Senior .NET Developer

🏢 Summary: Senior Backend Engineer role focused on designing and delivering scalable, production-ready software using Node.js and AWS. The position involves leading development of complex solutions, ensuring high performance, reliability, and security, and integrating monitoring and testing practices. The engineer collaborates in agile teams to translate product requirements into resilient cloud-based applications. 🗂️ Requirements: Strong experience with Node.js and TypeScript, Proficiency with AWS services (Lambda, SNS/SQS, API Gateway, CDK), Experience with TDD and QA best practices, Ability to design and build highly scalable applications, Experience with monitoring, performance, scalability, and security, Experience conducting code reviews and delivering production-ready code, Ability to integrate monitoring and support tools, Experience contributing to test frameworks 📃 Skills: Node.js, TypeScript, AWS, Lambda, SNS, SQS, API Gateway, CDK, TDD, QA, Monitoring, Scalability, Security, Agile 🏢 Description: We are looking for a Senior Backend Engineer (Node.js / AWS) who: Has strong experience with TDD and solid understanding of QA best practices. Can handle operational challenges : monitoring, performance, scalability, availability, resilience, and security. Translates product requirements into reliable, scalable software . Has excellent development skills and experience building highly scalable applications . Is proficient in Node.js, TypeScript , and AWS services like Lambda, SNS/SQS, API Gateway , and CDK . What you’ll do: Lead development of complex software solutions. Conduct code reviews and deliver production-ready code . Integrate software with monitoring/support tools . Collaborate with architects and technical leads, participate in agile processes . Contribute to test frameworks , troubleshoot issues, and ensure smooth team collaboration.

🏢 Summary: Senior Backend Engineer role focused on designing and developing scalable, reliable backend services using Java. The position involves working in a cross-functional team to build high-performance systems, improve architecture, and support CI/CD and production environments. 🗂️ Requirements: 5+ years Backend Engineering experience, Strong Java proficiency, Solid knowledge of databases and SQL, Experience with RESTful APIs, Experience with microservices architecture, Experience with high-load systems, Experience with Docker and Kubernetes, Experience with AWS or GCP, Knowledge of CI/CD pipelines, Understanding of Agile practices 📃 Skills: Java, SQL, REST, Microservices, Docker, Kubernetes, AWS, GCP, CI/CD, Golang, Python 🏢 Description: We are looking for a Senior Backend Engineer with strong Java experience to help us design and develop scalable solutions. You will work in a cross-functional team, building reliable services and contributing to the continuous improvement of our systems. This role is ideal for someone who enjoys solving complex problems and driving technical excellence. 💼 Responsibilities: Design, develop, and maintain backend features and services. Collaborate with teams to define requirements and integrate systems. Ensure performance, scalability, and reliability of applications. Contribute to CI/CD processes and support production systems. Write clear documentation and share knowledge within the team. ✅ Requirements: 5+ years of experience as a Backend Engineer, with strong Java skills (Golang/Python is a plus). Solid understanding of databases and SQL. Experience with RESTful API design, microservices, and high-load systems. Familiarity with Docker, Kubernetes, and cloud environments (AWS/GCP). Knowledge of CI/CD pipelines and Agile practices. Strong problem-solving and communication skills. 🎁 We offer: Stable employment in a fast-growing company. Flexible and remote-friendly working model. Health and wellbeing benefits. Learning and development opportunities. Modern equipment and comfortable work environment.

🏢 Summary: Senior Backend Engineer role focused on designing and developing modern financial applications and advanced monitoring systems in AWS cloud environments. The position involves backend development using C# and .NET technologies, applying DDD and CQRS patterns, and contributing to cloud-based banking solutions. The engineer works on scalable web applications and cloud services supporting operational processes. 🗂️ Requirements: 5+ years of commercial experience in web application development, Strong experience in C# development, Experience with SQL databases, Experience building web applications using .NET technologies, Professional proficiency in English 📃 Skills: C#, .NET, ASP.NET, AWS, Fargate, Lambda, S3, EventBridge, SQL, NoSQL, Jira, Confluence, Git, Rider, VisualStudio, DDD, CQRS 🏢 Description: The scope of your role: As a Senior Backend Engineer, you will take part in the process of the design and development of modern financial applications. You will develop advanced monitoring systems used in running operations in the AWS cloud environments. You will have an impact on our applications by working closely with businesses and clients who use our banking products. You will work with C#, .NET, ASP.NET, AWS ( incl. fargate, lambda, S3, event bridge), Jira, Confluence, Git, and Rider/Visual Studio. You will use DDD and CQRS. You will work using modern AI dev tools. Required qualifications: 5+ years of commercial experience in creating web applications. Solid experience developing applications using C#. Solid experience in working with SQL databases. Willingness and interest to collaborate and work in a team. Preferred qualifications: Experience with software engineering best practices (code reviews, continuous integration, continuous deployment, testing). Exposure to Agile development methodologies. Familiar with Web services/web API. Familiar with the AWS platform. Experience in working with NoSQL databases. About you? You are a creative and curious person with a genuine interest in software development. We are always looking for new knowledge and have a curiosity out of this world, we think that you have the same mindset and you are excited to read about the latest tech trends. You might also, like us, love to write nice and high-quality code. We hope you are not afraid to inform us about problems and have your thoughts on various solutions. You are a team player and used to work in an Agile environment. Since we are a multicultural team English is the required language.

🏢 Summary: The offer is for a Senior Backend Engineer responsible for designing and developing modern financial applications and advanced monitoring systems in AWS cloud environments. The role involves working with C# and .NET technologies, applying DDD and CQRS patterns, and collaborating closely with business stakeholders in an Agile team. The position focuses on building high-quality, scalable backend solutions using modern development and AI tools. 🗂️ Requirements: 5+ years of commercial experience in creating web applications, Strong experience with C# development, Experience working with SQL databases, Ability to work collaboratively in a team, Fluency in English 📃 Skills: C#, .NET, ASP.NET, AWS, Fargate, Lambda, S3, EventBridge, SQL, NoSQL, DDD, CQRS, Git, Jira, Confluence, Rider, VisualStudio, WebAPI, CI, CD 🏢 Description: The scope of your role: As a Senior Backend Engineer, you will take part in the process of the design and development of modern financial applications. You will develop advanced monitoring systems used in running operations in the AWS cloud environments. You will have an impact on our applications by working closely with businesses and clients who use our banking products. You will work with C#, .NET, ASP.NET, AWS ( incl. fargate, lambda, S3, event bridge), Jira, Confluence, Git, and Rider/Visual Studio. You will use DDD and CQRS. You will work using modern AI dev tools. Required qualifications: 5+ years of commercial experience in creating web applications. Solid experience developing applications using C#. Solid experience in working with SQL databases. Willingness and interest to collaborate and work in a team. Preferred qualifications: Experience with software engineering best practices (code reviews, continuous integration, continuous deployment, testing). Exposure to Agile development methodologies. Familiar with Web services/web API. Familiar with the AWS platform. Experience in working with NoSQL databases. About you? You are a creative and curious person with a genuine interest in software development. We are always looking for new knowledge and have a curiosity out of this world, we think that you have the same mindset and you are excited to read about the latest tech trends. You might also, like us, love to write nice and high-quality code. We hope you are not afraid to inform us about problems and have your thoughts on various solutions. You are a team player and used to work in an Agile environment. Since we are a multicultural team English is the required language.

🏢 Summary: Back-End Engineer role focused on building and maintaining cloud-native compliance and monitoring systems for financial environments. The position involves developing scalable, distributed backend services in C#/.NET Core running on AWS and Kubernetes. You will contribute to a modern, evolving tech stack with strong emphasis on solid backend engineering fundamentals. 🗂️ Requirements: Strong experience with C# and .NET Core, Hands-on experience with AWS, Hands-on experience with Kubernetes, Understanding of distributed systems, Experience building backend services, Experience with cloud-native architectures 📃 Skills: C#, .NET, AWS, Kubernetes, Lambda, S3, Kafka, Redis, Airflow, gRPC, Snowflake, SQLServer, OpenTelemetry 🏢 Description: Back-End Engineer (.NET | AWS | Kubernetes) We’re looking for a Back-End Engineer (regular or senior level) to join a team building cloud-native compliance/monitoring systems used in financial environments. You’ll work on backend services in C#/.NET Core , contributing to scalable, distributed platforms running on AWS and Kubernetes . The tech stack is modern and evolving — the more exposure to new technologies, the better, though solid backend fundamentals matter most. We’re looking for: Strong backend experience with C#/.NET Hands-on AWS and Kubernetes (preferred) Understanding of distributed systems Experience with compliance or monitoring systems is a big plus Openness to working with modern, cloud-native technologies Tech environment includes: .NET Core / C#, AWS (Lambda, S3), Kubernetes, Kafka, Redis, Airflow, gRPC, Snowflake, SQL Server, OpenTelemetry. Why join: Work on mission-critical systems supporting compliance and market integrity High engineering standards, ownership, and stability Flexible, pragmatic technical leadership

🏢 Summary: Senior Backend Engineer role focused on designing and scaling a high-throughput, event-driven platform. The position centers on building and optimizing large-scale event processing services and APIs in distributed systems. It involves solving complex scalability and reliability challenges in a massive-scale environment. 🗂️ Requirements: Senior-level experience in backend development, Strong Python expertise, Experience scaling message queue systems, Experience with distributed systems and microservices architecture, Proven track record building high-throughput backend services, Experience designing scalable and fault-tolerant systems, Ability to implement and optimize APIs 📃 Skills: Python, Azure, ServiceBus, StorageQueues, EventHubs, Microservices, DistributedSystems, APIs, EventDriven, EventSourcing, Streaming, Observability, Monitoring 🏢 Description: Location: Remote Type: Full-time Level: Senior Duration: 4 months Start: ASAP We are looking for an experienced Senior Backend Engineer to join a team responsible for building and scaling a high-throughput, event-driven platform operating at massive scale. Your primary focus will be the event processing backbone — designing, developing, and optimizing services that handle large volumes of messages reliably and efficiently. You will work closely with architects and other senior engineers to implement APIs that expose data and support advanced triage and processing workflows. This role is ideal for someone who enjoys solving hard scalability problems , working with distributed systems, and building resilient backend services that operate under real-world load. Responsibilities Design and build backend services responsible for large-scale event processing Optimize and scale message-based systems to handle high throughput and reliability requirements Implement APIs defined by system architects to expose data and collect processing results Collaborate with cross-functional teams to improve platform performance and resilience Contribute to architectural decisions around scalability, fault tolerance, and observability Core Skills Strong experience with Python as a primary backend language Deep expertise in scaling message queue systems (e.g. Azure Service Bus, Storage Queues, Event Hubs or similar) Solid understanding of microservices architecture and distributed systems Proven experience building high-throughput, resilient backend services Strong problem-solving skills and ability to work with complex systems Highly Desirable Experience with event-driven or event sourcing architectures Background in data processing frameworks or streaming systems Experience building platforms related to observability, monitoring, or large-scale event management Familiarity with designing systems for fault tolerance and graceful degradation What we offer Work on technically challenging systems operating at very large scale High level of autonomy and real influence on system architecture Collaboration with experienced engineers in a mature engineering environment Competitive compensation and flexible working model Project with strong technical ownership

🏢 Summary: Senior Backend Engineer role focused on designing and developing cloud‑enabled web applications, APIs, and digital twin solutions for large-scale data center environments using Azure and NVIDIA Omniverse. The position involves full software development lifecycle responsibilities and collaboration with international teams on global simulation and visualization platforms. 🗂️ Requirements: 7+ years of experience in software development with .NET / .NET Core, Strong C# and .NET programming skills, Experience with REST API development, Experience with Entity Framework or other ORM, Knowledge of relational and non-relational databases, Experience with SQL Server, Experience with Azure cloud services, Proficiency with Git or similar version control systems, Experience processing large datasets, Knowledge of Infrastructure as Code (Terraform preferred) 📃 Skills: C#, .NET, .NETCore, REST, EntityFramework, SQLServer, Azure, AppServices, AzureSQL, AzureFunctions, ServiceBus, Git, Terraform, Omniverse, ORM 🏢 Description: We are seeking a Senior Backend Engineer who will work with local teammates as well as collaborate closely with our U.S.-based project management and development teams, contributing to the design and implementation of modern cloud‑enabled web applications, APIs, and digital twin solutions for large‑scale data center environments. This is a unique opportunity to work on global projects, leverage cutting‑edge technologies such as Azure Cloud and NVIDIA Omniverse APIs, and help shape the future of our next‑generation simulation and visualization platforms. Key Responsibilities Develop and maintain applications using .NET / .NET Core, and Azure cloud services Contribute to the development of digital twin components, including data ingestion, simulation logic, and integration with Omniverse APIs Collaborate with project managers and developers to ensure alignment with client requirements Participate in all stages of the software development lifecycle: design, coding, testing, debugging, and documentation Write clean, efficient, secure, and maintainable code following best practices Liaise with system analysts and business owners to refine requirements and improve applications Work with Azure services such as App Services, Azure SQL, Azure Functions, or Service Bus (depending on project needs) Requirements 7+ years of experience in software development (.NET / .NET Core, Entity Framework (or other ORM), REST APIs)) Strong C# / .NET programming skills and design principles Familiarity with relational/non relational database design and development (SQL Server preferred) Knowledge of Entity Framework or other ORM tools Proficiency with GitHub or similar version control systems Experience with processing large amounts of data Strong English communication skills, both spoken and written, enabling clear explanation of technical topics Ability to work independently and in a collaborative team environment Knowledge of IaC (Terraform preferred) Ideally You’ll Also Have Interest or experience in cloud‑based simulation, IoT, or digital twin technologies Exposure to Agile methodologies (Scrum) Microsoft Certified Developer Associate or Azure certification We offer Rewarding employment: Full-time employment with a salary that matches your qualifications Hybrid work model: Enjoy the flexibility of working from home, with just several office days per month Flexible hours: Start your day anytime between 7:30 and 10:00 AM Comprehensive benefits: Including Lux Med medical care, psychological support, life insurance, My Benefit cafeteria system, Multisport card co-financing, and a car/bike park sharing system Co-financed holidays: Enjoy "Wczasy pod Gruszą" for a well-deserved break Global projects: Engage in exciting international projects Inclusive networks: Join our diverse employee networks like Women's Network, OneWorld, PRISM, Careers Network, Green Team, SpeakUp, Collectively, and more Continuous learning: Participate in our Graduate Development Program, Learners’ Community, and self-learning platforms Language courses: Enhance your skills with courses in English, German, and Polish

🏢 Summary: Backend Engineer role focused on designing, building, and maintaining scalable backend services in a cloud-native AWS environment. The position involves developing production-grade APIs and services using TypeScript and .NET, with strong emphasis on CI/CD, Infrastructure as Code, and cloud-native best practices. The role supports secure, scalable backend systems with close collaboration across platform and operations teams. 🗂️ Requirements: Strong experience building and maintaining scalable APIs and backend services, Hands-on experience with CI/CD pipelines using GitHub Actions or GitHub Workflows, Strong development experience with TypeScript, Strong development experience with .NET (C#), Experience deploying and operating workloads in AWS Cloud, Experience using Terraform for Infrastructure as Code, Experience designing and consuming RESTful APIs or event-driven services, Understanding of cloud-native patterns, Experience with relational databases and SQL, Fluent English 📃 Skills: TypeScript, .NET, C#, AWS, Terraform, SQL, REST, CI/CD, GitHub, GitHubActions, APIs, IAM, Lambda, ECS, Fargate 🏢 Description: We are looking for a Backend Engineer to design, build, and maintain backend services in a modern cloud-native AWS environment. Core skills & experience: Strong experience as a Backend Developer, building and maintaining scalable APIs and backend services Hands-on experience with CI/CD pipelines, preferably using GitHub Actions / GitHub Workflows Strong development experience with TypeScript and .NET (C#), including building and operating production services Familiarity with AWS Cloud, including deploying and operating backend workloads in AWS Experience using Terraform for Infrastructure as Code (IaC) Related technologies / domain knowledge: Experience designing and consuming RESTful APIs and/or event-driven backend services Understanding of cloud-native patterns (stateless services, scaling, resiliency, observability) Experience working with relational databases (SQL) and backend integrations Nice-to-have / preferred experience: Experience with containerized workloads (e.g. ECS Fargate or similar) Experience with Lambda functions Familiarity with IAM and AWS security best practices Exposure to data platforms or ETL-heavy environments Experience working in environments with high operational and security requirements General expectations: Able to take ownership of backend services from development through production Comfortable working closely with platform, data, and operations engineers Focused on clean code, automation, and reliable delivery through CI/CD Used to working with SCRUM principles, preferably in JIRA Fluent English Other Details: The role is designed for a cloud-native environment, supporting development across various backend services focused on scalability and security.

🏢 Summary: Senior Software Engineer role focused on developing and maintaining a complex enterprise .NET platform, combining backend development, production troubleshooting, and performance optimization. The position involves working on identity-related systems and improving architecture, reliability, and code quality within a large-scale environment. The engineer will contribute to technical decisions and future platform evolution. 🗂️ Requirements: 5+ years commercial experience with C# and .NET, Strong knowledge of ASP.NET Core, Experience with asynchronous programming, Experience with dependency injection, Hands-on experience with Entity Framework Core, Strong understanding of SQL Server, Experience with query optimization, Experience with OAuth2, Experience with OpenID Connect, Experience with JWT, Experience supporting and troubleshooting production systems, Fluent English 📃 Skills: C#, .NET, ASP.NET, EntityFramework, SQLServer, OAuth2, OpenIDConnect, JWT, IdentityServer, Duende, ActiveDirectory, AzureAD, MicrosoftGraph, Quartz.NET, SignalR, Playwright, AzureDevOps, CI/CD 🏢 Description: We are looking for an experienced Senior Software Engineer to develop and maintain a complex enterprise .NET platform used by global organizations. This role combines backend development , production troubleshooting , performance optimization , and work on identity-related systems . 💼 Responsibilities: Design, develop, and maintain backend services built with C# and .NET Investigate and resolve complex production issues and customer-reported problems Optimize application performance, database queries, and system reliability Collaborate with Product, Support, and Engineering teams on technical solutions Improve architecture, code quality, and engineering standards Participate in technical discussions and contribute to future platform development ✅ Requirements: 5+ years of commercial experience with C# and .NET Strong knowledge of ASP.NET Core and modern .NET applications Experience with asynchronous programming and dependency injection Hands-on experience with Entity Framework Core Good understanding of SQL Server, query optimization, and database performance Experience with OAuth2, OpenID Connect, JWT Experience supporting and troubleshooting production systems Fluent English communication skills 🌟Nice to have: Experience with IdentityServer / Duende IdentityServer Understanding of Active Directory, Azure AD or Microsoft Graph Hands-on experience with Quartz.NET or similar scheduling frameworks Familiarity with SignalR, Playwright, Azure DevOps and CI/CD pipelines 🎁 We offer: Work on a mature enterprise product used globally Influence technical decisions and platform evolution Private healthcare Life insurance Multisport Opportunity to work with modern .NET technologies and large-scale systems

🏢 Summary: Senior Backend Engineer role focused on modernising and expanding a secure AWS serverless platform in the healthcare sector. The position involves building event-driven backend services, migrating Azure components to AWS, and integrating Salesforce within a compliant cloud environment. This is a hands-on remote contract role delivering production-grade solutions under tight timelines. 🗂️ Requirements: 4+ years backend engineering experience, 2+ years AWS serverless production experience, Strong commercial experience with Python or TypeScript, Hands-on experience with AWS Lambda, API Gateway, EventBridge, SQS, SNS, Step Functions, Experience with RDS, DynamoDB, S3, Secrets Manager, Terraform for application-level infrastructure, Salesforce API integration experience (REST or Platform Events), Strong knowledge of REST APIs and event-driven architectures, GitLab with CI/CD workflows, Familiarity with SOC 2 or HIPAA compliance 📃 Skills: Python, TypeScript, AWS, Lambda, APIGateway, EventBridge, SQS, SNS, StepFunctions, RDS, DynamoDB, S3, SecretsManager, Terraform, GitLab, CI/CD, Salesforce, REST, Azure, AzureFunctions, AzurePipelines 🏢 Description: Senior Backend Engineer (AWS Serverless) About the Role We’re looking for experienced Senior Backend Engineers to join a cloud modernisation project in the healthcare sector. The team is responsible for rebuilding and expanding a secure AWS-based platform, migrating selected Azure services, and delivering scalable integrations with Salesforce and other external systems. This is a hands-on engineering role focused on backend services, serverless infrastructure, and event-driven architectures. You’ll work closely with cloud engineers, platform teams, and stakeholders to deliver production-ready solutions under tight delivery timelines. The project includes both modernisation of existing systems and development of new integrations — this is not a greenfield environment. Contract Type: B2B Work Mode: 100% Remote Time Zone: CET/CEST (Poland) — occasional meetings after 18:00 Project Overview The client is operating in the medical industry and is currently modernising their cloud ecosystem to support secure and compliant data processing workflows. The engineering team will focus on: Building AWS serverless services and APIs Designing event-driven integrations with Salesforce Migrating Azure-based components to AWS Rebuilding repositories and CI/CD processes in GitLab Delivering secure architectures aligned with SOC 2 and HIPAA standards Technology Stack Backend & Cloud Python TypeScript AWS Lambda API Gateway Step Functions EventBridge SQS / SNS Data & Infrastructure RDS DynamoDB S3 AWS Secrets Manager Terraform GitLab CI/CD Integrations & Compliance Salesforce REST API Salesforce Platform Events SOC 2 HIPAA Confluence Jira Responsibilities Backend Engineering & Integrations Build and maintain scalable serverless services on AWS Design and implement Salesforce-to-EventBridge integration patterns Develop secure architectures for client file transfer and data synchronisation Create reusable integration standards for event-driven and bulk-processing workflows Design and maintain RESTful APIs and asynchronous processing pipelines Migration & Platform Modernisation Rebuild selected Azure Functions and Azure Pipelines within AWS environments Support repository migration and CI/CD transition to GitLab Contribute to infrastructure and deployment automation using Terraform Engineering Quality & Delivery Participate in code reviews and maintain production-grade engineering standards Create and maintain technical documentation in Confluence Work within agile delivery processes including daily standups, sprint reviews, and retrospectives Collaborate closely with cloud engineers and platform stakeholders What We’re Looking For Required Skills & Experience 4+ years of backend engineering experience 2+ years working with AWS serverless technologies in production Strong commercial experience with Python and/or TypeScript Hands-on experience with: AWS Lambda API Gateway EventBridge SQS / SNS Step Functions Experience with RDS, DynamoDB, S3, and Secrets Manager Terraform experience focused on application-level infrastructure Experience integrating Salesforce APIs (REST and/or Platform Events) Strong understanding of REST APIs and event-driven architectures GitLab experience including CI/CD integration workflows Familiarity with SOC 2 and/or HIPAA compliance requirements Experience creating production-level technical documentation Nice to Have Azure Functions or Azure Pipelines migration experience Healthcare or medical-sector project background Experience with ETL / ELT or bulk data processing pipelines API test automation experience