• Desarrollo y mantenimiento de aplicaciones web escalables del lado del front-end y back-end utilizando tecnologías basadas en Java • Diseño e implementación de interacciones de usuario e interfaces web responsivas • Desarrollo de aplicaciones y servicios de back-end a nivel empresarial • Implementación de lógica de negocio central y flujos de trabajo empresariales complejos • Diseño, desarrollo y mantenimiento de arquitecturas de API y microservicios • Garantizar la seguridad de las aplicaciones, protección de datos y cumplimiento de estándares de seguridad • Participar en la planificación y implementación de soluciones de software escalables y de alto rendimiento • Participar en ceremonias Ágiles, incluyendo planificación de sprint, reuniones diarias, revisiones y retrospectivas

Role Description Adree is seeking a .NET Backend Developer to design, develop, and maintain backend services and APIs. The role involves building scalable systems, improving performance, and collaborating with frontend, QA, and other engineering teams. - Develop and maintain backend services using .NET / C#. - Build REST APIs and backend endpoints following best practices. - Design and implement database solutions using SQL Server / PostgreSQL / MySQL. - Write efficient queries, optimize performance, and ensure data integrity. - Integrate backend services with external systems using APIs and webhooks. - Implement authentication/authorization (e.g., JWT, OAuth2) and security best practices. - Create and maintain background jobs/queues using technologies like Hangfire / Quartz / Azure Functions / Service Bus (as applicable). - Build and maintain microservices or modular monolith architecture (as per project needs). - Work with caching mechanisms (e.g., Redis) if required. - Perform code reviews, debugging, and ensure high-quality code and documentation. - Use Git workflows and follow agile/Scrum practices. - Support production deployments and resolve issues in a timely manner. Qualifications - 3–6 years of professional experience in .NET backend development. - Strong experience in C#, ASP.NET Core, Web APIs. - Good understanding of OOP, design patterns, and clean code. - Strong database knowledge and ability to write optimized SQL queries. - Experience with authentication/authorization concepts (JWT/OAuth2). - Strong understanding of asynchronous programming and performance considerations. - Hands-on experience with at least one of the following: Entity Framework / Dapper. - Web API / RESTful services. - Basic understanding of system design and scalability concepts. - Good communication and teamwork skills. Job Location HQ

Role Description Fit4Me is looking for a Middle Back-End Developer who will help build and scale the backend of our Health & Fitness product, creating server-side solutions that directly impact user personalization, product stability, and the speed of delivering new features. - Develop backend services, the admin panel, and internal tools for content management and personalized workout programs. - Work on functionality that allows users to personalize their workout experience. - Contribute to the evolution of our backend architecture and integrate new services. - Continuously improve our technical platform as the product grows. This role is a great fit if you: - Want to build functionality that directly impacts the experience of thousands of users. - Enjoy working with business logic, APIs, and backend architecture. - Thrive in a product team where ownership, autonomy, and responsibility are valued. - Like designing clean, maintainable, and scalable backend solutions. - Want to see how your technical decisions contribute to product growth. Qualifications - 3+ years of commercial experience as a Back-End Developer. - Strong hands-on experience with Node.js and TypeScript. - Practical experience working with MongoDB and Mongoose. - Experience with PostgreSQL or other relational databases. - Experience working with Redis. - Hands-on experience building and maintaining REST APIs. - Understanding of scalable backend architecture principles. - Experience integrating external services and working with webhooks. - Solid understanding of authentication and authorization mechanisms (JWT, OAuth). - Experience working with AWS (experience with AWS S3 is a strong plus). - Experience using Git in a collaborative development environment. - Understanding of clean architecture principles, REST, and SOLID. - Ownership mindset, analytical thinking, and the ability to work independently. Requirements - Experience working with RabbitMQ or other messaging/queue systems (nice to have). - Experience using Docker (nice to have). - Hands-on experience with Swagger / OpenAPI (nice to have). - Understanding of ACID principles and database transactions (nice to have). - Experience working with ORM frameworks such as TypeORM, Sequelize, or similar (nice to have). - Experience participating in database migration projects between MongoDB and SQL (nice to have). - Experience working with payment systems, subscriptions, billing, or financial integrations (nice to have). - Experience building backend systems for mobile products (nice to have). - Understanding of logging, monitoring, and basic observability practices (nice to have). Benefits - Fully remote work with a flexible schedule and dedicated business hours for collaboration. - A high level of autonomy, trust, and ownership over your work. - The opportunity to contribute to a Ukrainian Health & Fitness product that helps people build healthier lifestyles. - A collaborative team that values open communication, fast decision-making, and initiative. - Opportunities for professional growth while working alongside an experienced product and engineering team. Hiring process - Interview with Recruiter - Technical Interview - Final Interview with HRD - Job Offer 🚀

• Design, build, and evolve backend services in Go for the Data Insights Platform and Siphon, with a focus on scalable ingestion, transport, replication, storage, querying, and deployment paths. • Own significant parts of the backend architecture for Data Insights Platform, Siphon, and the Query API, including the gRPC integration between the Query API and the GitLab Rails application, and shape technical direction for system boundaries, reliability, throughput, operability, and maintainability. • Contribute to systems built around replication, buffering, query-serving, and query-oriented storage patterns, including Siphon, NATS or similar messaging layers, ClickHouse-backed storage, and APIs consumed by GitLab product surfaces. • Drive production readiness and deployment of Data Insights Platform and Siphon across GitLab environments, with attention to rollout safety, environment-specific constraints, and long-term operational readiness. • Debug and improve complex distributed systems in production, including performance bottlenecks, scaling limits, failure recovery paths, and observability gaps. • Work closely with Infrastructure, Data, and peer Engineering teams on technical design, iteration planning, code review, and delivery to keep the platform reliable, secure, and usable by downstream consumers. • Work asynchronously with other team members in GitLab's all-remote environment and contribute to a culture of clear written communication, iteration, and ownership. • Use AI effectively in your daily workflow as a productivity multiplier for implementation, debugging, investigation, and documentation work.