Senior Backend/Product Engineer

Salary: 1200-1500 PLN/MD on B2B

Work model: Hybrid from Gdynia/Warszawa/Rzeszów/Kraków or 100% remote with occasional European workshops

 

Why choose this offer?

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• Work in an international environment – collaboration with distributed teams and stakeholders from multiple countries
• Real impact – direct improvement of how construction projects are managed worldwide
• Technical challenges – solving complex problems at the intersection of data, scale, and user needs
• Professional growth – continuous development of expertise in an environment that values learning

 

Project

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As a Senior Backend Engineer, you’ll use your technical expertise and product mindset to build scalable systems that address real challenges in the construction industry, ensuring that every technical decision enhances both user experience and product outcomes. You’ll work in a small cross-functional team, collaborating with product managers, designers, and engineers to deliver end-to-end solutions. While focusing on backend development, you’ll apply product sense to balance performance with scalability, designing and maintaining robust distributed systems. You will optimize for performance, time-to-market, and contribute to backend services that enable new AI-powered features for construction professionals.

 

What you'll be working on

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• Collaborating within the product team to understand user needs and turn them into scalable solutions
• Applying product thinking to grasp the “why” behind features and their impact
• Developing robust backend services that address real challenges in the construction industry
• Designing and delivering intuitive, well-documented, high-performance APIs for internal and external use
• Enhancing data layer performance across multiple database technologies (MongoDB, SQL, PostgreSQL)
• Working within the JVM ecosystem to build RESTful web services
• Promoting engineering best practices through reviews, testing, documentation, and architectural discussions
• Supporting technical planning with accurate estimates, risk assessment, and solution proposals

 

Skills & experience we're looking for

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• Proficiency in Java (currently version 11, migrating to 21) or other JVM languages with hands-on experience building production systems
• Practical experience with JVM frameworks such as Spring, Jersey, Ktor, and Dropwizard (with Jackson, and configuration)
• Product-minded approach
• Strong knowledge of SQL and MongoDB including optimization, indexing, query tuning, and data modeling
• Experience with build and dependency management tools such as Maven
• Solid computer science fundamentals including Big-O notation, data structures, and algorithms
• Experience with designing and implementing RESTful APIs that are performant and well-documented
• Familiarity with distributed systems and microservices architecture patterns
• Proficiency in testing strategies including unit, integration, and performance testing

 

Nice to have

• Expertise in other JVM languages: Kotlin, Scala, or Clojure
• Experience with AWS services like S3, EKS, and RDS
• Previous experience in startups/scaleups
• Experience with integrating AI/ML capabilities into backend services
• Containerization and orchestration experience with Docker and Kubernetes
• Knowledge of event-driven architectures and message queuing systems
• Domain-driven design principles

 

Technologies you'll work with

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• Java (currently version 11, migrating to 21)
• JVM web frameworks: Spring, Jersey, Ktor, Dropwizard
• SQL
• MongoDB
• PostgreSQL
• Maven
• RESTful API
• Microservices
• AWS
• Docker, Kubernetes
• Event-driven architecture

 

Client – why choose this particular client from the Jit portfolio?

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Our client is an innovative, international technology company operating in the proptech and construction tech sectors. Their mission is to make building projects more collaborative and efficient worldwide.

They have created a modern cloud platform that enables effective management of project data throughout the entire building lifecycle – from planning and design, through construction, to maintenance.

The company operates globally and collaborates with leading partners in the architecture, engineering, and construction industries. Its solutions are built on open standards, ensuring smooth integration with other tools and easy access to information for all project participants.

 

About Jit Team

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The Human factor of IT - it's not just a slogan, it's a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 500 experienced experts. We create highly specialised teams for clients from all over the world. We offer team members developmental projects, a wide range of benefits and a proprietary professional development programme.

Behind our maxim are also charitable and educational activities. We support pupils and students by donating learning equipment. We offer internships to help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We are a Polish company and we share what we have achieved over 15 years of activity. By supporting indigenous initiatives, we ensure the circulation of good energy.