Jobs

• Programming Languages: Kotlin, Java, JavaScript
• Frameworks & Libraries: Spring Boot
• Android Development: Jetpack Compose, Retrofit, Room, Android Architecture Components, MVVM, Clean Architecture
• Databases: MySQL, PostgreSQL, MongoDB, Firebase, Redis
• Cloud & DevOps: AWS, Docker, Kubernetes, Jenkins, CI/CD, Git
• Testing: JUnit, Mockito, Espresso, TestNG, Cucumber
• Other Tools: Gradle, Maven, Git, JIRA, Confluence
• Agile Methodologies: Scrum, Kanban

We are looking for a skilled Backend Developer with expertise in both mobile/client application development using Flutter/Dart and backend development in Kotlin. The ideal candidate will be responsible for designing robust APIs and ensuring our applications' security, optimization, and scalability. You will collaborate closely with analysts, QAs, and DevOps teams to deliver high-quality software solutions. 

Responsibilities: 

• Build and maintain backend services using Kotlin.
• Develop mobile and client applications using Flutter/Dart.
• Design, implement, and document efficient and secure APIs. 
• Ensure application security, performance optimization, and scalability. 
• Collaborate with cross-functional teams, including analysts, QA testers, and DevOps. 
• Participate in code reviews and contribute to improving development processes and standards. 

Qualifications: 

• 3+ years of experience with any JVM language (Kotlin, Java, Scala, or Clojure). 
• Nice to have some experience with Flutter/Dart, or a strong willingness to learn. 
• Experience with React or Angular, Vue.js will be a plus
• Proven experience working with relational databases. 
• Demonstrated experience in creating REST APIs. 
• Solid understanding of design patterns and microservices architecture. 
• Excellent communication and teamwork skills. 

Nice to Have: 

• Familiarity with continuous integration and continuous deployment (CI/CD) processes. 
• Experience with performance tuning and application scalability strategies. 
• Proactive problem-solving skills and a keen attention to detail. 

What you will do

• Maintain and extend the Kotlin backend services that support our mobile applications;
• Collaborate with mobile and product teams to design and implement robust APIs;
• Identify performance bottlenecks and optimize backend processes;
• Participate in architectural discussions and help guide system evolution;
• Write clean, scalable, and well-documented code;
• Contribute to code reviews, tech planning, and continuous improvement;

• Provide support for production systems and assist in incident resolution.

   

Must haves

• 4+ years of experience in backend development;
• Strong proficiency in Kotlin for backend services;
• Experience with designing and integrating RESTful APIs;
• Familiarity with microservices architecture;
• Hands-on experience with databases (SQL and/or NoSQL);
• Solid understanding of asynchronous programming, multithreading, and performance optimization;
• Experience with cloud services (e.g., AWS, GCP, or Azure);
• Familiarity with CI/CD practices and tools (Git, Docker, etc.);

• Upper-Intermediate English level.

   

Nice to haves

• Working knowledge of PHP (for legacy support or integration);
• Experience with Ktor or Spring Boot for Kotlin;
• Background in supporting mobile-first products;
• Experience with monitoring/logging tools (e.g., Prometheus, ELK, Grafana);
• Exposure to Agile development practices.

The benefits of joining us

• Professional growth: Accelerate your professional journey with mentorship, TechTalks, and personalized growth roadmaps.
• Competitive compensation: We match your ever-growing skills, talent, and contributions with competitive USD-based compensation and budgets for education, fitness, and team activities.
• A selection of exciting projects: Join projects with modern solutions development and top-tier clients that include Fortune 500 enterprises and leading product brands.

• Flextime: Tailor your schedule for an optimal work-life balance, by having the options of working from home and going to the office, whatever makes you the happiest and most productive.

   

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Our Customer:

Our client is an all-in-1 learning platform that integrates fully and easily with the school’s LMS. It replaces paper materials and consolidates learning resources in one device.
 

Required experience and skills:

• 4+ years of experience in mobile development native Android;
• Solid experience with Kotlin and strong understanding of KMP architecture and tooling;
• Excellent problem-solving skills and ability to work independently on complex tasks;
• English – Upper-Intermediate.
   

Working conditions

5-day working week, 8-hour working day, flexible schedule;

All UA public holidays are days off;

Vacation and sick leave are covered by the company;

Remote work.

We are looking for a Senior Kotlin Backend Developer to join our team for a long-term project. 

Our client is an Australian software development company working on its betting platform. 

Project: Esports, sports, and racing betting platform and media brand. Australia and the international market: 

- We are looking for a senior back-end developer to work on our live, multi-platform, multi-user entertainment platform 

- The primary focus of this role is developing the HTTP APIs and business logic to power the betting platform 

- Working in the gambling industry 

Qualifications Required 

- 7+ years of overall experience as a Java Developer 

- API Development Experience. Proficient in Kotlin. Kotlin will be the language you use day to day

- Experience and interest in solving scalable and performance issues 

- PostgreSQL. Strong SQL, database design, and RDBMS knowledge is a must

- Cloud experience 

- Front End Web Development experience is a bonus
- Self-managed person 

- Upper Intermediate English 

Full-time remote job

Hello everyone! 👋🏻

Our company is looking for people who are passionate about their work and are always ready for new challenges. If you are looking for a company where you can realize your potential, then CodeLions is the place for you!

Join our team as a Kotlin Developer and become part of a successful company! 💙

Qualifications:

• Proven experience as a Kotlin Developer
• 5+ years of experience in Kotlin and web development.
• Strong knowledge of Kotlin and Java web development.
• Experience with third-party libraries and APIs.
• Solid understanding of the full web development life cycle.
• Excellent problem-solving skills and attention to detail.
• Strong leadership skills and experience in managing a development team.

• English: B2 or higher

   

  Tech stack: Java / Kotlin, PostgreSQL, RabbitMQ, Directus/OpenApi, GitLab Youtrack

   

  Interview stages:

• HR interview (20 minutes)
• Tech interview (1 hour)

• Client interview 

  
  We offer:

• full-time job (flexible working hours), remotely or in the office;
• regular salary review based on work performance;
• mentorship program;
• working in a competitive, but supportive team, introductory and current training, team building activities;
• 15 sick leaves (5 - 100%, 10 - 50%) and 18 paid vacation business days per year;
• health benefits (gym, spa, pool);
• free parking place.
• PE Accountant Support
• IT Cluster Membership
   

Description
We’re a supportive, inclusive group that values collaboration and fosters a strong sense of belonging. Our team operates with transparency and alignment, guided by scaled agile practices that promote continuous improvement.

We’re driven by values that shape how we work together every day:
Teamwork, ownership, accountability, proactivity, transparency, empathy, inclusivity, and a commitment to continuous learning and growth.

Requirements
Proven experience developing and deploying Android applications and a strong understanding of the Android ecosystem.
Proficiency in Java and Kotlin languages, and a deep understanding of Android UI design principles (Jetpack Compose) and patterns (Jetpack Compose Navigation).
In-depth knowledge of Android SDK, Android Studio, and Git.
Experience with Android libraries (Camera APIs) and frameworks.
Deep knowledge of mobile app architecture and design patterns (e.g., MVC, MVP, MVVM), reactive programming, and coordinator patterns.
Deep knowledge of native platform APIs, frameworks, and lifecycle management.
Solid grasp of RESTful APIs, GraphQL, and real-time communication.
Experience with Android mobile performance optimization and memory management.
Familiarity with Android mobile security best practices.
Strong background in automated testing in Android, including unit, UI, and integration testing.
Familiarity with version control systems (e.g., Git) and agile development methodologies.
Experience with testing frameworks (Compose UI Testing, JUnit).
Excellent problem-solving skills with a keen attention to detail.
Excellent communication skills and a collaborative mindset.
Ability to work asynchronously in a distributed team.

Job responsibilities
Design and create scalable, performant, and maintainable native mobile applications for Android.
Work closely with product managers, designers, and engineers to translate business requirements into technical solutions.
Write clean, testable, well-documented code, ensuring optimal performance and maintainability.
Guide and mentor Android mobile engineers
Identify, analyze, and resolve complex technical challenges
Evaluate and integrate modern technologies, SDKs, and frameworks to enhance product capabilities.
Make decisions and develop around mobile CI/CD, testing strategies, dependency management, and release pipelines.
Ensure seamless and secure integration with backend APIs and services.
Maintain a deep understanding of Google’s platform guidelines, tools, and roadmaps.
Stay updated on the latest Android SDK, libraries, and development tools to enhance our product offerings continuously.

У компанії UpUp ми шукаємо досвідченого Back-end розробника (Spring Boot + Kotlin).
Ця роль підходить технічному фахівцю, який вміє самостійно вести проєкти та ефективно взаємодіяти з front-end командою.
 

Основні обов'язки:

• Розробка проєктів: трансформація бізнес-вимог у надійні технічні рішення.
• Робота з базами даних: створення, оптимізація та підтримка реляційних баз даних (PostgreSQL).
• Розгортання проєктів: налаштування та автоматизація процесів CI/CD, підготовка середовищ, використання хмарних сервісів (AWS).
• Створення REST API: розробка та підтримка бекенд-логіки з урахуванням вимог безпеки та масштабованості.
• Співпраця з front-end командою: участь в інтеграції, технічних обговореннях і вирішенні спільних задач.
• Документування рішень: ведення технічної документації для підтримки та розвитку проєктів.
• Участь у плануванні: технічна оцінка завдань, визначення пріоритетів і термінів реалізації.
   

Основні вимоги:

• Досвід роботи від 2 років на позиції Back-end розробника або Software Engineer.
• Впевнене володіння Kotlin та Spring Boot.
• Практичний досвід з реляційними базами даних (PostgreSQL): проєктування, оптимізація запитів, створення схем.
• Знання інструментів Gradle та Git.
• Розуміння принципів REST API, безпеки та масштабованості.
• Досвід роботи з AWS (EC2, RDS тощо) — буде перевагою.
• Базові знання front-end технологій (Angular, React, Android) — додатковий плюс.
• Розвинене аналітичне мислення, здатність ефективно вирішувати складні технічні задачі.
• Високий рівень відповідальності та самостійності; ініціативність у прийнятті технічних рішень.
• Добрі комунікативні навички та здатність працювати в кросфункціональній команді.

У UpUp ми підтримуємо культуру відкритого діалогу, де ідеї та пропозиції обговорюються конструктивно. Ми цінуємо ініціативу, відповідальність і прагнення до зростання. Наша команда орієнтована на довгострокову співпрацю та взаємну підтримку.
Якщо вам близькі такі принципи — будемо раді поспілкуватися.