Mobile Developer (.NET)

🏢 Summary: Full-time in-house Senior Mobile Developer / .NET Technical Lead role in Warsaw to lead and deliver a secure, mobile-first platform integrated with backend and operational systems. The position combines hands-on mobile development with architectural ownership of a .NET backend and technical leadership responsibilities. Offers relocation/visa support, competitive salary, and the opportunity to shape and grow the engineering team. 🗂️ Requirements: Strong commercial experience developing and shipping mobile applications, Experience with mobile security, biometrics, push notifications, BLE, and API-driven architectures, Solid understanding of .NET/C# backend development, Experience integrating third-party systems and operational platforms, Knowledge of CRM, CMS, ERP, payments, reporting, and cloud infrastructure, Ability to define technical standards and documentation, English or Polish language proficiency 📃 Skills: .NET, C#, Mobile, API, BLE, Biometrics, Push, CRM, CMS, ERP, Payments, Cloud 🏢 Description: Senior Mobile Developer with .NET experience (Warsaw) Full-time in-house role in Warsaw Salary up to $7,000/month Relocation / Visa Assistance (If need) A leading logistics and storage company is seeking a Senior Mobile Developer / .NET Technical Lead to own and deliver a major mobile-first technology platform. This hands-on leadership role will drive the development of a secure customer mobile app integrated with operational systems, access control, payments, reporting, and a .NET-based backend platform. Key Responsibilities - Lead the design and delivery of the mobile application - Build secure features including authentication, biometrics, permissions, push notifications, and Bluetooth Low Energy (BLE) - Integrate mobile, web, CRM/CMS, payment, reporting, and operational systems - Design APIs and help shape .NET/C# backend architecture - Define technical standards, documentation, and delivery processes - Work directly with the CEO and leadership team - Help build and lead the engineering team as the platform grows Requirements: - Mobile Experience (Important) - Strong commercial experience developing and shipping mobile applications - Experience with mobile security, biometrics, push notifications, BLE, and API-driven architectures - Solid .NET/C# backend understanding - Experience integrating third-party systems and operational platforms - Knowledge of CRM, CMS, ERP, payments, reporting, and cloud infrastructure - Strong ownership, documentation, and security mindset - English or Polish Language Spoken Nice to Have: - Umbraco or similar CRM/CMS platforms - Access control or hardware integrations - Logistics, storage, facilities, or operational technology experience - Previous technical leadership or architecture ownership What We Offer: - Full-time in-house role in Warsaw - Salary up to $7,000/month - Relocation Assistant - Modern office environment - Direct access to senior leadership - Long-term strategic technology project - Real ownership of product and platform direction - Opportunity to build and lead a team - Performance-based bonuses - Possible visa/work permit sponsorship for Ukrainian or other EU candidates Role Summary You will lead the development of the company's core mobile platform, integrating customer-facing applications with backend systems, access control, and operational infrastructure while helping shape the future technology strategy of a growing logistics business.

🏢 Summary: B2B contract role for a Senior Mobile Engineer to develop and scale a high-traffic React Native mobile application used internationally. The position involves owning features end-to-end, contributing to architecture decisions, and collaborating closely with backend teams. The focus is on building performant, stable, and well-tested iOS and Android apps. 🗂️ Requirements: 4+ years of professional experience with React Native, Strong knowledge of iOS and Android platforms, Experience with app releases and distribution, Solid understanding of mobile architecture and design patterns, Experience with automated testing, Very good English communication skills, Working proficiency in Polish 📃 Skills: ReactNative, iOS, Android, JavaScript, MobileArchitecture, DesignPatterns, AutomatedTesting, AppStore, GooglePlay, English, Polish 🏢 Description: Senior Mobile Engineer (React Native) Location: Remote Contract: B2B Salary: up to 30 000 PLN net / month About the company A product-focused technology company developing a mobile and web platform that supports educational institutions and families in their daily operations. The product simplifies communication, reduces administrative work, and is used at scale by a large and growing international user base. Role overview The company is looking for an experienced Senior Mobile Engineer (React Native) to help develop and scale a high-traffic mobile application. You will work on core product features, contribute to architectural decisions, and collaborate closely with backend and product teams. Responsibilities Develop and maintain a large-scale React Native mobile app (iOS & Android) Own features from concept to production Collaborate with backend engineers on new functionality Write clean, maintainable, and well-tested code Contribute to architectural and technical decisions Optimize performance, stability, and developer experience Requirements 4+ years of professional experience with React Native Strong knowledge of iOS and Android platforms Experience with app releases and distribution Solid understanding of mobile architecture and design patterns Experience with automated testing Very good English communication skills Working proficiency in Polish Nice to have Experience with Firebase Knowledge of mobile analytics tools Advanced testing experience Familiarity with the JavaScript ecosystem (Node.js, React, Next.js) Understanding of mobile UI/UX principles What’s offered 30 000 PLN net monthly (B2B) 20–26 days of paid time off Modern equipment and tools Benefits package (sports card, private healthcare, English lessons) High autonomy and real impact on product and technical decisions Transparent culture with no micromanagement

🏢 Summary: Full-stack role focused on leading frontend and mobile development with Angular and Flutter while supporting backend services in C#/.NET and SQL Server. The position involves building scalable applications, integrating REST APIs, and contributing across the full Agile lifecycle through CI/CD deployment. Hybrid work in Kraków with B2B contract. 🗂️ Requirements: 3+ years professional experience, Strong proficiency in Angular, Strong proficiency in Flutter, Strong proficiency in TypeScript, Strong proficiency in HTML, Strong proficiency in CSS, Experience with C#, Experience with .NET, Experience with SQL Server, Experience designing and integrating REST APIs, Experience with Git, Experience working in Agile methodology, Ability to perform unit testing and debugging, Knowledge of performance, scalability and secure coding practices 📃 Skills: Angular, Flutter, TypeScript, HTML, CSS, C#, .NET, SQLServer, REST, Git, Agile, CI/CD, Testing, Debugging 🏢 Description: Join a dynamic development team in Kraków to build high-quality, scalable applications. This role is unique in its breadth: you will lead frontend and mobile efforts using Angular and Flutter , while simultaneously supporting backend services powered by C#/.NET and SQL . You will be part of a product-focused team where your work directly impacts real customers daily, moving projects from initial requirements through Agile sprints to final deployment. Details Location: Kraków (Hybrid) Rate: 90-105 PLN/h net + VAT (B2B). Employment Type: Full-time. Seniority: 3+ years of professional experience. Start Date: ASAP. Responsibilities Cross-Platform Development: Building and maintaining applications using Angular (web) and Flutter (mobile). Backend Support: Developing and supporting services with C#/.NET and SQL Server . API Integration: Designing and implementing RESTful APIs and ensuring seamless frontend-to-backend connectivity. Quality Assurance: Performing unit testing, debugging, and participating in rigorous code reviews. Agile Collaboration: Contributing to the full lifecycle of Agile sprints, from planning to CI/CD deployment. Requirements Frontend/Mobile: Strong proficiency in Angular, Flutter, TypeScript , and modern CSS/HTML. Backend: Experience with C#/.NET and SQL Server (knowledge of NoSQL is a plus). Workflow: Familiarity with Git and Agile methodologies. Security: Awareness of performance, scalability, and secure coding practices. Nice to Have Mobile Extras: Experience with Ionic or Cordova . Cloud & DevOps: Familiarity with Azure/AWS , Azure Functions, and CI/CD pipelines. Identity: Knowledge of OAuth, JWT, or IdentityServer .

🏢 Summary: 12-month full-time contract (with possible extension) for a Senior FullStack Developer to enhance and maintain a Corporate Netbank application in the banking sector. The role focuses on developing and modernizing backend and frontend components, implementing new features, fixing bugs, and supporting production in both microservice and monolithic architectures. Hybrid work model with 3 days per week in the Warsaw office. 🗂️ Requirements: Minimum 5 years experience with Java 7/8, Minimum 5 years experience with Spring Framework, Minimum 5 years experience with Spring Boot, Minimum 5 years experience with Maven, Minimum 5 years experience with JSP, Minimum 5 years experience with JavaScript, Minimum 5 years experience with SQL, Minimum 5 years experience with Git, Experience writing REST APIs, Backend service design and implementation, Experience with microservice architecture, Experience with monolithic architecture, Experience in unit testing, Minimum 2 years experience with Angular, Minimum 2 years experience with Jasmine, Experience working in Agile environments 📃 Skills: Java, Maven, JSP, JavaScript, SQL, Git, Spring, SpringBoot, REST, Angular, Jasmine, Microservices, Monolith, UnitTesting 🏢 Description: Location: hybrid - 3 days a week from the office in Warsaw Duration of assignment: 12 months first contract (prolongation expected). Language: English Industry: banking. Workload: Full time Overview The position of Senior FullStack Developer is a crucial role within our Corporate Netbank system team. You will contribute significantly to enhancing an application designed for large corporate clients to manage their accounts efficiently. The developer should possess strong experience in backend and frontend technologies, with a collaborative mindset and a commitment to excellence. Main Responsibilities Maintain and enhance the Corporate Netbank Application. Implement new features and bug fixes. Respond to production incidents and make compliance changes. Develop and improve services in both microservice and monolithic architectures. Participate in transitioning from legacy systems to modern solutions. Key Requirements Minimum 5 years of experience with Maven, JSP, JavaScript, Java 7/8, Git, Spring Framework, Spring Boot, SQL. Proven experience in writing REST APIs. Backend services design and implementation skills. Experience in unit testing. At least 2 years of experience with Angular and Jasmine. Proficient in agile working environments. Strong analytical skills for legacy code. Excellent communication skills. Fluency in English. Nice to Have Knowledge of SOLID principles and design patterns.

🏢 Summary: Senior Software Engineer role focused on designing, developing, and integrating advanced Shopify (primarily Shopify Plus) solutions within enterprise environments. The position involves building custom applications, headless architectures, and complex integrations with core business systems. Hybrid full-time role in Warsaw with B2B or CoE contract options. 🗂️ Requirements: 5+ years of experience in e-commerce architecture or technical consulting, Minimum 3 years of hands-on experience with Shopify ecosystem, Strong experience with Shopify Plus, including admin and app ecosystem, Experience building custom Shopify applications, Experience with Shopify Functions and Checkout UI extensions, Experience with headless Shopify architectures, Hands-on experience with Microsoft Entity Framework, Experience working with Shopify REST and GraphQL APIs, Strong knowledge of HTML, CSS, JavaScript, TypeScript, Experience integrating Shopify with ERP, OMS, PIM or similar enterprise systems 📃 Skills: Shopify, ShopifyPlus, Liquid, Hydrogen, Oxygen, EntityFramework, REST, GraphQL, HTML, CSS, JavaScript, TypeScript, SCSS, ShopifyFunctions, CheckoutUI, Node.js, Ruby 🏢 Description: 💰 Salary: 21,500-28,700 PLN/Month 💻 Warsaw, Poland (Hybrid - 3 days in office, 2 days remote) 🕦 Full-time ☑️ B2B or CoE We’re looking for a Senior Software Engineer to join a fast-growing international tech company focused on building modern, data-driven platforms that power digital transformation in the financial and enterprise sectors. Requirements: 5+ years of experience in e-commerce architecture, technical consulting, or a comparable senior level role, with a minimum of 3 years focused on the Shopify ecosystem. Strong hands-on experience with the Shopify platform, particularly Shopify Plus, including admin capabilities, Liquid templating, and the broader app ecosystem. Proven experience building custom Shopify applications, including advanced customizations using Shopify Functions and Checkout UI extensions. Solid understanding of headless Shopify architectures, with experience in Hydrogen and Oxygen implementations. Hands-on experience working with Microsoft Entity Framework. experience working with Shopify APIs, including REST and GraphQL, along with strong knowledge of modern web technologies such as HTML, CSS, JavaScript and TypeScript. Demonstrated ability to design and deliver integrations with enterprise systems such as ERP, OMS, and PIM. Nice to have: Previous experience leading or contributing to re platforming projects from legacy systems. Familiarity with backend technologies such as Node.js and Ruby. Shopify certifications or other relevant e-commerce platform certifications. Key Responsibilities: Design and document end to end technical architectures for both new and existing Shopify (primarily Shopify Plus) stores, covering storefront implementation (headless or theme based), backend services, integration strategy, and security. Develop, customize, and maintain high quality Shopify themes using HTML5, Liquid, CSS3/SCSS, along with JavaScript and TypeScript. Implement and design complex integrations between Shopify and core enterprise platforms such as CRM, CDP, WMS, PIM, OMS, and ERP, utilizing GraphQL and REST APIs. Develop and manage custom Shopify applications, delivering advanced capabilities through Shopify Functions and Checkout Extensibility to support specific client requirements. Collaborate closely with the Sales team to support technical evaluations, define solution scope, estimate effort, and deliver clear, compelling technical presentations to clients. Provide technical guidance to stakeholders and engineering teams, advising on Shopify solutions, architecture decisions, and industry best practices.

🏢 Summary: Senior Software Developer role focused on building and evolving a modern mobile healthcare application that supports people with hearing disabilities. The position involves end-to-end development of mobile and backend solutions within a cross-functional, international Agile team. You will drive technical decisions, contribute to architecture, and ensure high-quality, scalable software delivery. 🗂️ Requirements: 5+ years of software development experience, Strong proficiency in C# or .NET MAUI or native Android or iOS development, Experience in mobile application development, Understanding of software architecture and design patterns, Experience with Agile methodologies (Scrum or SAFe), Ability to design and develop backend solutions, Experience with code reviews and automated testing, Fluent English 📃 Skills: C#, .NET, MAUI, Android, iOS, Scrum, SAFe, Architecture, Testing, Backend 🏢 Description: Build technology that truly matters Join our agile product team in Warsaw and help people with hearing disabilities improve their everyday lives through innovative mobile solutions. As part of our R&D organization, you will work on a modern mobile healthcare application connecting cutting-edge hearing technology with intuitive user experiences. About the role As a Senior Software Developer, you will play a key role in shaping, building, and evolving our mobile solutions. Working in a cross‑functional, international team, you will contribute end‑to‑end — from requirement discussions to design, development, testing, and release. Working with us, You will receive full-time work agreement, with a permanent contract after 3 months; flexible working hours; great opportunities for usage of newest technology; a generous benefits package (private medical care, sports card, and more); a Scandinavian-style work culture that values equality, autonomy, and work-life balance — no titles, no silos – pure collaboration. What you will focus on Designing and developing high‑quality mobile and backend solutions Driving technical decisions and contributing to system architecture Delivering new features that improve user experience and product value Collaborating closely with product owners, designers, and other developers Ensuring code quality through testing, reviews, and best engineering practices Investigating and resolving complex technical challenges Mentoring other developers and supporting team growth What we are looking for Solid experience in software development (typically 5+ years) Strong skills in at least one of the following: C# / .NET MAUI Native mobile development (Android and/or iOS) Good understanding of software architecture and design patterns Experience with Agile ways of working (Scrum / SAFe) Focus on quality, maintainability, and clean code Strong communication skills and fluent English Curiosity and motivation to continuously improve What we offer Meaningful work in healthcare technology Modern tech stack and engineering practices Flexible working hours and hybrid setup Private medical care, sports card and other benefits Scandinavian work culture built on trust, equality, autonomy, and work–life balance — no hierarchy, no silos, just true collaboration Opportunities for growth – both technical and leadership

🏢 Summary: Senior FullStack Developer role in the banking sector focused on maintaining and enhancing a Corporate Netbank application for large corporate clients. The position involves developing new features, fixing bugs, handling production incidents, and modernizing legacy systems within microservice and monolithic architectures. This is a 12-month hybrid contract in Warsaw with strong emphasis on backend and frontend development. 🗂️ Requirements: Minimum 5 years experience with Java 7/8, Minimum 5 years experience with Spring Framework and Spring Boot, Minimum 5 years experience with Maven, Minimum 5 years experience with JSP and JavaScript, Minimum 5 years experience with Git, Minimum 5 years experience with SQL, Experience in designing and implementing REST APIs, Backend services design and implementation experience, Experience with unit testing, Minimum 2 years experience with Angular, Experience with Jasmine, Experience working with microservice and monolithic architectures, Ability to analyze and work with legacy code 📃 Skills: Java, Spring, SpringBoot, Maven, JSP, JavaScript, Git, SQL, REST, Angular, Jasmine, Microservices, Monolith, UnitTesting 🏢 Description: Location: hybrid - 3 days a week from the office in Warsaw Duration of assignment: 12 months first contract (prolongation expected). Language: English Industry: banking. Workload: Full time. Overview The position of Senior FullStack Developer is a crucial role within our Corporate Netbank system team. You will contribute significantly to enhancing an application designed for large corporate clients to manage their accounts efficiently. The developer should possess strong experience in backend and frontend technologies, with a collaborative mindset and a commitment to excellence. Main Responsibilities Maintain and enhance the Corporate Netbank Application. Implement new features and bug fixes. Respond to production incidents and make compliance changes. Develop and improve services in both microservice and monolithic architectures. Participate in transitioning from legacy systems to modern solutions. Key Requirements Minimum 5 years of experience with Maven, JSP, JavaScript, Java 7/8, Git, Spring Framework, Spring Boot, SQL. Proven experience in writing REST APIs. Backend services design and implementation skills. Experience in unit testing. At least 2 years of experience with Angular and Jasmine. Proficient in agile working environments. Strong analytical skills for legacy code. Excellent communication skills. Fluency in English. Nice to Have Knowledge of SOLID principles and design patterns.

🏢 Summary: Senior Fullstack Developer role focused on modernizing banking systems through REST API development, microservices extraction, and system integrations. The position involves refactoring legacy applications and contributing to both microservice and monolith architectures in an international environment. Hybrid work model with B2B contract. 🗂️ Requirements: Minimum 6 years of experience in Java development, Experience with reactive programming, Working knowledge of Spring framework, Working knowledge of Hibernate, Experience with SQL, Experience with REST API development, Experience with microservices architecture, Experience with Git, Minimum 2 years of experience with Angular 📃 Skills: Java, Spring, Hibernate, SQL, REST, Microservices, Git, Angular, Reactive, DDD, Cucumber, SAFe 🏢 Description: Industry: Banking Work model: Hybrid in Warsaw or Tricity - 3 days a week in the office Rate: up to 170 PLN/h (B2B contract) Summary: The role of a Senior Fullstack Developer focuses on modernizing systems, enhancing customer experience through API development, and ensuring seamless integration of various services. Main Responsibilities: Core duties include building REST API solutions and collaborating with teams to create optimal solutions. Building REST API solutions and integrations with other applications Refactoring legacy applications by extracting logic into microservices Collaborating with other developers, teams, and stakeholders to create optimal solutions Participating in the development and continuous improvement of services in both microservice and monolith architectures Key Requirements: Hands-on experience in Java development (at least 6 years preferred) Familiarity with reactive programming Working knowledge of Spring and Hibernate frameworks Experience with SQL, REST, Microservices, and GIT At least 2 years of experience with Angular Nice to Have: Familiarity with the DDD (Domain-Driven Design) approach Experience with Cucumber framework Previous work in an international team with English as the common language Exposure to SAFE Agile methodologies Other Details: Team Composition: International team. Communication Language: English.

🏢 Summary: Senior Fullstack Developer role focused on modernizing banking systems through REST API development, microservices extraction, and system integrations. The position involves enhancing customer-facing services and contributing to both microservice and monolith architectures in an international environment. Hybrid work model with B2B contract up to 170 PLN/h. 🗂️ Requirements: Minimum 6 years of commercial experience in Java development, Experience with reactive programming, Working knowledge of Spring framework, Working knowledge of Hibernate, Experience with SQL, Experience building REST APIs, Experience with microservices architecture, Experience with GIT, Minimum 2 years of experience with Angular 📃 Skills: Java, Spring, Hibernate, SQL, REST, Microservices, GIT, Angular, Cucumber, DDD 🏢 Description: Industry: Banking Work model: Hybrid in Warsaw or Tricity - 3 days a week in the office Rate: up to 170 PLN/h (B2B contract) Summary: The role of a Senior Fullstack Developer focuses on modernizing systems, enhancing customer experience through API development, and ensuring seamless integration of various services. Main Responsibilities: Core duties include building REST API solutions and collaborating with teams to create optimal solutions. Building REST API solutions and integrations with other applications Refactoring legacy applications by extracting logic into microservices Collaborating with other developers, teams, and stakeholders to create optimal solutions Participating in the development and continuous improvement of services in both microservice and monolith architectures Key Requirements: Hands-on experience in Java development (at least 6 years preferred) Familiarity with reactive programming Working knowledge of Spring and Hibernate frameworks Experience with SQL, REST, Microservices, and GIT At least 2 years of experience with Angular Nice to Have: Familiarity with the DDD (Domain-Driven Design) approach Experience with Cucumber framework Previous work in an international team with English as the common language Exposure to SAFE Agile methodologies Other Details: Team Composition: International team. Communication Language: English.

🏢 Summary: 100% remote B2B opportunity to lead a development team in building and maintaining scalable applications within an agile environment. The role combines hands-on full-stack development with strategic technical leadership, focusing on robust system architecture and faster delivery of new solutions. Long-term cooperation with a two-stage recruitment process including a technical test. 🗂️ Requirements: Proficiency in .NET, Proficiency in C#, Experience in full-stack development, Experience with front-end technologies, Experience with document-based databases, Knowledge of event-based messaging frameworks, Experience with cloud services, Experience with containerization, Ability to lead development teams, Experience working in agile environment 📃 Skills: .NET, C#, Angular, MongoDB, Cloud, Docker, Microservices, REST, Git 🏢 Description: Work model: 100% remote Start date: Flexible Rate: up to 215 PLN/h netto + VAT Contract : B2B, long-term cooperation (12-month contract up front + extensions) Recruitment process : 2 stages, including a technical test estimated to take 2-4 hours. Summary: The role focuses on leading the development team to create new solutions and maintain systems within an agile environment, emphasizing the importance of robust applications and strategic direction. Main Responsibilities: Lead the development team in creating and maintaining applications. Adopt wider technology practices and address the speed of new application delivery. Engage in hands-on development while guiding the strategic direction of projects. Collaborate with teams to gather specifications and perform technical analysis. Navigate complex systems and ensure they are built to scale. Manage developer quality and capacity amidst organizational constraints. Key Requirements: Proficient in .NET and C#. Experience with full-stack development, including front-end technologies. Familiarity with document-based databases. Knowledge of event-based messaging frameworks. Experience with cloud services and containerization. Nice to Have: Prior experience in the banking or financial services sector. Familiarity with Angular or other modern front-end frameworks. Experience with MongoDB or similar environments. Other Details: Environment: .NET, C#, Angular, MongoDB, moving towards cloud solutions. Team Structure: Full Stack Developers working closely with Business Analysts.