Senior Performance Engineer

🏢 Summary: Senior technical role leading the design, optimization, and delivery of core business applications within a large IT transformation program. The position focuses on Java-based microservices, cloud and DevOps adoption, and collaboration with architecture and infrastructure teams. It combines hands-on development expertise with technical leadership across strategic platforms. 🗂️ Requirements: 6+ years of experience with Java microservices, Strong experience with JEE and Spring Boot, Experience in API and REST development, Proficiency in Kubernetes, Proficiency in Python, Experience with cloud migration projects, Hands-on experience with Oracle Database and WebLogic, Experience with messaging systems such as IBM MQ or WebSphere, Knowledge of IT security standards, Understanding of functional and technical architecture principles, Fluency in English 📃 Skills: Java, JEE, SpringBoot, REST, API, Microservices, Kubernetes, Python, Oracle, WebLogic, IBMMQ, WebSphere, DevOps, Agile, CloudMigration, Architecture, Security 🏢 Description: Key Responsibilities: Technical Leadership: Provides expert technical guidelines and support to IT analysts and development teams. Application Optimization: Identifies improvement and optimization opportunities for major core business applications. Strategic Delivery: Contributes to the delivery of high-priority projects within core business platforms. Infrastructure Collaboration: Partners with Architects, Security, and Infrastructure teams to design and evolve technical solutions. IT Transformation: Drives the adoption of DevOps, Agile methodologies, and AI readiness as part of broader group transformation programs. Technical Requirements: Java Expertise: Over 6 years of experience with Java microservices, JEE, Spring Boot, and API/REST development. Cloud & DevOps: Proficiency in Kubernetes and Python, with cloud migration expertise and DevOps knowledge listed as significant advantages. Data & Middleware: Experience with Oracle components (Database, WebLogic) and messaging flows such as IBM MQ or WebSphere. Standards & Architecture: Deep awareness of IT security standards, quality metrics, and functional/technical architecture principles. Professional Skills: Fluency in English with the ability to present complex technical topics to senior stakeholders.

🏢 Summary: Backend-focused role involving development of scalable web applications using Java and React/Next.js. The position includes building and optimizing server-side components, APIs, and databases while ensuring performance and security. Close collaboration with cross-functional teams and end-to-end responsibility for backend quality and scalability are expected. 🗂️ Requirements: Minimum 4 years experience in similar role, Proficiency in Java server-side programming, Strong knowledge of React and Next.js, Experience with React Router and Redux, Experience with MySQL, PostgreSQL or MongoDB, Experience building scalable web applications, Knowledge of web performance and security principles, Experience with Git version control, Ability to conduct testing and debugging, English level B2 or higher 📃 Skills: Java, React, Next.js, Redux, ReactRouter, MySQL, PostgreSQL, MongoDB, SQL, NoSQL, API, REST, Git, AWS, Azure, GCP, Docker, NodeJS, Security, Testing 🏢 Description: Responsibilities: Designing, developing, and maintaining the server-side logic of web applications Implementing scalable and efficient server-side components and APIs Build React/Next.js based applications Working with relational and/or NoSQL databases to store and retrieve data efficiently Designing and optimizing database schemas for performance and scalability Integrating third-party APIs and web services to enhance application functionality Developing custom APIs to facilitate communication between front-end and back-end systems Implementing security best practices to protect against common web application vulnerabilities Conducting regular security audits and implement necessary measures Optimization: optimizing server-side code for maximum speed and scalability Monitoring and troubleshooting performance issues Collaborating with front-end developers, UI/UX designers, and other team members to ensure seamless integration of components Using version control systems (e.g., Git) to manage and track changes to the codebase Conducting thorough testing of server-side components to identify and fix bugs Collaborating with QA engineers for comprehensive testing Clear and comprehensive documentation for back-end systems and APIs Requirements: At least 4 years of experience in a similar position Proficiency in Java server-side programming Thorough understanding of React/Next.js core principles along with React router, hooks, Redux (or the like) workflows, Web performance and security Experience with database systems (e.g., MySQL, PostgreSQL, MongoDB) Proven experience in back-end development and building scalable web applications Strong analytical and problem-solving skills with attention to detail Effective communication skills to collaborate with cross-functional teams Ability to adapt to changing project requirements and technologies English at least B2 Nice to have: Familiarity with cloud platforms (e.g., AWS, Azure, GCP) Previous experience in Front-end development with Docker Experience with NodeJS Offer: Private medical care Co-financing for the sports card Constant support of dedicated consultant Employee referral program

🏢 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: Hybrid B2B opportunity for an experienced NFT Application Performance Engineer to optimize and certify the performance of complex Java/WebLogic applications within a Core Banking environment. The role focuses on performance testing, monitoring, bottleneck analysis, and implementing scalability improvements. The contract offers long-term cooperation with a rate up to 160 PLN net + VAT per hour. 🗂️ Requirements: Proven experience as Performance Engineer or similar role, Strong understanding of application architecture, Experience with performance optimization techniques, Proficiency with JMeter, Experience with AppDynamics, Experience in performance monitoring for WebLogic applications, Knowledge of web server configuration and optimization, Strong analytical and problem-solving skills, Strong communication and collaboration skills 📃 Skills: Java, WebLogic, JMeter, AppDynamics, PerformanceTesting, PerformanceMonitoring, WebServers, Temenos 🏢 Description: General info: Model of work: hybrid (3 times per week work from office: Warsaw/ Gdańsk/ Gdynia/ Łódź) Type of contract: B2B, long-term cooperation Rate: up to 160 PLN net + vat/ hour Introduction & Summary: We are seeking a talented and experienced NFT Application Performance Engineer to join our team. As a Java Application Performance Engineer, you will be responsible for optimizing the performance and scalability of our Weblogic applications, ensuring a seamless and efficient user experience. This role is critical for performance certification for a complex Core Banking solution. Main Responsibilities: Conduct performance testing and analysis to identify bottlenecks and areas for improvement in Java/Weblogic application performance. Develop and implement performance optimization strategies to enhance the speed, responsiveness, and scalability of Java/Weblogic applications. Collaborate with software developers and architects to design and implement performance enhancements and optimizations. Monitor and analyze web application performance metrics using monitoring tools and systems. Identify and troubleshoot performance issues, both proactively and reactively, and provide recommendations for resolution. Stay up-to-date with industry trends and best practices in web application performance engineering. Key Requirements: Proven experience as a Performance Engineer or a similar role. Strong understanding of application architecture and performance optimization techniques. Proficient in performance testing tools and methodologies (Jmeter). Experience with performance monitoring and analysis tools (e.g., AppDynamics). Experience with performance monitoring and analysis specifically for Weblogic applications. Familiarity with web server configurations and optimization. Excellent problem-solving and analytical skills. Strong communication and collaboration skills. Nice to Have: Experience with Temenos Core Banking would be an advantage.

🏢 Summary: Backend Java Developer role focused on building scalable, high-performance server-side applications using Spring Boot. The position involves database design, API development (REST/SOAP), search optimization with ElasticSearch, and maintaining high code quality within CI/CD environments. The role requires strong experience in the Java ecosystem and collaboration with cross-functional teams. 🗂️ Requirements: Minimum 4 years of backend development experience with Java, Strong hands-on experience with Spring Boot, Practical experience with Hibernate ORM, Experience with MS SQL databases, Experience with ElasticSearch or similar search engines, Proficiency in REST and SOAP API development, Experience working with JSON and XML, Basic knowledge of HTML, CSS, JavaScript, Experience with Git version control, Understanding of CI/CD pipelines and tools like Jenkins or TeamCity, Experience with Docker 📃 Skills: Java, Spring, SpringBoot, Hibernate, MSSQL, ElasticSearch, REST, SOAP, JSON, XML, HTML, CSS, JavaScript, Git, Jenkins, TeamCity, Docker 🏢 Description: Key Responsibilities Core Backend Development: Designing and developing robust, scalable, and high-performance server-side applications using Java and the Spring Boot framework. Database Management: Designing efficient database schemas, writing optimized queries, and managing data persistence using Hibernate and MS SQL. API Design & Integration: Building, integrating, and maintaining secure RESTful and SOAP web services (WebApi, WCF) to ensure seamless communication between systems. Search Optimization: Implementing and tuning efficient search and indexing solutions utilizing ElasticSearch. Code Quality & Mentorship: Writing clean, maintainable, and well-tested code while participating in code reviews to ensure alignment with industry best practices. Requirements Experience: Minimum 4 years of professional experience in backend development with a strong focus on the Java ecosystem. Frameworks & ORM: Deep understanding and hands-on experience with Spring Boot and Hibernate. Databases & Search: Practical knowledge of MS SQL and experience with ElasticSearch or similar search engines. Web Services & Formats: Proficiency in developing APIs (REST/SOAP) and working comfortably with JSON and XML data formats. Front-End Basics: General understanding of web technologies (HTML, CSS, JavaScript) to effectively collaborate with front-end teams. Tools & Version Control: Strong command of Git and a solid understanding of CI/CD workflows (e.g., Jenkins/TeamCity, Docker).

🏢 Summary: Backend development role focused on maintaining and modernising the Corporate Netbank application in an Agile/SAFe environment. The position involves developing backend services and REST APIs, implementing new features, resolving production issues, and working with both microservice and monolithic architectures. The role also includes unit testing, legacy code analysis, and collaboration with international teams. 🗂️ Requirements: Backend development experience, REST API development, Microservices architecture knowledge, Monolithic architecture knowledge, Unit testing skills, Experience analysing legacy code, Agile methodology knowledge, SAFe environment experience, Production incident support experience 📃 Skills: REST, Microservices, Monolith, Agile, SAFe, Backend, APIs, Testing 🏢 Description: Developing, maintaining, and enhancing the Corporate Netbank application Implementing new features and improvements based on business and technical requirements Fixing bugs and supporting the resolution of production incidents Implementing compliance and mandatory business changes Designing and implementing backend services according to given specifications Writing and maintaining REST APIs Working with both microservice-based and monolithic architecture Implementing unit tests to ensure high-quality delivery Analysing and working with legacy code Collaborating with international teams in an Agile/SAFe environment Supporting the ongoing modernisation of the existing system

🏢 Summary: The role focuses on designing and executing automated testing strategies to ensure software quality, stability, and performance. It involves building and maintaining automated test frameworks, performing regression and performance testing, and collaborating with development teams to resolve defects. The position also supports data-related solutions and continuous improvement of QA processes. 🗂️ Requirements: Minimum 4 years of experience in software testing, Experience with automated testing using Playwright, Experience with Git and creating test frameworks, Ability to design and execute automated test cases, Experience with regression and performance testing, Ability to prepare and manage test data, Experience in defect tracking and lifecycle management, Understanding of ETL concepts and data validation, Familiarity with cloud-based data environments 📃 Skills: Playwright, Git, ETL, Azure, AWS, Fabric, Automation, Regression, Performance, Testing 🏢 Description: Responsibilities: Develop comprehensive test plans based on project requirements and specifications Work with stakeholders to define testing scope, objectives, and strategies Create detailed and effective test cases covering various scenarios, edge cases, and user workflows Ensure test cases align with business requirements and acceptance criteria Execute automated test cases to identify defects and ensure software functionality Conduct regression testing to validate the stability of new features and updates Develop and maintain automated test scripts to enhance testing efficiency Identify opportunities for test automation and implement automation frameworks Log, prioritize and track defects through their lifecycle Work closely with development teams to investigate, reproduce, and resolve issues Collaborate with developers, product managers, and other stakeholders to understand software requirements and user expectations Provide feedback on the quality of deliverables and suggest improvements Conduct performance testing to evaluate software performance under different conditions Identify and address performance bottlenecks Create and maintain clear and concise documentation of test plans, test cases, and testing processes Contribute to the continuous improvement of QA processes and methodologies Requirements: At least 4 years of experience in a similar position Experience in automatic testing using Playwright Experience with Git (able to create test framework within as well) Ability to prepare test data according to the data solution feature Ability to automate our work as much as possible Ability to test all elements automatically as much as possible Knowledge of English at least B2 Strong analytical and problem-solving skills with attention to detail Effective communication skills to collaborate with cross-functional teams Ability to adapt to changing project requirements and technologies Nice to have: QA experience with Data Solution (understand certain degree of ETL concept, how to test data correctness) Understanding the basic data solution tech stack such as Azure, AWS, Fabric

🏢 Summary: This offer is for an experienced Application Performance Engineer to work on a complex Core Banking solution, focusing on performance, scalability, and reliability of Java applications running on WebLogic. The role involves performance testing, tuning, and monitoring to ensure high system efficiency and seamless user experience. You will collaborate with cross-functional teams in an international environment with flexible work organization and strong work-life balance. 🗂️ Requirements: Proven experience as Performance Engineer or similar role, Strong understanding of application architecture, Experience in performance optimization, Hands-on experience with JMeter, Experience with monitoring tools, Strong experience with WebLogic performance tuning, Knowledge of web server configuration, Strong analytical skills, Strong problem-solving skills, Strong communication skills 📃 Skills: Java, WebLogic, JMeter, AppDynamics, Temenos 🏢 Description: Why choose this offer? You can expect a flexible work organization The international work environment will give you the opportunity to interact with the English language on a daily basis Scandinavian organizational culture will provide you with work-life balance, you will gain time for additional training (financed by Jit) The Jit community will bring you a nice time during regular integration meetings Project We are looking for an experienced Application Performance Engineer to join a team working on a complex Core Banking solution . The role focuses on ensuring top-tier performance, scalability, and reliability of Java-based applications running on WebLogic, contributing directly to a seamless user experience and system efficiency. Responsibilities you'll have Conduct performance testing and analysis to identify bottlenecks and improvement areas Design and implement performance optimization strategies for Java/WebLogic applications Collaborate with developers and architects to introduce performance enhancements Monitor application health using performance monitoring tools Investigate and resolve performance issues proactively and reactively Analyze performance metrics and provide actionable recommendations Stay up-to-date with performance engineering best practices Expected competences and knowledge Proven experience as a Performance Engineer or similar role Strong understanding of application architecture and performance optimization Hands-on experience with performance testing tools (JMeter) Experience with monitoring tools (e.g., AppDynamics) Strong experience with WebLogic performance tuning and analysis Knowledge of web server configuration and optimization Excellent analytical and problem-solving skills Strong communication and collaboration skills Nice to have Experience with Temenos Core Banking Technologies you'll work with Java WebLogic JMeter AppDynamics Web application performance tools Client – why choose this particular client from the Jit portfolio? Jit Team has had an over-decade-long relationship with the leading financial group in the Nordic countries, and we are privileged to be our client's premier partner in Poland. At present, over 200 Jit personnel are engaged in the completion of more than 60 projects for this Norwegian major provider of financial services with a global presence and a strong focus on modern technology. Our customer's work atmosphere is epitomized by the Scandinavian culture , which is conducive to people who place emphasis on work-life balance and feedback culture . Furthermore, all projects are executed in international teams, giving constant exposure to the English language.

🏢 Summary: Frontend Developer role focused on building and maintaining modern web applications using React.js. The position involves creating responsive, user-centered interfaces, integrating RESTful APIs, and delivering scalable, maintainable frontend solutions. Emphasis is placed on performance, accessibility, and clean code standards. 🗂️ Requirements: 3–4+ years commercial frontend development experience, Strong hands-on experience with React.js, Proficiency in modern JavaScript (ES6+), Solid knowledge of HTML5 and CSS3, Experience with responsive design principles, Experience integrating RESTful APIs, Understanding of UI/UX best practices, Familiarity with state management, Experience with component-based architecture, Experience with Git and collaborative workflows, Ability to write scalable and maintainable code, Strong debugging and problem-solving skills 📃 Skills: React, JavaScript, ES6, HTML5, CSS3, REST, API, Git, UI, UX 🏢 Description: Responsibilities Develop and maintain modern web applications using React.js . Create responsive and intuitive user interfaces with a strong focus on usability and user experience. Connect frontend applications with RESTful APIs and backend systems. Translate business and design requirements into scalable frontend solutions. Write clean, reusable, and maintainable code following frontend development standards. Collaborate closely with designers, product owners, and backend engineers. Optimize application performance, accessibility, and cross-browser compatibility. Requirements 3–4+ years of commercial experience in frontend development. Strong hands-on experience with React.js and modern JavaScript (ES6+). Solid knowledge of HTML5, CSS3, and responsive design principles. Experience integrating APIs and working with backend services. Understanding of UI/UX best practices and user-centered design. Familiarity with state management and component-based architecture. Experience with Git and collaborative development workflows. Ability to write efficient, scalable, and well-structured frontend code. Strong problem-solving and debugging skills.

🏢 Summary: The offer is for an experienced Performance Tester to deliver performance testing projects for the banking and financial sector. The role focuses on evaluating, analyzing and optimizing the performance, scalability and stability of high-availability systems used by thousands of users. The position involves close collaboration with development and infrastructure teams to identify bottlenecks and improve system efficiency. 🗂️ Requirements: Minimum 3–4 years of experience as Performance Tester or similar role, Experience in designing and executing performance tests, Practical knowledge of JMeter, LoadRunner, Gatling or NeoLoad, Ability to analyze logs, metrics and test results, Knowledge of web application architecture and distributed systems, Experience with databases and SQL, Knowledge of REST API and integration services, Ability to identify performance issues at application and infrastructure level, Experience with Jira and Confluence, English level B2–C1 📃 Skills: JMeter, LoadRunner, Gatling, NeoLoad, SQL, REST, Jira, Confluence, Grafana, Prometheus, Dynatrace, AppDynamics, Splunk, AWS, Azure, GCP, Docker, Kubernetes, Kafka 🏢 Description: O projekcie Poszukujemy doświadczonego Performance Testera do realizacji projektów dla sektora bankowego i finansowego. Osoba na tym stanowisku będzie odpowiedzialna za ocenę wydajności, skalowalności oraz stabilności aplikacji i systemów biznesowych wykorzystywanych przez tysiące użytkowników. Jeżeli interesują Cię testy wydajnościowe, analiza wydajności systemów oraz optymalizacja aplikacji działających w środowiskach o wysokiej dostępności – zapraszamy do aplikowania. Twój zakres obowiązków Planowanie, projektowanie i realizacja testów wydajnościowych Przygotowywanie scenariuszy testowych dla testów obciążeniowych, wydajnościowych, stresowych i długotrwałych Analiza wydajności aplikacji, baz danych oraz systemów integracyjnych Identyfikacja wąskich gardeł oraz rekomendowanie działań optymalizacyjnych Współpraca z zespołami developerskimi, architektami oraz administratorami infrastruktury Monitorowanie wykorzystania zasobów podczas testów Przygotowywanie raportów oraz rekomendacji po przeprowadzonych testach Wsparcie procesów wdrożeniowych i optymalizacyjnych Tworzenie oraz utrzymanie dokumentacji testowej Nasze wymagania Minimum 3–4 lata doświadczenia na stanowisku Performance Testera lub pokrewnym Doświadczenie w projektowaniu i realizacji testów wydajnościowych Znajomość narzędzi takich jak JMeter, LoadRunner, Gatling lub NeoLoad Umiejętność analizy logów, metryk oraz wyników testów Znajomość zagadnień związanych z architekturą aplikacji webowych i systemów rozproszonych Doświadczenie w pracy z bazami danych oraz SQL Znajomość REST API i usług integracyjnych Umiejętność identyfikowania problemów wydajnościowych na poziomie aplikacji i infrastruktury Doświadczenie w pracy z Jira oraz Confluence Znajomość języka angielskiego na poziomie B2–C1 Mile widziane Doświadczenie z narzędziami monitoringu (Grafana, Prometheus, Dynatrace, AppDynamics, Splunk) Znajomość środowisk chmurowych AWS, Azure lub GCP Doświadczenie w testowaniu architektury mikroserwisowej Znajomość Docker i Kubernetes Certyfikat ISTQB Performance Testing lub ISTQB Foundation Level Doświadczenie w sektorze bankowym lub finansowym Znajomość Apache Kafka lub systemów kolejkowych Oferujemy Udział w projektach dla renomowanych instytucji bankowych i finansowych Możliwość pracy zdalnej lub hybrydowej Elastyczne godziny pracy Stabilną współpracę przy długoterminowych projektach Możliwość rozwoju kompetencji w obszarze Performance Testing i Quality Engineering Dostęp do nowoczesnych narzędzi testowych oraz środowisk technologicznych Współpracę z doświadczonymi ekspertami IT Realny wpływ na wydajność i jakość kluczowych systemów biznesowych Atrakcyjne wynagrodzenie adekwatne do doświadczenia i kompetencji Jeżeli chcesz rozwijać swoje kompetencje w obszarze testów wydajnościowych, uczestniczyć w zaawansowanych projektach technologicznych oraz odpowiadać za jakość systemów wykorzystywanych przez miliony użytkowników – zapraszamy do aplikowania.