Rakuten Viber

Machine Learning Engineer

• Enhance and extend our machine learning framework to incorporate features like LLM observability, Feature Store, and SageMaker serving.
• Provide technical guidance and support to enable data scientists to effectively utilize the framework.
• Collaborate with cross-functional teams to develop advanced machine learning based recommendation systems.

Social Media Manager

• Develop and own global social strategies (organic + paid) aligned with business goals.
• Plan, create, and publish content across diverse social channels.
• Lead creative campaigns and activations - launches, special events, brand initiatives, UGC.
• Collaborate with design, marketing, and performance teams to ensure cohesive storytelling.
• Engage and grow online communities through authentic interaction.
• Monitor performance, analyze insights, and optimize content for growth.
• Manage partnerships with stakeholders, creators, and influencers.
• Stay ahead of social trends, algorithms, and emerging platforms.

Data Analyst

• Identify opportunities for improvement through data analysis aligned with company strategy.
• Partner cross-functionally to translate data findings into actionable product and business decisions.
• Design, run, and analyze A/B tests to evaluate product changes and user experience optimizations.
• Build, automate, and maintain dashboards and reports to track platform health, user behavior, and key trends.
• Communicate findings clearly to stakeholders, influencing both tactical and strategic decisions.
• Leverage AI and automation tools to accelerate analytical workflows and uncover deeper insights.

Senior Data Analyst

Business Development Rep

• Secure partners for our Rewards hub, ensuring a diverse and valuable offering for our users.
• Initiate, structure, negotiate, and close partnership deals.
• Define business needs, build business cases and pre-evaluate various offers' value.
• Proactively identify and prospect new partnerships across the fintech landscape that drive long-term value and align with our Global Fintech BD strategy.
• Surface areas for new opportunities with existing partners.
• Build and sustain strong relationships with business decision-makers and internal stakeholders.
• Lead the BD efforts on the ground and update the Global Fintech BD team (and wider business) on current partnerships and pipeline.
• Manage all partnership reporting to generate insights and learnings for each campaign.

Business Development Manager

Customer Support

• Keeping Viber users happy and loyal by providing efficient responses to the worldwide Viber community queries
• Provide fast and professional off-line (Email, live-chat) response to users issues
• Maintain a high level of users satisfaction
• Investigate the problematic issues reported by users: collect relevant information, analyze and document it in internal articles
• Identify and report on trends, repeated issues and urgent bugs.

Customer Support Specialist, Ukrainian Speaking

• Provide fast and professional off-line (Email, live-chat) response to users issues
• Maintain a high level of users satisfaction
• Investigate the problematic issues reported by users: collect relevant information, analyze and document it in internal articles
• Identify and report on trends, repeated issues and urgent bugs.

Product Manager

• Drive the strategy, roadmap, and execution of Viber’s platforms across mobile and desktop clients, in close collaboration with the R&D team.
• Partner with Engineering, Analytics, Business leadership to define and deliver a product vision that balances user needs, business growth, and technical opportunities.
• Own the measurement and improvement of technical performance and usability across platforms.
• Scale usage, retention, user satisfaction, and monetization through scaling experiences across platforms.
• Define, monitor, and analyze Key Performance Indicators (KPIs) and Service Level Objectives (SLOs) for your products and use this data to make trade-off decisions and drive continuous improvement.

Product Manager – Platform

Human Resources

• Work closely with leaders at all levels to design and implement HR strategies that align with business objectives and drive organizational success
• Serve as a trusted advisor to managers offering guidance, coaching, and support
• Partner with international managers to strengthen leadership skills, support team development, and advise on day-to-day management challenges
• Manage employee-related matters throughout the entire employee journey, from onboarding to offboarding
• Lead initiatives to foster employee engagement and wellbeing, including onboarding experiences, team-building events, celebrations, and volunteer activities
• Build strong relationships across the organization, collaborating with Talent Acquisition, Finance, Office Manager, People Analytics and global HRBPs to deliver people initiatives

HR Business Partner

• Identify improvement areas through data analysis, aligned with the company’s strategic vision and goals.
• Collaborate with cross-functional teams to translate data findings into business strategies.
• Define, conduct and analyze A/B tests to evaluate the effectiveness of different product initiatives.
• Developing and monitor dashboards and reports that provide visibility into platform health, user behavior, and key usage trends for stakeholders.

Senior Data Analyst, Dating

Sales

• Support Rakuten Viber strategic clients in Ukraine as Sales Manager for Business Messaging
• Create compelling, value-driven business cases demonstrating impact of Viber Business Messaging
• Establish strong connections with business, technical, customer experience, and marketing leaders to position Viber Business Messaging
• Develop deep understanding of partners' business objectives and align Viber solutions to drive outcomes
• Develop strategies to manage sales pipelines, forecast, assess risks, and meet revenue goals
• Leverage existing solutions and collaborate with partners to build customized solutions
• Collaborate with Support & Engineering teams to troubleshoot issues and remove blockers
• Provide insights to product and engineering teams to close product gaps and unlock market opportunities
• Drive growth, optimize solutions, and ensure customer success

Sales Manager

Backend Engineer

• Develop and maintain high-availability Java applications that can be high-volume and low-latency.
• Work on high-traffic systems handling over 1 billion messages a day and dozens of scalable services.
• Develop new features, optimize performance, ensure data security, and solve complex technical challenges within a microservices architecture.
• Use non-blocking and reactive approaches, Cloud services, and NoSQL databases.
• Plan, design, define application objectives and functionality, and ensure designs conform with business goals.
• Support continuous improvement, investigate alternatives and technologies, and present for architectural review.
• Work closely with Product and Architects teams on large mission-critical systems in a highly motivated team.

Backend Developer, Java

• Planning, designing, developing and maintaining Java high-availability applications that can be high-volume and low-latency.
• Define application objectives and functionality.
• Ensure application designs conform with business goals.
• Support continuous improvement, investigating alternatives and technologies, and presenting for architectural review.
• Work in a highly motivated team, closely with Product and Architects teams on large mission-critical systems.
• Develop and maintain high-traffic systems (over 1 billion messages a day) and dozens of scalable services.
• Develop new features, optimize performance, ensure data security, and solve complex technical challenges within microservices architecture using Java, non-blocking/reactive approaches, Cloud services, and NoSQL databases.

Account Manager

• Manage a portfolio of Business Messaging and Chatbot partners with a focus on the Ukrainian market.
• Oversee the entire partner lifecycle, including onboarding, day-to-day account management, performance monitoring, and growth strategy execution.
• Build and maintain strong, long-term relationships with partners, acting as a trusted advisor and key point of contact.
• Collaborate with internal teams — including Sales, Marketing, and Product — to support partner enablement and integration.
• Coordinate partner training sessions, marketing initiatives, and operational support as needed.
• Analyze partner performance using internal reporting tools and provide regular business reviews (monthly/quarterly).
• Detect and resolve reporting discrepancies; ensure data accuracy in partner performance tracking.
• Clearly communicate Viber’s product offerings, features, and value propositions to both technical and non-technical stakeholders.
• Proactively identify opportunities to upsell and cross-sell Viber solutions to existing partners.

Business Messaging Account Manager

Customer Success Manager

• Provide technical support to key accounts and business partners
• Support business partners' tickets over email
• Investigate and troubleshoot reported technical issues
• Manage escalations of issues to relevant R&D teams
• Support internal teams' operational processes and requirements
• Work with Product and Business teams to convey partners' requirements and business needs
• Ensure efficient and high-performing operational tools and processes for customers, partners, and business unit team members

Customer Success Specialist

• Lead the development and optimization of spam and fraud detection systems using machine learning and rule-based engines.
• Work closely with management, product, engineering, compliance, legal, and security teams to align, present, and implement end-to-end fraud solutions.
• Ensure adherence to KYC, AML, and other financial regulations while managing fraud risks.
• Leverage the extensive data received from our application to enhance model performance and accuracy.

Director, Data Analytics – Risk and Fraud

• Planning, designing, developing and maintaining Java high-availability applications that can be high-volume and low-latency.
• Define application objectives and functionality.
• Ensure application designs conform with business goals.
• Support continuous improvement, investigating alternatives and technologies, and presenting for architectural review.
• Work in a highly motivated team, closely with Product and Architects teams on large mission-critical systems.
• Develop and maintain high-traffic systems (over 1 billion messages a day) and dozens of scalable services; ensure fast and reliable platform operation.
• Develop new features, optimize performance, ensure data security, and solve complex technical challenges within microservices architecture using Java, non-blocking/reactive approaches, Cloud services, and NoSQL databases.

Java Developer

• Develop and maintain high-traffic backend services handling over 1 billion messages a day and dozens of scalable services.
• Planning, designing, developing and maintaining Java high-availability applications that can be high-volume and low-latency.
• Develop new features, optimize performance, ensure data security, and solve complex technical challenges within a microservices architecture.
• Use Java with non-blocking and reactive approaches, Cloud services, and NoSQL databases.
• Define application objectives and functionality and ensure application designs conform with business goals.
• Support continuous improvement, investigate alternatives and technologies, and present for architectural review.
• Work closely with Product and Architects teams in a highly motivated team on large mission-critical systems.

• Lead the development and optimization of spam and fraud detection systems using machine learning and rule-based engines.
• Work closely with management, product, engineering, compliance, legal, and security teams to align, present, and implement end-to-end fraud solutions.
• Ensure adherence to KYC, AML, and other financial regulations while managing fraud risks.
• Leverage the extensive data received from our application to enhance model performance and accuracy.
• Research and develop deep learning models to identify bad actors, prevent fraud, build anomaly detection models, and perform analytics at high scale.
• Create alignment across different divisions, focus on strategic business KPIs, and lead other managers to collaborate and perform shared goals.
• Deliver outcomes that significantly impact the business by deploying solutions to production and measuring proven impact.

Director, Data Analytics – Risk & Fraud

Android Engineer

• Participate in the development of the Viber client for Android, contributing to the enhancement and maintenance of existing features
• Collaborate with a diverse team of developers to efficiently produce new features and contribute to overall application improvements
• Quickly grasp clients’ requirements, technology needs, and solution architecture to deliver high-quality solutions
• Work closely with product managers, the design team, and others to develop appropriate solutions that align with user experience and design guidelines
• Deliver high-quality Android product to millions of users

Android Developer

QA Engineer

• Develop manual test scenarios and test suites.
• Maintain test documentation.
• Validate new functionality and ensure the flawless testing process.
• Create and maintain test documentation including test cases, checklists, test plans.
• Work with the product owner to ensure requirements are captured correctly; work with the development team to analyze and resolve defects.
• Report over the manual testing results and possible risks.
• Support the full cycle of defect tracking & management.
• Functional API testing.
• Collaborate with development teams and quality engineering team to identify and prioritize opportunities for automation.

Mobile QA Engineer

iOS Engineer

• Design and development of Viber iOS client.
• Development of new features of Viber app.
• Improve code quality through writing unit tests and performing code reviews.
• Improve quality of application and bug fixing.
• Applications optimization and Code refactoring.
• Collaborate with cross-functional teams (support, product management, developers).

Machine Learning Engineer

Social Media Manager

Senior Data Analyst

Business Development Manager

Customer Support Specialist, Ukrainian Speaking

Customer Support Specialist, Ukrainian Speaking

Product Manager – Platform

HR Business Partner

Senior Data Analyst, Dating

Sales Manager

Backend Developer, Java

Backend Developer, Java

Business Messaging Account Manager

Customer Success Specialist

Director, Data Analytics – Risk and Fraud

Java Developer

Java Developer

Director, Data Analytics – Risk & Fraud

Android Developer

Mobile QA Engineer

Senior iOS Developer