Fullstack Engineer (.Net, Node.js, React)

🏢 Summary: Senior Full Stack Engineer role focused on building and optimizing React/TypeScript frontends and ASP.NET Core backend services supporting treasury workflows. The position involves designing scalable REST APIs, improving performance across the stack, and working with large datasets in production systems. Hybrid work model in Warsaw with strong emphasis on engineering best practices and reliability. 🗂️ Requirements: 5+ years of experience building production systems, Strong experience with C# and .NET ecosystem, Strong experience with ASP.NET Core, Strong experience with React, Strong experience with TypeScript, Experience designing and building REST APIs, Experience handling large datasets efficiently, Hands-on experience with ag-Grid, Highcharts or similar libraries, Understanding of authentication and authorization mechanisms, Experience with relational databases, Experience with performance optimization 📃 Skills: C#, .NET, ASP.NETCore, React, TypeScript, REST, ag-Grid, Highcharts, SQL, CI/CD, Authentication, Authorization, Serialization 🏢 Description: Senior Full Stack Engineer (.NET / React) Warsaw, hybrid, 3 days per week from the office. Responsibilities Build and enhance frontend applications and backend services supporting treasury workflows. Develop React/TypeScript single‑page applications and reusable UI components. Design and implement ASP.NET Core REST APIs with scalable pagination and filtering models. Optimize performance across the stack, including APIs, serialization, rendering, and large data grids. Collaborate with business stakeholders, quant teams, and product managers to deliver user‑focused solutions. Drive engineering best practices including code reviews, testing, CI/CD, and production support. Investigate production issues and improve observability and platform reliability. Mentor engineers and contribute to technical growth within the Warsaw team. Requirements 5+ years of software engineering experience building production systems. Strong experience with C#/.NET ecosystem and ASP.NET Core . Strong frontend experience with React and TypeScript. Experience building REST APIs and handling large datasets efficiently. Hands‑on experience with ag‑Grid, Highcharts, or similar UI/data visualization libraries. Strong understanding of authentication, authorization, and serialization mechanisms. Experience working with relational databases and performance optimization. Strong communication skills and ability to work directly with business stakeholders. Nice to Have Experience in treasury, trading, or financial systems. Strong product mindset and UX awareness.

🏢 Summary: Full-Stack Developer role focused on building and maintaining scalable server-side applications and responsive front-end interfaces using modern technologies. The position involves working with cloud and containerized environments, optimizing SQL Server databases, and contributing to architectural decisions. The role requires close collaboration with cross-functional teams to deliver high-quality software solutions. 🗂️ Requirements: 6+ years of full-stack application development experience, Proficiency in React, Proficiency in C#, Proficiency in ASP.NET, Proficiency in SQL, Experience with SQL Server and T-SQL, Ability to design and maintain server-side applications, Ability to develop responsive front-end interfaces 📃 Skills: C#, ASP.NET, .NET, React, AngularJS, Node.js, SQL, SQLServer, T-SQL, Cloud, Containers, Streaming 🏢 Description: Full-Stack Developer What you’ll do Design, develop, and maintain server-side applications using modern technologies such as C#/.NET and Node.js. Create and enhance responsive front-end interfaces with ReactJS and AngularJS. Optimize and manage SQL Server databases, writing efficient T-SQL procedures. Utilize cloud, containerization, and streaming technologies to build scalable and reliable systems. Contribute to architectural discussions and technical design decisions. Work closely with cross-functional teams to deliver high-quality software solutions. What’s required 6+ years of experience in full-stack application development. Proficiency in React, C#, ASP.NET , and SQL. Strong analytical and problem-solving skills with a focus on delivering robust solutions. Excellent attention to detail and commitment to quality. Effective communication and teamwork skills. High ethical standards and professionalism. Nice to have Experience with Node.js.

🏢 Summary: The role involves developing and maintaining scalable full-stack web applications using .NET and modern frontend frameworks. You will design robust Web APIs, optimize databases, and implement clean, testable code within CI/CD-driven environments. The position requires active participation in the full software development lifecycle for international projects. 🗂️ Requirements: Minimum 3 years commercial experience with .NET (C#, Web API, Entity Framework), Proficiency in Angular or React, Strong knowledge of JavaScript, HTML, CSS, Experience with SQL Server or PostgreSQL, Understanding of Unit Testing, Experience with Git, Experience with CI/CD pipelines, Knowledge of design patterns, Knowledge of software development best practices, Fluent English (min. B2), Availability for hybrid work mode 📃 Skills: .NET, C#, WebAPI, EntityFramework, Angular, React, JavaScript, HTML, CSS, SQL, SQLServer, PostgreSQL, UnitTesting, Git, CI/CD 🏢 Description: As a member of our development team, you will be responsible for building scalable web applications, designing robust APIs, and creating intuitive user interfaces. We value clean code, analytical thinking, and a proactive approach to technology. Our expectations: Minimum 3 years of commercial experience in .NET (C#, Web API, Entity Framework). Proficiency in Angular or React, along with JavaScript, HTML, CSS, and modern frontend libraries. Strong experience with relational databases such as SQL Server or PostgreSQL. Solid understanding of Unit Testing, Git, and CI/CD pipelines. Practical knowledge of design patterns and software development best practices. A collaborative mindset and the ability to explain complex technical issues clearly. Strong analytical skills and a "get it done" attitude. Fluent English (min. B2) for smooth collaboration with international partners. Open to work in hybrid mode. Main responsibilities: You will design, develop, and maintain scalable full-stack applications using .NET and modern frontend frameworks (Angular/React) for diverse client projects. You will be responsible for writing clean, testable code and implementing unit tests to ensure the highest software performance and reliability. You will work closely with cross-functional teams to architect robust Web APIs and optimize database schemas while following industry best practices and design patterns. You will actively participate in the full software development life cycle, including CI/CD processes and version control management, to ensure seamless project delivery.

🏢 Summary: Long-term remote Full-Stack Developer role for a UK banking client within a global enterprise environment. The position involves building and maintaining .NET and React applications, integrating REST APIs, and working with SQL Server in a regulated financial services setting. Offers exposure to enterprise-scale banking solutions with a B2B contract and remote work from Poland. 🗂️ Requirements: 3+ years of full-stack development experience, Proficiency in C#, Experience with ASP.NET Core, Experience with .NET Web API, Experience with React, Knowledge of HTML5, Knowledge of CSS3, Knowledge of JavaScript, Knowledge of TypeScript, Experience with RESTful APIs, Experience with SQL Server, Knowledge of stored procedures, functions, and views, Experience with Entity Framework, Understanding of design patterns, Knowledge of database normalization, Experience with Azure DevOps, Knowledge of CI/CD, Understanding of application security, performance, and scalability, Bachelor's degree in Computer Science or related field 📃 Skills: C#, ASP.NET, .NET, React, HTML5, CSS3, JavaScript, TypeScript, REST, SQL, SQLServer, EntityFramework, AzureDevOps, CI/CD, Azure, SFTP 🏢 Description: We are looking for an experienced Full-Stack Developer to join a long-term project for one of the world's leading professional services organizations. You will work within a global technology team delivering solutions for a UK-based banking client in a regulated, enterprise-scale environment. Location: 100% Remote (Poland) with occasional visits to Warsaw office Client: Global professional services firm, banking & financial services sector, UK Requirements - 3+ years of experience in full-stack development - Proficiency in C#, ASP.NET Core, .NET Web API - Experience with React, including state management and component architecture - Knowledge of HTML5, CSS3, JavaScript, and TypeScript - Experience with RESTful API design and integration - Experience with SQL Server, including queries, stored procedures, functions, and views - Experience with Entity Framework - Understanding of design patterns and database normalization - Experience with Azure DevOps for source control and CI/CD - Understanding of application security, performance, and scalability best practices - Bachelor's degree in Computer Science or related field Nice to Have - Azure Cloud Services and cloud-native architecture - SFTP and encryption/secure file transfer protocols - Experience with vendor software integration and custom interfaces Responsibilities - Design, develop, and maintain web applications using .NET (C#, ASP.NET Core) and React - Build responsive user interfaces with HTML, CSS, JavaScript, and React - Develop and consume RESTful APIs to connect client-side and server-side components - Implement and optimize data storage using SQL Server - Perform coding, debugging, testing, and troubleshooting throughout the development lifecycle - Maintain and enhance existing systems, fixing complex bugs and escalating risks where needed - Capture detailed requirements from stakeholders and translate them into technical specifications - Ensure adherence to coding standards, design patterns, and security best practices - Collaborate with vendor teams and third-party integrations - Monitor emerging technologies and contribute ideas for continuous improvement We Offer - 100% remote work from Poland - Occasional team meetups in Warsaw - Long-term project with a prestigious international client - Exposure to enterprise-scale banking solutions - B2B Contract - Private medical care (Luxmed) - MultiSport sports card

🏢 Summary: Full-Stack Developer role on a long-term, enterprise-scale banking project, delivering web solutions using .NET and React in a regulated environment. The position involves end-to-end development, API integration, and database optimization within a global technology team. Work is fully remote from Poland with collaboration on complex financial systems. 🗂️ Requirements: 3+ years of full-stack development experience, Proficiency in C# and ASP.NET Core, Experience with .NET Web API, Strong knowledge of React including state management and component architecture, Experience with HTML5, CSS3, JavaScript or TypeScript, Experience designing and integrating RESTful APIs, Strong SQL Server skills including queries and stored procedures, Experience with Entity Framework, Knowledge of design patterns and database normalization, Experience with Azure DevOps for source control and CI/CD, Understanding of application security, performance, and scalability best practices, Bachelor's degree in Computer Science or related field 📃 Skills: C#, .NET, ASP.NETCore, WebAPI, React, HTML5, CSS3, JavaScript, TypeScript, REST, SQL, SQLServer, EntityFramework, AzureDevOps 🏢 Description: We are looking for an experienced Full-Stack Developer to join a long-term project for one of the world's leading professional services organizations. You will work within a global technology team delivering solutions for a UK-based banking client in a regulated, enterprise-scale environment. Location: 100% Remote (Poland) with occasional visits to Warsaw office Client: Global professional services firm, banking & financial services sector, UK Requirements 3+ years of experience in full-stack development, with proficiency in most of the following: C#, ASP.NET Core, .NET Web API React — state management, component architecture HTML5, CSS3, JavaScript / TypeScript RESTful API design and integration SQL Server — queries, stored procedures, functions, views Entity Framework Design patterns and database normalization Azure DevOps for source control and CI/CD Application security, performance, and scalability best practices Bachelor's degree in Computer Science or related field Nice to Have Azure Cloud Services and cloud-native architecture SFTP and encryption/secure file transfer protocols Experience with vendor software integration and custom interfaces Responsibilities Design, develop, and maintain web applications using .NET (C#, ASP.NET Core) and React Build responsive user interfaces with HTML, CSS, JavaScript, and React Develop and consume RESTful APIs to connect client-side and server-side components Implement and optimize data storage using SQL Server (stored procedures, functions, views) Perform coding, debugging, testing, and troubleshooting throughout the development lifecycle Maintain and enhance existing systems, fixing complex bugs and escalating risks where needed Capture detailed requirements from stakeholders and translate them into technical specifications Ensure adherence to coding standards, design patterns, and security best practices Collaborate with vendor teams and third-party integrations Monitor emerging technologies and contribute ideas for continuous improvement We Offer 100% remote work from Poland Occasional team meetups in Warsaw Long-term project with a prestigious international client Exposure to enterprise-scale banking solutions B2B Contract Private medical care ( Luxmed ) MultiSport sports card

🏢 Summary: Senior Full-Stack Developer role focused on enhancing a platform using React and TypeScript on the frontend and .NET/C# with SQL Server on the backend. The position emphasizes strong frontend expertise while maintaining sufficient backend knowledge for independent task execution. Experience with legacy systems is considered an advantage. 🗂️ Requirements: 5+ years full-stack development experience (Mid) or 10+ years (Senior), Proficiency in React, Proficiency in TypeScript, Strong knowledge of modern JavaScript, Solid knowledge of C# and .NET, Ability to work with SQL Server 📃 Skills: React, TypeScript, JavaScript, C#, .NET, SQL, SQLServer, ClassicASP 🏢 Description: Summary: A senior full-stack developer position focused on enhancing our platform through modern technologies, primarily using React and TypeScript on the frontend and .NET/C# with SQL Server on the backend. Main Responsibilities: Strengthen the focus on React and TypeScript as the primary and most critical skills, with a solid foundation in modern JavaScript. Utilize .NET/C# and SQL Server as supporting skills to ensure self-sufficiency in day-to-day tasks without primary responsibility for complex backend or database optimization. Leverage knowledge of legacy technologies, such as Classic ASP, for understanding existing logic as a nice-to-have skill. Key Requirements: At least 5 years of experience (Mid-level) or 10 years (Senior-level) in full-stack development. Proficiency in React and TypeScript. Solid foundation in modern JavaScript and C# / .NET. Nice to Have: Experience with legacy systems like Classic ASP.

🏢 Summary: Senior Full-Stack Engineer role with a 50/50 backend and frontend focus, building scalable microservices-based applications using ASP.NET (C#) and React with TypeScript in a cloud-native environment. The position involves designing and maintaining REST APIs, developing responsive user interfaces, ensuring high test coverage, and contributing to architectural decisions with strong technical ownership. Poland-based employment (Umowa o Pracę) with remote flexibility and quarterly in-person collaboration. 🗂️ Requirements: MSc+ in Computer Science or equivalent, Minimum 5 years experience with ASP.NET and C#, Minimum 5 years experience building REST APIs, Minimum 5 years experience with React, Experience with TypeScript, Strong knowledge of microservices architecture, Knowledge of cloud design patterns, Experience with unit, integration, and end-to-end testing, High level of technical ownership, Fluent English (minimum B2), Poland residency 📃 Skills: ASP.NET, C#, REST, React, TypeScript, Microservices, AWS, Agile, DDD, UnitTesting, IntegrationTesting, E2ETesting, Cloud 🏢 Description: We’re looking for a Senior Full-Stack Engineer who brings deep technical expertise and a collaborative mindset to our product development team. You will work with a modern microservices architecture, building scalable backend services using the ASP.NET Web API with C#, and intuitive frontend interfaces using mainly React and TypeScript. This is a hands-on engineering role with a 50/50 front-/backend focus, ideal for someone who likes to take ownership, thrives in a dynamic product team, and enjoys mentoring others. This role could easily become a Tech Lead role in a foreseeable future. If you're passionate about designing high-impact software in a cloud-native environment, we’d love to hear from you. This Poland-based role offers remote flexibility, but we value in-person collaboration. Our team meets in Poland for at least one week each quarter, so we request all applicants to be located in Poland. This is not a globally remote role. Poland residency is required. The contract form is Umowa o Pracę (only, no B2B). What you will be responsible for Collaborate proactively in refinement sessions with product and tech teams to ensure clarity and feasibility of features. Design, implement, and maintain scalable web APIs using ASP.NET and microservices architecture principles. Develop responsive user interfaces with React and TypeScript that enhance usability and performance. Work closely with Product Owners to clarify feature requirements and ensure business context is well-understood. Define, design and align feature architecture with the Head of Engineering to ensure consistency and scalability. Ensure features meet Definition of Done, with state-of-the-art unit, integration, and end-to-end test coverage. Support incident response and production issue resolution as per team standards. Actively contribute to team knowledge sharing and coach colleagues in technical best practices. What makes you a match Essential Qualifications: MSc+ in Computer Science or equivalent 5 years of proven experience in building secure REST APIs using ASP.NET , as well as developing solid front-end applications with React are non-negotiable must haves. Comprehensive knowledge of contemporary web application architectures, with a focus on microservices and cloud design patterns. Demonstrated ability of high technical Ownership and Tech Leadership are a requirement for this role. Bonus Skills: Hands-on experience with AWS infrastructure. Experience working in cross-functional product teams using Agile practices and following Domain-Driven Design (DDD). Collaboration and Interpersonal Skills: Clear and adaptive communication with both technical and non-technical stakeholders. Strong sense of ownership, accountability, and proactive problem-solving. Languages: English: B2 - (No certificate required, but Fluency) German, Polish, Ukrainian: desired, not required What you can expect A dynamic, ambitious team where your voice is heard, and your contributions truly matter. You’ll have real ownership over your decisions in a trusted, cross-functional environment within a Swiss product company that puts people first. We offer fair compensation, flexible working hours, a hybrid work setup, and a culture that supports both personal and professional growth, fostering a healthy work-life balance. Employer of Record: For this role, we offer employment through our trusted Employer of Record provider Remote.com , ensuring full legal compliance and a seamless experience for our team members in Poland. ID Verification: To maintain a fair and secure hiring process, candidates may be asked to verify their identity their identity before speaking with our Recruiter. This step helps us prevent fraud and focus our resources on genuine applicants. About us Who we are esurance is a Swiss InsurTech offering a SaaS platform that connects SMEs, insurance providers, brokers, and business application providers. Founded in 2013, we're on a mission to make health insurance for small businesses truly hassle-free. What makes us unique You'll be part of a connected, forward-thinking team built on trust, openness, and mutual respect — working hybrid from Zürich or remotely across Europe. We invest in your growth through agile practices, real ownership, and a transparent Grading System that ensures fair pay and clear career paths. Our core values We are connected. We are ahead. We are clear. We are approachable. Do these resonate with you? → Come join us. Our Recruitment Process & Principles We keep our process transparent and respect your time: Application Review — You hear from us within 5 business days. Always. Recruiter Screen — A relaxed Get2Know call to explore mutual fit. Four Interviews — Two Role Knowledge interviews (peer + supervisor), one Culture Match, one Leadership conversation. Batched into two days wherever possible. Hiring Decision — Thoughtful, timely. You'll know within 1–2 weeks. Use of Artificial Intelligence (AI) We use AI to increase productivity and you're welcome to use it to polish your CV or Coverletter. Interviews and assessments should reflect your genuine self, though. Recruiting Agencies: We don't work with unsolicited agency submissions. Thanks for respecting this.

🏢 Summary: Fullstack Developer role focused on building scalable web applications using ASP.NET, C#, and React, with strong emphasis on API design, event-driven architecture, and cloud-native environments. The position involves end-to-end development, CI/CD practices, containerized deployments, and collaboration in agile teams. Ideal for engineers experienced in backend services, modern frontend ecosystems, and orchestration tools. 🗂️ Requirements: Strong experience with ASP.NET, Strong experience with C#, Experience building scalable backend services and APIs, Strong experience with React, Understanding of modern frontend architecture, Experience with API design, Experience with GitLab CI/CD, Experience with RabbitMQ, Experience with Docker, Experience with Kubernetes 📃 Skills: ASP.NET, C#, React, TanStack, Tailwind, Playwright, RabbitMQ, Docker, Kubernetes, GitLab, Linux, Unity, APIs, CI/CD 🏢 Description: Role Overview We are looking for a skilled Fullstack Developer with strong backend expertise in ASP.NET and C#, combined with modern frontend development using React. The role involves building scalable web applications, designing robust APIs, and contributing to cloud-native and event-driven architectures. The ideal candidate is comfortable working across the full stack, collaborates well in agile teams, and has an interest in modern tooling, orchestration, and frontend ecosystems. Core Responsibilities • Design, develop, and maintain scalable fullstack applications • Build and maintain backend services using ASP.NET and C# • Develop responsive and modern frontend applications using React • Design and integrate APIs and asynchronous communication flows • Collaborate with developers, designers, QA, and DevOps teams • Contribute to architecture discussions and technical decisions • Ensure code quality through testing, reviews, and CI/CD practices • Participate in deployment, monitoring, and troubleshooting activities Must-Have Skills Backend • Strong experience with ASP.NET • Strong experience with C# • Experience building scalable backend services and APIs Frontend • Strong experience with React • Good understanding of modern frontend architecture and component-based development Should-Have Skills • Experience with GitLab Pipelines / CI-CD • Experience with API design and best practices Frontend Libraries & Tooling • Experience with: o TanStack o Tailwind CSS o Playwright o AI agent development (Kiro, Claude, Cursor) Messaging & Async Communication • Experience with: o RabbitMQ o Event-driven and asynchronous communication patterns • Understanding of async workflows across frontend and backend systems Infrastructure & Orchestration • Experience with: o Docker o Kubernetes • Familiarity with containerized deployments and orchestration Nice-to-Have Skills • Interest or experience in Unity / game development • Strong Linux competence Preferred Qualifications • Experience working in agile development environments • Strong problem-solving and debugging skills • Understanding of scalable and maintainable software architecture • Good communication and collaboration skills • Passion for learning modern technologies and frameworks Tech Stack Summary Area Backend: ASP.NET, C# Frontend: React Frontend Libraries: TanStack, Tailwind, Playwright Messaging: RabbitMQ Infrastructure: Docker, Kubernetes CI/CD: GitLab Pipelines Additional: Linux, API Design, Unity

🏢 Summary: Full Stack Developer role combining frontend and backend development with strong DevOps and CI/CD responsibilities. The position involves building scalable web applications, managing cloud infrastructure, and automating testing and deployment pipelines. You will work across the stack to ensure reliable, high-performance systems. 🗂️ Requirements: Proven experience as Full Stack Developer, Proficiency in Angular or React, Backend development experience with Node.js, Java, Python, or .NET, Hands-on experience with CI/CD tools, Experience with Docker, Familiarity with AWS, Azure, or GCP, Strong knowledge of Git, Experience in Agile/Scrum environments 📃 Skills: Angular, React, Node.js, Java, Python, .NET, CI/CD, Jenkins, GitHub, GitLab, Docker, Kubernetes, AWS, Azure, GCP, Git, Terraform, CloudFormation, Prometheus, Grafana, ELK 🏢 Description: We are looking for a skilled Full Stack Developers with strong DevOps and CI/CD experience to join our growing team in Warsaw. This role is ideal for someone who enjoys working across the entire stack while also contributing to infrastructure, automation, and deployment pipelines. You will play a key role in building scalable applications, improving development workflows, and ensuring smooth, reliable deployments. Key Responsibilities Design, develop, and maintain full stack web applications Build modern frontend applications using Angular or React Develop and integrate RESTful APIs and backend services Implement and manage CI/CD pipelines for automated testing and deployment Collaborate with cross-functional teams including product, QA, and design Optimize applications for performance, scalability, and security Manage cloud infrastructure and deployment environments Monitor systems and troubleshoot production issues Required Skills & Experience Proven experience as a Full Stack Developer Strong proficiency in Angular or React Solid backend development experience (e.g., Node.js, Java, Python, or .NET) Hands-on experience with CI/CD tools (e.g., Jenkins, GitHub Actions, GitLab CI) Experience with containerization (Docker) and orchestration (Kubernetes is a plus) Familiarity with cloud platforms (AWS, Azure, or GCP) Strong understanding of version control systems (Git) Experience working in Agile/Scrum environments Nice to Have Infrastructure as Code (Terraform, CloudFormation) Experience with microservices architecture Knowledge of monitoring and logging tools (Prometheus, Grafana, ELK stack) What We Offer Hybrid work model (2 days onsite in Warsaw, flexible remote work) Competitive salary and benefits package Opportunity to work with modern technologies and cloud platforms Collaborative and innovative team environment Professional growth and development opportunities How to Apply If you are passionate about full stack development and DevOps practices, we’d love to hear from you. Please submit your CV along with a brief summary of your experience.

🏢 Summary: Hybrid Senior Fullstack Developer role focused on building and maintaining large-scale, event-driven microservices systems using modern Java and Spring Boot alongside Angular-based SPAs. The position involves end-to-end development, security implementation, and active participation in CI/CD and Agile processes. Requires strong hands-on experience across backend and frontend technologies in distributed environments. 🗂️ Requirements: Minimum 6 years professional software development experience, Senior-level hands-on experience with large-scale applications, Strong fullstack experience (backend and frontend), Java 17+ (Java 21 preferred), Spring Boot 3.x and microservices architecture, Experience with Kafka and event-driven systems, Experience with Node.js and TypeScript, Proven experience building SPAs with Angular, Strong SQL skills with Oracle, Experience with OAuth2 and OIDC, Understanding of OWASP web security principles, Experience with Git version control, Experience with GitLab CI, Ability to work in Agile (Scrum/Kanban) environments, Professional English proficiency 📃 Skills: Java, Spring, SpringBoot, Microservices, Kafka, Node.js, TypeScript, Angular, SQL, Oracle, OAuth2, OIDC, OWASP, Git, GitLab, CI/CD, DDD, Redis, Docker, Kubernetes, Jenkins, Maven, Webpack, Python, Jira, Confluence 🏢 Description: Senior Fullstack Developer . This is a hybrid position based in Warsaw , (50% on-site presence). Responsibilities Design, implement and maintain backend services using modern Java (versions 17–21) and Spring Boot 3.x within microservices architectures. Develop and maintain frontend components and Single Page Applications using Node.js, TypeScript and Angular, ensuring maintainability and sound frontend architecture. Architect and implement event-driven and messaging solutions using Kafka; integrate with relational databases (Oracle) and in-memory stores (Redis). Apply Domain-Driven Design principles to model complex business domains and deliver modular, testable solutions. Contribute to security design and implementation of web applications, including OAuth2/OIDC integration and adherence to OWASP principles. Participate in CI/CD pipelines (GitLab CI required), version control workflows (Git), and use developer tools such as IntelliJ and VS Code. Collaborate with distributed, international teams using Agile methodologies (Scrum/Kanban), Jira and Confluence; perform code reviews and provide practical technical guidance to peers. Qualifications Minimum 6 years of professional software development experience, with senior-level, hands-on delivery on large-scale applications. Strong fullstack background; backend-only candidates will not be considered. Excellent written and spoken English. Required technical skills: Java 17 or newer (Java 21 experience preferred) Spring Boot (3.x) and microservices Kafka (event-driven / messaging systems) Domain-Driven Design (DDD) Node.js and TypeScript Proven experience building SPAs with Angular Strong SQL skills, particularly with Oracle Security and tooling: Practical experience with OAuth2 and OIDC; strong understanding of web application security and OWASP principles Version control with Git and CI/CD with GitLab CI (required) Familiarity with Kafka in both backend and operational contexts Working knowledge of Jira and Confluence Desirable (nice to have): Experience with Redis Familiarity with Docker and Kubernetes Experience with Jenkins, Maven and Webpack Python and familiarity with AI-based code generation tools Experience working in distributed, international teams and a DevOps mindset. Benefits Hybrid working arrangement: Warsaw, Poland — approximately 50% on-site presence. Opportunity to work on large-scale systems using modern Java, microservices and event-driven architectures. Collaboration within distributed, international teams and exposure to established Agile and DevOps practices. Use of contemporary developer tooling and platforms (IntelliJ, VS Code, GitLab CI, Kafka, Spring Boot). Scope to apply and deepen expertise in security, DDD and end-to-end fullstack development. Unique TEAL culture, relationship- and respect-driven community, non-corporate atmosphere. Agile approach and no bureaucracy. Outstanding integration trips to various places in Europe for all employees. Activities to support your well-being and health. Luxmed Gold Extended medical care and Multisport Plus benefit. If you meet the stated qualifications and are interested in this opportunity, we encourage you to apply via the application form.