Senior Legacy Migration Engineer (C#, .Net)

🏢 Summary: Remote B2B opportunity for a Senior Software Engineer focused on developing complex, high-performance systems in modern C++ within Linux environments. The role involves contributing to product-level features, collaborating across teams, and working with cloud and backend technologies. Long-term cooperation with flexibility on financial expectations and start date. 🗂️ Requirements: 6+ years of hands-on experience in C++ development, Strong knowledge of modern C++, Experience with multithreading, Understanding of memory management, Experience with performance optimization, Strong understanding of Linux-based systems, Experience developing in Linux environment, Ability to deliver complex technical features, Bachelor’s degree in Science, Technology, Engineering or related field 📃 Skills: C++, Linux, Multithreading, MemoryManagement, PerformanceOptimization, Python, Go, AWS, Terraform, CloudFormation, REST, CI/CD, GitHub, Jenkins, Artifactory, Ansible, Networking, Security, Databases 🏢 Description: For our client, we are looking for a Senior Software Engineer (f/m/n). Qualifications 6+ years of hands-on experience in C++ development (modern C++ preferred) with a solid understanding of multithreading, memory management, and performance optimization Strong experience contributing to complex features with a good product-level understanding and exposure to diverse technologies Proven ability to collaborate effectively within a team, actively participating in technical discussions and supporting delivery across multiple contributors Strong understanding of Linux-based systems and experience developing in a Linux environment (user level) Demonstrated ability to take ownership of well-defined technical tasks and drive them to completion with high quality Strong interpersonal skills with the ability to communicate clearly, collaborate effectively, and contribute confidently in professional discussions Proven ability to quickly learn and adapt to new technologies, taking on tasks with a proactive, can-do attitude and a willingness to expand beyond the core tech stack, including Python, AWS and Go Highly self-managed and independent, capable of delivering results with limited supervision while aligning with broader team goals Bachelor’s degree in Science/Technology/Engineering or a related field How will you stand out from the crowd Experience with Go and/or Python programming languages Experience with cloud-native development and infrastructure-as-code tools (e.g., Terraform, CloudFormation) Experience in enterprise-scale application development in cloud or SaaS environments (AWS serverless architecture is a definite advantage) Experience in building fullstack applications, including REST API-based backend systems and modern frontend interfaces Familiarity with networking protocols, security principles, and database systems Experience with modern CI/CD pipelines, such as GitHub, Jenkins, Artifactory, and Ansible We offer: Work model: remote Contract type: B2B with SHIMI Long-term cooperation We are open to the candidate’s financial expectations Start: ASAP (up to 1 month notice)

🏢 Summary: Senior Software Engineer responsible for defining technical standards and architecture, leading backend and frontend development, and ensuring secure, scalable, and observable solutions. The role drives CI/CD, enterprise integrations, and production support while aligning engineering practices with product and operations goals. 🗂️ Requirements: Proven experience defining technical standards and architecture, Experience with CI/CD orchestration, Experience with observability implementation, Experience implementing on-premises, hybrid, and cloud solutions, Experience leading backend and frontend architectural decisions, Experience maintaining CI/CD pipelines, Experience coordinating enterprise integrations, Knowledge of DDD and clean architecture, Expertise in Java and Spring Boot, Expertise in Python and FastAPI, Expertise in React or Angular, Experience with L2/L3 production support, Experience with Spring Security and OAuth 📃 Skills: Java, SpringBoot, Python, FastAPI, React, Angular, CICD, Observability, ServiceNow, Jira, Boomi, DDD, OAuth, SpringSecurity 🏢 Description: To strengthen the team, we are seeking a person for the role of Senior Software Engineer, responsible for defining technical standards and architecture, guiding the development team, ensuring quality practices, security, and CI/CD, and collaborating with product and operations in delivering scalable, business-aligned solutions. Main Responsibilities Define technical standards, architecture, and development practices, ensuring quality, security, performance, and resilience in production environments. Orchestrate end-to-end delivery with CI/CD and observability while promoting responsible autonomy among teams aligned with product and operational objectives. Implement on-premises, hybrid, and cloud solutions with security best practices, observability, and integration with existing systems. Lead architectural decisions in backend and frontend (Java/Spring Boot, Python/FastAPI, React/Angular), ensuring scalability, consistent testing and code reviews. Implement and maintain end-to-end CI/CD pipelines and observability (logs, metrics, distributed tracing). Coordinate enterprise integrations (ServiceNow, Jira, CRMs) and iPaaS (e.g., Boomi), including mapping, validation, and compliance. Apply practices such as DDD, clean architecture, application security, and secrets/IAM management throughout the development lifecycle. Provide technical guidance to the team, elevate quality standards, and align practices with product and operations. Lead L2/L3 support in production: incident triage and resolution, prevention escalation (on call), SLA management, and conducting post-mortems focused on root causes and corrective actions. Operate and evolve applications in on-premises, hybrid, or cloud environments: VMs, networks, VPNs, certificates, Nginx/reverse proxy, load balancing, and enhancing the security of exposed services. Key Requirements Proven ability to define technical standards, architecture, and development practices. Experience with CI/CD orchestration and observability practices. Knowledge of implementing on-premises, hybrid, and cloud solutions with security best practices. Leadership in architectural decisions for backend and frontend technologies. Experience with maintaining CI/CD pipelines and end-to-end observability. Ability to coordinate enterprise integrations and ensure compliance. Mastery of practices such as DDD and clean architecture. Technical expertise in Java/Spring Boot, Python/FastAPI, React/Angular. Experience in providing L2/L3 technical support and leading incident resolution. Expertise in security practices, including Spring Security and OAuth. Nice to Have Experience with Docker, Kubernetes, and cloud environments (Azure/AWS/GCP). Background in data management with PostgreSQL, MongoDB, and Redis. Familiarity with AI models, particularly RAG. Knowledge in security access management and policies based on the principle of least privilege.

🏢 Summary: Senior Software Engineer role focused on designing, building, and scaling secure enterprise web applications and high-performance SaaS platforms. The position covers backend APIs, microservices, testing, technical leadership, and Azure-based CI/CD delivery within Agile teams. 🗂️ Requirements: 6+ years of full-lifecycle software development experience, Experience developing and maintaining large-scale web applications and SaaS solutions, Strong proficiency in C#, .NET Core, and .NET Framework, Hands-on experience with Azure Cloud services, RESTful architectures, and CI/CD pipelines, Experience with NUnit, Moq, Jest, and Git, Strong problem-solving and technical communication skills 📃 Skills: C#, .NET, Azure, REST, Microservices, NUnit, Moq, Jest, Git, CI/CD, SaaS 🏢 Description: We are looking for a skilled and passionate Senior Software Engineer to join the core engineering team. In this role, you will play a key part in designing, building, and scaling enterprise-grade web applications and high-performance SaaS solutions. If you have a strong foundation in Microsoft technologies, cloud architecture, and modern engineering practices—and love solving complex technical challenges—we would love to hear from you! Key Responsibilities Architecture & Development - Design, build, and maintain scalable, secure, and resilient web applications and SaaS platforms. API & Backend Systems - Implement and optimize RESTful APIs, microservices, and Web API integrations. Quality & Testing - Drive software quality by writing comprehensive unit tests using NUnit, Moq, and Jest, and advocate for test-driven practices. Technical Leadership - Participate in code reviews, architectural discussions, and technical planning to ensure clean, maintainable code. Agile Collaboration - Work closely with cross-functional teams using Agile methodologies to deliver features iteratively and efficiently. DevOps & Version Control - Utilize Git and Azure DevOps for continuous integration, project tracking, and modern deployment pipelines. Key Requirements Experience - 6+ years of hands-on experience in full-lifecycle software development. SaaS & Web Architecture - Proven track record of developing and maintaining large-scale web applications and SaaS solutions. Core Tech Stack - Strong proficiency in C#, .NET Core, and .NET Framework. Cloud & DevOps - Hands-on experience with Azure Cloud services, RESTful architectures, and CI/CD pipeline concepts. Testing & Tools - Solid experience with unit testing frameworks: NUnit, Moq, and Jest; and version control with Git. Communication - Excellent problem-solving skills and the ability to articulate technical concepts clearly to team members. Nice to Have Agile Frameworks - Experience working within a SAFe (Scaled Agile Framework) environment. Mentorship - Passion for coaching junior developers and fostering team growth.

🏢 Summary: Senior System Integration & Test Engineer role focused on defining and executing integration and validation strategies for complex software systems. The position involves building integration environments, implementing CI/CD practices, and ensuring full requirements traceability and high-quality deliverables. The project duration is 3 years with responsibility for end-to-end integration and testing activities. 🗂️ Requirements: Master’s degree in Computer Science or equivalent, Minimum 7 years of experience in software integration and qualification, Strong knowledge of software project lifecycle management, Advanced experience with application servers, Expertise in web services integration, Proficiency in CI/CD tools, Strong Linux knowledge, Knowledge of cybersecurity principles (PKI) 📃 Skills: JBoss, Tomcat, SOAP, REST, RPC, Jenkins, Ansible, Linux, PKI, CICD, DevOps 🏢 Description: Introduction & Summary: We are seeking a highly skilled Senior System Integration & Test Engineer with a solid minimum of 7 years in the integration and qualification of software. The ideal candidate will possess a comprehensive understanding of the software project lifecycle, advanced knowledge of DevOps practices, and expertise in integrating systems to ensure high-quality deliverables. Project duration : 3 years. Main Responsibilities: This role involves defining integration strategies and ensuring proper testing of software systems. Key responsibilities include: Defining integration and test strategies, test plans, and test scenarios. Ensuring requirements traceability and coverage. Utilizing DevOps and CI/CD best practices. Building integration environments and installing or upgrading solutions. Performing integration and validation tests (including load, performance, high availability, accuracy and security tests). Investigating issues by analyzing logs during tests execution, reports incidents through configuration management tool and monitors them until closure. Producing documents that will allow proper installation, testing, operations and administration. Preparing and providing training for customers, support and maintenance teams. Supporting pre-sales teams on specific technical requests on integration activities. Defining and implementing autonomously the entire integration and test strategy of a full simple project requiring advanced knowledge in OS, database and integration tools. Key Requirements: - Master's or equivalent degree in Computer Science (5+ years). - Minimum 7 years experience in software integration and qualification. - Proficient in software project lifecycle management. - Advanced skills in Application Servers (JBoss, Tomcat). - Expertise in web services (SOAP, REST, RPC). - Proficient in CI/CD tools (Jenkins, Ansible) and OS (Linux). - Knowledge of Cybersecurity principles (PKI) is important. - Professional English proficiency is essential. Nice to Have: - Familiarity with Maven Artifact repositories (Nexus). - Experience with scripting (Python, Bash, etc.). - Understanding of Queueing services (Rabbit MQ, Active MQ). - Familiarity with cloud environments (AWS, Azure, Google Cloud). - Knowledge of IT infrastructures (Windows, Linux, virtualization). - Experience with test tools (Jira, JMeter, etc.). Other Details: Work Arrangement & Mobility Requirements This position follows a hybrid work model , with 2 days remote and 3 days on-site per week. The selected candidate must also be available for occasional business travel within Europe . Eligibility & Export Control Due to Export Control regulations , the role is restricted to European nationals . Candidates must be eligible to work under these regulations and must not have a criminal record

🏢 Summary: Senior Software Engineer role focused on designing and delivering scalable solutions within complex distributed systems at significant scale. The position requires strong ownership, architectural decision-making, and collaboration across cross-functional teams. The engineer will drive high-impact technical initiatives in a large, distributed environment. 🗂️ Requirements: Degree in Computer Science or equivalent practical experience, Proven experience delivering complex, large-scale software solutions, Hands-on experience with distributed systems, Ability to make independent architectural decisions, Strong collaboration and communication skills, Ability to operate autonomously with high ownership 📃 Skills: DistributedSystems, Architecture, Scalability, Reliability, Observability, SoftwareEngineering, ComputerScience 🏢 Description: Senior Software Engineer About the Role We are looking for a Senior Software Engineer to join a high-scale product environment operating within complex distributed systems. This role is designed for a highly autonomous individual contributor who can take ownership of complex technical initiatives, influence architectural direction, and deliver scalable, reliable solutions in a large organizational setting. You will collaborate cross-functionally with engineering, product, and design teams while contributing to systems used at significant scale. Key Responsibilities Design and deliver high-complexity system components and features Make informed architectural decisions and evaluate technical trade-offs Ensure quality, scalability, reliability, and observability of delivered solutions Identify and manage technical risks, dependencies, and technical debt Develop deep understanding of the product domain and user impact Collaborate effectively across teams in a distributed engineering environment Operate with high autonomy and ownership Contribute to or elevate engineering standards within the team Mentor or support less experienced engineers when needed Requirements Education Degree in Computer Science, Software Engineering, or equivalent practical experience Experience & Competencies Proven experience as a Senior Software Engineer delivering complex, large-scale solutions Hands-on experience working with distributed systems Strong communication and collaboration skills Ability to independently drive architectural decisions Strong sense of ownership over delivered solutions Nice to Have Experience shaping or improving team-level engineering standards Experience collaborating across multiple teams in complex organizational structures

🏢 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 Software Engineer role focused on migrating a legacy system to Microsoft Azure and developing enterprise-grade solutions using Angular and .NET in a global, large-scale environment. The position involves full-stack development, Azure cloud services, and building high-performance, secure, and scalable systems. The project is long-term, fully remote, and based on Scrum methodology. 🗂️ Requirements: Full-stack development experience in large-scale enterprise systems, Strong experience with .NET Core and .NET Framework, Front-end development experience with Angular or Razor, Hands-on experience with Azure services (Function Apps, Logic Apps, Event Grid, Service Bus), Experience with Service-Oriented Architecture (SOA), Knowledge of Design Patterns, SOLID principles, and Domain-Driven Design, Experience with event-driven, microservices, and serverless architectures, Experience building high-volume, low-latency REST APIs with ASP.NET Web API, Experience with ORM tools, preferably EF Core 📃 Skills: C#, .NET, .NETCore, Angular, Razor, Azure, FunctionApps, LogicApps, EventGrid, ServiceBus, ASP.NET, WebAPI, EFCore, SOA, REST, Microservices, Serverless, SQL, NoSQL 🏢 Description: As the Senior Software Engineer, You will be responsible for migrating a legacy system to the Microsoft Azure hosting as well as developing and supporting essential business systems serving a global audience. Project Information: Start : 2 weeks / 30 days of notice period Location : 100% remote Length of the project : first contract for 6 months, but the project is estimated to be at least 2 years long Workload : 37,5 h / week Responsibilities: Deliver enterprise-strength solutions for the Azure platform using Angular and .NET. Participate in Scrum ceremonies, elaboration, and refinement sessions. Provide functionally correct, unit-tested, deployable, and performant software artifacts. Collaborate with Developers, Architects, QAs, and Product Owners. Ensure software meets non-functional requirements, especially for Security, Maintainability, and Performance. Produce technical documentation (e.g. Wikis) as required during the Software Development Life Cycle (SDLC). Assist with code quality monitoring, reporting, and assurance across IB projects. Review/create user stories and acceptance criteria where applicable, supporting peer reviews for quality assurance. Support software releases and deploy code into the production environment. Perform demonstrations for stakeholders distributed globally. Facilitate handovers, support, and training of the application support team for new deliverables. Key Requirements: Full Stack Development experience within large-scale enterprise solutions. Extensive experience in .NET Core and .NET Framework. Comfortable with front-end development using Angular, Razor, or equivalent. Experience with Azure Development (Function apps, Logic apps, Event grid, Service bus). Commercial experience with Service-Oriented Architectures (SOA). Knowledge of Design Patterns, SOLID principles, and Domain Driven Design (DDD). Affinity for event-driven, microservices, and serverless architectures. Portfolio of high-volume, low-latency REST Services built on ASP.NET Web API. Proficiency with one or more ORMs, preferably EF Core. Nice to Have: Experience with polyglot persistence (NoSQL), Azure Storage Services, Azure Data Factory (ADF), and Power BI.

🏢 Summary: The role focuses on building and evolving core platform services to support engineering teams, emphasizing scalable cloud-native solutions, developer experience, and automation. It involves designing shared services, advancing CI/CD and Infrastructure as Code practices, and integrating AI-powered tools and LLM-based solutions. The position also promotes DevOps and SRE standards to ensure reliability and operational excellence in production environments. 🗂️ Requirements: 8+ years of experience delivering production-grade software solutions, Strong proficiency in Python, Experience with Kubernetes and containerized environments, Experience with distributed systems, Knowledge of REST and gRPC service development, Experience with cloud-native architectures, Hands-on experience with Infrastructure as Code tools, Familiarity with AI tooling and LLM-based applications, Ability to support production systems and incident response 📃 Skills: Python, Kubernetes, Docker, REST, gRPC, Terraform, CI/CD, LLM, AI, DevOps, SRE, Cloud, Automation 🏢 Description: We are looking for a Senior Platform Engineer to help build and evolve the core technology platforms that support our engineering organization. This role focuses on developing scalable software solutions, improving developer experience, and driving cloud-native engineering practices across the business. Working closely with engineering, cloud, and operations teams, you will contribute to platform architecture, automation initiatives, and the adoption of modern development and reliability practices. Key Responsibilities • Design and maintain shared platform services and engineering tools used across multiple teams. • Develop and enhance internal platforms, including authentication, developer tooling, and infrastructure services. • Build AI-powered solutions leveraging LLMs, intelligent agents, and automation technologies. • Contribute to engineering standards, architectural guidelines, and reusable frameworks. • Improve software delivery through CI/CD, automation, and Infrastructure as Code. • Promote DevOps and SRE practices, including observability, monitoring, and operational excellence. • Support production systems through incident response and reliability improvements. Required Qualifications • 8+ years of experience delivering software solutions in production environments. • Strong programming skills in Python; experience in other languages like Java, C#, C++, Go or others, nice to have • Experience with Kubernetes, containers, and distributed systems. • Knowledge of REST and gRPC service development. • Experience with solution architecture and cloud-native technologies. • Familiarity with AI tooling, agent-based frameworks, and LLM-powered applications. • Hands-on experience with Infrastructure as Code tools such as Terraform. • Strong communication and technical documentation skills.

🏢 Summary: Senior Software Engineer role focused on designing and developing scalable backend and fullstack applications using modern C++ in Linux environments. The position involves performance optimization, concurrency, and cloud-native technologies while contributing to high-impact product features. It requires strong ownership, collaboration, and the ability to work across diverse technologies including cloud and DevOps tools. 🗂️ Requirements: 6+ years of C++ development experience, Strong knowledge of multithreading, Strong knowledge of memory management, Experience with performance optimization, Experience developing backend systems, Experience with REST APIs, Experience working in Linux environments, Ability to design and maintain scalable systems, Bachelor’s degree in STEM field 📃 Skills: C++, Linux, REST, Multithreading, AWS, Python, Go, Terraform, CloudFormation, GitHub, Jenkins, Artifactory, Ansible 🏢 Description: Senior Software Engineer – C++ We are looking for a talented Senior Software Engineer to join our team. This role is ideal for someone with deep experience in C++ development , backend skills, and exposure to cloud-native technologies. You will work on challenging projects, contribute to high-impact features, and help shape the future of our products. What You’ll Do Design, develop, and maintain scalable backend systems in C++ (modern C++ preferred) Work on fullstack applications , including REST API-based backend services Optimize software for performance, concurrency, and memory efficiency Develop and maintain applications in Linux environments Take ownership of technical tasks, delivering high-quality results independently Collaborate closely with cross-functional teams, contributing to design and technical discussions Explore new technologies and expand beyond your primary stack, including Python, Go, and AWS Apply a product-focused mindset, understanding the business impact of your technical decisions What We’re Looking For 6+ years of hands-on experience in C++ development Solid understanding of multithreading, memory management, and performance optimization Strong experience contributing to complex features with exposure to diverse technologies Proven ability to work effectively in a team and communicate clearly Experience with Linux-based systems and development in Linux environments Self-motivated, independent, and capable of delivering results with limited supervision Bachelor’s degree in Science, Technology, Engineering, or a related field Nice to Have Experience with Go and/or Python Knowledge of cloud-native development and Infrastructure-as-Code tools (Terraform, CloudFormation) Background in enterprise-scale applications or AWS serverless architectures Familiarity with networking protocols, security best practices, and database systems Experience with modern CI/CD pipelines (GitHub, Jenkins, Artifactory, Ansible)

🏢 Summary: Senior Software Engineer role focused on building and scaling a high-performance, AI-supported trade management platform using Rust and C#. The position involves designing distributed, event-driven systems with strong emphasis on performance, scalability, and reliability. The engineer will own solutions end-to-end and optimize cloud-based backend systems. 🗂️ Requirements: 5+ years of software engineering experience, Strong system design knowledge, Strong understanding of concurrency, Strong understanding of performance optimization, Hands-on Rust experience in production, Familiarity with C#/.NET, Experience with distributed systems, Experience with cloud platforms (preferably AWS), Practical use of AI tools in development workflows 📃 Skills: Rust, C#, NET, AWS, Kafka, RabbitMQ, AI, DistributedSystems, Concurrency, PerformanceOptimization 🏢 Description: Senior Software Engineer C# (AI-driven systems) We are looking for an experienced Software Engineer who combines strong system design skills with a modern, AI-supported development approach. This role focuses on building and scaling a high-performance trade management platform, primarily in Rust, with some exposure to C#/.NET. You will work on distributed, event-driven systems processing large volumes of data, with a strong focus on performance, scalability, and reliability. Key Responsibilities Develop and optimize high-performance backend systems Design and maintain scalable distributed services Use AI tools to accelerate development, testing, and debugging Own solutions end-to-end, from design to production Improve system performance and cloud efficiency Requirements 5+ years of experience in software engineering Strong fundamentals in system design, concurrency, and performance Hands-on experience with Rust (production level) Familiarity with C#/.NET Experience with distributed systems and cloud (preferably AWS) Practical use of AI tools in development workflows Nice to have Experience with messaging systems (Kafka, RabbitMQ, etc.) Exposure to financial systems or trading environments