Senior Backend Engineer

🏢 Summary: Senior engineer role focused on designing and implementing backend services and APIs for new payment models and authorization systems in a high-availability, high-security environment. The position involves architectural design, technology selection, building production-grade solutions and proof-of-concepts, and creating scalable, secure integrations. The role also supports testing and deployment processes while contributing to mission-critical payment infrastructure. 🗂️ Requirements: Minimum 10 years experience as backend/full-stack/system engineer, Proficiency in at least two programming languages, Strong knowledge of API design, Experience with microservices architecture, Experience with messaging queues and event-driven systems, Experience with SQL and NoSQL databases, Experience building complex system integrations, Experience in high-availability environments, Experience in high-security environments, Experience with Open Source technologies, Ability to design secure and scalable services 📃 Skills: API, Microservices, SQL, NoSQL, Queues, Event-driven, Blockchain, Ethereum, Hyperledger, Cosmos, Substrate, ITIL, RAG, AI, Low-latency, Real-time, Tokenization 🏢 Description: Twój zakres obowiązków Projektowanie oraz implementacja usług backendowych i API dla nowych modeli płatności oraz systemów autoryzacyjnych. Tworzenie prototypów i usług integracyjnych działających w środowisku o wysokiej dostępności. Współpraca z liderem technicznym przy projektowaniu architektury nowych rozwiązań. Uczestnictwo w procesie analizy technologicznej i wyborze narzędzi. Tworzenie kodu produkcyjnego oraz proof-of-concepts dla nowych funkcjonalności. Dbanie o bezpieczeństwo, skalowalność i jakość implementowanych usług. Współpraca z osobą odpowiedzialną za warstwę biznesowo-regulacyjną oraz z pozostałymi członkami zespołu technicznego. Wspieranie procesów testowych i wdrożeniowych Nasze wymagania Minimum 10 lat doświadczenia w roli backend software engineer / full-stack engineer / system engineer. Bardzo dobra znajomość przynajmniej dwóch języków programowania. Zdrowe fundamenty architektoniczne: API design, mikroserwisy, kolejki, zdarzenia, bezpieczeństwo usług. Umiejętność pracy z bazami danych (SQL/NoSQL) oraz tworzenia złożonych integracji. Samodzielność w prowadzeniu prac projektowych oraz zdolność do działania w obszarach bez gotowych rozwiązań. Doświadczenie w pracy w środowiskach o podwyższonym rygorze bezpieczeństwa lub wysokiej dostępności usług. Doświadczenie w pracy z technologiami Open Source. Umiejętność czytania i rozumienia dokumentacji technicznej oraz proponowania rozwiązań. Mile widziane Znajomość wyzwań związanych z low-latency, event-driven architecture, real-time processing. Znajomość technologii blockchain (Ethereum, Hyperledger, Cosmos, Substrate itp.). Znajomość zagadnień ITIL lub posiadanie podstawowych certyfikatów. Rozumienie tokenizacji aktywów, modeli emisji, systemów rejestrów. Praca z agentami AI, orchestratorami, RAG, systemami wektorowymi. Tworzenie botów lub API do automatycznych agentów wykonujących procesy decyzyjne. To oferujemy Pracę przy jednym z najważniejszych systemów płatniczych w Polsce, który codziennie obsługują miliony użytkowników. Realny wpływ na bezpieczeństwo i dostępność usług płatniczych. Możliwość rozwoju kompetencji technicznych i operacyjnych. Przyjazne środowisko, nastawione na współpracę i ciągłe doskonalenie. Elastyczne godziny pracy oraz model hybrydowy. Pakiet benefitów (opieka medyczna, ubezpieczenie, język angielski, platforma e-learningowa, MyBenefit, MultiSport). Budżet rozwojowy i dostęp do szkoleń branżowych.

🏢 Summary: Rola senior backend/full‑stack engineera odpowiedzialnego za projektowanie i implementację usług backendowych oraz API dla nowych modeli płatności i systemów autoryzacyjnych w środowisku o wysokiej dostępności i podwyższonym rygorze bezpieczeństwa. Obejmuje współtworzenie architektury, budowę integracji, proof‑of‑conceptów oraz dbanie o skalowalność, bezpieczeństwo i jakość rozwiązań. Praca przy kluczowym systemie płatniczym z realnym wpływem na jego rozwój i niezawodność. 🗂️ Requirements: Minimum 10 lat doświadczenia jako backend / full-stack / system engineer, Bardzo dobra znajomość co najmniej dwóch języków programowania, Doświadczenie w projektowaniu API i architekturze mikroserwisowej, Znajomość kolejek, architektury zdarzeniowej i bezpieczeństwa usług, Doświadczenie w pracy z bazami danych SQL i NoSQL, Umiejętność tworzenia złożonych integracji systemowych, Doświadczenie w środowiskach o wysokiej dostępności lub podwyższonym rygorze bezpieczeństwa, Doświadczenie z technologiami Open Source, Samodzielność w prowadzeniu prac projektowych, Umiejętność analizy dokumentacji technicznej i proponowania rozwiązań 📃 Skills: API, Microservices, SQL, NoSQL, OpenSource, Queues, EventDriven, Security, Blockchain, Ethereum, Hyperledger, Cosmos, Substrate, ITIL, AI, RAG, VectorDB 🏢 Description: Twój zakres obowiązków Projektowanie oraz implementacja usług backendowych i API dla nowych modeli płatności oraz systemów autoryzacyjnych Tworzenie prototypów i usług integracyjnych działających w środowisku o wysokiej dostępności Współpraca z liderem technicznym przy projektowaniu architektury nowych rozwiązań Uczestnictwo w procesie analizy technologicznej i wyborze narzędzi Tworzenie kodu produkcyjnego oraz proof-of-concepts dla nowych funkcjonalności Dbanie o bezpieczeństwo, skalowalność i jakość implementowanych usług Współpraca z osobą odpowiedzialną za warstwę biznesowo-regulacyjną oraz z pozostałymi członkami zespołu technicznego Wspieranie procesów testowych i wdrożeniowych Nasze wymagania Minimum 10 lat doświadczenia w roli backend software engineer / full-stack engineer / system engineer. Bardzo dobra znajomość przynajmniej dwóch języków programowania Zdrowe fundamenty architektoniczne: API design, mikroserwisy, kolejki, zdarzenia, bezpieczeństwo usług Umiejętność pracy z bazami danych (SQL/NoSQL) oraz tworzenia złożonych integracji Samodzielność w prowadzeniu prac projektowych oraz zdolność do działania w obszarach bez gotowych rozwiązań Doświadczenie w pracy w środowiskach o podwyższonym rygorze bezpieczeństwa lub wysokiej dostępności usług Doświadczenie w pracy z technologiami Open Source Umiejętność czytania i rozumienia dokumentacji technicznej oraz proponowania rozwiązań Mile widziane Znajomość wyzwań związanych z low-latency, event-driven architecture, real-time processing. Znajomość technologii blockchain (Ethereum, Hyperledger, Cosmos, Substrate itp.). Znajomość zagadnień ITIL lub posiadanie podstawowych certyfikatów. Rozumienie tokenizacji aktywów, modeli emisji, systemów rejestrów. Praca z agentami AI, orchestratorami, RAG, systemami wektorowymi. Tworzenie botów lub API do automatycznych agentów wykonujących procesy decyzyjne. To oferujemy Pracę przy jednym z najważniejszych systemów płatniczych w Polsce, który codziennie obsługują miliony użytkowników. Realny wpływ na bezpieczeństwo i dostępność usług płatniczych. Możliwość rozwoju kompetencji technicznych i operacyjnych. Przyjazne środowisko, nastawione na współpracę i ciągłe doskonalenie. Elastyczne godziny pracy oraz model hybrydowy. Pakiet benefitów (opieka medyczna, ubezpieczenie, język angielski, platforma e-learningowa, MyBenefit, MultiSport). Budżet rozwojowy i dostęp do szkoleń branżowych.

🏢 Summary: Senior backend/full-stack engineer role focused on designing and implementing backend services and APIs for payment models and authorization systems in a high-availability environment. The position involves architectural design, technology selection, building production-grade services and proofs-of-concept, and ensuring security and scalability. You will work on critical payment infrastructure used by millions of users. 🗂️ Requirements: Minimum 10 years of experience as backend, full-stack, or system engineer, Proficiency in at least two programming languages, Strong knowledge of API design, Experience with microservices architecture, Experience with queues and event-driven systems, Experience with service security, Experience with SQL and NoSQL databases, Experience building complex system integrations, Ability to work independently on architectural tasks, Experience in high-security or high-availability environments, Experience with OpenSource technologies, Ability to read and understand technical documentation 📃 Skills: API, Microservices, Queues, Events, SQL, NoSQL, Security, OpenSource, Architecture, Integration 🏢 Description: Twój zakres obowiązków Projektowanie oraz implementacja usług backendowych i API dla nowych modeli płatności oraz systemów autoryzacyjnych Tworzenie prototypów i usług integracyjnych działających w środowisku o wysokiej dostępności Współpraca z liderem technicznym przy projektowaniu architektury nowych rozwiązań Uczestnictwo w procesie analizy technologicznej i wyborze narzędzi Tworzenie kodu produkcyjnego oraz proof-of-concepts dla nowych funkcjonalności Dbanie o bezpieczeństwo, skalowalność i jakość implementowanych usług Współpraca z osobą odpowiedzialną za warstwę biznesowo-regulacyjną oraz z pozostałymi członkami zespołu technicznego Wspieranie procesów testowych i wdrożeniowych Nasze wymagania Minimum 10 lat doświadczenia w roli backend software engineer / full-stack engineer / system engineer. Bardzo dobra znajomość przynajmniej dwóch języków programowania Zdrowe fundamenty architektoniczne: API design, mikroserwisy, kolejki, zdarzenia, bezpieczeństwo usług Umiejętność pracy z bazami danych (SQL/NoSQL) oraz tworzenia złożonych integracji Samodzielność w prowadzeniu prac projektowych oraz zdolność do działania w obszarach bez gotowych rozwiązań Doświadczenie w pracy w środowiskach o podwyższonym rygorze bezpieczeństwa lub wysokiej dostępności usług Doświadczenie w pracy z technologiami Open Source Umiejętność czytania i rozumienia dokumentacji technicznej oraz proponowania rozwiązań Mile widziane Znajomość wyzwań związanych z low-latency, event-driven architecture, real-time processing. Znajomość technologii blockchain (Ethereum, Hyperledger, Cosmos, Substrate itp.). Znajomość zagadnień ITIL lub posiadanie podstawowych certyfikatów. Rozumienie tokenizacji aktywów, modeli emisji, systemów rejestrów. Praca z agentami AI, orchestratorami, RAG, systemami wektorowymi. Tworzenie botów lub API do automatycznych agentów wykonujących procesy decyzyjne. To oferujemy Pracę przy jednym z najważniejszych systemów płatniczych w Polsce, który codziennie obsługują miliony użytkowników. Realny wpływ na bezpieczeństwo i dostępność usług płatniczych. Możliwość rozwoju kompetencji technicznych i operacyjnych. Przyjazne środowisko, nastawione na współpracę i ciągłe doskonalenie. Elastyczne godziny pracy oraz model hybrydowy. Pakiet benefitów (opieka medyczna, ubezpieczenie, język angielski, platforma e-learningowa, MyBenefit, MultiSport). Budżet rozwojowy i dostęp do szkoleń branżowych.

🏢 Summary: Entry-level Backend Engineer role focused on supporting the development of backend services and REST APIs under senior guidance. The position involves contributing to production systems, writing tested and maintainable code, and collaborating within a cross-functional engineering team. Ideal for candidates with foundational Java experience seeking hands-on experience in scalable and secure systems. 🗂️ Requirements: Bachelor's degree in Computer Science or related field (or currently pursuing), Minimum 0.5 years of Java experience, Practical experience with RESTful APIs, Ability to work with HTTP methods, status codes, and JSON, Experience writing SQL queries (SELECT, JOIN, WHERE, GROUP BY) or using ORM, Basic understanding of SQL and NoSQL differences, Knowledge of data structures and algorithms, Ability to use Git in a team environment (branching, pull requests, merge conflicts), Experience writing unit tests, Experience contributing code to production through review and deployment process 📃 Skills: Java, REST, HTTP, JSON, SQL, NoSQL, ORM, Git, JUnit, Pytest, Jest, CI, Algorithms, DataStructures, APIs, Testing 🏢 Description: (5190) About This Role You will be a part of the Engineering team and reports to our Manager, Engineering. You will support the development of backend services and APIs that power customer’s products. Working under close guidance from experienced engineers, you will gain hands-on experience contributing to real-world systems while learning best practices in software development, scalability, and security. Key Responsibilities Support the development of backend services and APIs under direct supervision of senior engineers Assist with writing clean, maintainable, and well-documented code following team standards Help debug, test, and troubleshoot backend systems and services Contribute to small tasks or components within larger projects Collaborate with cross-functional teams including Frontend, Product, and DevOps Participate in code reviews and apply feedback to improve technical skills Assist in writing unit tests and validating functionality Document technical processes and development work Required Qualifications Bachelor's degree in Computer Science or a related field; Currently pursuing is also an option Strong theoretical knowledge of Java, at least 0.5 years of experience Practical experience building and consuming RESTful APIs — HTTP methods, status codes, JSON, request/response handling, basic error handling. Working knowledge of databases — has written real SQL queries (SELECT, JOIN, WHERE, GROUP BY) or used an ORM in production code; understands the difference between SQL and NoSQL at a basic level. Solid understanding of data structures and algorithms — arrays, hash maps, trees, basic Big-O analysis — sufficient to discuss simple coding problems and reason about correctness. Comfortable with Git in a team setting — branching, pull requests, code review, addressing feedback, resolving merge conflicts; has worked in a shared repository with at least one other developer. Hands-on experience writing unit tests for their own code (pytest, JUnit, Jest, or equivalent), and basic familiarity with how testing fits into a CI pipeline. Demonstrated ability to ship code to production — even small features or bug fixes — through a real review and deployment process; ability to clearly describe what they built, how it was reviewed, and how it was tested. Genuine interest in cryptocurrency, blockchain, or Web3 (self-taught is fine — owning crypto, reading, side projects, hackathons) and willingness to learn the regulated FinTech context; English level: Upper-intermediate or higher, sufficient for daily team communication and code review discussions. Bonus: exposure to Linux / command line, Docker basics, message queues (Kafka, RabbitMQ), cloud platforms (AWS, GCP), open-source contributions, hackathon participation, or an active public GitHub portfolio.

🏢 Summary: The offer is for a Full Stack .NET Developer responsible for building scalable backend services and RESTful APIs within domain-driven and event-driven architectures, as well as developing responsive frontend interfaces. The role involves working with microservices or modular monoliths, implementing asynchronous integrations, and ensuring high code quality through testing and CI/CD practices. The position requires close collaboration in an agile environment and contribution to architectural decisions. 🗂️ Requirements: Minimum 3 years of experience in similar role, Very good knowledge of ASP.NET WebAPI (.NET Core), Very good knowledge of React, Very good knowledge of TypeScript, Experience with Unit Testing, Very good knowledge of Git, Very good knowledge of SQL Server or Azure SQL, Experience with EF Core, Experience with CI/CD pipelines, Experience with containerised deployments, Experience with event-driven architecture, Good command of English 📃 Skills: C#, .NET, ASP.NET, WebAPI, React, TypeScript, SQL, SQLServer, AzureSQL, EFCore, Git, CI/CD, Docker, Microservices, REST, UnitTesting 🏢 Description: Responsibilities: Designing and implementing scalable backend services and RESTful APIs within a domain-driven and event-driven architecture context, including both modular monolith and microservices approaches Building and maintaining responsive frontend interfaces, ensuring seamless integration with backend systems Contributing to architectural decisions and participating in collaborative design sessions to align technical solutions with business requirements Writing and maintaining unit, integration, and end-to-end tests. Ensuring code quality through thorough code reviews and adherence to team standards Working with CI/CD pipelines, containerised deployments, and infrastructure as code Implementing asynchronous communication patterns and event-based integrations between services Configuring and utilising monitoring and observability tools for application diagnostics and performance analysis Collaborating within an agile team, working closely with business analysts to refine requirements, and actively participating in sprint ceremonies Requirements: At least 3 years of experience on a similar position Very good knowledge of ASP.NET WebAPI (.NET Core) Very good knowledge of React, TypeScript Very good knowledge or experience in Unit Testing and GIT Very good knowledge of SQL Server/Azure SQL, EF Core Good command of English Offer: Constant support of dedicated consultant Employee referral program

🏢 Summary: Remote Senior PHP Backend Engineer role focused on developing scalable backend services, REST APIs, and AI-powered integrations using modern PHP frameworks and LLM tools. The position involves architecture improvements, AI automation, database management, and collaboration across product and engineering teams. The offer includes work on an AI/ML platform with influence over technical decisions and modern cloud and backend technologies. 🗂️ Requirements: Commercial experience as a PHP Backend Engineer or Senior PHP Developer, PHP 8+, Symfony or Laravel, REST APIs, Backend architecture, MySQL or PostgreSQL, Redis, Queues, Messaging systems, AI or LLM tools, OpenAI API, Prompt engineering, English for technical communication 📃 Skills: PHP, Symfony, Laravel, REST, MySQL, PostgreSQL, Redis, Elasticsearch, OpenAI, Claude, GitHubCopilot, TypeScript, JavaScript, NestJS, Docker, Kubernetes, AWS, CI/CD, RabbitMQ, Kafka, OAuth2, JWT, DDD, CQRS 🏢 Description: ✅ Your responsibilities: ・Designing and developing backend services using PHP and modern backend frameworks ・Building and maintaining REST APIs , integrations and business logic for production systems ・Working with databases such as MySQL / PostgreSQL / Redis / Elasticsearch ・Supporting the development of AI-powered features using LLMs, OpenAI API, Claude or similar tools ・Working on AI automation, prompt engineering and backend integrations with AI services ・Improving application architecture, scalability, maintainability and performance ・Collaborating with product, engineering and business teams to translate requirements into technical solutions ・Taking ownership of technical decisions and supporting less experienced developers when needed ・Participating in code reviews, technical discussions and delivery planning 🧠 Our requirements: ・Strong commercial experience as a PHP Backend Engineer / Senior PHP Developer ・Very good knowledge of PHP 8+ and modern backend development practices ・Experience with frameworks such as Symfony and/or Laravel ・Good understanding of REST APIs , integrations and backend architecture ・Experience with relational databases, especially MySQL or PostgreSQL ・Experience with Redis , queues, messaging or background processing ・Practical interest or hands-on experience with AI / LLM tools, such as OpenAI API, Claude, GitHub Copilot, prompt engineering or AI automation ・English at a level allowing daily technical communication ⭐ Nice to have: ・Experience with TypeScript / JavaScript / NestJS ・Experience with Docker, Kubernetes, AWS or CI/CD pipelines ・Knowledge of RabbitMQ, Kafka or Symfony Messenger ・Understanding of software security topics such as OAuth2, JWT and input validation ・Experience with architectural approaches such as DDD, CQRS, Event Sourcing or Hexagonal Architecture 🌟 What we offer: ・100% remote work. ・Opportunity to work on a modern AI / ML product platform. ・Private healthcare and Multisport. ・Life insurance. ・Real influence on technical decisions and architecture. ・Exposure to modern AI, data, and product engineering challenges. ・Collaborative and supportive team environment.

🏢 Summary: Senior PHP Backend Engineer role focused on building and scaling backend services for a modern AI-driven product platform. The position involves developing REST APIs, integrating AI/LLM services, and improving system architecture, performance, and scalability. You will contribute to technical decisions and support AI automation initiatives in a fully remote environment. 🗂️ Requirements: Strong commercial experience as PHP Backend Engineer or Senior PHP Developer, Very good knowledge of PHP 8+, Experience with Symfony and/or Laravel, Experience designing and developing REST APIs, Experience with MySQL or PostgreSQL, Experience with Redis, queues or background processing, Hands-on experience with AI/LLM tools (OpenAI API, Claude), Experience with backend architecture and integrations, English proficiency for daily technical communication 📃 Skills: PHP, Symfony, Laravel, REST, MySQL, PostgreSQL, Redis, Elasticsearch, OpenAI, Claude, LLM, AI, Git, Docker, Kubernetes, AWS, RabbitMQ, Kafka, OAuth2, JWT, TypeScript, JavaScript, NestJS, CI/CD 🏢 Description: ✅ Your responsibilities: ・Designing and developing backend services using PHP and modern backend frameworks ・Building and maintaining REST APIs , integrations and business logic for production systems ・Working with databases such as MySQL / PostgreSQL / Redis / Elasticsearch ・Supporting the development of AI-powered features using LLMs, OpenAI API, Claude or similar tools ・Working on AI automation, prompt engineering and backend integrations with AI services ・Improving application architecture, scalability, maintainability and performance ・Collaborating with product, engineering and business teams to translate requirements into technical solutions ・Taking ownership of technical decisions and supporting less experienced developers when needed ・Participating in code reviews, technical discussions and delivery planning 🧠 Our requirements: ・Strong commercial experience as a PHP Backend Engineer / Senior PHP Developer ・Very good knowledge of PHP 8+ and modern backend development practices ・Experience with frameworks such as Symfony and/or Laravel ・Good understanding of REST APIs , integrations and backend architecture ・Experience with relational databases, especially MySQL or PostgreSQL ・Experience with Redis , queues, messaging or background processing ・Practical interest or hands-on experience with AI / LLM tools, such as OpenAI API, Claude, GitHub Copilot, prompt engineering or AI automation ・English at a level allowing daily technical communication ⭐ Nice to have: ・Experience with TypeScript / JavaScript / NestJS ・Experience with Docker, Kubernetes, AWS or CI/CD pipelines ・Knowledge of RabbitMQ, Kafka or Symfony Messenger ・Understanding of software security topics such as OAuth2, JWT and input validation ・Experience with architectural approaches such as DDD, CQRS, Event Sourcing or Hexagonal Architecture 🌟 What we offer: ・100% remote work. ・Opportunity to work on a modern AI / ML product platform. ・Private healthcare and Multisport. ・Life insurance. ・Real influence on technical decisions and architecture. ・Exposure to modern AI, data, and product engineering challenges. ・Collaborative and supportive team environment.

🏢 Summary: Fullstack Engineer role focused on building and scaling a global data-driven insights platform using modern JavaScript technologies. The position involves developing backend and frontend services, designing scalable databases, and influencing system architecture. You will work on high-load systems, ensure code quality, and contribute to technical decisions and mentoring. 🗂️ Requirements: 5+ years of experience with JavaScript and Node.js, 3+ years of experience with TypeScript and React or Next.js, Hands-on experience with scalable backend systems, Experience designing SQL and NoSQL database schemas, Ability to optimize queries for high-load systems, Knowledge of web fundamentals and networking concepts, Understanding of OWASP security best practices, Experience with AWS cloud services, Experience writing unit, integration, and e2e tests, Professional proficiency in English 📃 Skills: JavaScript, Node.js, TypeScript, React, Next.js, REST, GraphQL, SQL, NoSQL, AWS, CORS, OWASP, Microservices, Serverless 🏢 Description: We’re building a data-driven insights platform used by professionals worldwide. Our mission is to turn complex data into actionable insights and empower teams to make better decisions. We value ownership, technical excellence, and collaboration . If you enjoy building scalable systems, mentoring engineers, and shaping software architecture, you’ll fit right in. 🎯 Your mission Develop and maintain backend and frontend services (REST/GraphQL APIs, React apps) Design scalable database schemas (SQL & NoSQL) and optimize queries for high-load systems Collaborate with product, design, and DevOps teams to deliver robust solutions Write clean, tested code (unit, integration, e2e) Influence architecture and technical decisions Mentor other developers and share best practices 📌 You should have 5+ years in JavaScript / Node.js 3+ years in TypeScript + React/Next.js Hands-on experience with scalable backend systems Knowledge of web fundamentals & networking (CORS, browser behavior) Understanding of security best practices (OWASP) Experience with cloud services (AWS preferred) Strong communication skills in English Ability to work independently and take ownership ✨ Nice to have Experience with microservices / serverless architectures Data pipelines, scraping, or data-heavy applications Team leadership or mentoring experience Exposure to AI/ML integrations 💡 Why join us High-impact role on a global data platform Work with modern technologies and best engineering practices Autonomy & ownership in your work Collaborative and experienced team Competitive employment package and benefits.

🏢 Summary: The offer is for a Back End Developer responsible for building and maintaining APIs, backend services, and scalable system architecture within the .NET ecosystem. The role focuses on designing microservices-based solutions, integrating databases and third-party services, and ensuring high performance, security, and reliability. It includes remote work options under a B2B contract. 🗂️ Requirements: Strong knowledge of backend technologies, especially .NET ecosystem, Experience with .NET 8+ and ASP.NET Core, Experience with relational databases (PostgreSQL or MySQL), Experience with NoSQL databases (MongoDB), Experience building RESTful APIs using Swagger / OpenAPI, Experience with Microservices Architecture, Experience with RabbitMQ for message queuing, Experience with Docker and Kubernetes, Experience with Auth0 and JWT-based authentication, Experience with cloud services (AWS, Azure or GCP) 📃 Skills: .NET, ASP.NET, C#, PostgreSQL, MySQL, MongoDB, REST, Swagger, OpenAPI, Microservices, RabbitMQ, Docker, Kubernetes, Auth0, JWT, AWS, Azure, GCP 🏢 Description: Description The Back End Developer will develop and maintain APIs, services, and server-side logic and databases. You'll contribute to system architecture and help scale our platforms. You will ensure high performance and responsiveness of applications, working alongside frontend developers and other team members. Responsibilities Design, build and implement backend services and APIs Design data models and manage database integration Integrate with databases and third-party APIs Implement security and data protection measures Optimize performance and security of systems Requirements Strong knowledge of backend technologies / languages, particularly .NET ecosystem Experience in .NET 8+ (or latest version), including ASP.NET Core for building web APIs and services. Experience with relational databases, such as PostgreSQL, MySQL for structured data, complex queries, and ACID compliant operations Experience with NoSQL databases, such as MongoDB, for handling unstructured or semi-structured data, schema flexibility, and high-throughput scenarios Experience with RESTful APIs for development of robust, secure RESTful services with best practice for APU design, versioning and documentation, using Swagger / Open API Experience in Microservices Architecture, for design, implementation, and management of distributed systems using microservices principles, ensuring loose coupling, scalability, and resilience Experience in Message Queuing:, using RabbitMQ for asynchronous communication, event-driven architecture, and reliable message brokering between services Experience in Containerization and Orchestration, using Kubernetes (K8s) for deploying, scaling, and managing containerized applications in production environments and Docker for containerization Experience in Authentication, using Auth0 for identity management, JWT-based authentication Experience in Cloud Services, such as AQS, Azure, GC Nice to have Experience in Rabbit MQ Middleware Prior experience in the EdTech domain (e-learning platforms, digital classrooms, LMS) Knowledge of learning science, instructional design, or accessibility standards (e.g., WCAG) Familiarity with tools like Moodle, Canvas, Zoom SDK, or Google Classroom integration Working conditions Partly / fully remote B2B contract

🏢 Summary: The role involves developing and maintaining scalable full-stack web applications using .NET and modern frontend frameworks. You will design robust Web APIs, optimize databases, and implement clean, testable code within CI/CD-driven environments. The position requires active participation in the full software development lifecycle for international projects. 🗂️ Requirements: Minimum 3 years commercial experience with .NET (C#, Web API, Entity Framework), Proficiency in Angular or React, Strong knowledge of JavaScript, HTML, CSS, Experience with SQL Server or PostgreSQL, Understanding of Unit Testing, Experience with Git, Experience with CI/CD pipelines, Knowledge of design patterns, Knowledge of software development best practices, Fluent English (min. B2), Availability for hybrid work mode 📃 Skills: .NET, C#, WebAPI, EntityFramework, Angular, React, JavaScript, HTML, CSS, SQL, SQLServer, PostgreSQL, UnitTesting, Git, CI/CD 🏢 Description: As a member of our development team, you will be responsible for building scalable web applications, designing robust APIs, and creating intuitive user interfaces. We value clean code, analytical thinking, and a proactive approach to technology. Our expectations: Minimum 3 years of commercial experience in .NET (C#, Web API, Entity Framework). Proficiency in Angular or React, along with JavaScript, HTML, CSS, and modern frontend libraries. Strong experience with relational databases such as SQL Server or PostgreSQL. Solid understanding of Unit Testing, Git, and CI/CD pipelines. Practical knowledge of design patterns and software development best practices. A collaborative mindset and the ability to explain complex technical issues clearly. Strong analytical skills and a "get it done" attitude. Fluent English (min. B2) for smooth collaboration with international partners. Open to work in hybrid mode. Main responsibilities: You will design, develop, and maintain scalable full-stack applications using .NET and modern frontend frameworks (Angular/React) for diverse client projects. You will be responsible for writing clean, testable code and implementing unit tests to ensure the highest software performance and reliability. You will work closely with cross-functional teams to architect robust Web APIs and optimize database schemas while following industry best practices and design patterns. You will actively participate in the full software development life cycle, including CI/CD processes and version control management, to ensure seamless project delivery.