Senior Backend SDE

7 days ago

Remote, Czech Republic Xenoss Full time

Required skills: Professional Java experience 5+ years OOP/design patterns proficiency Experience building complex systems SQL/NoSQL database experience Familiar with AWS or GCP Experience in the AdTech domain. Nice to have: Experience with big data  Experience with OLAP DB (Cassandra, Clickhouse)  Experience with Neo4J  English: B1 Who we are Xenoss is a leading MarTech/AdTech software development house, recognized among the top software companies. We build complex AI-driven ad-tech solutions for technology vendors, media and gaming companies, agencies, brands, and publishers, including Activision Blizzard, Toshiba, Smartly, Voodoo, and others. The data platform is a central element of our solutions. Our data team works on challenging projects that involve near-real-time processing of petabytes of high-intensity streaming data. We build scalable and efficient data pipelines using cutting-edge technologies and proprietary solutions. What you will get  Teams of people who love programming  Complex technical challenges with big data/high-load  Freedom to make your own engineering decisions and broad space for creativity  Modern technology stack to work with  Work remotely on a flexible schedule  Long-lasting projects  Financial compensation for professional events and education  Opportunity to choose the equipment you like ,[Design and implement backend systems: You’ll dive deep into the server-side, architecting and building the core logic that powers our applications. This includes designing databases, developing APIs, and ensuring scalability to handle high traffic volumes., Code quality: Clean, maintainable, and secure code is paramount. You’ll write well-documented, reusable code that adheres to best practices. Your expertise will ensure the long-term health and stability of our backend systems., Collaborate across team: You’ll work closely with front-end developers to seamlessly integrate backend functionalities with the user interface. Effective communication and collaboration are key to creating a cohesive user experience., Optimize performance and security: You’ll be responsible for ensuring our applications run smoothly and efficiently. This involves performance tuning, troubleshooting, and implementing robust security measures to safeguard sensitive data., Embrace innovation and stay ahead of the curve: The tech landscape is constantly evolving. You’ll have the opportunity to explore and implement emerging technologies to keep our backend infrastructure at the forefront.] Requirements: Java, OOP, Design Patterns, SQL, NoSQL, AWS, GCP, Big data, Cassandra, Neo4j

  • Senior Java Backend Developer @ Upvanta

    2 weeks ago

    Remote, Czech Republic Upvanta Full time

    Skills and attributes for success Excellent knowledge of Java supported by 8+ years of professional experience Many years of experience in commercial projects in development and maintain scalable backend services using Java, Spring, Spring Boot, and microservices architecture Experience in design and implementation secure RESTful APIs, Practical experience...

  • Senior Backend Engineer

    5 days ago

    Remote, Wrocław, Czech Republic Cense AG Full time

    What You Bring A mid/senior-level experience with demonstrated expertise in backend engineering Solid knowledge and experience working with REST APIs Writing well-organized, efficient, and easily testable code Proficiency in NodeJS and Javascript/Typescript development. Good understanding of SQL and NoSQL databases. Capable of leading initiatives and...

  • Senior Backend Developer @ Devire

    2 weeks ago

    Remote, Czech Republic Devire Full time

    Minimum 3 lata komercyjnego doświadczenia w tworzeniu backendu z wykorzystaniem Node.js, w szczególności z użyciem TypeScript i relacyjnych baz danych (SQL). Dobra znajomość jednego z frameworków backendowych, takich jak Nest.js, Spring Boot lub ASP.NET Core. Umiejętność projektowania skalowalnych, wydajnych i bezpiecznych systemów (system...

  • Senior Backend Engineer

    2 weeks ago

    Remote, Wrocław, Kraków, Łódź, Czech Republic Unravel Full time

    5+ years of experience in backend development, preferably in a microservices architecture. Strong expertise in Node.js and Golang; proficiency in Python is a plus. Experience with PostgreSQL and database design and Key-Value-Stores like redis for high-availability systems. Solid knowledge of containerization (Docker) and orchestration with Kubernetes....

  • Senior Backend Developer eCommerce @ Makeitright Sp. z o.o.

    1 day ago

    Remote, Warszawa, Czech Republic Makeitright Sp. z o.o. Full time

    Wymagania – must have: Minimum 3–5 lat doświadczenia jako Backend Developer (preferowane środowisko eCommerce).  Doświadczenie w pracy z Docker i Kubernetes.  Znajomość zagadnień wydajnościowych, bezpieczeństwa i skalowalności systemów.  Praktyczna wiedza z zakresu integracji systemów (REST API, SOAP, itp.).  Dobra znajomość języków...

  • Senior Backend Developer

    2 weeks ago

    Remote, Gdańsk, Wrocław, Warsaw, Kraków, Poznań, Czech Republic RemoDevs Full time

    5+ years as a professional developer, with strong experience in Backend Development in a SaaS environment. Expert in Python 3.10+ and Django 4.x (REST APIs, ORM, async tasks). Skilled in system design and building distributed systems on AWS. Deep knowledge of PostgreSQL, Redis, and Elasticsearch/OpenSearch. Hands-on AWS experience (ECS, Lambda,...

  • Backend developer

    1 week ago

    Remote, Warszawa, Czech Republic TIME4IT Full time

    Kogo szukamy? Bardzo dobrej znajomości JavaScript / TypeScript Doświadczenia w NestJS Umiejętności tworzenia i dokumentowania REST API Znajomości MongoDB i baz NoSQL Umiejętności pisania testów jednostkowych (Jest) Znajomości podstaw CI/CD (GitHub Actions) Zrozumienia architektur: CQRS (Command Query Responsibility Segregation), Event-Driven...

  • Sr./Staff Backend Engineer

    1 day ago

    Remote, Palo Alto, Czech Republic Oscilar Full time

    Requirements Backend Development: 8+ years of experience with Java in large-scale, distributed environments. Kafka Mastery: Extensive experience with Apache Kafka, including Kafka Streams, Kafka Connect, partitioning, replication, and consumer group management. Cloud Infrastructure: Strong experience with AWS services (e.g., MSK, EC2, RDS, DynamoDB, S3,...

  • Backend Software Engineer @ Papaya Global

    7 days ago

    Remote, Kraków, Czech Republic Papaya Global Full time

    5+ years of experience in server-side development (we use Java 21+) Strong expertise in the field of microservices (Kubernetes) Experience with web service frameworks (Spring) Experience with cloud infrastructure (S3, SQS, SES) Previous experience with hexagonal architecture, event driven architecture, 12 factor application principles Hands-on experience...

  • Remote Senior Python Developer

    3 days ago

    Remote, Czech Republic Netguru Full time

    Requirements Strong hands-on experience in Python, ideally in backend or data-focused development. Basic to intermediate understanding of LLM frameworks (LangChain, LangGraph) or a strong motivation to learn them. Familiarity with RAG, ReAct, or multi-agent architectures is a plus. Experience with SQL and structured data formats (CSV, Parquet)....