Lead Java Developer (e-commerce)

🏢 Summary: Opportunity to develop a large-scale e-commerce platform as a senior Java/Kotlin engineer. The role focuses on scalable distributed components, AI/LLM integration, architectural decision-making, and close collaboration in a hybrid Warsaw-based team. 🗂️ Requirements: 5+ years of Java development experience, Proven delivery of highly complex software solutions, Java ecosystem expertise, Experience with Python or Go, Experience with Apache Spark, Hadoop, Mesos and TensorFlow, Knowledge of TDD, DDD, CI/CD and pair programming, Experience or strong interest in LLM integration and agentic systems, Ability to design and implement complex system components, Experience with architecture, technical trade-offs, risks, dependencies and technical debt, Focus on code quality, stability, scalability, monitoring and logging, Polish and English communication skills at B2 level or higher, Availability for hybrid work from the Warsaw office 📃 Skills: Java, Kotlin, Groovy, Spring, Python, Go, Spark, Hadoop, Mesos, TensorFlow, TDD, DDD, CI/CD, LLM, GCP, Kubernetes 🏢 Description: Our expectations - Minimum 5 years of experience as a Java Developer - Proven track record as a Software Engineer delivering highly complex solutions - Knowledge and experience with the Java ecosystem: Java, Kotlin, Groovy and Spring Framework - Experience with other languages: Python and Go - Experience with Apache Spark, Apache Hadoop, Apache Mesos and TensorFlow - Knowledge of engineering practices and methodologies: TDD, DDD, CI/CD and pair programming - Fundamental experience and strong interest in AI-driven solutions, particularly LLM integration and agentic systems/frameworks - Ability to lead the design and implementation of complex system features and components - Strong ownership of delivered solutions, including code quality, stability, scalability and observability through monitoring and logging - Experience driving architectural decisions and evaluating technical trade-offs - Ability to identify and manage technical risks, dependencies and technical debt - Ability to evaluate technical decisions through the lens of user impact, rather than solely fulfilling specifications - Strong collaboration skills when working with engineers, Product Managers and UX/UI Designers - High autonomy and accountability - Advanced Polish and English communication skills, at least B2 level - Openness to hybrid work from the Warsaw office Nice to have - Practical experience with cloud environments, preferably GCP, and Kubernetes - Experience working with large-scale, distributed systems - Experience in cross-team collaboration within complex organizational structures - Technical mentorship and knowledge sharing within the project team - Ability to advise on technical best practices and optimize engineering standards across the project Main responsibilities - Design, build and maintain highly scalable, robust Kotlin-based features and distributed components - Take full ownership of code quality, observability and technical-debt management - Drive the technical implementation of AI capabilities by integrating LLMs, agentic frameworks and smart automation into the core platform to improve the end-user experience - Work autonomously within a specialist team and collaborate with Product Managers, UX Designers and cloud engineers working with GCP and Kubernetes - Evaluate technical trade-offs, manage technical risks and mentor the team

🏢 Summary: The offer is for a Project Coordinator role supporting engineering and business teams by organizing tasks, maintaining documentation, and ensuring alignment with company OKRs. The position focuses on structured project tracking, cross-team communication, and keeping priorities and deadlines on track using project management tools. It involves working in a tech environment with an opportunity to contribute to long-term product development. 🗂️ Requirements: Minimum 3 years of experience in a tech company, Experience in project coordination, business analysis, marketing, sales, or cross-team collaboration role, Experience with Jira or Asana, Ability to maintain structured project documentation in English (C1), Strong organizational and prioritization skills, General understanding of tech company operations, Ability to align projects with OKRs 📃 Skills: Jira, Asana, HTTP, JavaScript, Cookies, Databases, English, OKRs, Documentation, ProjectManagement 🏢 Description: Your Responsibilities: Support engineering and business teams by keeping priorities clear, tasks organized, and communication flowing. Maintain structured, up-to-date project documentation, ensuring plans, progress, and key information are easy to follow. Organize tasks in project management tools (Jira, Asana), track deadlines, and follow up to keep projects moving. Ensure the projects you manage are aligned with departmental and company OKRs. Build good working relationships across teams and roles, translating between different perspectives and helping everyone stay on the same page. Desired Experience: Minimum 3 year of experience in a tech company in a role such as project coordination, business analysis, marketing, sales, or another role involving cross-team collaboration. Problem-solving attitude, prioritization skills, and curiosity to grow in the field of project management. General understanding of how tech companies operate. Experience with task/project management tools such as Jira or Asana. English (C1) – you will have to write and upkeep documentation in English. Excellent written and verbal communication. Strong organizational and structured work habits. Ability to work with different personalities and approaches. Proactive, straightforward, and reliable attitude. Nice to have: Familiarity with web technologies (HTTP, JavaScript, cookies, databases). Polish language. Analytical skills and ability to interpret data. We Offer: Stable cooperation based on B2B contract and contract of mandate. Access to the latest technology in the developed solution. Opportunity to build and improve our own products, where long-term quality and reliability truly matter. Participation in one of the most interesting projects of the online industry in Poland and one of the fastest growing technology companies in Europe.

🏢 Summary: Development of a large-scale e-commerce platform leveraging AI and NLP technologies to enhance search, content quality, and process automation. The role involves designing and implementing complex microservices-based solutions, integrating LLMs, and ensuring high standards of scalability, stability, and observability in a cloud environment. The position includes full lifecycle development within an agile team, from architecture decisions to deployment and maintenance. 🗂️ Requirements: At least 5 years of experience with Kotlin and Java, Strong knowledge of Spring framework, Experience with Gradle and Reactor, Experience with Azure Spring Apps, Practical experience with microservices architecture, Experience with MongoDB, CosmosDB, or Elasticsearch, Proficiency in designing and implementing REST APIs, Experience with AI-based solutions and LLM integration, Ability to design and implement complex system components, Experience in architectural decision-making, Knowledge of monitoring and logging practices, Good command of English (B2/C1 level) 📃 Skills: Kotlin, Java, Spring, Gradle, Reactor, Azure, MongoDB, CosmosDB, Elasticsearch, REST, LLM, AI, NLP, Microservices, GCP, Kubernetes 🏢 Description: Development of an e-commerce project for a client that is one of the largest companies in this sector in the country. A project utilizing AI and NLP technologies for large-scale analysis and processing of text content, supporting key digital platform functionalities such as search, content quality, and process automation Our expectations Extensive, at least 5 years, experience with Kotlin and Java witch proven track record in delivering high-complexity solutions. Strong knowledge of Spring, Gradle, Reactor, and Azure Spring Apps. Practical experience working within a microservices architecture. Familiarity with databases such as MongoDB, CosmosDB, and Elasticsearch. Proficiency in designing and working with REST APIs. Experience and a strong interest in AI-based solutions, specifically LLM integration. Ability to lead the design and implementation of complex system functionalities and components. Strong sense of ownership over delivered solutions, including code quality, stability, scalability, and observability (monitoring, logging). Experience in architectural decision-making and evaluating technical trade-offs. Ability to identify and manage technical risks, dependencies, and technical debt. Evaluating technical decisions and high level of autonomy and accountability. Good command of English (B2/C1 level). Readiness to work in a hybrid workmodel, fostering a collaborative and engaging team environment. Nice to have Hands-on experience with cloud environments (GCP preferred) and Kubernetes. Experience working with large, distributed systems. Experience in cross-team collaboration within complex organizational structures. Providing technical consultancy and knowledge sharing within the project team. Advising on technical best practices and optimizing engineering standards within the project. Main responsibilities Software development within a development team using agile methodology Participation in team meetings and collaborative creation and execution of assigned tasks Active involvement in delivering increasingly better programming solutions throughout the full project lifecycle — code reviews, testing others’ changes, deployment, maintaining cloud infrastructure, and creating documentation

🏢 Summary: Long-term B2B role focused on hands-on Java and React development within a microservices architecture, contributing directly to production code and system design. The position combines backend and frontend engineering with architectural responsibilities in a global, collaborative environment. The role supports high-frequency delivery in a financial services context. 🗂️ Requirements: Strong experience with Java, Strong experience with ReactJS, Experience with microservices architecture, Experience delivering RESTful APIs, Experience with PostgreSQL, Recent experience with modern Java versions, Experience delivering code changes at high frequency, Background in financial sector, preferably banking 📃 Skills: Java, ReactJS, Microservices, REST, PostgreSQL 🏢 Description: Working mode : Hybrid - 6 days per month at the Kraków office Contract type : B2B, long term cooperation Summary: This role focuses on hands-on development and system architecture, driving engineering culture, and enhancing business growth through technical expertise in a collaborative, global environment. Main Responsibilities: Deliver code to production and support system architecture aligned to microservices Understand business, engineering, and non-functional requirements Drive the desired engineering culture across teams Collaborate with a globally diverse team across regions Proactively remove impediments, assess risks, and communicate issues to program management Identify and eliminate process inefficiencies Key Requirements: Strong Java and React programming experience Experience in microservice architecture Background in the financial sector, particularly banking Proven capability of delivering code changes at high frequency Experience with RESTful API delivery Familiarity with PostgreSQL databases Recent Java experience, preferably with the latest versions Experience with ReactJS for UI application development Nice to Have: Knowledge of containers and orchestration technologies like Docker and Kubernetes.

🏢 Summary: Long-term B2B opportunity for a senior engineer to deliver production-ready code and shape system architecture in a microservices environment. The role combines hands-on Java and React development with architectural responsibilities in a global, collaborative setup. It focuses on high-frequency delivery and technical excellence within the financial sector. 🗂️ Requirements: Strong Java experience (latest versions), Strong React experience, Experience with microservices architecture, Experience delivering RESTful APIs, Experience with PostgreSQL, Proven high-frequency code delivery, Experience in banking or financial sector 📃 Skills: Java, React, Microservices, REST, PostgreSQL, Banking, Docker, Kubernetes 🏢 Description: Working mode : Hybrid - 6 days per month at the Warsaw office Contract type : B2B, long term cooperation Rate : 200 PLN/h Summary: This role focuses on hands-on development and system architecture, driving engineering culture, and enhancing business growth through technical expertise in a collaborative, global environment. Main Responsibilities: Deliver code to production and support system architecture aligned to microservices Understand business, engineering, and non-functional requirements Drive the desired engineering culture across teams Collaborate with a globally diverse team across regions Proactively remove impediments, assess risks, and communicate issues to program management Identify and eliminate process inefficiencies Key Requirements: Strong Java and React programming experience Experience in microservice architecture Background in the financial sector, particularly banking Proven capability of delivering code changes at high frequency Experience with RESTful API delivery Familiarity with PostgreSQL databases Recent Java experience, preferably with the latest versions Experience with ReactJS for UI application development Nice to Have: Knowledge of containers and orchestration technologies like Docker and Kubernetes. Other Details: This position offers the opportunity to work within a multi-regional team on innovative projects. Ideal for candidates seeking to leverage their development skills in a dynamic and evolving business context.

🏢 Summary: Experienced Java Developer role focused on building, testing, deploying, and maintaining scalable enterprise backend applications. The position involves Java, Spring Boot, microservices, REST APIs, databases, CI/CD, and collaboration with cross-functional teams in a hybrid Kraków setup. 🗂️ Requirements: 7+ years of Java application development experience, Core Java expertise (Java 8/11/17), Spring Boot and Spring MVC expertise, Microservices architecture and RESTful web services experience, Hibernate/JPA experience, Relational database experience, Git version control proficiency, Maven or Gradle knowledge, JUnit and Mockito testing experience, Understanding of design patterns and object-oriented programming principles 📃 Skills: Java, SpringBoot, SpringMVC, Microservices, REST, Hibernate, JPA, SQL, Git, Maven, Gradle, JUnit, Mockito, CI/CD, DevOps 🏢 Description: We are seeking an experienced Java Developer with strong expertise in designing, developing, and maintaining enterprise-grade applications. The ideal candidate has hands-on experience with Core Java, Spring Boot, microservices, REST APIs, and database technologies, along with a solid understanding of software development best practices. Key Responsibilities - Design, develop, test, and deploy scalable Java-based applications. - Build and maintain RESTful APIs and microservices. - Develop backend services using Java, Spring Boot, and related frameworks. - Collaborate with business analysts, architects, and development teams to understand requirements. - Write clean, maintainable, and efficient code following coding standards. - Troubleshoot, debug, and optimize application performance. - Participate in code reviews and ensure high-quality deliverables. - Work with CI/CD pipelines and DevOps practices for application deployment. - Ensure application security, reliability, and scalability. Required Skills - 7+ years of experience in Java application development. - Strong expertise in Core Java (Java 8/11/17), Spring Boot, Spring MVC, microservices architecture, RESTful web services, and Hibernate/JPA. - Experience with relational databases such as SQL Server, Oracle, MySQL, or PostgreSQL. - Proficiency in Git and version control systems. - Knowledge of Maven/Gradle build tools. - Experience with unit testing frameworks such as JUnit and Mockito. - Understanding of design patterns and object-oriented programming principles. Benefits - Stable long-term cooperation with opportunity for extension. - Opportunity to work with modern technologies in an international environment. - Professional growth and continuous development opportunities. - Participation in challenging and impactful projects.

🏢 Summary: Senior frontend/full-stack developer role focused on building resilient, enterprise-ready product features for a sports and health platform. The position involves React, TypeScript, Next.js, REST APIs, PostgreSQL, and close remote collaboration, with a hybrid schedule in Kraków. 🗂️ Requirements: 5+ years of professional development experience, Production experience with React and TypeScript, Production experience with Next.js App Router, REST API and data-validation experience, PostgreSQL and ORM experience, Ability to follow architectural documentation and team conventions, Git, code review, and Jira experience, Independent problem analysis and written feature planning/ADRs, Careful handling of healthcare data, schemas, and access logic, Strong written technical communication, Remote and asynchronous collaboration skills, Advanced English, Ability to complete a technical coding test without assistance, Availability to start within one month, Ability to work from the Kraków office 3 days per week 📃 Skills: React, TypeScript, Next.js, REST, Zod, PostgreSQL, Drizzle, Prisma, TypeORM, Git, Jira, Claude 🏢 Description: About the role You will assist with understanding, architecture, implementation, and quality of core product roadmap items that move the client project forward. You will collaborate closely with the team, make an immediate impact as an early contributor, solidify the product’s resilience, and learn to roll out enterprise-ready features. Required skills / knowledge and production experience • React + TypeScript • Next.js (App Router): routing, server/client components, API routes • REST API and data validation (for example, Zod) • PostgreSQL and an ORM (Drizzle or similar, such as Prisma or TypeORM) • Ability to work according to team conventions and architectural documentation (ADRs), including reading and following established standards before writing code • Git, code review, and ticketing (Jira) • Daily coding with Claude • Minimum 5 years of professional hands-on developer experience Communication and other required skills • Independence in problem analysis and willingness to plan before implementation; the project requires a written plan/ADR before each new feature • Accuracy and attention to detail when changing healthcare-data schemas and access logic • Good written communication for documentation, PR descriptions, tickets, and code-review comments • Comfort working in a distributed/remote team with asynchronous communication • Openness to feedback and willingness to propose simpler solutions instead of over-engineering • Ownership of delivered functionality from design through implementation • Advanced English; daily calls with a native CTO and weekly calls with a native CEO • Ability to discuss technical problems and describe concepts, architecture, or planned features Selection process There will be an online or onsite technical coding test in Kraków, completed without extra help, plus a general and/or technical English conversation. Nice to have • Supabase: Auth, RLS, PostgreSQL • AWS S3, SQS, and Lambda, including designing or integrating data-processing pipelines such as multipart uploads, task queues, and workers • Terraform / IaC, including the ability to read infrastructure definitions • Experience with video, media data, or large-volume files, such as recording processing, LiDAR, or wearable data • Designing RBAC permission systems for multiple user roles • OpenAPI / API contracts and endpoint documentation • Experience with health, sports, telemedicine, or other sensitive/regulated data • Application observability with Sentry, PostHog, or similar tools • Real-time integrations, such as chat/video SDKs, CometChat, or WebSocket Benefits • Product focused on sports and health • Private medical care and Multisport card • Flexible working hours, with a start time between 8:00 and 10:00 a.m. • Choice of computer: macOS, Linux, or Windows • Upskilling budget • Weekly English discussion classes • Parking spot a few minutes from the office • Employee recommendation program Work arrangement and start date The office is in Kraków, with work from the office 3 days per week. The recruitment process has 2 stages and is conducted remotely. The ideal candidate can start within one month.

🏢 Summary: Long-term B2B hybrid role focused on hands-on Java and React development within a microservices architecture, contributing directly to production code and system design. The position emphasizes high-frequency delivery, REST API development, and collaboration in a global engineering environment. It combines technical leadership with active development in financial-sector projects. 🗂️ Requirements: Strong experience with Java, Strong experience with ReactJS, Experience with microservices architecture, Experience delivering RESTful APIs, Experience with PostgreSQL, Recent experience with modern Java versions, Ability to deliver code changes frequently, Background in banking or financial sector 📃 Skills: Java, ReactJS, Microservices, REST, PostgreSQL, Docker, Kubernetes 🏢 Description: Working mode: Hybrid - 6 days per month at the Kraków office Contract type: B2B, long term cooperation Rate: 200 PLN/h Summary: This role focuses on hands-on development and system architecture, driving engineering culture, and enhancing business growth through technical expertise in a collaborative, global environment. Main Responsibilities: Deliver code to production and support system architecture aligned to microservices Understand business, engineering, and non-functional requirements Drive the desired engineering culture across teams Collaborate with a globally diverse team across regions Proactively remove impediments, assess risks, and communicate issues to program management Identify and eliminate process inefficiencies Key Requirements: Strong Java and React programming experience Experience in microservice architecture Background in the financial sector, particularly banking Proven capability of delivering code changes at high frequency Experience with RESTful API delivery Familiarity with PostgreSQL databases Recent Java experience, preferably with the latest versions Experience with ReactJS for UI application development Nice to Have: Knowledge of containers and orchestration technologies like Docker and Kubernetes. Other Details: This position offers the opportunity to work within a multi-regional team on innovative projects. Ideal for candidates seeking to leverage their development skills in a dynamic and evolving business context.

🏢 Summary: Opportunity for an experienced backend software professional to design and build complex server-side systems from scratch, define project-wide technical solutions, and establish development best practices. The role focuses on Java/Kotlin, Spring, databases, microservices, and software architecture, with flexible hours and remote-work options. 🗂️ Requirements: 3+ years of IT experience, Hands-on Java 8+ or Kotlin experience, Hands-on Spring Boot/Framework experience, Knowledge of RDBMS, ORM, and NoSQL databases, Knowledge of client-server architecture and microservices, Practical OOP and design-pattern skills, English sufficient for technical project discussions 📃 Skills: Java, Kotlin, Spring, RDBMS, ORM, Hibernate, JOOQ, MyBatis, NoSQL, Microservices, OOP 🏢 Description: We are looking for experienced professionals who can design and develop complex software systems from scratch, design project-wide technical solutions, and establish and control best development practices. What we expect from you: - 3+ years of experience in IT - Hands-on experience with modern Java technologies for server solutions: Kotlin, Java 8+, Spring Boot/Framework - Knowledge of RDBMS and ORM: Hibernate, JOOQ, MyBatis; NoSQL databases - Architectural knowledge of client-server system principles and microservices; practical skills with design patterns and OOP - English sufficient for participating in technical project discussions It would be a plus to have: - Experience with frontend development: HTML5, JavaScript/TypeScript, Angular, React, or other technologies - Hands-on experience with cloud services: Microsoft Azure, AWS, Google Cloud - Experience setting up and supporting development processes: CI/CD, code review, static code analysis, automated testing - Experience working with Scrum - Experience creating technical documentation We offer: - Projects for clients including PayPal, Wargaming, Xerox, Philips, Adidas, and Toyota - Competitive compensation based on qualifications and skills - Career development system with clear skill qualifications - Flexible working hours aligned to your schedule - Remote-work options

🏢 Summary: Oferta dotyczy rozwoju natywnej aplikacji Android dla projektu e-commerce, z wykorzystaniem Kotlin i Compose. Praca obejmuje współpracę hybrydową z Warszawy raz w tygodniu oraz pracę z procesami budowania i CI. 🗂️ Requirements: Minimum 4 lata komercyjnego doświadczenia na podobnym stanowisku, Biegła znajomość Kotlin, Biegła znajomość Compose, Dogłębna znajomość Android SDK i programowania natywnego, Znajomość OOP, algorytmów i struktur danych, Znajomość Gradle i systemów CI, Język polski: poziom native, Język angielski: poziom B2, Gotowość do pracy hybrydowej z Warszawy 1 raz w tygodniu 📃 Skills: Kotlin, Compose, Android, OOP, Gradle, CI 🏢 Description: Projekt e-commerce. Wymagania - Minimum 4 lata komercyjnego doświadczenia na podobnym stanowisku - Biegła znajomość języka Kotlin oraz frameworka Compose do tworzenia interfejsów użytkownika - Dogłębna znajomość Android SDK oraz programowania natywnego - Praktyczna znajomość programowania obiektowego (OOP), algorytmów oraz struktur danych - Znajomość procesów budowania projektów w Gradle oraz doświadczenie w pracy z systemami Continuous Integration (CI) - Wysoki poziom samodzielności w organizacji pracy oraz skuteczne umiejętności rozwiązywania problemów - Znajomość języka polskiego na poziomie native oraz języka angielskiego na poziomie B2 - Otwartość na pracę hybrydową z Warszawy (1 x w tygodniu) Mile widziane - Doświadczenie w pracy z architekturą modułową (np. znajomość Kotlin Multiplatform Mobile – KMM) - Doświadczenie w pracy z dużymi bazami kodu - Praktyczna znajomość Test-Driven Development (TDD) oraz Pair Programming - Doświadczenie w tworzeniu oprogramowania wspieranego przez AI, np. z wykorzystaniem narzędzi takich jak Copilot