Java Tech Lead

Salary: 1300-1600 pln/md on B2BWork model: Hybrid from Warsaw or 100% remote with occasional European workshops Why choose this offer?You will work in a truly international environment, collaborating with distributed teams and stakeholders from multiple countriesOpportunity to own system design and architecture and directly impact product scalability and reliabilityJoin a company building a global SaaS platform used in the construction technology sectorWork in a culture that values autonomy, trust, and innovation ProjectWe are looking for an experienced Java Tech Lead with a strong focus on designing and maintaining scalable distributed systems. You will contribute to building high-performance backend architectures that ensure reliability, fault tolerance, and efficiency at scale. You will be developing RESTful APIs, optimizing system performance, and implementing secure, well-documented interfaces. Proven ability to work cross-functionally with ops, feature teams and product stakeholders to deliver resilient, production-grade solutions that power seamless user experiences is needed. Join us if You are passionate about systems design, scalability challenges, and leveraging modern technologies to solve complex infrastructure problems What you'll be working onDesigning and maintaining scalable distributed systemsBuilding high-performance backend architecturesEnsuring reliability, fault tolerance, and efficiency at scaleDeveloping RESTful APIsOptimizing system performanceImplementing secure, well-documented interfacesCollaborating with ops, feature teams, and product stakeholdersDiscussing and documenting designs of APIs and internal subsystemsWorking with modern data stores (relational, NoSQL, etc.) Skills & experience we're looking forDeep understanding of Java or other JVM-hosted languagesFamiliarity with key distributed systems concepts: consensus algorithms, consistency models, causality, fault toleranceComfortable discussing and documenting API and subsystem designsWorking knowledge of relational and NoSQL data storesStrong CS fundamentals: Big-O, parsers, data structures & algorithmsBuilding event-driven applicationsBackground in scale-up environments Nice to haveWorking with Rust and/or GolangLinux file and network I/O primitivesKnowledge of Kubernetes and containerisationApplying DDD and architectural patterns: onion, hexagonal, microkernelAwareness of modern authn/authz approaches and off-the-shelf solutionsUnderstanding of common network protocols: TCP, TLS, HTTP Technologies you'll work withJavaJVM ecosystemRESTful APIsSQLnoSQLRust/GolangLinuxKubernetesDDDEvent-driven architecture Client – why choose this particular client from the Jit portfolio?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 TeamThe 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 700 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.