Senior Backend Engineer

6 days ago

Remote Warszawa, Czech Republic Acaisoft Poland Sp. z o.o. Full time

Proven ability to design and build scalable APIs and microservices in production using C# / .NET, backed by 6+ years of experience. Strong SQL / PostgreSQL skills for advanced querying, optimization, aggregation, and processing of large analytical datasets with a focus on performance. Hands-on experience with caching (e.g., Redis), query profiling, building asynchronous data pipelines, optimizing response times, and conducting load testing. Practical experience with CI/CD pipelines and system observability, including logs, metrics, and traces. Solid understanding of access control and security, including RBAC, multi-tenant architecture, and best practices for API security, pagination, and aggregation patterns in analytical systems. Nice to have: Full-stack capability with React/TypeScript; familiarity with AMCharts or equivalent charting libraries. Experience with analytics/BI backends, KPI semantics, and time-series/trend computation. Knowledge of distributed systems patterns (message queues, background jobs, schedulers). Familiarity with Snowflake, data warehouse patterns, and tools such as DBT or MetricFlow. Hi there If you’re looking for a high-impact position in an ambitious software house, we’ve got a match for you We’re looking for a Backend Engineer to join our team and help shape the Reports & Visualization Platform for our U.S. client. The project centers on building a custom dashboard solution that empowers users with intuitive filtering, personalized saved views, and advanced visualization features. You’ll be developing the backend services and APIs that make these experiences possible - transforming dashboards from static reports into dynamic, indispensable tools for daily decision-making. You will work in Polish working hours (CEST).  ,[Design and develop backend services and APIs to support advanced filtering, saved views, and KPI/dashboard visualization features., Model and query large KPI datasets efficiently, ensuring high performance, correct aggregation, grouping, and time-based calculations., Build and maintain secure, multi-tenant APIs with RBAC, versioning, idempotency, and robust validation., Optimize system performance and reliability through caching, async pipelines, query tuning, load management, and monitoring., Collaborate with front-end and design teams to define API contracts, DTOs, and ensure smooth integration with React/visualization components., Develop and maintain automated tests and documentation, including unit, integration, contract tests, runbooks, and ADRs.] Requirements: C#, .NET, SQL, PostgreSQL, Redis, Data pipelines, CI/CD Pipelines, RBAC, Multi-Tenant Architecture, Best practices for API security, Testing, React, TypeScript, BI, Message queue, Snowflake, dbt Tools: . Additionally: Sport subscription, Private healthcare, Flat structure, Small teams, International projects, Free coffee, Bike parking, Playroom, Free snacks, Free beverages, Free parking, Modern office, Startup atmosphere.

  • Senior Backend Developer

    2 weeks ago

    Warszawa, Czech Republic Link Group Full time

    6+ years of experience in backend software development. Strong expertise in Java and Scala. Proven track record in designing and building systems with large data volumes and high scalability. Solid skills in SQL development and debugging relational databases. Hands-on experience with cloud platforms (preferably AWS) and containerized microservice...

  • Senior Software Engineer Kotlin @ Antal

    2 weeks ago

    Remote, Warszawa, Czech Republic Antal Full time

    At least a decade of professional experience in back-end development including 3+ years with Kotlin and in a technical leadership role as well Strong proficiency in Kotlin and solid understanding of modern backend architecture (e.g., microservices, REST, event-driven design) Experience with Spring framework (with Kotlin) Deep knowledge of modern...

  • Backend Engineer @ Fresha

    1 week ago

    Warszawa, Czech Republic Fresha Full time

    Experience building and maintaining globally distributed systems. Knowledge of event-driven architectures (Kafka). ~2+ years of experience in product engineering, developer tools, or infrastructure at scale. A pragmatic generalist who thrives on learning new frameworks and tackling complex challenges. Familiarity with languages such as Elixir, Ruby, or...

  • Senior Backend Engineer

    6 days ago

    Warszawa, Czech Republic Link Group Full time

    7+ years of experience in backend development. Strong skills in C#/.NET Core, SQL Server, MongoDB. Knowledge of Redis, Kafka, CI/CD tools, observability platforms (e.g., Datadog). Experience with AWS or another cloud platform. Good communication skills and ability to work in dynamic teams. Bonus: basic knowledge of Angular or React. We are looking for a...

  • 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 Fullstack Engineer @ Sunscrapers

    1 week ago

    Remote, Czech Republic Sunscrapers Full time

    What’s important for us? Expertise in TypeScript Proficiency in React its latest ecosystem, like hooks, react-query etc Proficiency in CSS and related tooling (Sass or Less) Experience with designing and consuming REST APIs Excellent command in spoken and written English, at least C1 Attention to detail and sense of aesthetics, from clean code to beautiful...

  • 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

    2 weeks ago

    Remote, Czech Republic HomeBuddy Full time

    You’re going to need this to be successful in this role 5+ years of professional development experience, with experience in PHP/Laravel. Experience in at least one other modern language or framework - ideally .NET Core, Go, Kotlin/Native/Multiplatform. Alternatively, experience in Node.js or Python. Solid understanding of OOP, SOLID principles, and design...

  • Senior AWS Python Backend Engineer @ Holisticon Connect

    1 week ago

    Remote, Wrocław, Czech Republic Holisticon Connect Full time

    ✅  You might be the perfect match if you are/have: 4+ years of professional backend software development in Python; Good understanding of event-driven development; In-depth knowledge of a variety of AWS cloud services and solutions; Hands-on solid knowledge of containerisation technologies such as Docker; Ability to work with Unix and Bash shell...

  • Senior Backend Engineer

    1 week ago

    Remote, Wrocław, Kraków, Białystok, Łódź, Warszawa, Gdynia, Czech Republic Spyrosoft Full time

    Strong professional experience with Kotlin and Java Expertise with Spring Boot framework Solid understanding of microservices architectures Hands-on experience with Kubernetes and containerization technologies Proficiency in Git, CI/CD, and modern DevOps practices Familiarity with database design and management Passion for renewable energy and...