Senior Ruby on Rails Developer

🏢 Summary: B2B contract for a Senior Ruby on Rails Developer to build and enhance a client platform, focusing on backend development, testing, performance optimization, and occasional React frontend work. The role involves solving complex engineering challenges, conducting code reviews, and collaborating with cross-functional teams in a remote-first environment. Emphasis is placed on scalable, reliable systems and data-driven product development. 🗂️ Requirements: 5+ years Ruby on Rails experience, Strong knowledge of ActiveRecord, Experience with RSpec, Experience with AWS or Heroku in production, Experience with PostgreSQL or other RDBMS, Experience with TDD and automated testing, Experience building MVC-based server-side applications, Experience building React components and integrating APIs, Understanding of distributed systems, Practical knowledge of REST APIs, B2+ level Polish and English, Experience with Agile methodologies 📃 Skills: Ruby, Rails, ActiveRecord, RSpec, AWS, Heroku, PostgreSQL, RDBMS, TDD, MVC, React, REST, Scrum, Kanban 🏢 Description: About us LLInformatics is a forward-thinking IT consulting firm, trusted by clients across Europe and North America. We specialize in delivering complex projects on time, with exceptional quality, and always meeting the highest compliance standards. Our remote-first team of 130+ experts is passionate about building cutting-edge digital products that drive real results. With a focus on data-driven decisions, measurable outcomes, and a strategic mindset, we’re raising the bar in our industry—backed by a strong, collaborative work culture that fuels our success. Contract Type: B2B Location: Remote or in our Warsaw office Your Tasks and Responsibilities: Implementing new functionalities on our client’s platform. Solving complex programming challenges while improving your knowledge. Conducting regular code reviews / PR reviews for your colleagues. Maintaining existing code and fixing bugs. Writing unit, integration, and E2E tests. Contributing to frontend components using React when needed. Supporting rapid iteration, experimentation, and data-driven development initiatives. Optimizing application performance, reliability, and scalability. Collaborating with Product Managers and cross-functional teams to align engineering execution with product vision. Requirements: 5+ years of experience in Ruby on Rails. Familiarity with Active Record and RSpec. Experience working on production applications in AWS or Heroku. Experience working with RDBMS like PostgreSQL. Experience writing tests / following a TDD approach or strong testing culture. Experience building server-side applications using the MVC pattern or similar. React experience (building components, integrating APIs). Understanding distributed systems and resilient applications. Practical knowledge of REST API communication. Polish and English at B2+ minimum level. Familiarity with Agile methodologies (Scrum, Kanban). Experience as a tech team lead is a strong plus. Demonstrated ability to leverage AI tools to improve workflows or development efficiency is a plus. Why join us? Flexible Working Hours – We focus on results! Manage your time, keep your team informed about your availability, and attend key meetings. Work from Anywhere – Choose your ideal setup! Work 100% remotely within the EU , go hybrid , or enjoy our Warsaw office , fully equipped for productivity. Comprehensive Onboarding – From day one, we ensure you feel comfortable and supported, so you can quickly become part of the team. Flat Structure – We value initiative and open communication. Every voice matters here! Positive Company Culture & Team Spirit – We create an environment where everyone feels appreciated and comfortable. Modern Work Methods – We use cutting-edge project management techniques inspired by the IT world. Transparent Communication – Regular 360° feedback sessions and mentor support to help you grow. Top-Notch Equipment – Get a MacBook for your work. If you choose to work from our Warsaw office , you'll also have access to a 34” (16:9) widescreen monitor and an ergonomic standing desk . Weekly English Lessons – Optional classes with a native speaker to help you improve your skills.

🏢 Summary: B2B contract for a Ruby on Rails Developer to build and maintain a client platform, implement new features, and ensure performance and reliability in a remote or hybrid setup. The role involves backend development with Rails, testing, database management, and occasional frontend support with React. You will collaborate in an Agile team to deliver high-quality, production-ready solutions. 🗂️ Requirements: 3+ years experience with Ruby on Rails, Knowledge of Active Record, Knowledge of RSpec, Experience with production applications, Familiarity with relational databases, Experience writing unit and integration tests, Understanding of MVC architecture, Basic experience with React, Understanding of REST API principles, English B2 level minimum, Polish B2 level minimum, Familiarity with Agile methodologies 📃 Skills: Ruby, Rails, ActiveRecord, RSpec, PostgreSQL, React, REST, AWS, Heroku, Scrum, Kanban, MVC 🏢 Description: About us LLInformatics is a forward-thinking IT consulting firm, trusted by clients across Europe and North America. We specialize in delivering complex projects on time, with exceptional quality, and always meeting the highest compliance standards. Our remote-first team of 130+ experts is passionate about building cutting-edge digital products that drive real results. With a focus on data-driven decisions, measurable outcomes, and a strategic mindset, we’re raising the bar in our industry—backed by a strong, collaborative work culture that fuels our success. Contract Type: B2B Location: Remote or in our Warsaw office Your Tasks and Responsibilities: Implementing new features on our client’s platform. Solving programming challenges and continuously developing your skills. Participating in code reviews and collaborating with team members. Maintaining the existing codebase and fixing bugs. Writing unit and integration tests (E2E is a plus). Supporting frontend development using React when needed. Contributing to product improvements through experimentation and iteration. Taking care of application performance and reliability. Collaborating with Product Managers and team members to deliver high-quality solutions. Requirements: 3+ years of experience with Ruby on Rails. Good knowledge of Active Record and RSpec. Experience working with production applications (AWS or Heroku is a plus). Familiarity with relational databases (e.g., PostgreSQL). Experience writing tests and understanding of testing best practices. Understanding of the MVC pattern or similar architectures. Basic experience with React (components, API integration). Understanding of REST API principles. English and Polish at a minimum B2 level. Familiarity with Agile methodologies (Scrum, Kanban). Nice to have: Experience with distributed systems. Interest in using AI tools to improve development workflow. Why join us? Flexible Working Hours – We focus on results! Manage your time, keep your team informed about your availability, and attend key meetings. Work from Anywhere – Choose your ideal setup! Work 100% remotely within the EU , go hybrid , or enjoy our Warsaw office , fully equipped for productivity. Comprehensive Onboarding – From day one, we ensure you feel comfortable and supported, so you can quickly become part of the team. Flat Structure – We value initiative and open communication. Every voice matters here! Positive Company Culture & Team Spirit – We create an environment where everyone feels appreciated and comfortable. Modern Work Methods – We use cutting-edge project management techniques inspired by the IT world. Transparent Communication – Regular 360° feedback sessions and mentor support to help you grow. Top-Notch Equipment – Get a MacBook for your work. If you choose to work from our Warsaw office , you'll also have access to a 34” (16:9) widescreen monitor and an ergonomic standing desk . Weekly English Lessons – Optional classes with a native speaker to help you improve your skills.

🏢 Summary: B2B role for an experienced QA Automation Engineer/SDET to design, develop, and scale Python-based UI and backend test automation frameworks for complex distributed systems. The position focuses on improving automation standards, reliability, and quality metrics while working with CI/CD pipelines and event-driven architectures. The role involves end-to-end ownership of test automation across multiple product areas in a remote or Warsaw-based setup. 🗂️ Requirements: Minimum 4+ years in Software Testing, QA Engineering or SDET roles, Strong experience in designing and developing test automation frameworks at scale, Advanced Python programming skills, Experience with API and backend testing in distributed systems, Hands-on experience with UI test automation tools, Strong SQL knowledge with ability to write complex queries, Experience with CI/CD pipelines and related tools, Practical knowledge of Linux environments and networking concepts, Experience with event-driven architectures or messaging systems, Strong debugging and log analysis skills, Ability to work independently and own automation across product areas, Experience contributing to or improving automation frameworks and standards 📃 Skills: Python, PyTest, Playwright, Selenium, SQL, Linux, Kafka, CircleCI, Git, Jira, TestRail, Sentry, CI/CD, API, Networking 🏢 Description: LLInformatics is an IT consulting company with dozens of satisfied clients across Europe and North America. We serve businesses that expect their challenging projects to be delivered according to plan, with impeccable quality, and under strict compliance requirements. Our remote-first team of 100+ experts specializes in building high-quality digital products. We set a new standard in our industry through data-driven decisions, measurable outcomes, a strategic mindset, and a solid work culture. Contract Type: B2B Location: Warsaw or the possibility of Remote work Your tasks and responsibilities: Design, develop, and maintain UI test automation frameworks for complex systems Work extensively with Python-based frameworks (e.g., PyTest, Playwright) and enhance existing automation libraries Apply strong Linux and networking knowledge in daily testing and debugging Write complex SQL queries for test data validation and automation support Deliver high-quality defect reports with logs, root cause analysis, and reproduction details Work with event-driven systems (e.g., Kafka in payments-related domains) Use and promote tools such as Jira, TestRail, Sentry, Git, and CircleCI within CI/CD workflows Independently deliver automation across multiple product areas Identify gaps in test coverage and proactively mitigate automation risks Continuously improve automation effectiveness and contribute to QA KPIs Drive reliability improvements in frameworks, tools, and test suites Communicate risks, blockers, and technical issues Take full ownership of quality for assigned areas Collaborate closely with engineers, architects, DevOps, and product teams Participate in cross-team discussions to improve system testability and design Share knowledge and best practices across engineering teams Oversee consistency and quality of Python-based automation frameworks Define and evolve automation standards and best practices Guide teams in selecting high-value test cases for automation Track and report key automation and quality metrics Support onboarding of new engineers and ensure smooth ramp-up Requirements: Minimum 4+ years of experience in Software Testing, QA Engineering, or SDET roles Strong hands-on experience in test automation design and development at scale Advanced Python programming skills with ability to build and maintain robust automation frameworks Experience with API and backend testing in complex distributed systems Practical knowledge of UI test automation tools (e.g., Playwright, Selenium or similar) Strong understanding of SQL, including writing complex queries for test data validation and automation purposes Experience working with CI/CD pipelines and related tools (e.g., CircleCI or similar) Familiarity with Linux environments and networking concepts used in day-to-day testing work Experience with event-driven architectures or messaging systems (Kafka experience is a strong plus) Solid understanding of debugging, log analysis, and root cause investigation in production-like environments Ability to read, interpret, and work with technical and functional documentation in English Strong ownership mindset with ability to work independently across multiple product areas Proven ability to improve or contribute to automation frameworks and testing standards Experience mentoring or supporting junior engineers is highly valued Strong collaboration skills and experience working closely with developers, DevOps, and product teams Why join us? Comprehensive Onboarding – From day one, we ensure you feel comfortable and supported, so you can quickly become part of the team. Flat Structure – We value initiative and open communication. Every voice matters here! Positive Company Culture & Team Spirit – We create an environment where everyone feels appreciated and comfortable. Modern Work Methods – We use cutting-edge project management techniques inspired by the IT world. Transparent Communication – Regular 360° feedback sessions and mentor support to help you grow. Top-Notch Equipment – Get a MacBook for your work. If you choose to work from our Warsaw office, you'll also have access to a 34” (16:9) widescreen monitor and an ergonomic standing desk. Weekly English Lessons – Optional classes with a native speaker to help you improve your skills.

🏢 Summary: A junior developer academy program offering hands-on experience with Ruby on Rails under mentorship, leading to potential full-time collaboration. Participants will build features, fix bugs, and write tests while deepening their understanding of web application development. The program starts on-site in Warsaw with the possibility of remote work later. 🗂️ Requirements: Basic knowledge of Ruby on Rails, Basic knowledge of JavaScript, Understanding of web application architecture, Ability to write unit, integration, and end-to-end tests, Upper-Intermediate English (B2+) 📃 Skills: Ruby, Rails, JavaScript, UnitTesting, IntegrationTesting, E2ETesting 🏢 Description: 🚀 LLI Academy 3rd Edition: Now Recruiting! We’re excited to launch the third edition of our LLI Academy – an initiative dedicated to discovering talented junior developers who are passionate about the IT world, coding, and eager to grow their skills in a professional environment. This program is designed to give promising developers the opportunity to gain hands-on experience, receive mentorship, and become a part of our dynamic team. Our previous editions were a great success, resulting in continued cooperation with amazing junior developers who joined our company full-time. Now, we’re looking for the next wave of talent to join us! About us LLInformatics is a forward-thinking IT consulting firm, trusted by clients across Europe and North America. We specialize in delivering complex projects on time, with exceptional quality, and always meeting the highest compliance standards. Our remote-first team of 100+ experts is passionate about building cutting-edge digital products that drive real results. With a focus on data-driven decisions, measurable outcomes, and a strategic mindset, we’re raising the bar in our industry, backed by a strong, collaborative work culture that fuels our success. 📍 Location: Warsaw (on-site for first 3 months), then possibility of remote work📄 Contract Type: UZ Your tasks and responsibilities: Develop your coding skills with the support of mentors and a structured curriculum Implement new features and functionalities Solve programming challenges while deepening your understanding of Ruby Participate in regular code reviews and receive feedback from experienced developers Maintain and improve existing codebases (bug fixing, refactoring) Write unit, integration, and end-to-end tests Requirements: Basic knowledge of Ruby on Rails Basic knowledge of JavaScript Eagerness to learn, improve, and tackle new challenges Logical and critical thinking skills Understanding of how web applications work A proactive, hands-on attitude towards solving problems Upper-Intermediate English ( B2+ ) Why join us? Flexible Working Hours – We focus on results! Manage your time, keep your team informed about your availability, and attend key meetings. Comprehensive Onboarding – From day one, we ensure you feel comfortable and supported, so you can quickly become part of the team. Flat Structure – We value initiative and open communication. Every voice matters here! Positive Company Culture & Team Spirit – We create an environment where everyone feels appreciated and comfortable. Modern Work Methods – We use cutting-edge project management techniques inspired by the IT world. Transparent Communication – Regular 360° feedback sessions and mentor support to help you grow. Top-Notch Equipment – Get a MacBook for your work. If you choose to work from our Warsaw office, you'll also have access to a 34” (16:9) widescreen monitor and an ergonomic standing desk. Weekly English Lessons – Optional classes with a native speaker to help you improve your skills.

🏢 Summary: Senior or Staff Product Engineer role focused on building and shipping intuitive, high-performance end-to-end web product experiences in an AI-native accounting platform. The position involves owning full-stack feature delivery from UI to server-side logic, collaborating directly with leadership and design, and setting engineering best practices. The role requires strong frontend expertise, cloud infrastructure knowledge, and hands-on work with modern AI tooling. 🗂️ Requirements: 5+ years of full-stack product engineering experience, Proven experience building and shipping production web applications, Strong practical experience with React and TypeScript, Experience designing and working with AWS or GCP cloud infrastructure, Ability to design and implement scalable server-side logic, Experience delivering end-to-end features from frontend to backend, Ability to work on-site 4–5 days per week in Wrocław 📃 Skills: TypeScript, React, Node.js, AWS, GCP, Terraform, PostgreSQL, OpenAI, Azure, GitHub, Figma, LLM 🏢 Description: ABOUT THE COMPANY We're an applied AI company building an AI-native alternative to legacy accounting software — a market worth tens of billions in annual recurring revenue. Our mission is to help entrepreneurs focus on what matters in their business and life, and to help their accountants become more strategic. We've raised $20M from a group of top-tier investors and have grown ARR 60% month-on-month since our public launch. We now serve thousands of businesses and are expanding our product to serve accountants directly — creating a two-sided platform where both business owners and their accountants use and recommend us. We're at an early but proven stage, moving fast, and building a world-class engineering team in Wrocław to match our ambition. ABOUT THE ROLE We're looking for a Senior or Staff Product Engineer with a strong track record of building intuitive, performant end-to-end product experiences. The defining quality of this role is craft — you care deeply about how things feel to use, and you're energised by the opportunity to make software feel like magic because AI is doing real work behind the scenes. You'll work directly with the CEO, Operations, AI, and Design teams to scope and ship user-facing features. There's no product manager layer here — you'll engage directly with users, iterate quickly, and own the quality of what you deliver from UI through to server-side logic. WHAT YOU'LL WORK ON End-to-end feature delivery Work directly with the CEO, Operations, AI, and Design teams to scope and ship polished, scalable user-facing features with beautiful UI components and robust server-side logic. Engineering best practices Redefine what best-in-class software development looks like for the team. You'll set the standard, not follow it. Technology evaluation Continuously research and evaluate new technologies to improve the speed, scalability, and performance of the product. Bring recommendations and drive adoption. User-focused iteration Engage directly with users to understand how the product is being used, iterate quickly, and deliver experiences that feel genuinely polished — not just functional. WHAT WE LOOK FOR 5+ years of full-stack product engineering A strong track record building and shipping full-stack production web applications that real users depend on. Modern frontend fluency Deep practical experience with React and TypeScript. You write frontend code that is fast, accessible, and maintainable — and you have an eye for detail in UI. Cloud infrastructure experience Familiarity with AWS or GCP architecture and design patterns, and an understanding of how infrastructure choices affect product performance and reliability. Strong communication Clear written and verbal communication. You can articulate trade-offs, give and receive direct feedback, and work well without a lot of process around you. Bonus Experience as a founder or early founding team member. Familiarity with modern LLM tooling and AI-assisted development (Cursor, Claude Code, etc). Background in finance or accounting. TECH STACK TypeScript, React, Node.js, AWS, Terraform, PostgreSQL, OpenAI, Azure AI. The team uses GitHub, Slack, Linear, Figma, and Notion day to day. THE TEAM Small, senior, and in-person. The office is in central Wrocław, next to the main train station. The expectation is 4–5 days a week in the office — this is a deliberate choice, not a compromise. Relocation support is available for the right candidate. COMPENSATION & BENEFITS Salary $130,000 – $190,000 USD depending on experience, plus competitive equity. Wellness and commute stipend $100 per month. Hardware Premium hardware provided — MacBook Pro and AirPods. Food Daily in-office lunch and dinner. Time off 20 PTO days plus 9 US public holidays. Relocation Support available for candidates relocating to Wrocław.

🏢 Summary: Full-stack developer role focused on building and enhancing a mission-critical platform in a distributed environment. The position involves designing high-quality software, extending reusable components, and supporting production systems. The role requires strong expertise in Java and distributed systems with a focus on performance and reliability. 🗂️ Requirements: Bachelor’s or Master’s degree in Computer Science or related field, 5-10 years of experience as a FullStack developer, Strong knowledge of algorithms, Strong knowledge of data structures, Strong knowledge of concurrency, Strong proficiency in Java, Experience with distributed systems, Ability to interpret business requirements, Strong problem-solving skills 📃 Skills: Java, NodeJS, Angular, SpringBoot, JavaScript, HTML, CSS, JSON, Kafka, Tibco, Tervela, Cassandra, NoSQL, Oracle, PLSQL, SQL, Tomcat, WebLogic, WebSphere, UNIX, Linux, Algorithms, DataStructures, Concurrency, DistributedSystems, Multithreading 🏢 Description: RITS Group is an IT company offering top-quality programming services for both the Polish and international markets. We are proud to be one of the fastest-growing technology companies. Our priority is the quality and innovation of the solutions we deliver, and our organizational culture is based on trust, collaboration, and continuous improvement. Oferujemy 100% remote work Salary up to 50USD /h/B2B Working hours must include 6 hours overlap with New York (ET) Obowiązki •    Creating new features and enhancing functionality on a mission critical platform •    Adapts and extend existing re-usable components and libraries. •    Develops high quality software while meeting deadlines •    Presents ideas for system improvements •    Design or upgrade an existing software to ensure product performance and quality expectations are met •    Assists with rollout and post production support Wymagania Must have: •    Master’s or Bachelor's degree in Computer Science or related discipline •    5-10 years of working experience as a full-stack developer, distributed systems experience is a plus •    Excellent written and verbal communication skills •    Strong ability to interpret business requirements •    Must be a creative problem solver •    Must demonstrate strong knowledge of algorithms, data structures, concurrency, and Java programming Nice to have: •    Java, Nodejs, Angular, Spring Boot, JavaScript, HTML, CSS, JSON •    Multi-threaded programming •    Experience with algorithms, data structures, and concurrency •    Kafka, Tibco Rendezvous, Tervela, or similar high-speed messaging system •    Experience with distributed database systems like, Cassandra or any other NoSQL database •    Oracle PL/SQL programming, Proficiency in SQL •    Tomcat, WebLogic, or WebSphere •    UNIX / Linux operating systems •    Experience with financial transaction systems •    Basic knowledge of the fixed income and financial markets is a plus. •    Excellent written and verbal communication skills •    Strong ability to interpret business requirements •    Must be a creative problem solver and should have good analytical thinking.

🏢 Summary: Full-stack Developer role focused on building and enhancing a mission-critical platform, including designing new features and improving existing components. The position involves developing high-quality software, optimizing system performance, and supporting distributed, high-throughput financial systems. The role also includes post-production support and continuous system improvements. 🗂️ Requirements: Bachelor’s or Master’s degree in Computer Science or related field, 5–10 years of experience as FullStack Developer, Strong knowledge of Java programming, Experience with distributed systems, Knowledge of algorithms and data structures, Experience with concurrency and multithreading, Experience with high-speed messaging systems, Experience with distributed NoSQL databases, Proficiency in SQL and Oracle PL/SQL, Experience with Java application servers, Experience with Unix or Linux systems, Experience with financial transaction systems 📃 Skills: Java, SpringBoot, JavaScript, HTML, CSS, JSON, Kafka, Tibco, Tervela, Cassandra, NoSQL, Oracle, PLSQL, SQL, Tomcat, WebLogic, WebSphere, Unix, Linux, Algorithms, DataStructures, Concurrency, Multithreading, DistributedSystems, FinancialSystems 🏢 Description: RITS Group is an IT company offering top-quality programming services for both the Polish and international markets. We are proud to be one of the fastest-growing technology companies. Our priority is the quality and innovation of the solutions we deliver, and our organizational culture is based on trust, collaboration, and continuous improvement. Responsibilities: •    Creating new features and enhancing functionality on a mission critical platform •    Adapts and extend existing re-usable components and libraries. •    Develops high quality software while meeting deadlines •    Presents ideas for system improvements •    Design or upgrade an existing software to ensure product performance and quality expectations are met •    Assists with rollout and post production support Requirements: •    Master’s or Bachelor's degree in Computer Science or related discipline •    5-10 years of working experience as a full-stack developer, distributed systems experience is a plus •    Excellent written and verbal communication skills •    Strong ability to interpret business requirements •    Must be a creative problem solver •    Must demonstrate strong knowledge of algorithms, data structures, concurrency, and Java programming •    Java, Spring Boot, JavaScript, HTML, CSS, JSON •    Multi-threaded programming •    Experience with algorithms, data structures, and concurrency •    Kafka, Tibco Rendezvous, Tervela, or similar high-speed messaging system •    Experience with distributed database systems like, Cassandra or any other NoSQL database •    Oracle PL/SQL programming, Proficiency in SQL •    Tomcat, WebLogic, or WebSphere •    UNIX / Linux operating systems •    Experience with financial transaction systems •    Basic knowledge of the fixed income and financial markets is a plus. •    Excellent written and verbal communication skills •    Strong ability to interpret business requirements •    Must be a creative problem solver and should have good analytical thinking.

🏢 Summary: Hybrid B2B role in Warsaw for an experienced .NET Developer working on Oracle-based IT systems, focusing on implementation, data analysis, and system development for large-scale environments. The position involves developing web applications, integrating data solutions, and collaborating on business requirements translation into technical solutions. Rate: 100–125 PLN/h net, start ASAP. 🗂️ Requirements: Minimum 3 years of experience in C# and .NET (including 4.5), Experience with WCF, SQL, SSIS, MVC.NET, Experience in web application development, Knowledge of JavaScript, jQuery, jQuery UI, Knowledge of HTML5 and CSS3, Experience with Visual Studio Ultimate 2013, Knowledge of unit testing and test automation, Knowledge of OOP principles and design patterns, Experience in financial sector projects or similar scale systems, Ability to analyze business and system requirements, English proficiency for technical documentation 📃 Skills: C#, .NET, WCF, SQL, SSIS, MVC, HTML, HTML5, CSS3, JavaScript, jQuery, VisualStudio, OOP, Oracle, PLSQL, UML, EnterpriseArchitect, Docker, Kubernetes, ITIL, Agile, XP 🏢 Description: RITS Group to firma informatyczna, która oferuje najwyższej jakości usługi programistyczne zarówno dla rynku polskiego, jak i międzynarodowego. Jesteśmy dumni, że należymy do grona najszybciej rozwijających się spółek technologicznych. Naszym priorytetem jest jakość oraz innowacyjność dostarczanych rozwiązań, a nasza kultura organizacyjna opiera się na zaufaniu, współpracy i ciągłym doskonaleniu. Oferujemy 📍 Lokalizacja: Warszawa (biuro) 🏢 Tryb pracy: Hybrydowy – ok. 2x w miesiącu w biurze (szczegóły do ustalenia z klientem) 📅 Start: ASAP (z uwzględnieniem maks. 1-miesięcznego okresu wypowiedzenia) 📅 Stawka: 100-125 zł netto na godzinę na B2B Obowiązki Prowadzenie prac projektowych i implementacyjnych w systemach IT opartych o technologie Oracle Współpraca z użytkownikami biznesowymi przy zbieraniu i analizie wymagań dotyczących danych Uszczegóławianie koncepcji biznesowych oraz przekładanie ich na rozwiązania systemowe Udział w testach wewnętrznych oprogramowania Tworzenie i aktualizacja dokumentacji technicznej oraz funkcjonalnej Współpraca przy opracowywaniu nowych rozwiązań i kierunków rozwoju systemów Działania poprawiające jakość danych w systemach i aplikacjach eksportujących dane do hurtowni Wsparcie w opiniowaniu dokumentacji technicznej i projektowej przygotowanej przez dostawców zewnętrznych Wymagania Min. 3 lata doświadczenia w programowaniu w technologiach: C#, .NET (w tym 4.5), WCF, SQL, SSIS, MVC.NET , HTML Znajomość: JavaScript, jQuery, jQuery UI, HTML5, CSS3 Doświadczenie z Visual Studio Ultimate 2013 Znajomość testów jednostkowych i automatyzacji testów Doświadczenie w tworzeniu aplikacji webowych Znajomość wzorców projektowych i zasad OOP Doświadczenie w projektach dla instytucji finansowych lub o podobnej skali i złożoności Umiejętność analizy wymagań biznesowych i systemowych Wysoka samodzielność, dobra organizacja pracy, umiejętność pracy zespołowej Bardzo dobre umiejętności komunikacyjne i współpraca z interesariuszami Znajomość języka angielskiego (praca z dokumentacją techniczną) ⭐ Mile widziane Podstawy UX design Znajomość metodyk Agile / XP PL/SQL oraz baza danych Oracle Narzędzia CASE (np. Enterprise Architect) i UML Doświadczenie w strukturach macierzowych Znajomość ITIL Docker, Kubernetes Ta rola nie jest dla Ciebie, ale masz znajomego, który by się sprawdził? Poleć go i zgarnij nawet 5000 zł. Referral Program: Talent from your network Nie zwlekaj i zaaplikuj już teraz! Nr ref.: 23/4/2026/r/3360

🏢 Summary: Long-term B2B opportunity for a Senior Java Developer to modernize and develop a large-scale CRM platform, focusing on migrating a legacy JBoss monolith to a Spring Boot-based domain-driven architecture. The role involves backend development, system modernization, database migration, and collaboration within cross-functional teams. Work is delivered in a hybrid model within an established development department. 🗂️ Requirements: Commercial experience with Java 21+, Experience with REST API development, Strong knowledge of Spring and Spring Boot, Experience with unit and integration testing (Mockito, Testcontainers, JUnit 5), Proficiency with Git, Experience using Swagger, Ability to work with IntelliJ, Experience with JBoss or JEE5, Knowledge of SQL (Postgres or Sybase), English level B2/C1 📃 Skills: Java, REST, Spring, SpringBoot, JUnit, Mockito, Testcontainers, Git, Swagger, IntelliJ, JBoss, JEE, SQL, Postgres, Sybase, React, Kubernetes, Jenkins, JBPM, Swing, JavaFX 🏢 Description: Client: A leading German telecommunications and IT corporation Start date: ASAP Locations: Warszawa, Poznań, Lublin Work model: hybrid with 3 days/week from the office Engagement: Long-term Form of cooperation: B2B, full-time Working hours: Standard business hours About our client: A leading German telecommunications and IT corporation, recognized for innovative solutions in cloud computing, web hosting, and internet services, is expanding its European Technology Center in Poland. The company is building strong development teams in Warsaw, Poznan, and Lublin to support its long-term digital transformation initiatives. About the project & team: You will join an established development team consisting of three experienced Java developers and one test manager. This team is part of a larger department that includes over 20 developers across several cross‑functional teams. The department is responsible for the company’s core CRM platform, which includes multiple frontends (Java Swing, JavaFX, React) and numerous backend services built in technologies such as JBoss 4/7, WildFly 10, Spring Boot, and Spring Batch. The primary focus of your future team is the modernization of the CRM system, including the migration of business logic from a legacy monolithic JBoss 4 application to a modern, domain‑driven architecture using Spring Boot. Future development includes building new React-based frontends, enhancing backend services, and modernizing database layers (e.g., Sybase migrations). You will work within a stable, collaborative setup, contributing to high-impact solutions used across the organization. Must‑have skills: Java >21 REST Spring / Spring Boot Unit- and Integrations-Tests (Mockito, Testcontainers, JUnit 5) Git Swagger IntelliJ Nice to have skills: Kubernetes JEE5 (JBOSS) SQL (Optimal: Postgres, Sybase) Java Swing or JavaFX JBPM Jenkins (CI/CD) English Level: B2/C1 Responsibilities: Develop and maintain backend services within a large CRM platform. Migrate business logic from a monolithic JBoss 4 system to Spring Boot microservices. Participate in building new frontends (React) and extending backend functionalities. Contribute to database modernization, including migration of Sybase logic. Collaborate closely with developers and the team’s test manager. Ensure high code quality through unit and integration testing. Use best practices in CI/CD, version control, and modern development standards. What We Offer: Competitive compensation: up to 120 PLN/h netto on a B2B contract Flexible settlements: Payments issued in your preferred form Fast invoicing: Short 14‑day payment terms Comprehensive healthcare: Extended private medical care package My Benefit platform: Access to a cafeteria system including Multisport cards and prepaid vouchers (e.g., IKEA, Zalando, Notino, and more)

🏢 Summary: Remote Senior .NET Engineer role focused on developing and modernizing advanced, high-performance and scalable web applications within a long-term project. The position involves working with legacy systems, improving architecture, and implementing CI/CD and testing practices. The role requires strong experience in enterprise-level .NET environments and distributed systems. 🗂️ Requirements: Minimum 8 years experience with .NET web applications, Experience with MS SQL and stored procedures, Knowledge of scalable architecture and inter-service communication, Knowledge of design patterns, Experience with legacy code (.NET 6, MVC, VB.NET, Web Forms), Experience with Windows Server and IIS, Experience in legacy system modernization (refactoring, migrations), Ability to use AI tools in programming, Experience with unit and integration testing frameworks, Experience with CI/CD automation, English proficiency for international communication 📃 Skills: .NET, C#, MS SQL, SQL, MVC, VB.NET, WebForms, WindowsServer, IIS, CI/CD, Azure, Docker, Kubernetes, React, PowerBI, Dynamics365, ActiveDirectory, Outlook, NoSQL, AI 🏢 Description: Kim jesteśmy? Jesteśmy firmą programistyczną specjalizującą się w tworzeniu aplikacji webowych i mobilnych. W czternaście lat urośliśmy do blisko 350 współpracowników. Pracujemy dla klientów z całego świata - z USA, UK, Niemiec, Holandii, Skandynawii i innych. Aktualnie poszukujemy inżynierów, którzy byliby zainteresowani wsparciem jednego z naszych projektów (rekrutacja pod projekt). Wynagrodzenie: B2B : 17 000 - 26 000 zł + VAT Miejsce pracy: praca 100% zdalna, bez konieczności pojawiania się w biurze! Jeśli jednak chcesz pracować z biura, mamy dwie opcje - Warszawa, ul. Twarda 18 oraz Gliwice, ul. Dolnych Wałów 8 Od Ciebie oczekujemy: co najmniej 8 lat doświadczenia w budowaniu zaawansowanych, wydajnych i skalowalnych aplikacji internetowych w technologii .NET ogarnięcia baz danych (MS SQL, procedury składowane) znajomość rozwiązań architektonicznych w budowaniu wydajnych i skalowalnych aplikacji (komunikacja między serwisami, kolejki) znajomości najpopularniejszych wzorców projektowych doświadczenie w pracy z legacy code (.NET 6, MVC, VB.NET , Web Forms) doświadczenie w pracy z  Windows Server i IIS doświadczenie w modernizacji legacy systemów (refaktoryzacja, migracje) umiejętności sprawnego wykorzystywania AI w programowaniu umiejętności pisania testów jednostkowych oraz integracyjnych w jednym z popularnych frameworków oraz znajomości automatyzacji procesów (CI/CD) dobrej znajomości języka angielskiego umożliwiającej swobodną komunikację w zespole międzynarodowym - warunek konieczny Mile widziane będzie: doświadczenie w pracy z React.js znajomość MS Dynamics 365, MS Active Directory, powerBI lub integracji z Outlookiem znajomości nierelacyjnych baz danych biegłość w pracy z Dockerem i Kubernetes doświadczenia w pracy chmurą, a w szczególności Microsoft Azure