Senior Developer - Telco

🏢 Summary: Technical role focused on designing and developing charging and OSG solutions for 4G/5G mobile networks, enabling scalable and secure voice and data monetisation services. The position involves building high‑availability telecom systems, integrating APIs and microservices, and contributing to security and enterprise architecture standards. You will support international deployments and optimize business‑critical platforms across multiple markets. 🗂️ Requirements: Technical degree in Computer Science, Telecommunications or related field, Minimum 3+ years of software development experience, Practical knowledge of mobile operator technologies, session control and charging, Strong programming skills in Java and Python, Experience with REST APIs and microservices architecture, Hands-on experience with GitLab CI/CD and Git workflows, Experience with cloud platforms (AWS, Azure, GCP or OTC), Knowledge of containerization and Docker, Understanding of telecom protocols (SS7, SIP), Knowledge of application and platform security standards, Experience with automated testing and debugging, Experience working with high-availability systems 📃 Skills: Java, Python, HTML, CSS, JavaScript, TypeScript, React, Angular, Vue, Git, GitLab, CI/CD, REST, Microservices, Docker, AWS, Azure, GCP, OTC, SS7, SIP, Wireshark, JainSLEE, RobotFramework, TMF, ODA 🏢 Description: As an Expert IT/Telco Developer | OSG Voice Monetisation & Charging, you will play a key role in shaping the technical direction of Orange Group’s mobile monetisation ecosystem. Your work will directly influence how 4G/5G services are charged, secured, and delivered across multiple markets. You will design and develop advanced solutions for Charging and OSG (Open Services Gateway) platforms, ensuring scalability, security, and alignment with next-generation network technologies. Beyond telecom platforms, you will also have the opportunity to contribute to innovative IT and Security projects, including initiatives that leverage LLM-based solutions. Working as part of an international engineering community spanning Tunisia, Egypt, France, and Poland , you will support 26 Orange countries across MEA and Europe. This role offers the opportunity to build global, shared, business‑critical services that power the future of mobile voice and data monetisation within the Orange Group. Expert IT/Telco Developer | OSG Voice Monetisation & Charging Job Description Design, develop, and maintain software solutions for telecom and IT systems. Build end‑to‑end voice and data services for mobile networks, ensuring scalability and global reusability. Collaborate with cross‑functional, international teams to deliver business‑critical features. Optimize and enhance system performance in high‑availability environments. Develop and integrate APIs (REST, microservices) for internal and external systems. Ensure code quality through testing, debugging, and code reviews. Participate in the setup and maintenance of CI/CD pipelines (GitLab). Support and troubleshoot production issues to ensure system stability. Contribute to automation of processes and workflows. Document technical solutions, architectures, and system changes. Act as a technical specialist for Charging (ZTE, Huawei, Ericsson, etc.) and Voice Monetisation (ZTE, Microsoft, etc.). Recommend best development practices and harmonize technology across the Orange footprint. Implement technical security aspects in all areas of responsibility. Collaborate on designing and applying security standards, authentication protocols, and best practices. Contribute to Orange enterprise architecture standards (e.g., TMF ODA, TMF APIs). Participate in RFP processes and provide strategic technology recommendations at Group level. Requirements Technical university degree in Computer Science, Telecommunications, or a related field. Practical knowledge of mobile operator technologies, including services, session control, and charging. Understanding of application and platform security, as well as relevant industry standards and telecom protocols. Strong programming skills in Java and Python , with additional proficiency in HTML, CSS, JavaScript, and TypeScript . Experience with modern front‑end frameworks (React, Angular, or Vue.js) is a plus. Hands‑on experience with GitLab CI/CD and solid understanding of Git workflows. Familiarity with cloud platforms such as OTC, GCP, AWS, or Azure. Experience with containerization, microservices, RESTful APIs, and Docker. Knowledge of SS7 , SIP , network traffic analysis (Wireshark), and optionally Jain SLEE. Strong debugging and problem‑solving skills, including experience with Robot Framework and automated testing. Experience working in Agile/Scrum environments and collaborating with international, cross‑functional teams. Openness to continuous learning, knowledge sharing, and diversity in professional work. Strong command of English. Minimum 3+ years of experience in software development, including work on high‑availability and business‑critical systems. We offer Stable employment based on an employment contract Hybrid work model (1 day from the office / 4 days from home) Pension program – after 6 months of employment, Orange will contribute 7% of your gross salary each month to your retirement account Private medical care with PZU Zdrowie Interest-free loans for housing, health, and other purposes Subsidy for vacation FitProfit sports card Integration events and trips co-financed from the social fund Option to join group insurance on preferential terms Smartphone with unlimited Internet – also for private use Preferential offer for Orange services Diverse and tailored development opportunities – training, access to educational platforms (including language learning platforms), internal internship programs, and inspiring educational events “Health YES” – a program for people with disabilities “I’m in the game” – support for parents returning to work after parental leave Wellbeing programs Volunteering in cooperation with the Orange Foundation

🏢 Summary: Role focused on designing and developing scalable, secure charging and OSG solutions for 4G/5G mobile voice and data monetisation in high‑availability telecom environments. The position involves building end‑to‑end services, integrating APIs and microservices, and contributing to CI/CD, security standards, and enterprise architecture across multiple international markets. It combines telecom charging expertise with modern cloud, containerization, and automation practices. 🗂️ Requirements: Technical degree in Computer Science, Telecommunications or related field, Minimum 3+ years of software development experience, Strong programming skills in Java and Python, Knowledge of mobile operator technologies, session control and charging, Understanding of telecom protocols and security standards, Experience with REST APIs and microservices architecture, Hands-on experience with GitLab CI/CD and Git workflows, Experience with containerization and Docker, Knowledge of SS7 and SIP protocols, Experience with network traffic analysis, Experience in high-availability and business-critical systems, Fluent English 📃 Skills: Java, Python, HTML, CSS, JavaScript, TypeScript, React, Angular, Vue, GitLab, Git, REST, Microservices, Docker, SS7, SIP, Wireshark, JainSLEE, RobotFramework, GCP, AWS, Azure, OTC, TMF, CI/CD 🏢 Description: As an Expert IT/Telco Developer | OSG Voice Monetisation & Charging, you will play a key role in shaping the technical direction of Orange Group’s mobile monetisation ecosystem. Your work will directly influence how 4G/5G services are charged, secured, and delivered across multiple markets. You will design and develop advanced solutions for Charging and OSG (Open Services Gateway) platforms, ensuring scalability, security, and alignment with next-generation network technologies. Beyond telecom platforms, you will also have the opportunity to contribute to innovative IT and Security projects, including initiatives that leverage LLM-based solutions. Working as part of an international engineering community spanning Tunisia, Egypt, France, and Poland , you will support 26 Orange countries across MEA and Europe. This role offers the opportunity to build global, shared, business‑critical services that power the future of mobile voice and data monetisation within the Orange Group. Expert IT/Telco Developer | OSG Voice Monetisation & Charging Job Description Design, develop, and maintain software solutions for telecom and IT systems. Build end‑to‑end voice and data services for mobile networks, ensuring scalability and global reusability. Collaborate with cross‑functional, international teams to deliver business‑critical features. Optimize and enhance system performance in high‑availability environments. Develop and integrate APIs (REST, microservices) for internal and external systems. Ensure code quality through testing, debugging, and code reviews. Participate in the setup and maintenance of CI/CD pipelines (GitLab). Support and troubleshoot production issues to ensure system stability. Contribute to automation of processes and workflows. Document technical solutions, architectures, and system changes. Act as a technical specialist for Charging (ZTE, Huawei, Ericsson, etc.) and Voice Monetisation (ZTE, Microsoft, etc.). Recommend best development practices and harmonize technology across the Orange footprint. Implement technical security aspects in all areas of responsibility. Collaborate on designing and applying security standards, authentication protocols, and best practices. Contribute to Orange enterprise architecture standards (e.g., TMF ODA, TMF APIs). Participate in RFP processes and provide strategic technology recommendations at Group level. Requirements Technical university degree in Computer Science, Telecommunications, or a related field. Practical knowledge of mobile operator technologies, including services, session control, and charging. Understanding of application and platform security, as well as relevant industry standards and telecom protocols. Strong programming skills in Java and Python , with additional proficiency in HTML, CSS, JavaScript, and TypeScript . Experience with modern front‑end frameworks (React, Angular, or Vue.js) is a plus. Hands‑on experience with GitLab CI/CD and solid understanding of Git workflows. Familiarity with cloud platforms such as OTC, GCP, AWS, or Azure. Experience with containerization, microservices, RESTful APIs, and Docker. Knowledge of SS7 , SIP , network traffic analysis (Wireshark), and optionally Jain SLEE. Strong debugging and problem‑solving skills, including experience with Robot Framework and automated testing. Experience working in Agile/Scrum environments and collaborating with international, cross‑functional teams. Openness to continuous learning, knowledge sharing, and diversity in professional work. Strong command of English. Minimum 3+ years of experience in software development, including work on high‑availability and business‑critical systems. We offer Stable employment based on an employment contract Hybrid work model (1 day from the office / 4 days from home) Pension program – after 6 months of employment, Orange will contribute 7% of your gross salary each month to your retirement account Private medical care with PZU Zdrowie Interest-free loans for housing, health, and other purposes Subsidy for vacation FitProfit sports card Integration events and trips co-financed from the social fund Option to join group insurance on preferential terms Smartphone with unlimited Internet – also for private use Preferential offer for Orange services Diverse and tailored development opportunities – training, access to educational platforms (including language learning platforms), internal internship programs, and inspiring educational events “Health YES” – a program for people with disabilities “I’m in the game” – support for parents returning to work after parental leave Wellbeing programs Volunteering in cooperation with the Orange Foundation

🏢 Summary: Leadership role responsible for managing complex, strategic projects and programs within the Network and Technology area, including transformation and architecture initiatives. The position oversees TTM processes, resource allocation, risk management, and successful implementation of new offerings. It also drives project management standards and supports executive-level decision making. 🗂️ Requirements: 8+ years of experience in Telco/IT project and program management, Minimum 3 years of leadership or managerial experience, Master’s degree (or higher education equivalent), Fluent Polish and English (spoken and written), Experience in managing complex, strategic projects, Experience in multi-organizational and international project environments, Experience in cooperation with senior executives, Strong knowledge of project and program management standards, Ability to manage project resource allocation, Ability to manage risk in large-scale projects 📃 Skills: ProjectManagement, ProgramManagement, Telco, IT, TTM, RiskManagement, ResourceManagement, PortfolioManagement, StakeholderManagement, Leadership, English, Polish 🏢 Description: Nasz zespół: Jako zespół stawiamy na współpracę, wzajemną pomoc i bezpośredniość. Jesteśmy ambitni i lubimy przecierać szlaki nowym, innowacyjnym rozwiązaniom w naszej firmie. Zapraszamy, poznaj z nami świat technologii i projektów! Dyrektor / Dyrektorka Projektów Kluczowych i TTM Zadania: Kompleksowe zarządzanie złożonymi projektami i programami o strategicznym znaczeniu dla obszaru Sieć i Technologie oraz Orange Polska w szczególności o charakterze wizerunkowym, transformacyjnym i architektonicznym. Zapewnianie wysokiej jakości standardów współpracy z interesariuszami wewnętrznymi i zewnętrznymi. Reprezentowanie obszaru Sieć i Technologie w procesie TTM, w tym przygotowanie rekomendacji dla Executive Product Board, rozwiązywanie problemów, odpowiedzialność za powodzenie wdrożenia nowej oferty. Zarządzanie procesem alokacji zasobów projektowych w obszarze Sieci i Technologii, w tym wymiarowanie oraz optymalizacja wykorzystania zasobów w projektach. Doradztwo w zakresie zarządzania projektami i programami, w tym dostarczenie niezbędnych narzędzi oraz efektywnych metod zarządzania. Zapewnianie zasobów do projektów i programów strategicznych. Monitorowanie i zarządzanie ryzykiem w tym obszarze. Budowanie silnej społeczności kierowników projektów w obszarze Sieci i Technologii umożliwiającej ciągły rozwój kompetencji. Oczekiwania od idealnego kandydata 8+ lat doświadczenia na rynku Telco/IT w obszarze zarządzania projektami i programami, w tym mile widziane 3+ lat pozytywnych doświadczeń na stanowisku kierowniczym/liderskim. Wykształcenie wyższe potwierdzone dyplomem na poziomie co najmniej magistra. Biegłe posługiwanie się językiem polskim i angielskim (w mowie i piśmie) pozwalającym na swobodne prowadzenie spotkań biznesowych. Zdolności adaptacyjne do pracy/zarządzania zespołami różno-kulturowymi. Pożądane doświadczenie ze współpracy w zespołach projektowych multi-organizacyjnych i międzynarodowych. Doświadczenie we współpracy z wyższą kadrą menedżerską. Zdolności interpersonalne – komunikacyjne i negocjacyjne pozwalające na efektywną komunikację i współpracę. Dobre zrozumienie ekosystemu biznesowego OPL i celów strategicznych firmy. Zdolność pracy nad wieloma zadaniami jednocześnie. To oferujemy: Stabilne zatrudnienie w oparciu o umowę o pracę Pracę w modelu hybrydowym (2 dni z biura / 3 dni z domu) Program emerytalny – po 6 miesiącach pracy, Orange co miesiąc dołoży 7% Twojej pensji brutto na Twoje konto emerytalne Prywatną opiekę medyczną w PZU Zdrowie Pożyczki bez oprocentowania na cele mieszkaniowe, zdrowotne i inne Dofinasowanie do wypoczynku Kartę sportową FitProfit Wydarzenia integracyjne i wyjazdy współfinansowane z funduszu socjalnego Możliwość dołączenia do ubezpieczenia grupowego na preferencyjnych warunkach Smartfon z nielimitowanym Internetem – również do użytku prywatnego Preferencyjną ofertę na usługi Orange Zróżnicowane i dopasowane do potrzeb możliwości rozwoju – szkolenia, dostęp do platform edukacyjnych (w tym platformy do nauki języków obcych), program staży wewnętrznych i inspirujące wydarzenia edukacyjne „Zdrowie na TAK” - program dla osób z niepełnosprawnościami „Jestem w grze” – wsparcie dla rodziców powracających do pracy po urlopach rodzicielskich Programy wellbeingowe Wolontariat we współpracy z Fundacją Orange

🏢 Summary: Senior Mobile Developer role focused on building and maintaining an enterprise-grade mobile SDK for passwordless authentication used globally. The position involves low-level mobile engineering, security and cryptography implementation, and performance optimization across Android and iOS platforms. The role includes architectural decision-making and close collaboration with backend teams in an international environment. 🗂️ Requirements: 6+ years commercial experience in mobile development (Android and/or iOS), Strong knowledge of Kotlin and/or Swift, Practical experience in developing mobile SDKs, Cross-platform experience with Android and iOS, Knowledge of OS internals (memory, threading, security model), Experience with cryptography or threat modeling, Experience in performance optimization, Knowledge of concurrency and asynchronous programming, Experience with CI/CD for mobile applications, English proficiency min. B2, Polish proficiency min. C1 📃 Skills: Kotlin, Swift, Android, iOS, SDK, Cryptography, Concurrency, CI/CD, Threading, Memory, Security, Git 🏢 Description: Cześć! Dla naszego klienta, międzynarodowej firmy z branży usług informatycznych, poszukujemy Senior Mobile Developera, który dołączy do zespołu budującego nowoczesną platformę passwordless authentication, wykorzystywaną na milionach urządzeń na całym świecie. To rozwiązanie klasy enterprise, używane m.in. w sektorze finansowym i bankowym, które odpowiada za bezpieczne zarządzanie tożsamością użytkowników. Projekt koncentruje się na rozwoju zaawansowanego mobile SDK, które stanowi warstwę bezpieczeństwa działającą bezpośrednio na urządzeniu użytkownika. Będziesz mieć okazję pracować blisko systemu operacyjnego, w obszarze security, wydajności i low-level engineeringu, tworząc produkt używany przez innych developerów. Wspólnie z zespołem będziesz podejmować kluczowe decyzje architektoniczne mające wpływ na dalszy rozwój produktu. Lokalizacja: Gdańsk Model pracy: Hybryda lub zdalnie (sporadyczne wizyty w biurze) Forma zatrudnienia: B2B lub umowa o pracę Wynagrodzenie: B2B: 169 - 190 PLN/h + VAT || UoP: 20750 - 23000 PLN brutto Zakres obowiązków: rozwój i utrzymanie mobilnego SDK (Android/iOS), projektowanie i implementacja rozwiązań z zakresu bezpieczeństwa i kryptografii, praca z pamięcią, wielowątkowością i optymalizacją wydajności, integracja z mechanizmami systemowymi (lifecycle, permissions, system services), analiza zmian w systemach operacyjnych i dostosowywanie SDK do nowych wersji platform, udział w projektowaniu rozwiązań, security reviews oraz podejmowaniu decyzji architektonicznych, ścisła współpraca z zespołami backendowymi, praca w środowisku międzynarodowym (język angielski na co dzień). Oczekiwania: 6+ lat doświadczenia komercyjnego w tworzeniu rozwiązań mobilnych (Android i/lub iOS), bardzo dobra znajomość Kotlin i/lub Swift, praktyczne doświadczenie w tworzeniu mobile SDK, elastyczność i gotowość do działania cross-platformowo (zarówno w środowisku Androidowym, jak i iOS), solidna wiedza z zakresu: OS internals (memory, threading, security model) oraz lifecycle i zarządzania zasobami, doświadczenie z kryptografią lub threat modelingiem, doświadczenie w optymalizacji wydajności, praktyczna wiedza z zakresu concurrency i programowania asynchronicznego, znajomość procesów CI/CD dla aplikacji mobilnych, bardzo dobra znajomość języka angielskiego (min. B2), płynna znajomość języka polskiego (min. C1), umiejętność samodzielnej pracy i branie odpowiedzialności za tworzony produkt, nastawienie na bycie częścią zespołu i otwartość na feedback. Mile widziane: doświadczenie cross-platform (np. Kotlin Multiplatform, React Native, Flutter), znajomość narzędzi do profilowania (np. Instruments, Perfetto, Systrace), doświadczenie z komponentami sprzętowymi (TEE, Secure Enclave, KeyStore), wiedza z zakresu mobile security (RASP, root/jailbreak detection, anti-tampering, itp.), podstawowa znajomość UX / procesów projektowania produktów cyfrowych. Oferujemy: realny wpływ na rozwój produktu używanego globalnie przez miliony użytkowników, dużą samodzielność oraz szerokie możliwości rozwoju, pracę w płaskiej strukturze i możliwość proponowania własnych rozwiązań, środowisko nastawione na jakość i konstruktywny feedback, wsparcie przełożonego, program mentoringowy i regularne spotkania 1on1, współpracę w oparciu o kontrakt B2B lub umowę o pracę, elastyczne godziny pracy (start między 7:00 a 10:00), nowoczesny sprzęt (MacBook + urządzenia testowe), integracje zespołowe i warsztaty techniczne, pakiet benefitów (prywatna opieka medyczna, MultiSport, lekcje angielskiego), pracę zdalną ze sporadycznymi wizytami w gdańskim biurze.

🏢 Summary: The offer is for a C++ Developer working on telecommunications systems, focusing on 5G, IoT, and next-generation network infrastructure. The role involves developing high-performance C++ applications, customizing Yocto-based embedded environments, and managing CMake build systems in Linux. You will contribute to mission-critical telco projects with strong emphasis on reliability, optimization, and integration. 🗂️ Requirements: Minimum 5 years of C++ development experience, Experience in telecommunications industry, Proficiency with Yocto, Strong knowledge of CMake, Strong experience with Linux development and debugging, Experience with network protocols and telecommunications standards, Experience with Git, Ability to work in team-based development environment, Fluent English, Fluent Polish, Residence in Poland 📃 Skills: C++, Yocto, CMake, Linux, Git, 5G, IoT, TCP/IP, Embedded, Networking 🏢 Description: Join our team at Sii to work on an exciting project in the Telco area. As a C++ Developer , you'll have the opportunity to work in the fields of C++ and Yocto development. Be a part of developing pioneering advancements in 5G technology, IoT solutions, and next-generation network infrastructure. You will be contributing to projects that shape the future of global communication, working alongside top professionals in a dynamic and innovative environment. Be a part of something big and take your career to the next level with us! Your tasks Development of C++ applications for telecommunications systems, ensuring high performance and reliability Customize and optimize Yocto-based build environments for embedded systems, tailoring solutions to project requirements Create and manage CMake build configurations to streamline the compilation of software components Develop and integrate software modules within Linux environments, addressing issues and implementing improvements Collaborate with cross-functional teams to design, implement, and test new features and functionalities Troubleshoot and debug complex system issues, leveraging your knowledge of telecommunications protocols and standards Participate in code reviews and maintain coding standards, ensuring high-quality and maintainable code Requirements Minimum 5 years of proven experience in C++ development, particularly in the telecommunications industry Proficiency with Yocto for embedded systems development and customization Solid understanding of CMake for managing project builds and dependencies Strong experience with Linux operating systems, including development and debugging Ability to work effectively in a team environment and communicate complex technical concepts clearly Experience with network protocols and telecommunications standards is highly desirable Familiarity with version control systems, such as Git, and collaborative development workflows Good command of English (spoken and written) Residing in Poland required Fluent in Polish required What we offer Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022 Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more Comfortable workplace – class A offices or remote work Dozens of fascinating projects for prestigious brands from all over the world PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers Investment in your growth – meetups, webinars, training platform and technology blog – you choose Fantastic atmosphere created by all Sii Power People If you want to work on systems with high operational significance — apply now!

🏢 Summary: Senior iOS Developer role focused on leading the modernization of a secure, high performance mobile SDK for fraud prevention and customer authentication in financial services. The position involves defining architecture, implementing core SDK components, and establishing standards for distribution, testing, and security across multiple iOS environments. The role requires close collaboration with cross functional teams to ensure scalability, compliance, and performance optimization. 🗂️ Requirements: 8+ years of iOS development experience, Strong proficiency in Swift, Experience with Objective C interoperability, Experience building and maintaining reusable iOS SDKs or frameworks, Knowledge of XCFramework, Swift Package Manager, and CocoaPods, Understanding of static and dynamic linking, module stability, library evolution, Experience optimizing application size and performance, Knowledge of iOS security concepts including Keychain and Secure Enclave, Experience with Instruments for performance analysis, Experience with XCTest and XCUITest, Familiarity with code signing and provisioning processes 📃 Skills: Swift, Objective-C, Combine, async/await, XCFramework, SwiftPM, CocoaPods, Keychain, SecureEnclave, AppAttest, DeviceCheck, XCTest, XCUITest, Instruments, BGTaskScheduler 🏢 Description: Project overview The project focuses on modernizing a mobile SDK used for digital fraud prevention and customer authentication in financial services. You will contribute to building a scalable, secure, and high performance SDK designed for integration into external applications across multiple environments. Team You will work in a distributed team of iOS engineers, backend engineers, and security specialists. The team collaborates closely across regions, following shared engineering standards and participating in design reviews and system level discussions. Position overview We are looking for a Senior iOS Developer who can lead technical design and implementation for an iOS SDK modernization initiative. You will define architecture, validate migration strategies, develop proof of concept components, and establish engineering standards for distribution, testing, and security. Technology stack Swift, Objective C, Combine, async await, XCFramework, Swift Package Manager, CocoaPods, Keychain, Secure Enclave, App Attest, DeviceCheck, XCTest, XCUITest, Instruments, BGTaskScheduler Responsibilities Lead technical design and implementation of iOS SDK components Define and maintain architecture aligned with enterprise standards Develop proof of concept solutions to validate design approaches Ensure SDK compatibility across multiple iOS versions and devices Establish guidelines for SDK distribution, integration, and versioning Collaborate with cross functional teams on security and compliance requirements Optimize application performance, memory usage, and energy efficiency Implement secure coding practices and support data protection mechanisms Drive testing strategies including unit, integration, and UI testing Contribute to code reviews and support engineering best practices Requirements 8+ years of experience in iOS development Strong proficiency in Swift and experience with Objective C interoperability Experience building and maintaining reusable iOS SDKs or frameworks Understanding of framework distribution using XCFramework, Swift Package Manager, and CocoaPods Knowledge of static and dynamic linking, module stability, and library evolution Experience managing dependencies and optimizing application size and performance Understanding of iOS security concepts including Keychain, Secure Enclave, and certificate pinning Familiarity with privacy and App Store compliance standards Experience with background execution models and related constraints in iOS Knowledge of performance analysis tools such as Instruments Experience with testing frameworks including XCTest and XCUITest Familiarity with code signing, provisioning, and distribution processes Nice to have Experience working in financial services or regulated environments Exposure to sensor data processing such as CoreMotion or gesture handling Experience contributing to enterprise architecture standards Background in security focused application development What We Offer: Vacation days : Up to 26 business days per year. 10 illness/special days off per year (fully paid, no medical papers needed) for all contract types Health and life insurance (Luxmed) MyBenefit platform with Multisport option Internal psychological support service English language classes from the first working day Access to external learning platforms : O’Reilly, LinkedIn Learning, Udemy, and a wide catalog of diverse internal training Flexible workplace : work from the office, from home, or choose a hybrid option Tech Skills Mentoring Program Opportunities to develop as a public speaker, mentor, or technical interviewer Fully paid idle (bench) when not involved in a project Certification reimbursement (AWS, GCP, Microsoft, etc.)

🏢 Summary: The offer is for a C++ Developer role focused on building high-performance and high-reliability mobile network systems in the telecommunications domain. The position involves developing and maintaining solutions related to 5G, IoT, and next-generation network infrastructure within an agile environment. The role includes designing, implementing, testing, and debugging telecom systems using C++ and Linux. 🗂️ Requirements: Minimum 3 years of experience in C++ development, Experience in software development in the telecommunication industry, Experience with mobile network systems, Knowledge of network protocols and telecommunications standards, Strong experience with Linux development and debugging, Experience with Git version control, Experience with CMake build configurations, Fluent Polish, Communicative English, Residence in Poland 📃 Skills: C++, Linux, Git, CMake, 5G, IoT, Telecommunications, Scrum 🏢 Description: Join our team at Sii to work on an exciting project in the telco area. As a C++ Developer, you'll have the opportunity to develop pioneering advancements in 5G technology, IoT solutions, and next-generation network infrastructure. You will be contributing to projects that shape the future of global communication, working alongside top professionals in a dynamic and innovative environment. Be a part of something big and take your career to the next level with us! Your tasks Work as a C++ developer for high-performance and high-reliability mobile network systems and applications Collaborate with cross-functional teams to design, implement, and test new features and functionalities Troubleshoot and debug complex system issues, leveraging your knowledge of telecommunications protocols and standards Participate in code reviews and maintain coding standards, ensuring high-quality and maintainable code Create and/or manage CMake build configurations Work agile to provide high-value contributions as a member of a scrum team Requirements Experience in software development in the telecommunication industry (mobile networks preferred) Prior experience working with network protocols and telecommunications standards Minimum 3 years of experience in C++ development Strong experience with Linux operating systems, including development and debugging Familiarity with version control systems, such as Git, and collaborative development workflows Ability to work effectively in a team environment and communicate complex technical concepts clearly Good command of English (communicative for all work purposes) Fluent Polish required Residing in Poland required What we offer Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022 Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more Comfortable workplace – class A offices or remote work Dozens of fascinating projects for prestigious brands from all over the world PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers Investment in your growth – meetups, webinars, training platform and technology blog – you choose Fantastic atmosphere created by all Sii Power People If you want to work on systems with high operational significance — apply now!

🏢 Summary: The offer is for a C++ Developer to build high-performance, high-reliability mobile network systems within 5G and IoT projects. The role focuses on developing, testing, and maintaining next-generation telecommunications solutions in a Linux environment. You will work in an agile team contributing to advanced network infrastructure and protocol-based systems. 🗂️ Requirements: Minimum 3 years of C++ development experience, Experience in telecommunications industry, preferably mobile networks, Hands-on experience with network protocols and telecommunications standards, Strong experience with Linux development and debugging, Experience with Git version control, Experience creating or managing CMake build configurations, Ability to work in Agile/Scrum environment 📃 Skills: C++, Linux, Git, CMake, 5G, IoT, TCPIP, Scrum, Telecommunications 🏢 Description: Join our team at Sii to work on an exciting project in the telco area. As a C++ Developer, you'll have the opportunity to develop pioneering advancements in 5G technology, IoT solutions, and next-generation network infrastructure. You will be contributing to projects that shape the future of global communication, working alongside top professionals in a dynamic and innovative environment. Be a part of something big and take your career to the next level with us! Your tasks Work as a C++ developer for high-performance and high-reliability mobile network systems and applications Collaborate with cross-functional teams to design, implement, and test new features and functionalities Troubleshoot and debug complex system issues, leveraging your knowledge of telecommunications protocols and standards Participate in code reviews and maintain coding standards, ensuring high-quality and maintainable code Create and/or manage CMake build configurations Work agile to provide high-value contributions as a member of a scrum team Requirements Experience in software development in the telecommunication industry (mobile networks preferred) Prior experience working with network protocols and telecommunications standards Minimum 3 years of experience in C++ development Strong experience with Linux operating systems, including development and debugging Familiarity with version control systems, such as Git, and collaborative development workflows Ability to work effectively in a team environment and communicate complex technical concepts clearly Good command of English (communicative for all work purposes) Fluent Polish required Residing in Poland required What we offer Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022 Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more Comfortable workplace – class A offices or remote work Dozens of fascinating projects for prestigious brands from all over the world PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers Investment in your growth – meetups, webinars, training platform and technology blog – you choose Fantastic atmosphere created by all Sii Power People If you want to work on systems with high operational significance — apply now!

🏢 Summary: Senior Android Mobile Developer role focused on building and enhancing Android test tools and backend components within a Token ID ecosystem for secure payment solutions. The position involves developing high-impact mobile applications and ensuring scalable, high-performance integrations with backend services. Work is delivered in a hybrid model as part of a long-term B2B contract. 🗂️ Requirements: 7+ years of professional experience, Strong Android development experience, Proficiency in Java 21, Experience with Spring Boot, Experience with REST APIs and Web Services, Knowledge of SQL, Experience with Kubernetes, Experience with Docker, Experience with Jenkins, Proficiency with IntelliJ, Experience with Claude, Experience with GenAI 📃 Skills: Android, Java, Spring, REST, SQL, Kubernetes, Docker, Jenkins, IntelliJ, Claude, GenAI 🏢 Description: We are looking for an experienced Senior Android Mobile Developer to join a project for a world-leading payment technology company . You will work on advanced Android tools within a Token ID ecosystem, contributing to high-impact mobile applications used globally. 🔧 Project Overview The project focuses on Token ID Android Tools development , including multiple mobile applications supporting secure payment solutions. 📍 Location & Work Model Location: Warsaw or Gdansk Work Mode: Hybrid (1-2 days hybrid from the office) ⏳ Contract Details Contract Type: B2B (details to be shared) Daily Rate: 1.100 PLN/day – 1.300 PLN/day 👤 Experience Minimum 7+ years of professional experience 🛠 Mandatory Skills Please ensure your CV clearly reflects hands-on experience with the following: Android Development Java 21 Spring Boot REST APIs & Web Services SQL Kubernetes (k8s) Docker Jenkins IntelliJ Claude Code GenAI 📱 Responsibilities Develop and maintain new features for Android test tools and their backend components Design, develop, and enhance Android-based tool applications within the Token ID ecosystem Work on the following engagement components: Issuer Mobile Application TR Mobile Application Terminal Mobile Application Demo Wallet Ensure high-quality, scalable, and well-performing code Optimize performance and ensure seamless backend integration Collaborate with cross-functional teams across the full SDLC Debug, troubleshoot, and continuously improve applications 🚀 Join us and be part of a cutting-edge project for a global payment technology leader, where your work will directly impact secure, large-scale mobile solutions used worldwide.If you’re ready to take on a challenging Android role and work with modern technologies - we’d love to hear from you!

🏢 Summary: Senior Android Developer role focused on leading the modernization of a secure, high performance mobile SDK for digital fraud prevention and authentication in financial services. The position involves defining architecture, validating migration strategies, and establishing standards for SDK distribution, security, and testing. You will drive technical design, performance optimization, and cross functional collaboration in a distributed team. 🗂️ Requirements: 8+ years of Android development experience, Strong Kotlin proficiency, Java interoperability experience, Experience building and maintaining Android SDKs or libraries, AAR packaging and Maven publishing experience, Advanced Gradle configuration knowledge, ProGuard and R8 configuration experience, Dependency management and host app compatibility management, Android lifecycle and WorkManager expertise, Performance optimization and ANR prevention knowledge, Android security implementation using Keystore and encryption, Play Integrity API or SafetyNet experience, Experience with JUnit, Robolectric, and Espresso 📃 Skills: Kotlin, Java, Coroutines, Flow, Gradle, Maven, AAR, ProGuard, R8, WorkManager, AndroidX, Keystore, Encryption, SafetyNet, PlayIntegrity, JUnit, Robolectric, Espresso 🏢 Description: Project overview The project focuses on modernizing a mobile SDK used for digital fraud prevention and customer authentication within financial services. You will contribute to building a secure, scalable, and performance driven SDK designed for integration into a wide range of external Android applications. Team You will work in a distributed cross functional team including Android engineers, backend developers, and security specialists. The team collaborates across regions, following shared engineering practices and contributing to design decisions and system improvements. Position overview We are looking for a Senior Android Developer who will lead the technical design and implementation of an Android SDK modernization initiative. You will define architecture, validate migration strategies, develop proof of concept components, and establish engineering standards for distribution, testing, and security. Technology stack Kotlin, Java, Coroutines, Flow, Gradle, Maven, AAR, ProGuard, R8, WorkManager, Android Keystore, EncryptedSharedPreferences, Play Integrity API, SafetyNet, JUnit, Robolectric, Espresso, AndroidX Responsibilities Lead the design and development of Android SDK components Define and maintain scalable and maintainable SDK architecture Develop proof of concept solutions to validate architectural decisions Ensure SDK compatibility across different Android versions and device manufacturers Establish best practices for SDK distribution, integration, and versioning Collaborate with cross functional teams on security and compliance requirements Optimize performance including startup time, memory usage, and binary size Implement secure data storage and communication mechanisms Drive testing strategy including unit, integration, and instrumentation testing Participate in code reviews and contribute to engineering standards Requirements 8+ years of experience in Android development Strong proficiency in Kotlin and experience with Java interoperability Experience building, distributing, and maintaining reusable Android SDKs or libraries Experience with AAR packaging and artifact publishing using Maven repositories Strong knowledge of Gradle including build configuration and customization Understanding of ProGuard and R8 configuration and code optimization Experience managing dependencies and ensuring compatibility with host applications Knowledge of Android lifecycle management and background execution using WorkManager Understanding of performance optimization and avoiding ANR and UI performance issues Experience with Android security features including Android Keystore and encryption mechanisms Familiarity with Play Integrity API or SafetyNet and certificate pinning Experience with performance monitoring and profiling tools Experience with testing frameworks including JUnit, Robolectric, and Espresso Nice to have Experience working in financial services or regulated environments Exposure to sensor based data processing using Android SensorManager Knowledge of API desugaring and backward compatibility strategies Understanding of SDK footprint optimization techniques Experience contributing to architecture guidelines or internal engineering standards What We Offer: Vacation days : Up to 26 business days per year. 10 illness/special days off per year (fully paid, no medical papers needed) for all contract types Health and life insurance (Luxmed) MyBenefit platform with Multisport option Internal psychological support service English language classes from the first working day Access to external learning platforms : O’Reilly, LinkedIn Learning, Udemy, and a wide catalog of diverse internal training Flexible workplace : work from the office, from home, or choose a hybrid option Tech Skills Mentoring Program Opportunities to develop as a public speaker, mentor, or technical interviewer Fully paid idle (bench) when not involved in a project Certification reimbursement (AWS, GCP, Microsoft, etc.)