Senior Flink Developer

🏢 Summary: Hybrid Java Developer role focused on building and maintaining enterprise applications supporting critical business operations and next-generation management platforms. The position involves developing streaming applications, collaborating in Agile Scrum teams, applying BDD and CI/CD practices, and supporting global IT operations. Candidates will work with Java, Spring technologies, and Apache Kafka in a fast-paced international environment. 🗂️ Requirements: 2+ years of Java programming experience, Knowledge of Spring Framework, Knowledge of Spring Boot, Knowledge of Apache Kafka, Experience with Agile methodologies, Understanding of Scrum, Awareness of TDD, Awareness of BDD, Familiarity with CI/CD practices, Ability to refactor and improve legacy code, English proficiency at B2 level 📃 Skills: Java, Spring, SpringBoot, Kafka, Flink, Maven, Gradle, SQL, Unix, Scrum, CI/CD, BDD, TDD 🏢 Description: We are looking for a passionate Java Developer to join a global team that develops and maintains a suite of enterprise applications. The system supports critical business operations and serves as the foundation for a next-generation management platform. Team members work closely with operations teams and business analysts to provide global solutions for varied business requirements, with a strong focus on software craftsmanship, quality, and automation. This role offers a hybrid model, with 3 days per week working from the client's office in Krakow. Responsibilities Develop new features and maintain the existing codebase Build streaming applications with Apache Flink Write unit, integration, and behavior tests Cooperate within a successful scrum development team built on mutual respect Collaborate to refine user requirements through behavior-driven development (BDD) Partner with other global IT teams Provide level 3 support, assisting the production operations team in the rollout and support-related matters Requirements 2+ years of experience in Java programming Background in the Spring stack (Spring Framework, Spring Boot) Knowledge of Apache Kafka Showcase of clean coding and refactoring skills with great problem-solving ability Hands-on experience with Agile methodologies, especially Scrum Awareness of test- and behavior-driven development Familiarity with CI/CD practices Capability to improve older code bases, as well as apply modern best practices to new projects Proactive mindset, comfortable working in dynamic environments with fast-paced deliveries and changing requirements Strong written and verbal communication skills in English (B2 level), and the desire to work as part of a global team Nice to have Expertise in Apache Flink Proficiency in build tools (Apache Maven, Gradle) Skills in SQL databases Hands-on experience with Unix EPAM is a leading global provider of digital platform engineering and development services. We are committed to having a positive impact on our customers, our employees, and our communities. We embrace a dynamic and inclusive culture. Here you will collaborate with multi-national teams, contribute to a myriad of innovative projects that deliver the most creative and cutting-edge solutions, and have an opportunity to continuously learn and grow. No matter where you are located, you will join a dedicated, creative, and diverse community that will help you discover your fullest potential.

🏢 Summary: The offer is for a Java Developer to build and maintain enterprise applications that power critical business operations and a next-generation management platform. The role focuses on developing new features, building streaming applications with Apache Flink, and ensuring high code quality through testing and Agile practices. You will collaborate with global teams, support production environments, and contribute to continuous improvement and automation. 🗂️ Requirements: 2+ years of Java programming experience, Experience with Spring Framework and Spring Boot, Knowledge of Apache Kafka, Experience with Agile methodologies (Scrum), Understanding of test-driven and behavior-driven development, Familiarity with CI/CD practices, Ability to refactor and improve legacy codebases, English proficiency at B2 level 📃 Skills: Java, Spring, SpringBoot, Kafka, Flink, Scrum, CI/CD, BDD, TDD, Maven, Gradle, SQL, Unix 🏢 Description: We are looking for a passionate Java Developer to join a global team that develops and maintains a suite of enterprise applications. The system supports critical business operations and serves as the foundation for a next-generation management platform. Team members work closely with operations teams and business analysts to provide global solutions for varied business requirements, with a strong focus on software craftsmanship, quality, and automation. Responsibilities Develop new features and maintain the existing codebase Build streaming applications with Apache Flink Write unit, integration, and behavior tests Cooperate within a successful scrum development team built on mutual respect Collaborate to refine user requirements through behavior-driven development (BDD) Partner with other global IT teams Provide level 3 support, assisting the production operations team in the rollout and support-related matters Requirements 2+ years of experience in Java programming Background in the Spring stack (Spring Framework, Spring Boot) Knowledge of Apache Kafka Showcase of clean coding and refactoring skills with great problem-solving ability Hands-on experience with Agile methodologies, especially Scrum Awareness of test- and behavior-driven development Familiarity with CI/CD practices Capability to improve older code bases, as well as apply modern best practices to new projects Proactive mindset, comfortable working in dynamic environments with fast-paced deliveries and changing requirements Strong written and verbal communication skills in English (B2 level), and the desire to work as part of a global team Nice to have Expertise in Apache Flink Proficiency in build tools (Apache Maven, Gradle) Skills in SQL databases Hands-on experience with Unix We offer/Benefits We gather like-minded people: Engineering community of industry professionals Friendly team and enjoyable working environment Chance to work abroad for up to 60 days annually Business-driven relocation opportunities We provide growth opportunities: Outstanding career roadmap Leadership development, career advising, soft skills, and well-being programs Certification (GCP, Azure, AWS) Unlimited access to LinkedIn Learning, Get Abstract, Cloud Guru English classes We cover it all: Stable income (Employment Contract) Participation in the Employee Stock Purchase Plan Benefits package (health insurance, multisport, shopping vouchers) Strategically located offices featuring entertainment and relaxation zones, table tennis and football, free snacks, fantastic coffee, and more Referral bonuses Corporate, social and well-being events Please, note: The set of bonuses might vary based on the role you apply for – specifics will be discussed with our recruiter during the general interview We will reach out to selected candidates exclusively

🏢 Summary: Mid-level Java Developer role focused on building and delivering software aligned with a long-term product roadmap, ensuring high-quality, user-centric solutions. The position involves full-cycle development, task estimation, and close collaboration within a cross-functional team. The role also requires active participation in CI/CD processes and hybrid work availability. 🗂️ Requirements: Mid-level experience with Java 8/17, Experience with Spring Boot and Hibernate, Experience with Maven and functional libraries, Proficiency in Oracle PL/SQL, Experience with Swagger for API documentation, Practical knowledge of CI/CD tools, Ability to work in hybrid model at least one day per week, Fluent English communication skills 📃 Skills: Java, Spring, Hibernate, Maven, Vavr, Oracle, PLSQL, Swagger, Bitbucket, Jenkins, Sonar, Kubernetes, ELK, CI/CD 🏢 Description: Key Responsibilities: Software Development: Build and deliver software according to project requirements and a multi-year product roadmap. User-Centric Design: Collaborate with the team to shape software functionality to best meet user expectations. Quality Assurance: Maintain high-quality solutions through thorough test coverage, code reviews, and a focus on user needs. Project Management: Perform task estimation, planning, and provide proactive status reporting to the team. Team Collaboration: Foster a supportive environment by sharing knowledge and assisting other team members. Technical Requirements: Java Stack: Solid mid-level experience with Java 8/17, Spring Boot, Hibernate, Maven, and functional libraries like vavr. Data & Messaging: Proficiency in Oracle PL/SQL, and API documentation using Swagger. DevOps Ecosystem: Practical knowledge of CI/CD tools including Bitbucket, Jenkins, Sonar, Kubernetes, and ELK. Soft Skills: A collaborative "team player" attitude with the ability to communicate fluently in English. Work Model: Ability to work in a hybrid setup, including at least one day per week.

🏢 Summary: Backend Developer role focused on designing and building scalable, cloud-based applications using Java and Spring Boot in a microservices architecture. The position involves developing and deploying distributed, event-driven services on Azure using modern containerization and API technologies. The offer emphasizes building reliable, high-quality backend systems with up-to-date cloud-native practices. 🗂️ Requirements: Strong Java development experience, Experience with Spring Boot, Experience with microservices architecture, Experience with cloud-native applications, Familiarity with Azure, Knowledge of Kafka or similar messaging systems, Understanding of GraphQL or REST APIs, Experience with Docker, Experience with Kubernetes 📃 Skills: Java, Spring, SpringBoot, Microservices, Azure, Kafka, GraphQL, REST, Docker, Kubernetes 🏢 Description: We are seeking a talented Backend Developer to join our team, contributing to the design and development of modern, cloud-based applications. The role focuses on building scalable and maintainable services using up-to-date technologies and best practices. Key Responsibilities: Develop and maintain backend services using Java and Spring Boot . Build and support microservices solutions for distributed systems. Work with cloud platforms such as Azure , including event-driven architectures. Implement and consume APIs using GraphQL or REST. Package and deploy applications using Docker and Kubernetes . Collaborate with team members to deliver reliable, high-quality software. Required Skills & Experience: Strong background in Java development with Spring Boot . Experience with microservices and cloud-native applications. Familiarity with Azure , Kafka , or similar messaging/event systems. Understanding of API design ( GraphQL /REST). Practical experience with containerization ( Docker , Kubernetes ). Nice to Have: Knowledge of CI/CD practices and automated deployments. Experience with monitoring, logging, or observability in distributed systems.

🏢 Summary: The role focuses on developing and maintaining Java-based backend services that integrate multiple systems and support data processing workflows in a cloud environment. It involves building APIs, optimizing databases, and collaborating on ETL/ELT pipelines and CI/CD automation. The position requires close cooperation with data engineers to ensure reliable, high-quality data integration and system performance. 🗂️ Requirements: Strong experience in Java development, Good knowledge of SQL and relational databases, Experience with REST API development and system integrations, Understanding of ETL/ELT concepts and data pipelines, Experience with cloud environments, preferably Azure, Experience with CI/CD pipelines and DevOps practices, Ability to troubleshoot data flows and integration issues 📃 Skills: Java, SQL, REST, API, Azure, ETL, ELT, CICD, DevOps, AzureSQL, DataLake, Synapse, ADF, Messaging 🏢 Description: Key Responsibilities Design, develop, and maintain backend services and applications using Java . Build and support data integration layers and APIs connecting various systems. Collaborate closely with Azure Data Factory Engineers on ETL/ELT processes and data pipelines. Integrate systems using REST APIs and other data exchange mechanisms . Work with databases and optimize queries using SQL . Support data processing workflows and ensure data consistency and quality. Participate in CI/CD processes and contribute to automation and deployment pipelines. Troubleshoot and resolve issues related to data flow and system integrations. Collaborate with cross-functional teams including data engineers, analysts, and business stakeholders. Required Skills Strong experience in Java development . Good knowledge of SQL and relational databases . Experience working with REST APIs and system integrations . Understanding of data processing, ETL/ELT concepts , or data pipelines. Familiarity with cloud environments , preferably Microsoft Azure . Experience with CI/CD pipelines and DevOps practices . Strong problem-solving and analytical skills. Good communication skills and ability to work in a collaborative environment. Nice to Have Experience working with Azure Data Factory (ADF) or close collaboration with data teams. Familiarity with Azure services such as Azure SQL, Data Lake, or Synapse. Experience with messaging systems or event-driven architectures . Knowledge of data modeling concepts .

🏢 Summary: Senior Java Developer role focused on building and optimizing high-throughput, event-driven backend microservices in a distributed architecture based on Kafka. The position involves designing scalable and reliable systems using modern Java and Spring Boot within an agile, international environment. Work includes performance optimization, asynchronous communication, and implementation of DDD and Event Sourcing patterns. 🗂️ Requirements: 5+ years of Java backend development experience, Strong hands-on experience with Kafka producer/consumer design and optimization, Experience with SQL and relational databases (Oracle, DB2, MSSQL or similar), Experience building distributed, high-availability, high-performance systems, Practical knowledge of Domain-Driven Design (DDD) and Event Sourcing, Experience with microservices architecture, Fluent English 📃 Skills: Java, Spring, Kafka, SQL, Oracle, DB2, MSSQL, Docker, Git, Maven, Microservices, CI/CD, DDD, EventSourcing, Splunk, Grafana 🏢 Description: We’re looking for a Senior Java Developer to support the development of business-critical backend services in a distributed, high-throughput architecture. The system is built on Kafka-based asynchronous communication and designed with a strong focus on performance, scalability, and reliability. You will be involved in designing and developing clean, event-driven microservices, working closely with experienced engineers in an international, agile setup. Tech stack Java 11+, Spring Boot Apache Kafka – producer/consumer optimization, retries, partitioning SQL: Oracle / DB2 / MSSQL Docker, Git, Maven Microservices architecture CI/CD pipelines Domain-Driven Design (DDD), Event Sourcing Monitoring: Splunk / Grafana (nice to have) What we expect 5+ years of experience in Java backend development Strong hands-on skills in Kafka producer/consumer design and optimization Solid experience in SQL and relational databases (Oracle, DB2, MSSQL or similar) Proven background in building distributed, high-availability, high-performance systems Practical understanding of DDD, Event Sourcing, microservices, and clean architecture Fluent English for daily collaboration

🏢 Summary: Senior-level Java engineering role focused on building a secure, scalable, blockchain-based payment platform using modern cloud-native and microservices architecture. The position involves designing and developing high-quality backend services, event-driven systems, and APIs in a distributed environment. The role emphasizes architectural ownership, scalability, and production-grade system reliability. 🗂️ Requirements: 8+ years of commercial experience in Java development, Strong experience with Spring Boot, Experience designing distributed systems and microservices architecture, Hands-on experience with Kafka and/or Azure Event Hub, Production experience with GraphQL, Practical experience with Docker, Practical experience with Kubernetes, Experience delivering cloud-based scalable solutions, Strong knowledge of system design and integration patterns, Understanding of high-availability systems 📃 Skills: Java, Spring, SpringBoot, Kafka, Azure, EventHub, GraphQL, Docker, Kubernetes, Microservices, Blockchain, Cloud 🏢 Description: Lead Java Engineer We are looking for a highly experienced Java Engineer to join an advanced financial technology initiative focused on building a next-generation payment solution leveraging blockchain concepts. The project aims to create a secure, scalable, and enterprise-ready platform enabling seamless value transfers between financial entities. Role Responsibilities: Design and develop high-quality backend services using Java and Spring Boot Architect and enhance microservices-based systems Implement event-driven solutions using technologies such as Kafka and Azure Event Hub Design and expose APIs (including GraphQL) for efficient data exchange Work with containerized environments using Docker and Kubernetes Contribute to architectural decisions, scalability improvements, and performance optimization Ensure clean code standards, system reliability, and production readiness Requirements: 8+ years of commercial experience in Java development Strong background in Spring Boot and distributed systems architecture Hands-on experience with event streaming platforms (Kafka and/or Azure Event Hub) Experience with GraphQL in production environments Practical knowledge of containerization and orchestration (Docker, Kubernetes) Experience delivering cloud-based, scalable solutions Solid understanding of system design, integration patterns, and high-availability systems Opportunity to work on an innovative financial platform built with modern, cloud-native technologies.

🏢 Summary: Technical leadership role focused on designing, developing, and scaling complex system-level solutions in areas such as deployment, monitoring, databases, and load balancing. The position combines hands-on programming with architectural ownership and coordination of a small engineering team. Emphasis is placed on building reliable, high-performance distributed systems within large-scale infrastructure. 🗂️ Requirements: Extensive programming experience, Experience designing complex IT systems, Ability to lead technical design and implementation, Experience leading project teams, Strong knowledge of concurrent programming, Strong knowledge of distributed systems, Performance analysis and optimization skills, Understanding of infrastructure components (deployment, monitoring, databases, load balancing), Ability to conduct code reviews, C1 English, C1 Polish 📃 Skills: Java, Python, Kubernetes, Prometheus, Aerospike, Memcached, GCP, BigQuery, MinIO, Kafka, ClickHouse, PostgreSQL, Elasticsearch, Jenkins, Graphite, Concurrency, DistributedSystems, LoadBalancing, Monitoring, Deployment 🏢 Description: If you enjoy working on technically complex and challenging solutions, have a strong interest in system-related topics such as deployment, monitoring, databases, and load balancing, and have experience leading the design and development of complex projects while coordinating the work of others, this role could be a great fit for you. You Will: Plan and then hands-on lead further development within a given technical area like deployment, monitoring, databases or load balancing, in the context of existing infrastructure within RTB House; Coordinate the work of a project team of 3-4 people, also making arrangements with other teams and units within RTB House; Ensure the reliability and scalability of the solutions built. Desired Experience: Excellent understanding of how complex IT systems work - from the hardware level, through software, to algorithms; Ability to proactively define requirements, ask appropriate questions and draw conclusions that will combine technical constraints and business needs; Ability to lead the design and implementation of a solution; Experience in leading project teams; Willingness to be involved in topics that go beyond programming and design, such as responsibility for technical areas or communication with other teams; Proactive attitude, independence in taking action; Extensive experience in programming and readiness to implement key system elements as well as involvement in code reviews; Good knowledge of methods of creating concurrent programs and distributed systems; Ability to critically analyze created solutions in terms of performance (from estimating the theoretical performance of designed systems to detecting and removing actual performance problems in production); C1 level in English and Polish. Selected technologies used: Java, Python Kubernetes, Prometheus Aerospike, Memcached Google Cloud Platform, BigQuery, MinIO Kafka, Clickhouse PostgreSQL Elasticsearch Jenkins, Graphite We Offer: Attractive compensation; Work in a team of enthusiasts who are willing to share their knowledge and experience; Flexible cooperation conditions - we do not have core hours, we do not have holiday limits; Access to the latest technologies and the possibility of real use of them in a large-scale and highly dynamic project; You can work fully remotely or in a hybrid model (we have an office in Warsaw and Cracow).

🏢 Summary: The role involves designing and developing Java-based tools and frameworks to support functional and performance testing within a QA team. It focuses on building automated solutions, improving testing efficiency, and contributing to software design, performance analysis, and code quality. The position also includes collaboration, technical documentation, and mentoring junior engineers. 🗂️ Requirements: 5+ years of software development experience, Strong proficiency in Java, Experience with SpringBoot, Experience with JPA and Hibernate, Experience building RESTful services, Knowledge of relational databases (DB2 or PostgreSQL), Strong understanding of Object-Oriented Programming, Understanding of Concurrent Programming, Experience with Git version control, Ability to write unit tests and conduct code reviews, English proficiency 📃 Skills: Java, SpringBoot, JPA, Hibernate, REST, DB2, PostgreSQL, SQL, OOP, Concurrency, Git, JUnit, Kafka, CQRS, Docker, Kubernetes 🏢 Description: Java Developer Role Overview Design and develop tooling to support functional and performance testing within the QA team. Implement automated solutions that improve testing efficiency and reliability. Provide hands-on development of test frameworks, utilities, and performance test tooling. Technical Skills Required 5+ years of development experience Proficiency in Java, SpringBoot, JPA, Hibernate, RESTful services Knowledge of relational databases (DB2/PostgreSQL) Good understanding of Object-Oriented and Concurrent Programming Solid experience with version control systems (preferred GIT) Language: English Bonus: Knowledge of event streaming, CQRS, Kafka, Docker/Kubernetes High-Level Task Assignment Perform hands-on software design and development. Investigate performance issues, support root-cause analysis, and collaborate on improvements. Write unit tests and perform peer design/code reviews. Provide technical solutions to complex problems and write technical documents. Work closely with requirements engineers to estimate and developed to quality products. Mentor and help grow junior members of the engineering team.

🏢 Summary: The offer is for a software engineer role focused on designing and optimizing high-performance, low-latency systems handling over 24 million queries per second. The position involves building scalable and reliable distributed components, improving performance, and developing monitoring and testing tools in a production environment. The role emphasizes high availability, scalability, and working with modern cloud and data technologies. 🗂️ Requirements: Proficiency in programming, Strong understanding of complex IT systems from hardware to algorithms, Knowledge of Internet protocols (DNS, HTTP, cookies), Knowledge of concurrent programming and distributed systems, Experience with monitoring and analyzing production systems, Ability to optimize system performance and resolve performance issues, Knowledge of high scalability and high availability concepts, C1 level English, C1 level Polish 📃 Skills: Java, Python, Aerospike, Memcached, GCP, BigQuery, MinIO, Kafka, Clickhouse, PostgreSQL, Elasticsearch, Kubernetes, Prometheus, Jenkins, Graphite, DNS, HTTP 🏢 Description: You Will: Design and programming of a wide range of modules and components as part of a system that supports over 24M queries per second and low latency. Work on the optimization of the developed software in terms of response time and resource consumption Ensure the reliability and scalability of the solutions built Create performance and correctness tests for new system components Analyse new technologies in terms of their applicability in production conditions Develop tools for monitoring and analysing the operation of the production system Continuous optimization of existing tools and processes Desired Experience: Proficiency in programming Excellent understanding of how complex IT systems work (from the hardware level, through software, to algorithmics) Very good knowledge of fundamental Internet protocols and technologies (DNS, HTTP, cookies and others) Good knowledge of basic methods of creating concurrent programs and distributed systems (from thread level to continent level) Practical ability to observe, monitor and analyse the operation of production systems (and draw valuable conclusions from it) The ability to critically analyze the solutions created in terms of performance (from estimating the theoretical performance of the designed systems to detecting and removing actual performance problems in production) General knowledge of issues (typical problems and methods of solving them) in the areas of 'high scalability' and 'high availability' C1 level in English and Polish Selected Technologies: Java, Python Aerospike, Memcached Google Cloud Platform, BigQuery, MinIO Kafka, Clickhouse PostgreSQL Elasticsearch Kubernetes, Prometheus Jenkins, Graphite We Offer: Projects focused on extreme performance and high code quality – clean code and solid code reviews are our standard. Collaboration within an interdisciplinary, self-sufficient team (including DevOps, database experts, backend developers, product designers, and QA engineers). Access to modern technologies and the opportunity to apply them in large-scale, high-impact projects. Cooperation based on B2B contract. You can cooperate 100 % remotely or choose one of our office spaces in Warsaw or Cracow. Apply now! You don't need to tick every box to apply. If you are passionate about digital marketing, send us your CV, and we'll review it.