Jobs C# / .NET

Creatio is an AI CRM and workflow platform where people and AI agents work together - with no limits on users, agents, or scale. We help midsize and large organizations run customer workflows in the AI era. With a global team and a large ecosystem of partners, Creatio serves thousands of customers in over 100 countries and automates tens of millions of workflows daily. Genuine care for our clients and partners is at the heart of our DNA.

We’re proud to be recognized by top industry analysts as a Leader and Strong Performer in multiple Gartner and Forrester reports.

In 2025, Creatio was named to Inc.’s Best Workplaces list, recognizing our commitment to employee wellbeing and a strong workplace culture.

Who We’re Looking For

We are looking for an AI Software Engineer to design, build, evaluate, and operate AI-powered capabilities within the Creatio platform.

You will join the AI teams building the agent platform that enables AI agents to safely perform real work in the product: call tools and APIs, read and write data, maintain context, follow permissions, and escalate to humans when needed.

The team also owns the core infrastructure for testing, monitoring, logging, observability, and cost/performance control, ensuring AI agents are reliable, scalable, secure, and production-ready.

This role combines strong software engineering expertise with hands-on AI engineering experience. You will work on enterprise-grade AI solutions, including assistants, copilots, knowledge systems, semantic search, RAG-based capabilities, and agentic workflows.

Responsibilities:

• Design and implement AI-powered product features within the Creatio platform.
• Build assistants, copilots, agentic workflows, knowledge systems, RAG, and semantic search capabilities.
• Integrate LLM providers, tools, enterprise data sources, and MCP-based solutions.
• Develop and maintain backend services using C# and .NET.
• Build evaluation frameworks, quality gates, and observability practices for AI solutions.
• Monitor and improve the quality, latency, cost, reliability, and security of AI capabilities.
• Apply AI coding assistants and engineering agents as part of the daily development workflow.

Requirements:

• Strong experience with C# and .NET.
• Hands-on experience with LLMs, prompt engineering, function calling, and structured outputs.
• Understanding of agent architectures, MCP, RAG, embeddings, vector search, and semantic search.
• Experience with AI evaluation, observability, security, and Responsible AI practices.
• Solid understanding of API design, distributed systems, and software architecture.
• Experience with SQL databases, testing, CI/CD, and cloud-native development.
• DevOps fundamentals, including Docker containerization and basic Kubernetes knowledge.
• Strong knowledge of engineering best practices and production-grade software development.

What to expect from us:

• Growth & Development: Clear career paths, mentorship opportunities, and access to continuous learning to help you reach your full potential.
• Flexibility & Well-Being: We provide flexible work arrangements and initiatives that empower you to manage your schedule effectively, stay productive, and thrive both personally and professionally.
• Recognition & Impact: A culture that celebrates achievements, values your ideas, and empowers you to make real contributions from day one.
• Innovative Culture: Be part of a company that embraces new ideas, modern technologies, and bold thinking to stay ahead of the curve.
• Benefits & Rewards Package: We provide competitive compensation and benefits designed to support you and your family. Our rewards approach goes beyond salary, recognizing your contributions and commitment. The exact package may vary depending on your country of residence and employment type.

Overview 

We are supporting a digital asset infrastructure company whose platform uses cryptographic security and multi-party computation (MPC) to protect and sign digital-asset transactions.

The company is looking for a Senior Backend C#/.NET Engineer to replace a business-critical Excel/VBA spares booking tool with a maintainable application. The engineer must be capable of shaping partially documented requirements, building the application and integrating it with existing stock and ERP processes.

Practical experience using AI coding tools or agents is required, alongside strong independent engineering judgement, testing and verification.

About the Project
Four Excel/VBA workbooks currently support three operational workflows:
1. Spares booking.
2. Substrate stock counting.
3. Label generation.

Spares booking is the first delivery priority. The current workflow records stock withdrawals in Excel for subsequent ERP updates.

The replacement application will:
— Retrieve stock information through an agreed Microsoft Dynamics NAV integration.
— Record booking transactions promptly in a designated SQL table when an operator books stock out.
— Use the client’s existing posting mechanism for subsequent ERP processing.
— Integrate enterprise single sign-on.
— Support existing 2D barcode scanners, subject to confirming device compatibility and input behaviour.

A desktop application is preferred. The .NET version, desktop framework, stock-read interface and detailed integration contract remain to be agreed.

The initial rollout will cover two UK sites. There is interest in wider international use, but the scope and timing of this remain unconfirmed.

Stock counting and label generation will be assessed next to determine whether each should be repaired, retained or replaced. Completion of all workflows within the initial four-month engagement is not guaranteed.
 

Must-Have Experience and Skills
Technical:
— Strong commercial C#/.NET development experience.
— Experience delivering maintainable desktop applications in C#/.NET.
— Strong SQL capability, including reliable transaction writes.
— Integration with ERP or comparable transactional business systems.
— Ability to read and understand Excel formulas and VBA.
— Enterprise single sign-on integration.
— Practical experience configuring and directing AI coding tools or agents.
— Independent review, debugging and testing of generated code.
— Understanding of data validation, concurrent operations, failed transactions and duplicate submissions.
— Ability to make pragmatic architectural decisions where requirements are

incomplete.

Business and Delivery
— Clear technical English.
— Effective remote working and stakeholder collaboration.
— Ability to work directly with operational users to validate business processes.
— Comfortable owning delivery with limited day-to-day direction.
— Clear communication of dependencies, risks, trade-offs and progress.

Desirable Experience
— Microsoft Dynamics NAV.
— Barcode scanner integration, particularly 2D scanners.
— Stock, inventory, warehouse or manufacturing applications.
— Replacing Excel/VBA tools with supported business applications.
— Delivering software through QA, user acceptance testing and operational

handover.
— No mandatory sector/market experience is required.

Responsibilities 
— Analyse the existing workbooks, formulas, VBA and supporting processes.
— Validate intended behaviour with the applications team and operational users.
— Identify defects and obsolete workarounds that should not be carried into the

replacement.
— Agree a prioritised backlog and realistic delivery increments.
— Design and build the C# application using an approved AI-assisted development

workflow.
— Own generated-code review, engineering decisions and testing.
— Implement stock retrieval and booking transaction writes through the agreed

integration.
— Integrate single sign-on and confirm barcode scanner compatibility.
— Agree permissions, transaction history and safeguards during design.
— Support client QA and business user acceptance testing.
— Provide the tested application, deployment instructions and maintenance

documentation.
— Assess the remaining workflows and recommend proportionate next steps.
— Escalate dependencies and scope constraints early.

Team and Client Support
The engineer will work closely with a dedicated member of the client’s applications team, who will:

— Act as the primary link between the developer and business users.

— Own requirements and prioritisation with the business.
— Support SQL integration.
— Perform QA testing.

Business users will undertake UAT. Completion will be signed off by the client’s nominated IT stakeholders. The client owns hosting, identity/access, backups, production deployment and ongoing support. The engineer is responsible for preparing the application and supporting testing and handover
 

Assessment Process
1. CV Review
2. Screening Call (30 mins) – Technical screening to understand experience 
3. Technical assessment/challenge. (1 hr)
4. Final Interview (30 mins) – Cultural fit, collaboration instincts, MVP mindset 

We are looking for an experienced Senior .NET Developer to join our engineering team and help build a modern FinTech platform. You'll play a key role in designing scalable solutions, driving technical decisions, and mentoring other developers.

Responsibilities:

- Design, develop, and maintain scalable backend applications.

- Build and optimize high-performance APIs and services.

- Contribute to system architecture and technical strategy.

- Conduct code reviews and mentor team members.

- Collaborate with Product, QA, and DevOps teams.

- Ensure high code quality and system reliability.

Requirements:

- 5+ years of commercial experience with C#/.NET.

- Strong expertise in .NET Core / .NET 8 and ASP.NET Core.

- Extensive experience designing REST APIs.

- Strong knowledge of SQL and database optimization.

- Experience with Entity Framework Core.

- Solid understanding of microservice architecture.

- Hands-on experience with Docker and Kubernetes.

- Experience with Azure or AWS.

- Deep understanding of OOP, SOLID, and design patterns.

- Upper-Intermediate English or higher.

Nice to Have:

- Experience with message brokers (RabbitMQ, Kafka, Azure Service Bus).

- Experience with Redis.

- Background in FinTech, banking, or payment systems.

- Experience mentoring developers and leading technical initiatives.

Deep backend expertise is required.

Core Tech Stack & Architecture

• Primary Language / Backend (90%): C# / .NET Core (Senior level)
• Architecture: Headless architecture, Microservices
• Orchestration & Cloud: Kubernetes, Cloud environments
• Frontend: Vue.js (minor client-side component)

Key Backend & Engineering Requirements

• Security: Building and securing systems handling sensitive and enterprise data.
• System Design & Optimization: High performance, scalability, and efficiency.
• Concurrent Programming: Parallel/concurrent processing.
• Memory Management: Low-level resource and proper memory management.

AI & LLM Integration Requirements

• Platforms & Tools: Amazon Bedrock, diverse AI/LLM models.
• API & Integration: Model APIs, reading documentation, and integrating new AI models.
• Operations & Cost Management: Prompts, tokens, token usage tracking, and cost optimization.
• Model Selection: Evaluating and selecting appropriate AI models based on task requirements.
• Mindset: Strong capacity and enthusiasm to learn new AI areas rapidly (deep AI expertise is secondary to strong C#/.NET foundations).

.NET Full-Stack Engineer & Microsoft Teams Audio & Communications

We’re looking for an experienced .NET Full-Stack Engineer to join a long-term product development team working on communication functionality within the Microsoft Teams ecosystem.
 

This is not a short-term integration project. You’ll be joining a stable, long-term product where Microsoft Teams communication, audio, meetings, and related data are core parts of the platform.

The role is primarily backend-focused, but you’ll also contribute to frontend functionality when needed.

What you’ll be working on

You’ll develop and maintain functionality around Microsoft Teams voice and communication workflows, including:

• Teams calls and online meetings
• Audio and communication data
• Meeting participants and call-related metadata
• Recordings and communication events
• Microsoft Graph and Graph Communications integrations
• Backend services responsible for collecting, processing, and exposing communication data
• Real-time functionality and integrations with other product components
• Supporting frontend features in React 
   

Core technologies

• C# / .NET / ASP.NET Core
• Microsoft Graph API
• Microsoft Graph Communications / Cloud Communications APIs
• Microsoft Teams APIs
• Azure
• SQL
• REST APIs
• SignalR / WebSockets
• React
   

What we’re looking for

• 5+ years of commercial C#/.NET experience
• Strong backend development experience with ASP.NET Core
• Commercial experience with Microsoft Graph
• Experience with Microsoft Teams communication APIs
• Practical experience working with Teams audio, calls, meetings, recordings, participants, or call data
• Microsoft Graph Communications / Cloud Communications APIs is a must!
• Solid SQL knowledge
• Ability to work independently with integrations and production functionality
• English B2+
   

You’ll get:

• A stable product with a long-term roadmap
• Direct cooperation with a US-based client
• Predictable, long-term workload
• Transparent compensation
• Paid vacation and sick leave
• Professional development support
• High-quality equipment
• Paid office lunches
• Anniversary gifts and baby bonus
   

Full-time · Long-term cooperation · Remote/Hybrid

Sii Ukraine is a subsidiary of Sii Poland — the leader in IT, engineering, and consultancy services with over 7500 IT experts in Poland and more than 250 prestigious customers. We are looking for ambitious and top-quality professionals to join our project teams.

Join a product-focused engineering team developing and enhancing an advanced desktop application that combines software engineering, computer vision, image processing, and AI technologies. You will take ownership of a mature solution built with C#/.NET and WPF, contributing to its ongoing evolution, cloud integrations, and AI-powered image analysis capabilities.

Your responsibilities:

• Develop, maintain, and enhance a desktop application built with C#, WPF, and .NET.
• Work with the MVVM architecture and contribute to application stability, performance, and user experience.
• Integrate and support REST APIs, authentication workflows, file uploads, and communication with cloud services.
• Maintain and improve computer vision and image processing functionality.
• Integrate, deploy, and optimize AI models used within the application.
• Troubleshoot issues across application, integration, and AI-processing layers.
• Contribute to testing, release management, documentation, and development best practices.
• Collaborate on the integration of C++ components and third-party libraries where required.

What we're looking for:

• Strong commercial experience with C# and the .NET ecosystem.
• Hands-on experience developing desktop applications using WPF.
• Solid understanding of the MVVM pattern.
• Experience working with REST APIs and client-server integrations.
• Good knowledge of web technologies, HTTP, authentication, and API communication.
• Computer vision, image processing, or image analysis experience.
• Ability to understand, maintain, and extend an existing codebase independently.
• Experience with debugging, testing, source control, and software delivery processes.

Nice to have:

• AI/ML model integration and deployment.
• OpenCV, TensorFlow, ONNX Runtime, or similar technologies.
• C++ development and native library integration.
• CI/CD pipelines, automated releases, and application packaging.
• Backend or web application development experience.

We’re looking for an advanced Middle or Senior .Net engineer for a huge legacy project in the Healthcare domain. You will have the chance to solve complex problems with global impact. Here’s what we’re looking for in our ideal candidate and what you can expect from the role.

What We Need from You:

• Seasoned Expertise: Over 5 years of hands-on experience with .NET, Entity Framework, AWS, and cloud tech.
• C# Proficiency: High skill in C# and .NET platforms, including both .NET Framework 4 and .NET 8.
• Back-End Strength: Experience with ASP.NET (MVC), Windows Services, and RDBMS, especially MS SQL Server.
• Best Practices Advocate: Clean Architecture, SOLID principles, design patterns, and unit testing are second nature to you.
• Team Player: Collaboration is your middle name. You excel in working alongside Project Managers and are all about team success.
• Communication Skills: Your English proficiency is at least pre-intermediate, for creating and understanding the documentation, tasks, interfaces, chats, etc.
• Familiar with Front-End: While your focus is back-end, you’re no stranger to Vue or other front-end frameworks, along with HTML, CSS, and jQuery.

Nice-to-Haves:

• Experience with Crystal Reports or similar enterprise-level tools is a big plus.

Your Role and Responsibilities:

• Architect of Solutions: Design, develop, and maintain robust, scalable, and secure applications using .NET technologies.
• Code Master: Write clean, efficient, and maintainable code following best practices, conduct code reviews, and implement unit tests.
• Problem Solver: Troubleshoot and resolve complex technical issues, ensuring the stability and performance of our applications.

Working Hours & Availability:

• Full Remote: The team is scattered worldwide, so we all work comfortably from home.
• Flexibility: It’s not necessary to check in every morning. The main thing is that you are available at about the same time as the team and turn up for scheduled meetings. And, of course, meet deadlines and get the job done right.😉

The candidate evaluation process consists of two stages — two interviews: a general interview and a purely technical interview with the project PM.

Who are we:

Join Code Harbor — we are a team of dedicated IT professionals specializing in web development, CRM system construction, and startup support for our partners from the USA, Canada, or Europe.

We are committed to providing competitive and well-supported solutions to meet the needs of our clients by delivering not a bare service, but a problem-resolving development.

About the project:

Our client’s project unites over 90 medical clinics across the US states of Maryland, Northern Virginia, and Washington D.C., employing more than 1000 individuals and contractors.

To successfully manage multiple clinics and to provide consistently high-quality service, our client has developed a novel business model and implemented modern technology for the internal and external flow of information.

The core of the company, excluding employees, is the Intranet Portal. It connects all clinics and headquarters and includes schedules, appointment information, patients' info, an attorney portal, and much more. External IT provides instant access to clients' essential information and electronic transfer of medical records to the participating attorney.

What we offer:

• Full-time job
• Work-from-home opportunity
• Reasonable salary
• 18 days of annual vacation
• 5 days of paid sick leaves
• A productive work environment with growth and development opportunities as an experienced specialist

If you’re excited by the prospect of shaping the future of technology and making a significant impact, we’d love to welcome you aboard. Let’s create something amazing together!

We’re looking for an advanced Middle or Senior .Net engineer for a huge legacy project in the Healthcare domain. You will have the chance to solve complex problems with global impact. Here’s what we’re looking for in our ideal candidate and what you can expect from the role.

What We Need from You:

• Seasoned Expertise: Over 5 years of hands-on experience with .NET, Entity Framework, AWS, and cloud tech.
• C# Proficiency: High skill in C# and .NET platforms, including both .NET Framework 4 and .NET 8.
• Back-End Strength: Experience with ASP.NET (MVC), Windows Services, and RDBMS, especially MS SQL Server.
• Best Practices Advocate: Clean Architecture, SOLID principles, design patterns, and unit testing are second nature to you.
• Team Player: Collaboration is your middle name. You excel in working alongside Project Managers and are all about team success.
• Communication Skills: Your English proficiency is at least pre-intermediate, for creating and understanding the documentation, tasks, interfaces, chats, etc.
• Familiar with Front-End: While your focus is back-end, you’re no stranger to Vue or other front-end frameworks, along with HTML, CSS, and jQuery.

Nice-to-Haves:

• Experience with Crystal Reports or similar enterprise-level tools is a big plus.

Your Role and Responsibilities:

• Architect of Solutions: Design, develop, and maintain robust, scalable, and secure applications using .NET technologies.
• Code Master: Write clean, efficient, and maintainable code following best practices, conduct code reviews, and implement unit tests.
• Problem Solver: Troubleshoot and resolve complex technical issues, ensuring the stability and performance of our applications.

Working Hours & Availability:

• Full Remote: The team is scattered worldwide, so we all work comfortably from home.
• Flexibility: It’s not necessary to check in every morning. The main thing is that you are available at about the same time as the team and turn up for scheduled meetings. And, of course, meet deadlines and get the job done right.😉

The candidate evaluation process consists of two stages — two interviews: a general interview and a purely technical interview with the project PM.

Who are we:

Join Code Harbor — we are a team of dedicated IT professionals specializing in web development, CRM system construction, and startup support for our partners from the USA, Canada, or Europe.

We are committed to providing competitive and well-supported solutions to meet the needs of our clients by delivering not a bare service, but a problem-resolving development.

About the project:

Our client’s project unites over 90 medical clinics across the US states of Maryland, Northern Virginia, and Washington D.C., employing more than 1000 individuals and contractors.

To successfully manage multiple clinics and to provide consistently high-quality service, our client has developed a novel business model and implemented modern technology for the internal and external flow of information.

The core of the company, excluding employees, is the Intranet Portal. It connects all clinics and headquarters and includes schedules, appointment information, patients' info, an attorney portal, and much more. External IT provides instant access to clients' essential information and electronic transfer of medical records to the participating attorney.

What we offer:

• Full-time job
• Work-from-home opportunity
• Reasonable salary
• 18 days of annual vacation
• 5 days of paid sick leaves
• A productive work environment with growth and development opportunities as an experienced specialist

If you’re excited by the prospect of shaping the future of technology and making a significant impact, we’d love to welcome you aboard. Let’s create something amazing together!

Inception-1 is a product company that creates AI-driven B2C products designed to help people feel more connected and less alone. Our mission is to build meaningful digital experiences that blend technology with empathy and to prove that technology can be both human and transformative.
GetHoney is our AI-driven product, and we’re looking for a Senior Product Engineer with a strong C#/.NET background and commercial frontend experience with React or another modern JavaScript/TypeScript framework.
This is not a feature-delivery role. We’re looking for an engineer who wants to understand the user problem, challenge solutions, make technical and product decisions, ship features end-to-end, and evaluate their impact after release.
You’ll be responsible for solving complex user problems and delivering meaningful product value end-to-end — from understanding the problem and shaping the solution to implementation, deployment, and post-release analysis.

If you want to own product outcomes, not just implementation, and build with an AI-first mindset, we’d love to hear from you!
 
Must-have skills:
 

• Proven ability to own and ship user-facing product features end-to-end — from problem definition and technical decisions to release and post-launch analysis.
• Strong hands-on experience with C#/.NET and building production backend systems.
• Commercial frontend development experience with React or another modern JavaScript/TypeScript framework.
• Experience working in a product company and building software used by real customers.
• Hands-on experience integrating LLMs and AI APIs into production applications.
• Hands-on experience with agentic engineering — designing and using AI-agent workflows, coding agents, and LLM-based automation in real development processes.
• Product development skills:
  • Strong grasp of product analytics;
  • Product features design and testing experience.
• Solid system design fundamentals. 

Key responsibilities for the first 6 months:
 

• Ship 15–20 meaningful product experiments.
• Implement agile but stable solutions for engaging conversational model, voice generation, interactive calls, etc.
• Improve retention and activation metrics.
• Design and maintain an experimentation framework (A/B testing, rapid iteration).
• Work across product, design, and research to turn insights into shipped features.
• Participate in user interviews and discovery sessions.
   

What makes you successful in this role:
 

• You have a strong product mindset and take ownership from idea to impact.
• You’re comfortable working in ambiguity and early-stage environments.
• You have high emotional intelligence and empathy for users.
• You care not only about shipping fast, but about shipping the right thing.
   

What we offer:

• Flexible work schedule and remote-friendly culture.
• Online services of a corporate doctor, and after the probationary period — health insurance in Ukraine.
• 20 working days of paid vacation per year, unlimited sick leave.
• All equipment necessary for work.
• Compensation for the best courses on the market, corporate online meetups and lectures, a large library, business and management schools for employees.

We are looking for Senior .NET developer with some skills in Angular to join our team working with stable , commercially succesful customer with working offline business. 

This is a long term , full time position for the candidates located OUTSIDE OF UKRAINE.

Timezone that candidate must be ready to work in is EST timezone. 

So ONLY candidates who are ready to work FULL TIME working hours WITHIN EST timezone will be considered. 

Must have skills :
- experience with multi-tenant systems and data isolation between tenants
- DDD targeted development mindset
- experience with eventual consistency architecture
- EF Core and SQL Server experience, including strong understanding of relational DB principles and ability to review and optimize raw T-SQL
- ability to design and extend behavior-level test suites, not only isolated unit tests

Nice to have skills:
- experience working in a partially refactored codebase, where legacy and target architecture coexist
- modular monolith experience
- understanding of authentication and authorization in distributed APIs, token handling, secure-by-default endpoints
- experience with background and scheduled processing, idempotency and retries
- Angular basic knowledge — enough to read the client code and understand how contract changes break it
- experience integrating with unstable third-party APIs (rate limits, versioning, partial failures)
- experience in ERP, order management, inventory or CRM projects

Will be an advantage:
- experience with AI agents as a part of workflow is appreciated
- experience with reporting and analytics pipelines (Power BI, aggregated data sync)
- working knowledge of Azure (Functions, Blob/Queue Storage, Key Vault, App Configuration, Application Insights)

Project tech stack:

- .NET (C# 12), ASP.NET Core Web API
- MS SQL Server, EF Core 8, linq2db
- Quartz.NET, Azure Functions, SignalR
- Azure (Blob/Queue Storage, Key Vault, App Configuration, Application Insights)
- xUnit, Moq, FluentAssertions
- Angular
- External: NAGS, QuickBooks, Twilio, Power BI

Job Description

5+ years of experience in software development, with a focus on C#, React, and .NET Core.
Strong knowledge of object-oriented programming, design patterns, and modern software architectures (e.g. serverless, microservices, containerized, etc.).
Proficiency in front-end development using React.js and modern JavaScript/TypeScript frameworks.
Experience with cloud platforms (e.g., Azure, AWS, or GCP). - Azure preferred
Experience with CI/CD pipelines, unit testing, and deployment automation tools.
Excellent problem-solving skills and ability to work in a fast-paced, agile environment.
Experience working with Azure DevOps for task tracking and code repository would be a plus.
Experience working with AI-based productivity tools would be a plus.
Experience with NextJS and Syncfusion UI component library would be a plus.

Job Responsibilities

Perform as part of a team in designing, developing, and deploying high-quality applications using C#, React, and .NET Core working on one of the workstreams on the project in Healthcare domain.

Conduct code reviews and support junior team members to ensure technical excellence and professional growth.

Department/Project Description

Client is a leading global Contract Research Organization (CRO) that provides Phase I-IV clinical trial management, market access, and technology solutions with over 30 years of experience.