java/Quarkus Engineer, your focus will be on designing, building, and integrating high-performance microservices into a modern cloud-native infrastructure with deep ties to AI agents and real-time automation.
Here’s what your day-to-day will look like:
Develop and Maintain Java/Quarkus Microservices
Build new microservices using Quarkus with GraphQL and gRPC support
Follow project architecture standards and clean code principles
Ensure code is scalable, testable, and well-documented
Integrate Services into Cloud Infrastructure
Deploy and operate services within Kubernetes/OpenShift clusters
Set up and support CI/CD pipelines (GitLab CI, Jenkins, etc.)
Collaborate with DevOps to automate deployments
Design Robust Database Integrations
Work with PostgreSQL, Oracle, MS SQL via a microservices layer
Implement connection pooling, transaction management, and fault-tolerant DB access
Enable AI Service Integrations and Durable Automation
Develop APIs for interaction with AI components and agents
Build automated assistants and AI-based developer tools
Work with Apache Arrow Flight (Flight Server & Client) for high-throughput data streaming
Implement durable mutation operations based on the framework
Refactor and Migrate Legacy Code
Analyze legacy .NET and Delphi logic
Rewrite and optimize old services in Java/Quarkus
Preserve business logic while modernizing implementation
Observability and Monitoring
Implement and maintain telemetry, tracing, and logging (e.g., OpenTelemetry)
Ensure visibility and reliability across all services
Tech Stack
Languages: Java (Senior level), SQL
Frameworks: Quarkus (GraphQL, gRPC, REST)
Infrastructure: Docker, Kubernetes, OpenShift
CI/CD: GitLab CI, Jenkins, Helm
Databases: PostgreSQL, Oracle, MS SQL
Auth: Keycloak (SSO, token-based auth)
Data Streaming: Apache Arrow / Arrow Flight
Automation/Orchestration: Temporal.io
Why This Role Is Senior
You’ll own key systems and are expected to:
Act independently and make architecture-aware decisions
Lead technical discussions and conduct code reviews
Handle complex migrations and legacy transformations
Be a go-to expert for microservice architecture, performance, and scalability
Mentor less experienced engineers
What You Bring
4–6+ years of backend development in Java
Production experience with Quarkus (or Spring and willingness to ramp up)
GraphQL + gRPC microservice design
Solid cloud experience: Kubernetes/OpenShift, Docker
CI/CD knowledge and database integration skills
Understanding of durable workflows (Temporal is a big plus!)
High sense of ownership, initiative, and autonomy
What We Offer
Hiring Process
Intro Call (30–45 min) – meet the architect, discuss the scope
Technical Interview (60–90 min) – dive into APIs, microservices, and system design
Offer – usually within a few days if we’re aligned
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Unlock Your Senior Backend Potential: Insight & Career Growth Guide
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Great news! Recrucial is currently hiring and seeking a Senior Backend Engineer (Quarkus& GRPC& GraphQL) to join their team. Feel free to download the job details.
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An organization's rules and standards set how people should be treated in the office and how different situations should be handled. The work culture at Recrucial adheres to the cultural norms as outlined by Expertini.
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