Fullstack Engineer

🏢 Summary: Backend engineering role focused on building and maintaining regulated financial services platforms, primarily in Python with exposure to Go and Rust. The position involves designing cloud infrastructure, integrating external financial systems, and delivering production-ready solutions in a highly regulated fintech environment. Hybrid work model with strong ownership over technical solutions. 🗂️ Requirements: Solid experience with Python, Willingness to work with Go and/or Rust, Experience with cloud platforms, Experience with infrastructure-as-code using Terraform, Understanding of distributed systems concepts, Ability to work autonomously in a team environment, Ability to operate in a regulated environment with high quality standards 📃 Skills: Python, Go, Rust, Terraform, AWS, Azure, DistributedSystems, EventDrivenArchitecture, MessageQueues, CI/CD, Containers 🏢 Description: Tradevest is a BaFin-licensed digital financial infrastructure provider headquartered in Munich, Germany. We deliver banking-as-a-service solutions that enable trading, custody, and management of traditional securities, cryptocurrencies, and tokenized assets — all through a single integrated platform. Our clients include banks, wealth managers, neobrokers, and fintechs across Europe. Our IT development hub is based in Warsaw, where our engineering team meets in the office twice a week. We maintain a hybrid work model because we genuinely believe that in-person collaboration helps us build better products and stronger teams. We're growing rapidly, building serious financial platforms while keeping a relaxed, professional atmosphere where engineers have real ownership over what they build. What you'll do - Develop and maintain backend services powering regulated financial products - Work across multiple projects — from building new and maintaining existing Python-based solutions to building new services in Go or Rust - Design and implement cloud infrastructure using Terraform (AWS, Azure, On-Prem) - Build integrations with external financial services, tackling real-world challenges around asynchronous processing and data synchronization - Take ownership of delivering high-quality, production-ready systems in a highly regulated fintech environment - Leverage AI-assisted development tools thoughtfully — we embrace them but never at the cost of security or quality What we're looking for - Solid experience with Python - Openness and willingness to work with Go and/or Rust — you don't need to be an expert, but curiosity matters - Experience with cloud platforms and infrastructure-as-code (Terraform) - Understanding of distributed systems concepts — event-driven architectures, message queues, eventual consistency - Ability to work autonomously while collaborating with a team - Comfort operating in a regulated environment where quality and reliability are non-negotiable Nice to have - Prior experience in fintech, banking, or other regulated industries - Familiarity with Go or Rust in production environments - Knowledge of CI/CD pipelines and containerized deployments What we offer - Hybrid work model — 2 days/week in our Warsaw office, rest remote - 20 days PTO on B2B - Real impact on financial products used by institutional clients across Europe - Exposure to a modern, polyglot tech stack and cloud-native architecture - A team that values engineering growth — we invest in building competences, not just shipping features - Relaxed yet professional culture in a rapidly growing company - Flex-time arrangements

🏢 Summary: Frontend role focused on building and maintaining web and mobile financial applications using React and React Native. The position involves working with TypeScript, improving existing codebases, and contributing to the full development lifecycle from design to deployment. The role requires strong ownership and autonomous architectural decision-making within a hybrid work model. 🗂️ Requirements: 2–4 years of experience with React, 2–4 years of experience with React Native, Strong knowledge of TypeScript, Experience building and deploying web applications, Experience building and deploying mobile applications, Ability to make architectural decisions independently, Experience working with and improving existing codebases, Understanding of full development lifecycle 📃 Skills: TypeScript, React, ReactNative, JavaScript, HTML, CSS, Android, iOS, Git 🏢 Description: About Tradevest Tradevest is a BaFin-licensed digital financial infrastructure provider headquartered in Munich, Germany. We deliver banking-as-a-service solutions that enable trading, custody, and management of traditional securities, cryptocurrencies, and tokenized assets — all through a single integrated platform. Our clients include banks, wealth managers, neobrokers, and fintechs across Europe. Our IT development hub is based in Warsaw, where our engineering team meets in the office twice a week. We maintain a hybrid work model because we genuinely believe that in-person collaboration helps us build better products and stronger teams. We're growing rapidly, building serious financial platforms while keeping a relaxed, professional atmosphere where engineers have real ownership over what they build. What you'll do - Develop and maintain front-end applications across multiple initiatives — internal web apps, public-facing web platforms, and existing Android/iOS mobile apps - Work using Typescript within a React and React Native stack, delivering polished user experiences for financial products - Make sound architectural decisions autonomously while collaborating with experienced colleagues for validation and feedback - Navigate and improve existing codebases — we need someone who enjoys bringing order to complexity, not just greenfield development - Contribute to the full development lifecycle from feature design through deployment What we're looking for - 2-4 years of experience with a solid, demonstrable understanding of React and React Native - Ability to work autonomously and make informed architectural decisions — this role requires ownership, not hand-holding - Experience building and shipping both web and mobile applications - Comfort working with existing codebases — reading, understanding, and improving code others have written - A problem-solving mindset — you enjoy challenges and aren't discouraged by complexity - Good communication skills for collaborating with the team and consulting on technical direction Nice to have - Familiarity with state management solutions (Redux, Zustand, MobX, or similar) - Knowledge of CI/CD pipelines for web and mobile deployments - Prior experience in fintech or other regulated industries - Experience with app store submission processes (Google Play, App Store) What we offer - Hybrid work model — 2 days/week in our Warsaw office, rest remote - 20 days PTO on B2B - Variety of front-end challenges — internal tools, public platforms, and mobile apps, all within one role - Autonomy with support — make real decisions backed by an experienced team - A team that values engineering growth — we invest in building competences, not just shipping features - Relaxed yet professional culture in a rapidly growing company - Flex-time arrangements

🏢 Summary: QA Engineer role focused on testing and safeguarding fintech platforms covering APIs, web, and mobile applications in a regulated financial environment. The position combines manual and automated testing, building regression suites, and collaborating with stakeholders to ensure high-quality trading and custody workflows. The role also explores AI-assisted testing to improve coverage and efficiency. 🗂️ Requirements: Experience in manual testing of APIs, web applications, and mobile apps, Experience in automated testing and building regression test suites, Ability to design test strategies based on complex business requirements, Understanding of software testing processes in regulated environments, Strong collaboration with developers and business stakeholders, Ability to work in hybrid model (Warsaw office twice a week) 📃 Skills: API, Web, Android, iOS, Selenium, Cypress, Appium, Playwright, Postman, REST, Ginkgo, Gomega, Cucumber, BDD, Automation, Regression, AI 🏢 Description: About Tradevest Tradevest is a BaFin-licensed digital financial infrastructure provider headquartered in Munich, Germany. We deliver banking-as-a-service solutions that enable trading, custody, and management of traditional securities, cryptocurrencies, and tokenized assets — all through a single integrated platform. Our clients include banks, wealth managers, neobrokers, and fintechs across Europe. Our IT development hub is based in Warsaw, where our engineering team meets in the office twice a week. We maintain a hybrid work model because we genuinely believe that in-person collaboration helps us build better products and stronger teams. We're growing rapidly, building serious financial platforms while keeping a relaxed, professional atmosphere where engineers have real ownership over what they build. ## What you'll do - Test multiple platforms across a wide range of technologies — from manual API testing and web app validation to mobile app testing on Android and iOS - Build and maintain automated regression test suites to safeguard critical financial workflows - Explore and implement AI-assisted testing approaches to increase coverage and efficiency - Collaborate closely with business stakeholders on user story refinement and acceptance criteria - Support documentation management and serve as a key point of contact for clients - Bring a detail-oriented, analytical mindset to a highly regulated environment where precision directly impacts trust ## What we're looking for - Experience in manual and automated testing across APIs, web applications, and mobile apps - A meticulous, detail-oriented approach — in fintech, the details matter - Ability to quickly understand complex business domains and translate requirements into thorough test strategies - Strong communication skills — you'll work with developers, business analysts, and external clients - A proactive mindset — our QA engineers are not just testers, they're active participants in shaping the product - Eagerness to learn and adapt — you'll ramp up quickly on trading markets, financial regulations, and platform-specific knowledge ## Nice to have - Prior experience in fintech, banking, or other regulated industries - Understanding of EU trading markets and associated regulations (MiFID II, KYC/AML) - Experience with test automation frameworks (Selenium, Cypress, Appium, Playwright, or similar) - Familiarity with API testing tools (Postman, REST Assured, or similar) - Experience with BDD frameworks (Ginkgo/Gomega, Cucumber, or similar) ## What we offer - Hybrid work model — 2 days/week in our Warsaw office, rest remote - 20 days PTO on B2B - A role that goes beyond testing — real influence on product quality, client relationships, and business processes - Exposure to diverse platforms and technologies in a fast-moving fintech environment - A team that values growth — we invest in building competences and support continuous learning - Relaxed yet professional culture in a rapidly growing company - Flex-time arrangements

🏢 Summary: Senior Fullstack Engineer role in a global investment firm focused on building and modernizing high-performance financial platforms. The position involves end-to-end development across backend and frontend, optimizing financial data systems, and contributing to cloud-based, distributed architectures. The role combines enterprise engineering with modern cloud and streaming technologies in a global, agile environment. 🗂️ Requirements: 7+ years of professional full-stack development experience, Hands-on experience with C# and .NET, Hands-on experience with Node.js, Hands-on experience with React, Strong knowledge of SQL Server and T-SQL, Experience designing scalable server-side applications, Experience optimizing high-throughput databases, Ability to participate in architecture and design reviews, Professional English proficiency 📃 Skills: C#, .NET, Node.js, ReactJS, AngularJS, SQL, T-SQL, SQLServer, Cloud, Containers, DataStreaming, AI, ML 🏢 Description: About the Role & Project We are recruiting for a leading global alternative investment firm (Hedge Fund) that is modernizing capital markets. We are not looking for a traditional, single-stack developer. We need a Senior Fullstack Engineer who comfortably bridges the gap between robust enterprise systems and cutting-edge cloud/AI solutions. You will join an agile tech team building high-performance platforms where your code directly impacts complex, global financial systems. Tech Stack Backend: C# / .NET, Node.js Frontend: ReactJS (with occasional legacy AngularJS maintenance) Data: SQL Server, T-SQL Architecture: Cloud, Containers, Data Streaming Key Responsibilities End-to-End Dev: Design and scale server-side apps (Node.js/.NET) and build responsive UIs (React). Data & Perf: Optimize high-throughput SQL Server stored procedures for financial data. Modernization: Leverage streaming and cloud technologies to build resilient, distributed platforms. Architecture: Take an active role in tech design reviews, architecture discussions, and mentoring. Requirements 7+ years of professional full-stack development experience. Hands-on mastery of C#/.NET, Node.js, React, and T-SQL. Engineering standards: Strong analytical skills, clean code mindset, and solid application design focus. Communication: Excellent English skills to collaborate smoothly with international teams. Bonus Points: Experience or interest in integrating AI/ML models into enterprise apps. Prior background in FinTech, banking, or trading environments . What We Offer Financial & Future: Private pension scheme, life & travel insurance, educational assistance reimbursement. Health & Wellness: Premium medical & dental package (with vision allowance) + MultiSport card. Culture & Perks: Pre-funded lunch card, Employee Assistance Program, volunteer opportunities, and active DEI affinity groups. If interested, please click apply! :)

🏢 Summary: Full Stack Developer role focused on building scalable, cloud-native applications using React and C# .NET Core in a capital markets environment. The position involves developing microservices, REST APIs, data pipelines, and analytical solutions supporting credit and market risk domains. 100% remote B2B contract with flexible start date. 🗂️ Requirements: 4-5+ years of full stack development experience, Strong expertise in React, Strong expertise in C#, Experience with .NET Core, Experience with microservices architecture, Experience with event-driven architecture, Experience with distributed systems, Experience building REST APIs, Hands-on experience with Python, Experience with PySpark, Experience with Power BI, Experience with data modeling, Experience in credit risk and market risk domains 📃 Skills: React, C#, .NETCore, Microservices, REST, TypeScript, Python, PySpark, PowerBI, DataModeling, DistributedSystems, EventDriven, Cloud 🏢 Description: Start Date: ASAP / Within 1 Month / Flexible Work Model: 100% remote Contract Type: B2B (140-160 PLN/h + VAT) We are looking for a highly skilled Full Stack Developer with deep expertise in React for frontend development and C# .NET Core for backend services. This role requires hands‑on experience building scalable, cloud‑native systems, along with strong exposure to capital markets, especially within credit risk and market risk domains. Expectations Minimum 4-5 years of professional software development experience across frontend and backend technologies. Strong expertise in React, C# .NET Core , microservices, event‑driven architecture, and distributed systems. Hands‑on experience with Python (pyspark), Power BI dashboards, data modeling, and analytical reporting. Responsibilities Develop and maintain full stack applications using React, C# .NET Core, and modern cloud‑native technologies. Build scalable backend services, REST APIs, and microservices with a focus on performance and resilience. Implement modular, accessible, and high‑quality frontend components using React and TypeScript. Collaborate with business and risk experts to deliver solutions in credit risk, market risk, and capital markets workflows. Work with Python (pyspark) to build data pipelines, transformations, and analytics processes. What We Offer Medicover healthcare package Multisport card Access to an e-learning platform Group life insurance

🏢 Summary: Remote Fullstack Developer role focused on building and maintaining a modern cloud-based platform for the insurance and financial services sector. The position involves developing backend services in .NET and frontend components in Angular, deployed on Microsoft Azure. It is a long-term project within an international agile team. 🗂️ Requirements: Strong experience in fullstack development with .NET and Angular, Hands-on experience with .NET 8, .NET Core, ASP.NET Core, C# 10, Experience with Entity Framework, Proficiency in Angular and TypeScript, Experience with SQL databases, Experience with Microsoft Azure services: Service Bus, Azure SQL, App Service, Azure DevOps, Experience with cloud-based solution design and development, Experience with unit testing and code reviews, Proficiency with Visual Studio or JetBrains IDEs, Experience working in Agile environments 📃 Skills: .NET, .NET8, .NETCore, ASPNETCore, C#, EntityFramework, Angular, TypeScript, SQL, Azure, ServiceBus, AzureSQL, AppService, AzureDevOps, VisualStudio, JetBrains, UnitTesting, Agile 🏢 Description: In Cyclad we work with top international IT companies in order to boost their potential in delivering outstanding, cutting-edge technologies that shape the world of the future. We are seeking an experienced Fullstack Developer (.NET + Angular) to join a remote development team. This role focuses on developing a modern technology platform that supports core business processes in the insurance and financial services sector. If you are an experienced fullstack developer who thrives in a collaborative environment, takes ownership, and proactively proposes solutions, this role is for you. Project information: Type of project: IT services Office location: Poland Work mode: Remote Budget: 100-130 PLN net /h - b2b Project length: Long-term Only candidates with citizenship in the European Union and residence in Poland Start date: ASAP (depending on candidate availability) Project scope: Develop backend services using .NET 8 / .NET Core / ASP.NET Core and C# 10 Implement frontend components using Angular and TypeScript Design and maintain scalable, reliable, and secure cloud-based solutions hosted on Microsoft Azure Work with Azure services including Service Bus, Azure SQL, App Service, and Azure DevOps pipelines Expand and maintain the existing code base, ensuring quality through unit tests and code reviews Collaborate with an international, distributed team following agile practices Ensure consistent implementation and alignment with modern software engineering best practices Requirements: Strong background in fullstack development with .NET and Angular Hands-on experience with .NET 8, .NET Core, ASP.NET Core, C# 10, and Entity Framework Proficiency in Angular, TypeScript, and SQL Experience with Visual Studio / JetBrains IDEs Azure experience: Service Bus, Azure SQL, App Service, Azure DevOps (pipelines and automation) Strong communication skills, proactiveness, attention to detail, and ability to lead feature implementations Agile mindset and experience working in team-based environments Nice to have experience in insurance or financial services projects We offer: Remote working model Full-time job agreement based on b2b and employment contract Private medical care with dental care (covering 70% of costs) Multisport card (also for an accompanying person) Life insurance

🏢 Summary: Mid-Level .NET Developer role focused on building and maintaining online banking applications in a hybrid work model. The position involves developing scalable financial systems, integrating APIs, and ensuring high code quality in an Agile environment. You will contribute to digital transformation initiatives within modern fintech projects. 🗂️ Requirements: Minimum 3 years of experience with C# and .NET (Core, 5/6, Framework), Strong experience with MSSQL, Experience implementing REST APIs, Experience writing unit tests using xUnit and xRay, Knowledge of message queuing systems (RabbitMQ or Kafka), Knowledge of OOP and SOLID principles, Basic knowledge of Kubernetes and Docker, Experience with CI/CD tools, Familiarity with Agile/Scrum methodology, Communicative English proficiency, Legal right to work in the European Union 📃 Skills: C#, .NET, .NETCore, .NET5, .NET6, .NETFramework, MSSQL, REST, xUnit, xRay, RabbitMQ, Kafka, Kubernetes, Docker, OOP, SOLID, CICD, Bitbucket, JIRA, TeamCity, Agile, Scrum 🏢 Description: Unleash Innovation in Financial Technology — Shape the Future of Online Banking! Łódź-based opportunity with a hybrid work model (2 days in the office per month) As a Mid-Level .NET Developer , you will be working for our client, a leader in online banking, on cutting-edge financial technology projects designed to enhance user experience and system efficiency. Join a fast-paced environment where your expertise drives digital transformation and financial innovation. Your main responsibilities: Develop and maintain applications using C#, .NET Core Implement and integrate RESTful APIs Write unit tests to ensure code quality Follow and apply design patterns and best practices such as OOP and SOLID Work with MSSQL databases Collaborate with cross-functional teams using tools like Bitbucket, JIRA, and TeamCity Participate in Agile/Scrum meetings and contribute to sprint planning and review Troubleshoot and resolve complex technical issues You're ideal for this role if you have: At least 3 years of experience with C#, .NET Core, .NET 5/6, or .NET Framework Solid experience with MSSQL Basic knowledge of Kubernetes and Docker Experience in implementing REST APIs Proficiency in writing unit tests with xUnit and xRay Experience with message queuing systems (e.g., RabbitMQ, Kafka) Knowledge of design patterns and best practices (OOP, SOLID) Familiarity with Agile/Scrum methodologies Proficiency with CI/CD tools Strong problem-solving skills and attention to detail It is a strong plus if you have: (optional) Basic knowledge of COBOL Knowledge of WCF, WinForms Language required for the role: Communicative proficiency in English Communicative proficiency in Polish Eligibility to work in Europe: Only candidates with an existing legal right to work in the European Union will be considered for this role. #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.

🏢 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: The role involves developing and maintaining a large-scale open banking platform focused on secure, high-performance API integrations with European financial institutions. The position centers on backend development in .NET and Java within cloud-based, distributed systems. You will design and optimize secure connectivity solutions aligned with PSD2 standards in an international, collaborative environment. 🗂️ Requirements: Strong experience building backend services using Java and .NET, Approximately 6 years of experience in C# programming, Solid knowledge of Java programming, Strong understanding of API design, Understanding of distributed systems, Experience working in cloud environments, Experience integrating with banks via PSD2 interfaces, Ability to write clean, maintainable, testable code 📃 Skills: C#, Java, .NET, APIs, PSD2, Cloud, DistributedSystems 🏢 Description: Join an international technology team building next-generation open banking solutions used across Europe. Our platform enables secure, reliable, and high-quality connectivity to financial institutions—powering innovative products and services in the digital payments ecosystem. You will work in a highly skilled, collaborative environment alongside teammates located mainly in Denmark, Ireland, and Romania. As a .NET Developer, you will contribute to the development, improvement, and maintenance of a large-scale open banking platform. You will work on advanced API solutions focused on security, data processing, monitoring, onboarding automation, and high-performance connectivity. This role is ideal for engineers who enjoy solving complex problems, working in modern cloud environments, and collaborating with international teams. Our expectations: Strong experience in building backend services (Java + .Net). Approximately 6 years of relevant experience in C# programming. Solid knowledge in Java programming. Solid understanding of API design, distributed systems, cloud environments. Experience in establishing bank connections through PSD2 interfaces. Ability to write clean, maintainable, and testable code. Experience working in fast-paced, product-centric environments. Collaborative mindset and eagerness to work closely with product and engineering peers. Proficiency in English, fluent Polish. Hybrid work 2-3 days per week (Gdansk). Proficiency in English, fluent Polish, Hybrid work 2-3 days per week (Warsaw or Gdansk). Main responsibilities: Design, develop, and maintain APIs and integration modules connecting the platform to thousands of European banks and financial institutions. Collaborate with engineers and product stakeholders to define requirements, set acceptance criteria, and deliver solutions. Contribute to architecture by ensuring scalability, maintainability, and adherence to best practices. Maintain quality through code reviews, testing, and continuous improvement initiatives. Solve complex problems involving performance, distributed systems, and regulatory constraints.

🏢 Summary: B2B contract for a Mid/Senior FullStack Engineer to modernize and migrate legacy .NET applications to a modular, cloud-native Azure architecture in the banking sector. The role combines backend development in .NET with frontend work in React, focusing on refactoring legacy systems, building scalable APIs, and implementing CI/CD and observability practices. Hybrid work model with strong influence on architectural decisions and cloud migration. 🗂️ Requirements: 5+ years of commercial experience with C# and .NET (Framework and .NET Core/6+), Strong proficiency in EF Core and MSSQL (query tuning, transactions, indexing), Commercial experience with React and TypeScript, Experience building and securing REST APIs (authentication, versioning, validation), Familiarity with Azure services (App Service, Functions, SQL, Service Bus, Storage), Experience with automated testing (unit, integration, contract, E2E), Experience with CI/CD pipelines (Azure DevOps or GitHub Actions), Ability to work with legacy .NET codebases (ASP.NET MVC, Razor, WPF, WinForms), English at B2+ level 📃 Skills: C#, .NET, .NETCore, .NET6, .NET8, EFCore, MSSQL, T-SQL, React, TypeScript, REST, Azure, AppService, AzureFunctions, AzureSQL, ServiceBus, AzureStorage, xUnit, Jest, Playwright, Cypress, Git, AzureDevOps, GitHubActions, ASP.NET, MVC, Razor, WPF, WinForms, DDD, CleanArchitecture 🏢 Description: We are looking for FullStack Engineer (.NET & React) Location: Kraków / Hybrid (7 days in the office per month) Contract Type: B2B Contract Seniority: Mid / Senior About the Project Join a high-impact modernization initiative for a leading player in the banking sector . We are transforming a portfolio of approximately a dozen .NET applications and MSSQL databases into a modular, cloud-native Azure architecture. As a FullStack Engineer, you will play a dual role: evolving existing production services (including legacy UI and desktop components) while systematically extracting business logic to re-implement it into a modern, scalable ecosystem. This is a unique opportunity to influence the transition from monolithic architectures to high-performance, distributed cloud services. Your Responsibilities Design & Development: Build backend services and APIs using .NET 6/8 following Clean Architecture and DDD patterns. Frontend Evolution: Develop and maintain React + TypeScript frontends, managing the incremental migration from legacy UI modules. Modernization: Read, refactor, and extract complex business logic from legacy .NET codebases and T-SQL stored procedures. Quality Assurance: Write and maintain comprehensive automated tests (Unit, Integration, Contract, and E2E). DevOps & Observability: Create CI/CD pipelines (Azure DevOps/GitHub Actions) and instrument services for deep observability (metrics, logs, distributed traces). Collaboration: Participate in domain modeling, architecture discussions, and Agile ceremonies with Architects and Product Owners. Skills & Experience We Require Experience: 5+ years of commercial experience with C# and the .NET ecosystem (both Framework and .NET Core/6+). Database Expertise: Strong proficiency in EF Core and MSSQL (including query tuning, transactions, and indexing). Frontend: Solid production experience with React and TypeScript. Web Services: Practical experience in building and securing REST APIs (Auth, Versioning, Validation). Cloud: Familiarity with Azure services (App Service, Functions, SQL, Service Bus, Storage). Testing & Tooling: Experience with xUnit, Jest, and Playwright/Cypress, as well as disciplined Git practices. Legacy Handling: The ability to read and reason about legacy codebases (ASP.NET MVC, Razor, WPF, or WinForms). Communication: English at a B2+ level for technical documentation and team collaboration. Nice to Have Experience with Infrastructure as Code (Terraform or Bicep). Knowledge of Docker and Kubernetes (AKS). Background in migrating monoliths to microservices. Azure Developer Associate certification. What We Offer Impact: Real influence on the architecture and the cloud migration roadmap. Autonomy: Direct collaboration with Tech Leads and Architects in a flat structure. Modern Stack: Opportunity to work with the latest .NET versions (6/8) and React. Efficiency: Fast technical onboarding with immediate access to repos, CI/CD pipelines, and monitoring tools. Flexible Hybrid Model: Remote-first approach with only 7 planned days in the Kraków office per month. Benefits : Luxmed and Multisport Card