Mobile Ad Engineer Android

🏢 Summary: Opportunity for a Senior Android Developer to build and scale a large consumer mobile application used daily by millions across Europe. The role focuses on delivering a high-quality native Android experience, contributing to architecture decisions, and improving engineering standards within a growing product. You will work in cross-functional teams to develop scalable, maintainable, and high-performance mobile solutions. 🗂️ Requirements: 5+ years commercial experience in Android development, Strong hands-on experience with Kotlin, Strong hands-on experience with Java, Experience refactoring and improving existing codebases, Solid understanding of MVVM architecture, Knowledge of Clean Architecture principles, Understanding of SOLID principles, Experience with Git, Experience with CI/CD pipelines, Experience with release management processes, Strong knowledge of Android development best practices, Understanding of Material Design principles, Experience working in Agile cross-functional teams, Professional English proficiency 📃 Skills: Android, Kotlin, Java, MVVM, CleanArchitecture, SOLID, Git, CI/CD, MaterialDesign, Agile 🏢 Description: Senior Android Developer About the Project Join a team building one of Europe's leading mobile applications, used daily by millions of users. The product is undergoing rapid growth and international expansion, with a strong focus on scaling its mobile platform and delivering a best-in-class native Android experience across multiple European markets. We are looking for an experienced Senior Android Developer who wants to have a real impact on product development, mobile architecture, and engineering standards while working on a large-scale consumer application. Your Responsibilities Develop high-quality, testable, and maintainable Android applications. Contribute to architectural decisions and help build scalable mobile solutions. Participate in code reviews and promote engineering best practices. Collaborate closely with Product Managers, Designers, QA Engineers, and other development teams. Create and maintain technical documentation and specifications. Continuously improve development processes, tools, and workflows. Evaluate and implement new technologies to enhance application performance and development efficiency. Requirements 5+ years of commercial experience in Android development. Strong hands-on experience with Kotlin and Java. Proven experience in refactoring and improving existing codebases. Solid understanding of MVVM, Clean Architecture, and SOLID principles. Experience with Git, CI/CD pipelines, and release management processes. Strong knowledge of Android development best practices. Understanding of Material Design and modern mobile UI/UX principles. Experience working in Agile, cross-functional teams. Good communication skills and professional English proficiency. Nice to Have Experience working on large-scale mobile applications with a significant user base. Familiarity with modern Android libraries and frameworks. Experience with performance optimization and application monitoring. Interest in mobile platform development and engineering excellence.

🏢 Summary: B2B contract for a Senior Android Engineer to develop and maintain high‑impact mobile applications for a leading European media and entertainment provider. The role focuses on building scalable Android solutions for live sports, fan engagement and premium content platforms used by millions of users. It is a 6‑month remote project (with possible extension) starting ASAP. 🗂️ Requirements: Strong experience with Kotlin, Commercial experience with Jetpack Compose, Experience building responsive UIs for phones and tablets, Experience developing and maintaining mobile backend services, Knowledge of SOLID principles and mobile architecture patterns, Experience with Dagger or Hilt for Dependency Injection, Experience with Kotlin Coroutines, Experience with AndroidX Architecture Components, Experience with modular Android development, Experience with Firebase SDKs, Experience with CI/CD pipelines, Experience with observability and performance monitoring, Experience with Unit Testing and UI Testing, Proficiency with Git workflows, Practical experience working in Agile environments 📃 Skills: Kotlin, JetpackCompose, Android, AndroidX, Coroutines, RxJava, Dagger, Hilt, Firebase, Git, CI/CD, UnitTesting, UITesting, SOLID, Agile 🏢 Description: Project details: Role: Senior Android Engineer Duration: 6 months (with the possibility of further extension), Start: ASAP, the kick-off of the project is planned for April 2026, Contract: B2B, Equipment: Laptop provided by the customer, Work mode: 100% remote from Poland. About our customer: Our customer is a rapidly growing international software company that specialises in delivering media and entertainment projects. It is expanding its capabilities in the areas of the Internet of Things (IoT), cloud computing and tailored artificial intelligence (AI) solutions. They collaborate with global organisations to design and implement strategic infrastructures, content workflows, and consumer-facing digital applications. This role will enable you to support their ongoing European expansion while working on a high-impact digital product used by millions. About the project: Project for Large European Media & Entertainment Provider. You will work on behalf of the customer for one of Europe's leading media and entertainment companies, an organisation known for delivering premium content, live sports, award-winning news and innovative digital products to millions of users. The client operates in a fast-paced, innovation-driven environment and is continuously evolving its digital experiences across mobile, streaming and interactive platforms. Their teams are recognised for developing cutting-edge technology solutions that prioritise customer experience and large-scale impact. Your work will focus on mobile applications related to: Live sports experiences, Fan engagement features, Premium news and content experiences. Required Skills: Strong expertise in Kotlin and Jetpack Compose, Experience building responsive UIs for phones and tablets, Experience creating and maintaining mobile backend services, Solid understanding of SOLID principles and mobile architecture patterns, Dagger/Hilt for Dependency Injection, Kotlin Coroutines (must‑have); RxJava (nice‑to‑have), AndroidX Architecture Components, Experience with modular Android app development, Familiarity with Firebase SDKs, Experience with CI/CD pipelines , observability and performance monitoring, Strong background in Unit Testing and UI Testing, Excellent Git workflows, branching and commit practices, Practical understanding of Agile principles, ceremonies, planning and estimating. Responsibilities: Lead the development and maintenance of high‑quality Android applications serving millions of users, Implement scalable features using modern Android best practices and clean architecture, Collaborate with designers, backend developers and product owners across both the consultancy and the end client, Ensure performance, reliability and exceptional user experience across diverse Android devices, Participate in architectural decision-making and contribute to platform‑wide best practices, Maintain strong test coverage and contribute to continuous integration and delivery pipelines, Contribute to monitoring, observability and performance improvements, Coach and support other engineers when needed.

🏢 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.)

🏢 Summary: Senior Software Engineer role focused on building and operating monetization systems for a large-scale live game. The position involves developing and maintaining highly available backend services, web UI surfaces, and client integrations with strong DevOps and reliability practices. You will work across the full stack to support purchasing, rewards, and progression systems with high reliability expectations. 🗂️ Requirements: Strong Java 21 expertise, Experience with distributed systems and service-oriented architecture, Proficiency in REST APIs and SQL databases, Experience with CI/CD systems, Working knowledge of C++ for client integration, Understanding of client-server interactions (HTTP/REST), Proficiency in HTML, CSS, and JavaScript, Experience with Linux environments, Scripting skills in Bash or Python, Experience with observability and monitoring tools, Version control experience, Experience in incident response and live operations 📃 Skills: Java, C++, SQL, REST, HTML, CSS, JavaScript, Linux, Bash, Python, Datadog, Git, Perforce, Jenkins, PagerDuty 🏢 Description: About the role: Our client is an established game studio renowned for its highly successful MOBA and FPS franchises. ​As a Senior Software Engineer on the Monetisations team, you will have the chance to build and operate key player-facing systems that support the purchasing, rewarding, and progression experiences within one of the world’s largest live games.​ You will be responsible for maintaining game systems that are healthy, reliable, and continually evolving. You will work across backend services, deployment pipelines, monitoring systems, and integration points with the Game Client with very high reliability and quality expectations. You must combine a DevOps mindset with the ability to contribute code across the full game technology stack.​By joining the team, you will help accelerate the delivery of upcoming strategic initiatives. You will work on a daily basis with an engineering team based in Dublin (Ireland), but occasional afternoon meetings with other teams based on the US West Coast (LA and Seattle) are also possible. This role requires engineers with strong Java backend skills, solid web UI skills, a DevOps mindset , and familiarity with C++ client integration Responsibilities: Maintaining and improving large-scale distributed systems that support players globally Automate operational processes and reduce team toil (scripts, pipelines, diagnostic tools) Improve observability, monitoring, alerting, and deployment workflows Working on highly available backend services with strong operational rigor Supporting and extending the existing Game Client experience (Web UI surfaces built with HTML/CSS/JS and C++ integration points) Contributing to KTLO efforts , including quality improvements, bug fixes, and feature updates Participating in live operations , including on-call rotation, incident investigation, stability improvements, release validation, and root-cause analysis Collaborating across product, QA, design, art, and data teams to support seasonal content, offers, store changes, and monetization updates Feature delivery within established systems , often spanning multiple pods or workstreams Required Core Technical Skills: Backend Strong Java 21 expertise (main language for service maintenance/development) Distributed systems debugging and service-oriented architecture REST APIs, SQL data stores CI/CD systems (Cloudbees Jenkins ) Game Client Working familiarity with C++ for client integration fixes Understanding of client-server interactions (HTTP/REST) and data flow paths Web Surfaces & UI HTML, CSS, Javascript DevOps Tooling & Reliability Engineering Linux , Bash / Python scripting Observability platforms ( Datadog ) Version Control expertise ( Git , Perforce ) Incident response and postmortem practices ( Pagerduty ) Behavioural Expectations: High ownership over production health and system reliability Clear communicator during high-pressure situations (e.g. live incidents) Autonomy in navigating legacy systems and ambiguous problem spaces Strong collaboration with backend, client, QA, and operations teams Player-first thinking – minimizing downtime, regressions, and impact on players Nice To Have: Experience in the gaming industry, particularly with online multiplayer games Experience working with cross-discipline organizations that build data products

🏢 Summary: Senior Mobile Developer role for a large-scale e-commerce mobile application focused on ad delivery and user experience improvements. The position involves designing, developing, and optimizing high-performance Android features while collaborating with cross-functional teams in a fast-paced environment. The offer includes remote work with occasional visits to Warsaw and a high degree of team autonomy. 🗂️ Requirements: 5+ years of commercial Android development experience, Strong Kotlin knowledge, Experience with MVVM, MVI, or Clean Architecture, Experience with REST APIs, Knowledge of asynchronous programming, Ability to write unit and integration tests, Experience with Git, Understanding of software engineering principles, data structures, and algorithms, Experience with CI/CD pipelines, English communication skills 📃 Skills: Kotlin, Android, REST, Git, MVVM, MVI, CI/CD, RxJava, RxKotlin, Coroutines, JetpackCompose 🏢 Description: Salary: 1000 - 1200/ MD + VAT (B2B) Remote: remotely (with occasional visits to the client's office - Warsaw) Why choose this offer? Working in a team you can always count on we have on board top-class specialists and experts in their areas of expertise A high degree of autonomy in terms of organizing your teams work - we encourage you to develop continuously and try out new things Work on a consumer-focused mobile project improving category experience and user interactions, directly impacting business results Project We are looking for a Senior Mobile Developer to support a project for one of Poland’s leading e-commerce platforms. The engineer will work within a team responsible for the technological layer of ad delivery in a large-scale mobile application. You will work closely with product owners, designers, and other engineers to translate user needs into robust, high-performance mobile experiences . This role is ideal for someone with solid experience in mobile development, a strong understanding of software engineering principles, and a desire to grow their expertise in a fast-paced e-commerce environment. What you will be doing on this postion: Design, develop, test, and deploy features, ensuring high quality, performance, and responsiveness Collaborate with product, design, and other engineering teams to define and implement innovative solutions Participate in code reviews, contribute to technical discussions, and help maintain high code quality standards Identify and resolve performance and scalability issues Continuously improve our development processes, tools, and infrastructure Expected competences and knowledge 5+ years of commercial experience in native Android development (Kotlin) Strong understanding o f mobile application architecture patterns (e.g., MVVM, MVI, Clean Architecture) Experience with REST APIs and asynchronous programming Proficiency in writing unit and integration tests Familiarity with version control systems (e.g., Git) Solid understanding of software engineering principles, data structures, and algorithms Experience with continuous integration and continuous delivery (CI/CD) pipelines Good communication skills in English, both written and spoken Nice to have : Experience with high-traffic mobile applications Knowledge of RxJava/RxKotlin, Coroutines, or Jetpack Compose Familiarity with A/B testing Open-source contributions or active GitHub profile Experience in Agile/Scrum environments Technologies you'll work with Kotlin (Android) REST APIs Git Jetpack Compose Coroutines / RxJava Client – why choose this particular client from the Jit portfolio? Our Client dominates the Polish e-commerce arena as the market leader since 1999 . With a user base of over 20 million and growing, this well-established platform is at the forefront of e-commerce, constantly striving for growth through market expansion and investment. As a major player in technology, our Client boasts a talented IT team of over 1,000 employees who focus on developing their own cutting-edge technologies. Jit Team has had a successful partnership with our Client since spring 2021 , with multiple software development teams dedicated to our Client's platforms. These teams operate autonomously, designing platform components through micro-services. Working with our Client offers a chance to contribute to a solution used by millions on a daily basis and to tackle the challenge of delivering software at a massive scale , where even a single second of delay can have a significant impact. This project provides a unique opportunity to work with state-of-the-art technologies and tools, making it a rare and valuable experience. About Jit Team The Human factor of IT - it's not just a slogan, it's a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 700 experienced experts . We create highly specialised teams for clients from all over the world. We offer team members developmental projects, a wide range of benefits and a proprietary professional development programme. Behind our maxim are also charitable and educational activities. We support pupils and students by donating learning equipment. We offer internships to help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We are a Polish company and we share what we have achieved over 15 years of activity . By supporting indigenous initiatives, we ensure the circulation of good energy.

🏢 Summary: Senior Android Mobile Developer role on a large-scale financial/payments platform focused on Token ID Android tools development. The position involves building and enhancing Android applications and backend components in a high-performance, secure, and scalable environment using modern technologies. Hybrid work from Warsaw with a long-term engagement on a globally distributed system. 🗂️ Requirements: Minimum 7+ years of experience in Android development, Strong experience with backend development using Spring Boot, Hands-on experience with Kubernetes and Docker, Experience with Jenkins for CI/CD, Proficiency in Java 21, Experience with SQL databases, Experience building and consuming REST and Web Services, Experience with IntelliJ, Experience with GenAI tools including Claude Code, Ability to develop and integrate Android applications with backend services 📃 Skills: Android, Java, SpringBoot, Kubernetes, Docker, Jenkins, IntelliJ, SQL, REST, WebServices, GenAI, Claude, CI/CD 🏢 Description: Senior Android Mobile Developer 📌 We’re looking for an experienced Senior Android Mobile Developer to join a fast-paced, high-impact project in the financial / payments domain. You’ll be working on a large-scale, globally distributed platform that processes millions of transactions and powers critical payment flows used worldwide. The project focuses on performance, security, and scalability, with strong engineering standards and modern technologies. 📍 Hybrid from Warsaw - 2-3 days per week Role Details: Duration: Minimum 6 months and will be extended Years of exp: Minimum 7+ Years Details about the project they would be working on: Token ID Android Tools development Job description: Mandatory skills : Android Development, Spring boot, k8s, Docker, Jenkins, IntelliJ, claude code, GenAI, Java 21, SQL, rest, Web Services Roles and Responsibilities: Develop and maintain new features for Android test tools and their backend components. Contribute to the design, development, and enhancement of various Android‑based tool applications used within the Token ID ecosystem. Deliver the following engagement components: Issuer Mobile Application TR Mobile Application Terminal Mobile Application Demo Wallet Ensure high‑quality code, performance optimization, and smooth integration with backend services. Collaborate with cross‑functional teams to support the full development lifecycle, including design, development, testing, and deployment. Troubleshoot issues, debug applications, and contribute to continuous improvements. ✅ Benefits: Work with modern technologies and international teams Long-term and stable cooperation Professional growth opportunities 📩 If you’re interested and meet the qualifications, please send your CV to Alina Pchelnikova at alina.pchelnikova@dcvtechnologies.co.uk

🏢 Summary: Remote B2B role for a Mobile Developer to build and optimize advertising components in a large-scale Android e-commerce application. The position focuses on native Android development combined with WebView-based ad integrations in a performance-critical environment. You will ensure high app performance while integrating JavaScript-driven advertising solutions. 🗂️ Requirements: 3+ years commercial experience in native Android development with Kotlin, Strong knowledge of mobile architecture patterns (MVVM, MVI, Clean Architecture), Hands-on experience with Android WebView and native-to-web communication, Solid knowledge of JavaScript, HTML and CSS, Experience with REST APIs and asynchronous programming, Ability to write unit and integration tests, Strong understanding of software engineering principles, Knowledge of data structures and algorithms 📃 Skills: Kotlin, Android, WebView, JavaScript, HTML, CSS, REST, Git, MVVM, MVI, CleanArchitecture, Asynchronous, UnitTesting, IntegrationTesting, DataStructures, Algorithms 🏢 Description: Salary: 960 - 1200 PLN/MD + VAT (B2B) Work Model: remote Why choose this offer? Impact on the development of the largest e-commerce system in Poland You can expect a flexible work organization The Jit community will bring you a nice time during regular integration meetings Project We are looking for a Mobile Developer to support a project in the Advertising domain for one of Poland’s leading e-commerce platforms. The engineer will work within a team responsible for the technological layer of ad delivery in a large-scale mobile application. You will contribute to building and optimizing advertising components in a performance-critical environment, balancing monetization goals with excellent user experience. This includes ensuring that advertising scripts and integrations do not negatively impact application performance (e.g., blocking the main thread). We are looking for a hybrid-minded developer who understands both native mobile development and web-based ad technologies—especially JavaScript execution within WebView contexts—while maintaining a strong foundation in the native Android stack. Expected competences and knowledge 3+ years of commercial experience in native Android development (Kotlin) Strong understanding o f mobile application architecture patterns (e.g., MVVM, MVI, Clean Architecture) Hands-on experience with Android WebView , including native-to-web communication Solid understanding of JavaScript, HTML, and CSS Experience with REST APIs and asynchronous programming Ability to write unit and integration tests Strong understanding of software engineering principles, data structures, and algorithms Proactive problem-solving mindset and passion for building high-quality user experiences (UX) Nice to have : Experience with high-traffic mobile applications Knowledge of RxJava/RxKotlin, Coroutines, or Jetpack Compose Familiarity with A/B testing Open-source contributions or active GitHub profile Experience in Agile/Scrum environments Technologies you'll work with Kotlin (Android) JavaScript HTML / CSS Android WebView REST APIs Git Jetpack Compose Coroutines / RxJava Client – why choose this particular client from the Jit portfolio? Our Client dominates the Polish e-commerce arena as the market leader since 1999 . With a user base of over 20 million and growing, this well-established platform is at the forefront of e-commerce, constantly striving for growth through market expansion and investment. As a major player in technology, our Client boasts a talented IT team of over 1,000 employees who focus on developing their own cutting-edge technologies. Jit Team has had a successful partnership with our Client since spring 2021 , with multiple software development teams dedicated to our Client's platforms. These teams operate autonomously, designing platform components through micro-services. Working with our Client offers a chance to contribute to a solution used by millions on a daily basis and to tackle the challenge of delivering software at a massive scale , where even a single second of delay can have a significant impact. This project provides a unique opportunity to work with state-of-the-art technologies and tools, making it a rare and valuable experience. About Jit Team The Human factor of IT - it's not just a slogan, it's a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 700 experienced experts . We create highly specialised teams for clients from all over the world. We offer team members developmental projects, a wide range of benefits and a proprietary professional development programme. Behind our maxim are also charitable and educational activities. We support pupils and students by donating learning equipment. We offer internships to help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We are a Polish company and we share what we have achieved over 15 years of activity . By supporting indigenous initiatives, we ensure the circulation of good energy.

🏢 Summary: Senior iOS Mobile Developer role focused on advertising technology within a large-scale e-commerce mobile application. The position involves integrating and optimizing ad formats, supporting video ad delivery, debugging native-to-web communication, and ensuring high performance and privacy compliance in a fully remote B2B environment. The role requires strong expertise in Swift, WebKit, JavaScript, and modern mobile architecture patterns. 🗂️ Requirements: 5+ years of commercial experience in native iOS development with Swift, Knowledge of MVVM, MVI, and Clean Architecture, Experience with WebKit and WKWebView, Knowledge of JavaScript, HTML, and CSS, Experience with RESTful APIs and asynchronous programming, Ability to write unit and integration tests, Knowledge of Git version control, Understanding of software engineering principles, data structures, and algorithms, Experience with reactive programming, Knowledge of Jetpack Compose and coroutines, Experience with A/B testing frameworks, Experience working in Agile/Scrum environments 📃 Skills: iOS, Swift, JavaScript, WebKit, WKWebView, HTML, CSS, REST, Git, MVVM, MVI, RxJava, RxKotlin, Combine, Compose, Coroutines, Agile, Scrum 🏢 Description: Salary: 1000 - 1200 PLN/day on B2B Remote: 100% Remote Why choose this offer? Impact on the development of the largest e-commerce system in Poland You can expect a flexible work organization Long-term cooperation within a stable ecosystem The Jit community will bring you a nice time during regular integration meetings Project The engineer assigned to the project should understand the intersection of Native Mobile development and the dynamic AdTech environment. The ideal consultant is someone who recognizes that in-app advertising is not just an "image," but a complex ecosystem built on IAB (Interactive Advertising Bureau) standards. Performance & UX Mindset: They must be able to balance business objectives (monetization) with user experience, ensuring, for example, that advertising scripts do not block the application's main thread. Hybrid Developer (iOS Developer with JavaScript knowledge): The candidate should be comfortable using JavaScript within WebViews to understand why an ad creative may not be reporting events correctly, while still maintaining a strong foundation in the native technology stack. We are looking for a Senior Mobile Developer to provide project support in the Advertising domain. Your specialist will support a team responsible for the technological aspects of ad delivery and display within mobile application. Responsibilities: Integracja i rozwój komponentów reklamowych: Implementacja nowych formatów reklamowych (np. wideo, display, native ads) bezpośrednio w głównej aplikacji Integration and development of advertising components: Implementation of new advertising formats (e.g. video, display, native ads) directly within the main application Video Ad Stack support: Optimising video ad playback, ensuring smooth transitions and correct triggering of tracking events. Cross-team collaboration: Working closely with Core Mobile teams to ensure consistency with the app’s architecture and the highest standards of security and performance. Privacy management (Compliance): Implementing and maintaining data privacy solutions, such as GDPR consent management (CMP), and adapting to changes in systems. Debugging ‘difficult cases’: Analysing and resolving issues at the interface between the app’s native code and external advertising libraries (SDKs) and web creatives. Frontend/Backend support: Actively participating in the design of solutions that require communication between the mobile app and advertising systems. Experience working with large-scale, high-traffic mobile apps. Knowledge of reactive programming (e.g. RxJava/RxKotlin, Combine). Knowledge of Jetpack Compose and coroutines. Experience working with A/B testing frameworks. Contributions to open-source projects or a strong GitHub profile. Experience working in an Agile/Scrum environment Expected competences and knowledge Over 5 years’ commercial experience in developing native mobile applications for iOS (Swift). In-depth understanding of mobile application architecture patterns (e.g. MVVM, MVI, Clean Architecture). Practical experience with WebKit and WKWebView, including in the area of native-to-web communication (e.g. handling JS messages via WKScriptMessageHandler and invoking JavaScript code). Solid knowledge of JavaScript and core web technologies (HTML/CSS) to effectively integrate and debug web-based advertising content. Experience working with RESTful APIs, asynchronous programming and efficient data processing. Proficiency in writing unit and integration tests. Knowledge of version control systems (e.g. Git). A solid understanding of software engineering principles, data structures and algorithms. A proactive approach to problem-solving and a passion for creating excellent user experiences (UX). Technologies you'll work with iOS Swift JavaScript WebKit REST API Client – why choose this particular client from the Jit portfolio? Our Client dominates the Polish e-commerce arena as the market leader since 1999 . With a user base of over 20 million and growing, this well-established platform is at the forefront of e-commerce, constantly striving for growth through market expansion and investment. As a major player in technology, our Client boasts a talented IT team of over 1,000 employees who focus on developing their own cutting-edge technologies. Jit Team has had a successful partnership with our Client since spring 2021 , with multiple software development teams dedicated to our Client's platforms. These teams operate autonomously, designing platform components through micro-services. Working with our Client offers a chance to contribute to a solution used by millions on a daily basis and to tackle the challenge of delivering software at a massive scale , where even a single second of delay can have a significant impact. This project provides a unique opportunity to work with state-of-the-art technologies and tools, making it a rare and valuable experience. About Jit Team The Human Factor of IT - it’s not just a slogan, it’s a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 770 experienced experts , to whom we offer developmental projects, a wide range of benefits, and a proprietary professional development programme. Together with clients from around the world, we create innovative IT solutions delivered by highly specialised and efficient teams. Behind our maxim are also charitable and educational activities. We support schools, universities, and educational institutions by conducting workshops, running educational projects, sponsoring events, and donating learning equipment. We offer internships that help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We also support numerous charitable organisations helping people in need, children, and the elderly. We are a Polish company and we share what we have achieved over more than 15 years of activity. By supporting local initiatives, we contribute to the circulation of good energy.

🏢 Summary: Backend Software Engineer role focused on building and scaling a high-traffic mobile advertising exchange that processes hundreds of thousands of real-time auction requests per second. The position involves full lifecycle development of distributed, low-latency microservices written in functional Scala and deployed to production. Engineers design, implement, test, and optimize backend systems for high availability and performance. 🗂️ Requirements: BS in Computer Science or related field, 6+ years of software engineering experience, 2+ years of Scala programming experience, Experience with Java or Python, Hands-on experience with microservices architecture, Experience building high-traffic, high-availability systems, Experience with Agile development, Ability to design, implement and test backend systems, Experience troubleshooting application and infrastructure issues, Experience writing unit tests 📃 Skills: Scala, Java, Python, Microservices, MongoDB, Bigtable, Aerospike, Kafka, PubSub, AWS, GCP, Git, Bitbucket, ProtocolBuffers, NoSQL 🏢 Description: LoopMe is the leading in-app monetization and programmatic advertising platform. We reach a mobile audience of over 900 million monthly unique users globally and process over 200 billion ad requests. The Chartboost SDK is the highest-integrated independent mobile ad SDK and through the Chartboost Exchange, Ad Network and other services, we empower mobile app developers to build businesses while connecting advertisers to highly engaged audiences. What we need: We are looking for a backend software engineer to join our exchange team and help us build the best advertising platform for mobile developers. You'll work on a system that processes hundreds of thousands of requests per second and conducts a real-time auction to find and deliver the most effective ads from our global partners. We trust our engineers to own this critical system and handle the full life cycle of feature development, from initial design all the way to shipping into production. Our system is written in functional Scala and has plenty of opportunities to flex your distributed, low-latency programming muscle, using technologies like mongoDB, protocol buffers and others. What you’ll be doing: Responsible for designing, implementing and testing the functionality of our Exchange product Work effectively with other engineers, system architects, and Operations teams to implement enhancements and issue resolutions Participate in technical discussions; come up with innovative ways to improve the product and process Troubleshoot issues with application, technologies, and infrastructure Continuously improve your technical knowledge Think creatively and work independently - collaborating with others as needed to maximize efficiency and throughput Deliver quality work on time while driving developer productivity across the organization You’re the type of engineer that appreciates clean code and has experience in writing unit tests to keep the utmost in code quality Qualifications: BS in Computer Science or related field 2+ years of Scala programming experience, along with experience in other programming languages such as java, or python. 6+ years of software engineering experience You have an understanding of microservices and hands-on experience implementing them You are experienced with software development in high-capacity, high-traffic, high-availability websites/systems You have experience working with Agile development The following experience would be a plus: Advertising technology experience Experience with Python or Java NoSQL databases (MongoDB, Bigtable, Aerospike etc) Distributed messaging services, like Kafka, PubSub Strong skills in Data Engineering Experience Managing Cloud infrastructure (AWS or GCP) Familiarity with Git and/or Bitbucket Benefits: International work environment Flexible working schedule with a hybrid working model (3 days from the office) Annual performance bonus (up to 8%) One month of workation (work from any location worldwide for one month) Multikafeteria

🏢 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!