Jobs at Djinni

We are looking for a Technical Support Manager (L1) to provide high-level assistance to our customers and partners. This role includes diagnosing and troubleshooting software issues, as well as configuring customer and provider accounts, including AI models.

📌 Please note: This position requires working night shifts, including:

One shift from 11:00 PM to 8:00 AM (23:00 – 08:00)
One shifts from 10:00 PM to 7:00 AM (22:00 – 07:00)
 

Primary responsibilities of a Technical Support Manager:
- Diagnose and troubleshoot technical issues, including account setup;
- Ask customers targeted questions to quickly understand the root of the problem;
- Guide clients and providers through issue resolution via phone, email, or chat;
- Properly escalate unresolved issues to appropriate internal teams;
- Provide prompt and accurate feedback to customers;
- Oversee the integration pipeline;
- Configure provider and client accounts;

- Utilize AI models to automate issue diagnostics, analyze client data, and optimize support processes.

Requirements & Skills

- Proven work experience as a Technical Support Engineer, Desktop Support Engineer, IT Help Desk Technician or similar role;

- Ability to diagnose and troubleshoot basic technical issues;

- Experience working with AI models for data analysis, process automation, or customer support;

- Excellent problem-solving and communication skills;

- Excellent skills in SQL;

- Ability to provide step-by-step technical help, both written and verbal;

- BS degree in Information Technology, Computer Science, or relevant field.

Probation

- Standard probation — 3 months (may be exceptional cases)

Hi! We are Liven. We develop a global ecosystem of products that help people gain self-observability and steer away from negative thoughts, patterns, and behaviors on their personal journey.

Our UX Research team is the compass of our product development. We don’t rely on assumptions; we dive deep into real user insights to guide our decisions. As we scale, we are looking for two Junior UX Researchers to join our mission. This is a perfect starting point for those looking to pivot into IT and build a meaningful career in UX Research within a product-driven environment.

Important! Given the requirement for frequent interaction with users, the core working hours for this role will typically be 14:00 to 00:00.
 

🎯 How Will You Make An Impact?

• End-to-end Research: Participate in the full UX research cycle under the mentorship of our Lead UX Researcher — from defining research questions to presenting actionable insights.
• Qualitative Exploration: Assist in planning and conducting user interviews, usability testing, concept testing, and discovery research.
• Data Synthesis: Work with quantitative data, analyzing survey results and behavioral metrics alongside our analytics team.
• Insight Generation: Transform raw data into structured insights and clear product recommendations.
• Market Intelligence: Conduct desk research and competitive analysis to identify new growth opportunities for our ecosystem.
• Hypothesis Testing: Learn to formulate research hypotheses and help product teams validate them through rigorous testing.
• Continuous Growth: Rapidly immerse yourself in new domains, decode user behavior, and sharpen your research expertise through constant feedback.

🧩 What Makes You a Perfect Fit?

• Language Proficiency: English at a C1 level or higher (most of our research and internal communication happens in English).
• Analytical Mindset: Strong critical thinking skills with the ability to question assumptions and identify cause-and-effect relationships.
• Information Management: Ability to process, structure, and synthesize large volumes of information.
• Empathy & Curiosity: A genuine interest in human behavior, motivations, and decision-making processes.
• Agility: Readiness to learn fast, embrace constructive feedback, and adapt to a high-paced environment.
• Communication: Ability to clearly articulate thoughts and argue conclusions based on evidence.

🌱 Even Better If You:

• Have experience in any type of research (sociological, psychological, academic, or marketing).
• Possess a background in marketing, market research, or research agencies.
• Have a degree in Sociology, Psychology, Economics, or related fields.
• Understand the basic principles of UX, product management, or customer experience.
• Are a "switcher" who has proactively mastered the basics of the UX Research profession.

💪🏻 What will you enjoy most about being at Liven?

• Culture of Curiosity: A place for explorers who embrace the unknown and achieve stellar results even when there’s no playbook.
• Growth through Impact: Your professional evolution is directly tied to the value you bring to the product and the business.
• Global Impact: Develop a product that supports the mental well-being of millions of users worldwide every day.
• Trust and Ownership: The freedom to act, coupled with high responsibility for the outcome.
• Expert Community: Access to professional clubs, specialized training, a knowledge base, and a library for your continuous learning.
• Space for Focus: Autonomous offices in Kyiv and Warsaw with breakfasts, lunches, lounge areas, and wellness zones.
• Well-being Program: We care about the mental health of our team as much as we care about our users, including medical insurance and sports communities.
• Support during the war: We provide conditions for stable work and contribute to Ukraine's recovery through the SKELAR foundation.

Still on Day 1: A Constant Expedition We keep the "Day 1" spirit — constantly asking questions, testing hypotheses, and adapting. If you are driven by curiosity and want to help users understand themselves better through research, let’s connect.

Fuel your curiosity at Liven 🔎

An ambitious SBSB FinTech Lawyers company that combines advanced financial technology and legal knowledge is looking for a sales manager!

We help clients navigate the complex world of finance and law by providing innovative solutions in leading industries.

Main responsibilities:

1. Searching for and attracting new clients, maintaining the interest of existing users.
2. Initiating the first contact with potential clients through various channels.
3. Conducting negotiations and presentations for clients together with lawyers.
4. Closing deals.
5. Initiation of activities to increase sales.
6. Regular attendance at industry events and conferences to expand the network, find clients and partners.

7. Active use of social networks. Development of publications on LinkedIn and involvement of other advertising methods.

    

Requirements for the candidate:

1. Understanding and use of CRM systems for customer relationship and data management.
2. Experience in B2B sales.
3. Proven successful experience in cold sales, confirmed by specific results.
4. Ability to negotiate at various levels, including closing deals.
5. B2+ English language skills.
6. In-depth knowledge of the company’s market and products and services will be an advantage.

7. Ability to use various programs and tools.

    

We offer:

1. Remote format of cooperation.
2. Horizontal and vertical growth opportunities.
3. Competitive salary - fix+bonus.
4. Access to the company’s training programs.

5. Comprehensive health insurance.

    

Become a part of our dynamic and friendly team!

An ambitious SBSB FinTech Lawyers company that combines advanced financial technology and legal knowledge is looking for a PR manager!

We help clients navigate the complex world of finance and law by providing innovative solutions in leading industries.

Main responsibilities:

• Development and implementation of PR strategy.
• Preparation of media materials: portfolio with a relevant content, press releases, articles, comments; identification of relevant publications; monitoring of current platforms.
• Interaction with journalists, media outlets, and bloggers.
• Organization and coordination of the company’s participation in events.
• Monitoring of brand mentions; reputation management.
• Content management for external communications and social media.
• Reporting on PR activities.

• Management of the company’s social media accounts to enhance brand development.

   

Requirements for the candidate:

• Over 2 years of PR experience (agency or in-house).
• Experience collaborating with business media (finance, business, crypto, etc.) and organizing events.
• Bachelor’s degree in PR, Journalism, Marketing, or Philology.
• English proficiency at an upper-intermediate (B2+) level.
• Proficient in media monitoring and analytical tools.
• Basic experience in managing social media and developing content.

• Will be well privileged if you Proficient in major platforms (Linkedin, YouTube, Instagram, Facebook, etc.) and skilled in utilizing promotional tools and had experience in promoting and developing an employer’s personal brand.

   

We offer:

• Remote format of cooperation;
• Horizontal and vertical growth opportunities;
• Competitive salary;
• Access to the company’s training programs;
• Comprehensive health insurance.

An ambitious SBSB FinTech Lawyers company that combines advanced financial technology and legal knowledge is looking for a Junior SM !

We help clients navigate the complex world of finance and law by providing innovative solutions in leading industries.

Requirements:

• English proficiency B1+ (written communication)
• Experience with CRM systems
• LinkedIn proficiency for client prospecting
• Skills in working with ChatGPT and other AI tools
• Ability to work with email marketing tools
• Basic understanding of sales funnel
• Strong communication skills and ability to build rapport
• Results-oriented mindset
• Attention to detail

• Team player

   

Responsibilities:

• Scheduling meetings with potential clients and partners at conferences (cold outreach via LinkedIn, conference apps, niche chats)
• Daily posts about company services in niche chats and social media
• Competitor analysis
• Processing registries and offering services to clients

• Qualifying inbound leads (in the future)

   

We offer:

• Remote format of cooperation.
• Horizontal and vertical growth opportunities.
• Competitive salary.
• Access to the company’s training programs.
• Comprehensive health insurance.

Location: Remote or office in Dnipro
Product company

About the role
We are looking for a Middle engineer with a strong debugging mindset who enjoys investigating issues, finding root causes, and improving product stability.
This role combines development and production problem-solving.
You’ll work with real incidents, analyze system behavior, fix bugs in backend and frontend, and grow into a full product developer inside the team.

Responsibilities:
- Investigate and resolve production and staging issues
- Analyze logs and identify root causes
- Reproduce and describe bugs
- Fix issues in Python backend and Vue.js frontend
- Work with SQL for troubleshooting and data analysis
- Collaborate with: developers, QA, support

Must have:
- Python: 2+ years of commercial experience
- Vue.js: working experience
- MongoDB / Redis / ClickHouse / MySQL: strong hands-on experience (data analysis, troubleshooting)
- REST API: production experience
- Client–server architecture: solid practical understanding
- Debugging & root cause analysis: strong practical experience
- Log analysis: experience working with production logs
- Git: confident daily usage

Nice to have:
- Incident handling / L2 support: experience investigating production issues
- Docker: working knowledge
- Monitoring & error tracking tools (e.g. Sentry, Grafana, Prometheus): hands-on experience
- CI/CD: basic understanding
- Experience working with production environments

What we offer:
- Salary up to $2500
- Remote work or office in Dnipro — you choose
- Flexible working hours with a focus on team overlap (UA time zone)
- No on-call duties
- Flexible workflow and no micromanagement

Growth & development:
- Clear growth path to a full product developer
- Mentorship and regular code reviews
- Hands-on experience with real production cases and incident investigation
- Opportunity to work across backend and frontend

Our Customer:

A global technology company developing real-time video augmentation and rendering infrastructure for broadcast and streaming environments.

Your tasks:

• Develop and maintain the backend pipeline to monitor, synchronize, and manage data workflows both in the cloud and on on-premises servers.
• Integrate and manage modules written in C++ and Node.js to ensure seamless system performance.
• Implement a robust metadata system on AWS, ensuring secure access to S3 and optimized performance.
• Design and implement scalable backend architecture (Node.js) for efficient data distribution and pipeline control.
• Build and maintain a user-friendly monitoring dashboard to track pipeline status and performance in real-time.

Required Experience and Skills:

• Over 10 years of experience in backend development
• Proficient in Node.js and AWS
• Strong expertise in designing large-scale client-server architectures
• Deep understanding of browser internals, including rendering, JavaScript execution, network requests, memory management, and security mechanisms
• English – Upper-Intermediate

Would be a plus:

• Experience in database management, especially MySQL
• Experience in real-time C++ programming
• Experience in sports broadcasting and augmented reality (AR) technologies

Our customer:

A B2B SaaS platform for automating sales, contracts, and revenue. The platform unifies the entire deal lifecycle — from quote creation to revenue recognition.

Your Tasks:

• Collaborate with engineering teams to design, implement, and maintain reliable and scalable infrastructure.
• Manage and troubleshoot Kubernetes clusters in cloud environments (AWS, Azure, or GCP).
• Maintain and optimize containerized workloads, including Helm charts and CI/CD pipelines.
• Write scripts to automate operational tasks using Bash, Python, or Go.
• Monitor production systems and implement observability solutions using Prometheus, Grafana, and OpenTelemetry.
• Conduct root cause analysis for incidents and implement preventative measures.
• Continuously improve deployment workflows, production reliability, and operational efficiency.

Required Experience & Skills:

• 3+ years of professional experience in DevOps or Site Reliability Engineering roles.
• Hands-on experience with Kubernetes administration.
• Hands-on experience with troubleshooting in cloud environments.
• Experience managing containerized workloads and maintaining Helm charts.
• Solid understanding of CI/CD principles and tools (e.g., Jenkins, GitLab CI, GitHub Actions).
• Proficiency in scripting languages such as Bash, Python, or Go.
• Knowledge of monitoring and observability ecosystems (Prometheus, Grafana).
• Experience of distributed tracing with OpenTelemetry.
• Strong collaboration and communication skills within engineering teams.
• Strong problem-solving skills with a proven track record of performing root cause analysis.
• Good command of English (written and spoken).

Would Be a Plus:

• Experience running, deploying, and debugging Java applications in production.
• Proficiency with Java build tools (Maven or Gradle) and CI pipeline optimization.
• Understanding of JVM fundamentals (memory management, garbage collection).
• Experience maintaining and scaling Elasticsearch clusters.
• Experience managing MongoDB in production environments.

Our Customer:

Our client is a fast-growing tech company that builds innovative web solutions. They are looking for a talented Front-end Developer to design and deliver impactful features, contribute to new services, and help advance their platform. The team values collaboration, learning, and continuous innovation.

Your tasks:

• Develop and maintain Angular-based web applications.
• Implement testing best practices to ensure high-quality code.
• Identify performance bottlenecks and optimize front-end functionality.
• Collaborate closely with backend services and APIs.
• Mentor junior developers and help grow the frontend team.
• Work alongside product managers and senior leadership to deliver features.
• Ensure high availability and reliability of the product, including participating in on-call rotations.
• Continuously learn, experiment, and share knowledge with the team.

Required Experience and Skills:

• 5+ years of experience in front-end development.
• Strong expertise in Angular and front-end architecture for large-scale applications.
• Solid understanding of web technologies and browser behavior.
• Experience building scalable, highly responsive, and reliable web apps.
• Passion for UI/UX and attention to detail.
• Ability to thrive in a fast-paced, collaborative environment.
• Excellent communication skills and ability to translate requirements into solutions.
• English level Upper-Intermediate or higher.
• BSc in Computer Science or equivalent practical experience.

Would be a plus:

• Hands-on experience with Angular CLI, testing frameworks (Jasmine, Karma), and Webpack

About Us 🌍
We are a fast-growing iGaming company with over 3 years of success and a team of more than 1,000 passionate professionals. With 8 major projects trusted by thousands of players worldwide, we invite you to join an innovative team that values skill, initiative, and growth!
 

As a Support Manager, you will be the hero for our players, ensuring a smooth, positive, and memorable experience.
 

What You’ll Do 🚀

• Support: Respond promptly to players via live chat.
• Problem Solve: Assist with technical, functional, and financial questions.
• Manage Emotions: Handle challenging situations professionally and turn them into positive experiences.
• Collaborate: Work with other departments to improve processes and products.
• Excel: Achieve personal and team KPIs to deliver top-tier service.
   

What We’re Looking For 🎯

• Experience: Previous support roles (iGaming/betting is a big plus).
• Tech Savvy: Confident PC user with a typing speed of 220+ CPM.
• Equipment: Reliable internet and a PC/Laptop with at least 12 GB of RAM.
• Soft Skills: Stress-resistant, client-focused, and calm under pressure (even with aggressive users).
• Readiness: Willingness to take a typing speed test during the selection process.
   

Schedule & Flexibility 📅

• Rotation: 2/2 shift system: 2 day shifts, 2 days off, 2 night shifts, 2 days off.
• Hours: Day (09:00–21:00) | Night (21:00–09:00) — UTC+2 (Kyiv).
• Onboarding: First month includes flexible training hours to get you up to speed.
   

Benefits & Perks 💎

• Remote Work 🌍: Work from anywhere.
• Growth 💰: Competitive salary + performance-based bonuses.
• Stability 🏖️: Paid vacation and sick leave.
• Well-being 🧠: Access to a corporate psychologist.
• Extras 🎉: Birthday gifts and engaging corporate events.
• Culture 🤝: No micromanagement and a truly supportive team.
   

Career Growth 📈
We don’t just offer a job; we offer a path. We provide clear professional development opportunities and trust your initiative from day one.
 

Ready to level up your career in iGaming? Join us and become part of a team that’s redefining the industry!

Our customer:

Our customer is a technology-driven company developing a high-end Software Defined Radio (SDR) product, already moving from prototyping to commercial production (hundreds of units).

Your tasks:

• Design, develop, and optimize real-time embedded software for a high-performance SDR system
• Implement high-speed data paths inside the SDR and between the SDR and external devices (PC / cloud)
• Develop user-space and kernel-space software on NXP processors
• Work with DPDK-based networking, including UDP/TCP data processing and secure data transmission
• Participate in system-level development involving RF front-end, FPGA (integration level), and processors
• Implement and operate the control plane (internal SDR logic and external communication)
• Ensure real-time performance, low latency, and highly efficient code execution
• Debug complex real-time, multi-component systems (SW + FPGA + RF)
• Implement secure software management flows: secure images, field upgrades, monitoring

Required experience and skills:

• Strong experience in real-time embedded software development
• Hands-on experience with DPDK (mandatory)
• Practical experience with RF systems and digital signal processing in embedded environments
• Solid understanding of networking protocols and data processing (UDP/TCP)
• Experience with NXP processors and user-space / kernel-space development
• Proven ability to write highly efficient, low-latency C/C++ code
• Experience working in systems that include FPGA (FPGA coding not required)
• Strong debugging skills for real-time and complex systems
• Understanding of high-speed data paths and performance optimization
• Good command of English (written and spoken)
• Experience with Python for tooling, scripting, or support tasks

Would be a plus:

• Deep understanding of RF signals and SDR architectures
• Experience with time synchronization technologies (GNSS, IEEE 1588, clock synchronization)
• Background in digital signal processing (DSP) for real-time systems
• Experience with security mechanisms (VPNs, ciphering, secure communication)
• Experience with cloud-connected embedded systems

We’re on the hunt for a full-time Mobile App Digital Marketer, the kind of person who keeps everything running so smoothly that the rest of the team wonders if you have superpowers.

Your day-to-day will include:

• Available in chat from 13:00–22:00 Kyiv time; actual work can be done whenever suits you;

• Digging into research and turning it into clear, structured repots;

• Managing AppStore Ads and AppStore Optimisation 

• Crunching numbers, making sense of analytics & business statistics;

• Helping with HR: finding great people, scheduling interviews, keeping records tidy;

• Using GPT like a boss for almost every task to work smarter, not harder;

• Staying organized when 5 different things need to be done yesterday;

What we’re looking for:

• English: Intermediate;

• You’re an iPhone user in daily life;

• Tech-savvy and quick to learn new tools, apps, and workflows;

• Passion for staying up-to-date with the latest tech news and trends;

• Stress-resistant, able to work quickly without losing accuracy;

• Confident enough to knock on all possible doors to get a task done;

• A hawk’s eye for detail, you catch stuff others miss;

• You actually like organizing things (spreadsheets, docs, tools, bring it on);

• You’re self-motivated and can roll with changing priorities without freaking out;

• If keeping chaos under control sounds like your happy place, we’ll probably get along great.

When you apply, tell us:

1. Your English level
2. The latest time you’re cool with chatting during the required hours
3. The model of iPone you have;
4. What do you usually delegate to AI;
5. Hardest task that you have done and proud of;
6. Hidden somewhere in this post are small mistakes. Spot them and include your answers in the cover letter.

About the Company

We are an outsourcing company developing complex 3D/AR/VR web and mobile solutions for international clients. We work with global brands and startups, creating technologically advanced and unique digital products.

We are looking for a motivated Junior Project Manager whom we are ready to train and grow within the company.

Who This Role Is For
This position is suitable for someone who:

• Has a strong command of English (close to C1 level).
• Wants to build a career in IT project management.
• Is ready to learn quickly and take responsibility.
• Is interested in growing toward client communication and, in the future, sales.

Key Responsibilities

Client Communication Support

• Participate in client meetings.
• Prepare meeting summaries and follow-up messages.
• Conduct online meetings in English.
• Maintain professional written communication in English.

Project Coordination

• Manage tasks in Jira.
• Monitor deadlines and task progress.
• Prepare sprints and maintain backlogs.

Requirements Structuring

• Translate client requests into structured tasks.
• Prepare user stories with acceptance criteria for the team.
• Maintain project documentation.

Internal Process Support

• Participate in daily meetings and sprint reviews.
• Prepare status updates for clients.
• Update project roadmaps.

Mandatory Requirement

• English level C1 or strong B2+ with high spoken fluency.

Nice to Have

• Understanding of Agile/Scrum.
• Technical background or strong interest in technology.
• Experience communicating with international clients.
• Experience working with Jira or similar tools.
• Analytical mindset.

Personal Qualities

• Responsibility.
• Structured thinking.
• Clear communication skills.
• Fast learner.
• Proactive attitude.
• Stress resilience when working with clients.

What We Offer

• Mentorship from experienced Project Managers.
• Work on international projects.
• Clear growth path to Middle PM or transition to Sales / Pre-Sales.
• Flexible remote work format.

Vacancy: Account Manager (AdTech / Mobile Apps)

We are looking for an Account Manager to support existing clients (no cold hunting) at an international AdTech company working with mobile traffic and advertising platforms.

🔹 Responsibilities:

• Manage and grow existing clients (accounting, communication, support).
• Build long-term relationships with partners.
• Participate in industry conferences and events.
• Collaborate with media buying and product teams.
• Work with mobile app advertising platforms (Moloco, Unity, etc.).

🔹 We are looking for someone who has:

• Experience in Account Management / Client Management / Media Buying (former mobile app media buyers are a plus).
• Understanding of AdTech, mobile traffic, and performance marketing.
• English proficiency sufficient for communicating with international partners.
• Strong communication skills, responsibility, and client-oriented approach.
• Willingness to travel for conferences (optional, as needed).

🔹 Conditions:

• Work format: Remote
• Contract type: Service Agreement
• Geography: No restrictions
• Previous companies in resume: No restrictions
• Payment: Preferably in cryptocurrency

💰 Salary & Bonuses:

• Base: $1,000–1,500
• Bonus: % of client spend

We’re looking for an Applied AI Engineer who combines strong ML fundamentals with the discipline of improving production AI systems through metrics, evaluation, and iteration.

This role is hands-on, product-focused, and collaborative with the AI platform lead.

The role in a nutshell

You’ll work on improving production AI systems through evaluation, experimentation, and system design.

A large part of the role involves:

• diagnosing failures in agent workflows
• designing evaluation metrics and KPIs
• improving system prompts and agent behavior
• running structured experiments and measuring impact

You won’t be working in isolation on research projects — you’ll be improving systems that real users depend on.

Rough responsibility breakdown:

• AI evaluation and KPI design — ~30%
• Prompt and agent system design — ~30%
• ML systems (recommendation, optimization, etc.) — ~30%
• Engineering integration — ~10%

What you’ll work on:AI evaluation and system quality

• Design evaluation strategies for LLM and agent workflows
• Create metrics and KPIs for AI system performance
• Build and maintain evaluation datasets
• Debug production AI failures systematically
• Compare system behavior against baselines

This is a core responsibility of the role.

Multi-agent AI systems

• Improve agent orchestration and workflows
• Diagnose failures across agent pipelines
• Refine system prompts and agent interactions
• Improve reliability, latency, and response quality

ML and AI systems

You’ll contribute to areas such as:

• Recommendation systems (ranking and personalization)
• Itinerary optimization and constraint-based planning
• LLM-based reasoning systems
• Optional: computer vision pipelines

Depth in one of these areas is more important than superficial experience in all of them.

Engineering collaboration

We use:

• Golang (primary production language)
• Python when necessary for ML workflows
• Postgres, Redis, and internal services

You don’t need to be a Go expert on day one, but you should be comfortable reading and modifying production code.

Backend engineers handle infrastructure-heavy service development — your focus is AI system behavior and correctness.

What we’re looking forMust-haves

Strong AI/ML fundamentals You understand the theory behind what you build and can choose appropriate methods for a problem.

Examples:

• evaluation metrics (precision/recall/F1/etc.)
• ranking and recommendation concepts
• embeddings and similarity
• experimentation methodology

Not required:

• academic publications
• advanced theoretical math
• large-scale model training experience

Evaluation-driven mindset You:

• think in metrics and baselines
• design experiments instead of guessing
• measure system improvements quantitatively
• debug failures methodically

This is the most important signal for the role.

Experience with LLM systems You’ve worked with:

• prompt design
• agent workflows
• evaluation of LLM outputs
• production LLM integrations

Ability to ship production systems You can:

• turn ideas into working systems
• iterate based on results
• balance exploration with delivery

Programming ability You’re comfortable writing production code in at least one language (Python, Go, or similar) and learning others when needed.

Strong signals (nice to have)

• Experience improving an AI system after deployment
• Recommendation systems or ranking experience
• Optimization or constraint-based systems
• Computer vision experience
• Experience building evaluation frameworks
• Golang experience
• Startup or small-team engineering experience

This role may not be a fit if

• You are looking for a research focused role without production deployment
• You rely heavily on frameworks without understanding fundamentals
• You’re uncomfortable working with partially-defined problems
• You prefer narrow specialization over product ownership