Senior Java Developer

Tooploox; Polska; On-site; PLN 240,000 - 320,000; Full time

Job summary

A cutting-edge technology firm in Poland is seeking a Senior Java Developer to build scalable Java applications. The successful candidate will focus on developing a data retrieval platform for a global e-commerce client. Proficiency in Java, Spring Framework, and REST/GraphQL APIs is essential. This role allows for remote work while offering a vibrant office atmosphere in Warsaw and Wrocław, combining collaboration with flexibility to shape the future of AI.

Benefits

Sport subscription

Private healthcare

Free coffee

International projects

No dress code

Free snacks

Modern office

Qualifications

• 5+ years of backend development experience in Java and Spring Framework.
• Proficient in RESTful API design; experience with GraphQL APIs.
• Skilled with message brokers and caching technologies.

Responsibilities

• Develop and maintain the server-side logic of applications using Java.
• Implement efficient and performant backend code for high-volume production applications.
• Monitor application health and ensure reliability in production environments.

Skills

Backend development experience in Java

Proficient in RESTful API design

Experience with GraphQL APIs

Message brokers (Kafka, RabbitMQ)

Caching (Redis, Memcached)

Authentication and authorization mechanisms (OAuth 2.0)

Containerization and orchestration tools (Docker, Kubernetes)

Performance troubleshooting and debugging

Code versioning tools (Git)

CI/CD tools and practices

English B2+

Tools

Docker

Kubernetes

GraphQL

ReactJS

Job description

Experience and skills you need to join us:

• 5+ years of backend development experience in Java and Spring Framework
• Proficient in RESTful API design, experience with GraphQL APIs
• Experience with message brokers (e.g., Kafka, RabbitMQ, ActiveMQ) and caching (e.g., Redis, Memcached)
• Proficient with authentication and authorization mechanisms, especially OAuth 2.0
• Experience with containerization and orchestration tools like Docker and Kubernetes
• Knowledgeable in performance troubleshooting, profiling, and debugging tools
• Capable of solving complex challenges related to latency, data consistency, and performance in distributed systems
• Understanding patterns of distributed systems design; resilience patterns such as circuit breakers, retries, and timeout
• Proficient with code versioning tools, such as Git
• Skilled in CI/CD tools and practices
• English: B2+ (Written and Oral)
• Experience working in a lean agile process
• Proactive approach in understand the customer’s business and refining business requirements into technical requirements

It would be great if you also have:

• Experience with API contract testing
• NoSQL (e.g., MongoDB, Cassandra)
• Prompt engineering and experience with integration of GenAI LLMs into productions (ideally) or pet projects at least (OpenAI, Azure OpenAI, Bard, Llama)
• Familiarity with federated Graph architectures
• Experience mentoring less experienced colleagues is a strong advantage
• Team leader experience is a strong advantage
• Hands‑on experience with Google Cloud Platform
• ReactJS experience

The ideal candidate would have:

• Strong communication skills with experience in direct customer interactions.
• Ability to engage with clients on technical issues, gather requirements, manage expectations and provide updates on project status
• Ability to learn quickly, adapt to new technologies, and perform tasks independently
• Passion for writing clean, efficient, and maintainable code (and encouraging others to do so)

Hi there!

We’re Tooploox, a Solvd Inc company.

We create AI-powered products and services that make a real difference. Our team of nearly 200 specialists—including a 40+ person R&D team with many PhDs—has pioneered AI solutions across industries from healthcare to e-commerce. We’ve published research in top-tier venues like NeurIPS and ICML, while delivering real-world applications that help our clients innovate and scale.

We are looking for a Senior Java Developer to join our team. The ideal candidate will have experience developing scalable Java applications.

About the project: We are developing a data retrieval and operations platform for a next-generation customer support system for a global e-commerce leader. The platform will provide a federated GraphQL interface that unifies access to multiple backend services, enabling low-latency, real-time data retrieval and transactional operations to support AI-driven workflows.

The role will focus on designing, building and optimizing the platform to ensure scalability, reliability and test automation. This is a multi-team, collaborative initiative that requires close coordination with other delivery teams, adherence to high engineering standards and a strong focus on integration and architectural alignment.

How we work:

At Tooploox, you have the flexibility to choose your working hours and location. While we value remote work, we also believe in building relationships and invite you to join us in our Warsaw and Wrocław offices. Enjoy a relaxed atmosphere and try some “home-made” pizza from our office pizza oven. We love having pets in the office, so feel free to bring yours along.

Join us and shape the future of AI while working the way you like!

Responsibilities

• Develop and maintain the server-side logic of our applications using Java
• Implement efficient and performant backend code for high-volume production applications
• Monitor application health, identify related risks, and ensure reliability in production environments
• Contribute to all phases of the development lifecycle, from concept to deployment
• Review and refactor code, establishing best practices for code hygiene and organization

Requirements

• Java, Spring Framework, GraphQL, REST API
• Redis, Kafka, Docker, Kubernetes, RabbitMQ, ActiveMQ, Memcached
• OAuth, NoSQL (MongoDB, Cassandra)
• LLM's, GCP, React

Benefits

• Sport subscription
• Training budget
• Private healthcare
• International projects
• Insurance
• English lessons
• Integration events
• Free coffee
• Gym
• Bike parking
• Playroom
• Shower
• Free snacks
• Free beverages
• In-house trainings
• Modern office
• Startup atmosphere
• No dress code