Know ATS Score
CV/Résumé Score
  • Expertini Resume Scoring: Our Semantic Matching Algorithm evaluates your CV/Résumé before you apply for this job role: Senior Backend Engineer (Quarkus& GRPC& GraphQL).
Poland Jobs Expertini

Urgent! Senior Backend Engineer (Quarkus& GRPC& GraphQL) Job Opening In Warsaw – Now Hiring Recrucial

Senior Backend Engineer (Quarkus& GRPC& GraphQL)



Job description

Senior Backend Engineer (Java/Quarkus)


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Rebuild a new AI-integrated backend platform from scratch to replace outdated monoliths.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



  • Remote-first, async-friendly team

  • B2B contract with stable long-term workload

  • Architecture ownership & technical leadership

  • Fast decision cycles, zero corporate fluff

  • Integration with cutting-edge AI tools and agents

  • A real opportunity to rewrite the core of an industry platform

     


 Hiring Process




  1. Intro Call (30–45 min) – meet the architect, discuss the scope




  2. Technical Interview (60–90 min) – dive into APIs, microservices, and system design




  3. Offer – usually within a few days if we’re aligned



.

Skillset Required: Clo, Cro, Real Estate, Devops, Modula, Spring, Distributed Systems, Erp, Ned, Due Diligence, Java, Scala, Rest Apis, Agility, .net, Flexible, Leadership, Proptech, Hiring, Rpc, Rest Api Design, Rest Api, Fintech, Legaltech, Sql, Digital Transformation, Apache, Oracle, Docker, Saas


Required Skill Profession

Computer Occupations



Your Complete Job Search Toolkit

✨ Smart • Intelligent • Private • Secure

Start Using Our Tools

Join thousands of professionals who've advanced their careers with our platform

Rate or Report This Job
If you feel this job is inaccurate or spam kindly report to us using below form.
Please Note: This is NOT a job application form.


    Unlock Your Senior Backend Potential: Insight & Career Growth Guide