Jobs C# / .NET

We are looking for a .NET WPF Engineer to take full technical ownership of a Windows desktop application within a well-established software product.

Our customer is one of the world’s top 10 leading software publishers, and the product competes with well-known global brands.

This is an autonomous role for an engineer who is comfortable taking responsibility for an existing application, making technical decisions, developing new functionality, improving architecture, and maintaining the product’s stability and performance.

You will have significant ownership over the application and will be expected to independently drive development from requirements through implementation and delivery.

Responsibilities

• Take full technical ownership of the assigned Windows desktop application
• Design, develop, maintain, and improve WPF/.NET applications
• Independently analyze requirements and translate them into effective technical solutions
• Make technical decisions related to application architecture and development
• Work with MVVM, Prism, and Dependency Injection
• Develop new features and improve existing functionality
• Take ownership of existing and legacy components, identifying areas for refactoring and improvement
• Integrate the desktop application with backend services and REST APIs
• Investigate and resolve complex technical issues, bugs, and performance problems
• Ensure application stability, performance, and maintainability
• Take responsibility for the technical quality and delivery of your work

Requirements

• 4+ years of commercial software development experience
• Strong hands-on experience with .NET
• Strong expertise in WPF
• Solid understanding and practical experience with MVVM
• Experience working with Prism and Dependency Injection
• Strong knowledge of SOLID, Clean Code, and design patterns
• Good understanding of async/await, multithreading, and concurrency
• Strong debugging and problem-solving skills
• Experience integrating desktop applications with REST APIs and backend services
• Experience working with existing/legacy codebases and improving them
• Ability to work independently and take ownership of technical decisions
• English — B2 or higher

We Offer

• Competitive compensation
• Flexible working hours
• Remote / Office / Hybrid work options
• Technical equipment
• Professional development and Performance Appraisals
• English courses
• Health Insurance
• Online courses
• Corporate events, tech talks, and more

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

N-iX is looking for Lead .Net Engineer to join the team

Position Overview:  

As a .NET Engineer you will drive the technical modernization of a large-scale system from .NET Framework 4.8 to .NET 10. Your work will span the full backend stack — replacing Windows-only dependencies, refactoring legacy patterns, migrating data access to EF Core, and ensuring every service is portable, containerizable, and ready for AWS cloud deployment. You will collaborate closely with DevOps and database engineers as part of a cross-functional Agile team delivering a phased, production-safe migration.

Responsibilities:

• Migrate a .NET Framework 4.8 application to .NET 10.
• Migrate a large database-first Entity Framework 6 model to EF Core 8 across multiple bounded contexts, one domain at a time.
• Identify and replace Windows-only libraries and assembly references that prevent building and running on Linux.
• Establish unit test coverage measurement and enforce quality gates as part of the migration pipeline.
• Collaborate with the DevOps engineer on Dockerfile authoring, environment configuration, and secrets injection.
• Participate in Agile/SCRUM processes, conduct code reviews, and document migration decisions.

Must-Have Qualifications:

• 5+ years of C# and .NET backend development with strong knowledge of ASP.NET and ASP.NET Core.
• Proven, hands-on experience migrating .NET Framework applications to .NET Core / .NET 10 in production.
• Solid experience with Entity Framework Core.
• Solid knowledge of DDD, CQRS, and repository patterns in layered .NET architectures.
• Familiarity with Docker multi-stage builds and Linux container fundamentals for .NET applications.
• Proficient with xUnit and Moq for unit testing; comfortable with container-wired test setups.
• Experience with AWS ECS / Fargate and ECR for deploying containerized .NET applications.
• Familiarity with MassTransit and RabbitMQ or Amazon MQ for event-driven messaging.
• Experience with Hangfire or similar background job processing frameworks.
• Proficient in Git and familiar with Agile/SCRUM team processes.
• Upper-Intermediate/Advanced English level 

Nice-to-Have Skills:

• Experience building CI/CD pipelines for .NET projects.
• Familiarity with micro-frontend architecture and Angular-based single-page applications.
• Experience with automated code coverage tooling and enforcing coverage thresholds in CI.
• Experience with performance optimization and scalable enterprise backend systems.

We offer*:

• Flexible working format - remote, office-based or flexible
• A competitive salary and good compensation package
• Personalized career growth
• Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)
• Active tech communities with regular knowledge sharing
• Education reimbursement
• Memorable anniversary presents
• Corporate events and team buildings
• Other location-specific benefits

*not applicable for freelancers

Creatio Developer

Front System Team

Information Technology Department

The Front System Directorate Team is looking for a colleague for the position of Creatio Developer.

The main mission of this role is to develop critical modules in CRM Creatio and implement integration mechanisms.

What you will do:

• Full-stack development on the Creatio platform:
  • Backend: Business logic in C#, development of web services and event handlers.
  • Frontend: UI configuration (Freedom UI / Classic), client-side logic in JS.
• Implement integrations with banking systems (ABS, MConnect, Asterisk, S3).
• Develop and optimize business processes (BPMN).
• Create printed forms and reports.

• Participate in code reviews and team discussions about architecture.

   

What we are looking for:

• Excellent knowledge of C# .NET (Backend) and JS/TS.
• Commercial experience in C# .NET and T-SQL / PL-SQL development.
• At least 2 years of experience with the Creatio platform.
• Understanding of how REST/SOAP APIs work.

• Ability to understand existing code and work effectively in a team.

   

Will be an advantage:

• Experience in FinTech / banking (understanding the specifics of ABS and security requirements).
• Experience with Kafka and Redis.

• Experience in development with Freedom UI (Angular).

   

Why join us?

• High load and challenges: We are building the front system for the largest bank in the country. This is not about maintaining an old system, but about creating a new architecture from scratch (Kafka, microservices support, Modular Monolith).
• Modern technologies: No legacy, just a modern tech stack. We work with Freedom UI, CI/CD, and Docker.
• Real impact: You will directly influence how one million customers interact with the bank, not just resolve tickets.

What benefits will you have?

• An individual professional development and career advancement plan.
• Performance bonuses based on your results.
• Ongoing training to develop your professional and personal skills.
• Participation in various interest clubs and team-building activities organized by our team.
• Favorable terms on the bank's products for employees.

N-iX is looking for a Tech Lead to join a long-term product development initiative. In this role, you will be involved in the entire software development lifecycle, including architecture design, system development, deployment, and maintenance of both new and existing features. You will play a key role in driving backend development, ensuring system reliability, scalability, and high code quality while mentoring team members and contributing to technical decision-making.
 

Responsibilities:

• Design, develop, maintain, and support business-critical applications using C# and .NET
• Take ownership of backend architecture and technical solutions
• Lead and mentor developers, fostering engineering excellence and best practices
• Participate in system design, code reviews, and technical discussions
• Implement and promote best practices in software development, testing, version control, and CI/CD
• Build and maintain scalable APIs and distributed systems
• Collaborate closely with cross-functional teams to ensure high-quality product delivery
• Identify opportunities for innovation and continuous improvement
   

Requirements:

• 6+ years of experience in Backend Development using C#/.NET technologies
• Strong expertise in modern .NET ecosystem and backend application development
• Solid SQL skills and hands-on experience with PostgreSQL and/or MySQL
• Strong experience designing, building, and consuming APIs, including concepts such as caching, rate limiting, queues, and performance optimization
• Experience with messaging systems and asynchronous communication patterns (RabbitMQ, Kafka, Azure Service Bus, or similar)
• Deep understanding of software design principles, design patterns, and architecture best practices
• Experience with microservices architecture
• Hands-on experience with unit testing and integration testing
• Knowledge of authentication, authorization, and application security best practices
• Experience with structured logging and observability practices
• Experience using Git and GitHub workflows
• Knowledge of MVC architecture
• Understanding of HTTP protocols and web technologies
• Basic knowledge of frontend technologies, including HTML, JavaScript, and CSS
• Strong communication and leadership skills
• Upper-Intermediate or higher level of English, both written and spoken
• Positive attitude, strong ownership mindset, and ability to work effectively within a team
• Active GitHub profile with private repositories available for review
   

Nice to Have:

• Experience with Blazor
• Knowledge of gRPC
• Experience with Angular and reactive programming principles
• Understanding of Scrum/Agile development methodologies
• Experience with Test-Driven Development (TDD)

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.

Position overview
As a Senior .NET Engineer on the Fintech Core project, you will drive the development of key product modules within a modular white-label fintech platform designed for rapid deployment of digital banking and payment solutions. You will take ownership of technical implementation, architectural decisions, integration approaches, and engineering quality within one of the platform’s major client deployments.
 

The role requires deep expertise in backend engineering, distributed systems, and fintech integrations, with strong focus on scalability, reliability, security, and maintainability. You will work closely with Architects, Product Owners, DevOps Engineers, and cross-functional development teams to design and implement high-performance microservice-based solutions that support complex financial operations.
 

This position is ideal for a proactive and technically strong engineer with hands-on experience in fintech or banking systems, who is capable of leading module-level development initiatives, mentoring engineers, and driving engineering excellence across the project.

Your Background

• 6+ years of commercial experience with .NET backend development
• Experience with fintech, banking, or payment systems
• Experience leading engineers as a Technical Lead, Team Lead, or Senior Engineer with ownership responsibilities
• Experience mentoring developers, conducting code reviews, and supporting technical growth
• Strong understanding of microservices architecture and distributed systems
• Experience with ASP.NET Core, REST APIs, and gRPC
• Hands-on experience with Docker and Kubernetes
• Experience with PostgreSQL, Redis, MongoDB, RabbitMQ, and Kafka
• Strong knowledge of software architecture, clean coding principles, and engineering best practices
• Experience participating in architecture discussions and driving technical decisions
• Experience working closely with Product Owners, Architects, and cross-functional teams
• Experience with AWS is a plus
• English level: Upper-Intermediate or higher

Responsibilities

• Lead the development of key backend modules within the Fintech Core platform
  Design, develop, and maintain scalable backend services using .NET and ASP.NET Core
• Design and evolve microservice-based solutions and distributed architectures
• Develop and maintain REST APIs and gRPC integrations
• Drive technical decisions and contribute to the overall system architecture
• Own module delivery from technical design through production release
• Mentor engineers, perform code reviews, and promote engineering best practices
• Support estimation, task decomposition, and technical planning
• Collaborate closely with Product Owners, Architects, QA, DevOps, and other engineering teams
• Ensure system reliability, scalability, performance, and security
• Identify technical risks and proactively propose improvements
• Contribute to continuous improvement of development processes and engineering standards

Technologies

.NET 10, ASP.NET Core, gRPC, Entity Framework Core, PostgreSQL, RabbitMQ, Docker, Kubernetes, OpenTelemetry, Prometheus, Serilog, AWS, GitHub Actions

WE OFFER 
-20 billable days off in the first year of cooperation, all next years — 25 billable days off 
-Fair and competitive compensation 
-Friendly team and enjoyable working environment 
-Clearly described business processes in the company that really work -Regular updates on company news and Q&A sessions with top management 
-Flexible work schedule 
-Remote work mode 
-Ability to transfer unused vacation days to the next year

Payments are the backbone of every successful company. You can have flashy UI, adverts, events, etc. But if your users can not pay you, then it’s all for nothing. Having a smooth payment flow is a must.   Because every additional step, every issue, is a way for the user to stop and think “Do I really need it?”. 

Developing Payments product includes working closely with Finance specialists and business stakeholders and understanding what is needed for the company in your domain - adding new payment methods, improving payment flows, or switching to a new payment processor.

Most often this is not something that can be showcased, but it’s important work that the whole company is based upon.

Your expertise:

At least 7 years of software development experience

At least 2 years of experience in a lead position
Experience with React and TypeScript

Excellent knowledge of C#, .NET, .NET Core

ORM + relational databases experience (preferably Entity Framework + PostgreSQL / MSSQL)

Cloud infrastructure setup experience AWS, Azure, GCP (preferably AWS ECS, RDS, SNS / SQS)

Experience with React and TypeScript

Good experience with Integration / Unit testing

Good experience with ASP.NET Core

Experience developing microservices

Experience with Docker

Understanding of SOLID, OOP, Clean Code, GOF

Excellent communication and organization skills, product-oriented mindset, focus on team results, and leadership qualities

Understanding SDLC

Upper-intermediate or higher level of English

Will definitely be a plus:

• Experience with ElasticSearch
• Experience with Kubernetes
• Experience with Terraform
• Experience with Redis
• Experience with Mobx
• Understanding of CI / CD and experience with Jenkins and Vault
• Experience with creating solution Architecture and solving non-standard CRUD tasks

What’s in it for you?

• Opportunity to deal with top-notch technologies and approaches in a world-leader product company with millions of customers
• Opportunity to make a difference for online privacy, freedom of speech, and net neutrality
• Decent market rate compensation depending on experience and skills
• Developed corporate culture: no micromanagement, culture based on principles of truth, trust, and transparency
• “You build it, you own it” mentality in most contexts
• Support of personal and professional development
  • coverage of costs of external trainings, conferences, professional literature
  • support of experienced colleagues
  • in-house events and trainings
  • regular knowledge sharing in teams
  • English classes and speaking clubs
• Life-balance support
  • truly flexible schedule, no time-tracking at all
  • 25 working days of vacation
  • 5 days of paid sick leave per month (if necessary) without providing a medical certificate
  • generous maternity / paternity leave program
• Professionally strong environment, friendly and open atmosphere, ability to influence the product development and recognition for it

Blackthorn Vision is looking for a Middle/Middle Strong .NET Engineer. Our client, established in 2011 and based in Colorado, is a leading player in the U.S. application management market. We’ve had a successful partnership with this client and are seeking candidates who are eager to take ownership and improve a product already trusted by over 6,000 enterprises.

Requirements:

• 4+ years of commercial experience working on the backend as a .NET developer.
• Cloud systems development experience.
• Understanding of data access technologies, including Entity Framework and MongoDB.
• Experience with both SQL and NoSQL databases.
• Experience with microservice-oriented architecture, parallel, and asynchronous programming design patterns.
• Experience with Kubernetes, Docker, and RabbitMQ.
• Proven experience with Azure technologies: Azure Entra ID, Azure Storage accounts, Azure Service Bus, Azure Container Registry.
• Knowledge of design and architectural patterns.
• English level: Upper-Intermediate.

Responsibilities:

• Develop and maintain high-quality software solutions using .NET 8.0.
• Take full ownership of delivering new features to end users, including designing architecture, implementing, testing, and onboarding the customer support team with new functionality.
• Collaborate with product owners, the support team, and end users to understand project requirements and deliver solutions.
• Participate in code reviews to enhance overall code quality.
• Ensure applications are high-performing, responsive, and of excellent quality.
• Troubleshoot and resolve technical issues and defects promptly.
• Create code documentation, technical specifications, and architecture diagrams for new features.
• Follow agile methodologies and participate in regular sprint planning and review meetings.

You are compatible with us if you:

• Have a strong product mindset.
• Have a proactive approach to taking ownership of decisions/features.
• Possess a strong, curiosity-driven mindset.
• Are comfortable with challenges.
• Have the ability to collaborate and build relationships with diverse personalities.
• Demonstrate customer-focused decision-making.
• Exhibit clear and timely communication.
• Are open to giving and receiving constructive feedback.
• Value the quality of your code.
• Are able to solve the required technical tasks and communicate throughout the process (for example, asking clarifying questions promptly).

The family-style company is looking for a talented  Optimizely developer to join our team. If you are looking for an awesome team, send us your CV!

What we are looking for

Must have:

• 6+ years of commercial experience with C# / .NET
• Strong English skills — you should feel comfortable communicating with an international client and team
• Experience in migrating or upgrading solutions from Optimizely CMS 11 to CMS 13 

• We also expect you to be a really self-driven person because micromanagement and total control are not about UKAD.

   

Project technical stack:

Backend: .NET 6/7, ASP.NET Core, C#, REST API, GraphQL
Frontend: HTML / CSS / SCSS, JavaScript / TypeScript, React / Vue
Nice to have: Azure (App Services, Azure SQL, Azure Storage), Docker, CI/CD: Azure DevOps / GitHub Actions, Optimizely CMS

Our typical tasks list:

• Develop well-designed, easily maintainable, scalable, and reusable software
• Develop the solution according to existing software architecture defined by the architect
• Maintain software architecture documentation: diagrams, code samples, API descriptions, etc.
• Research, study, and develop technical solutions and technologies
• Implement performance/load/stress testing procedures according to project needs
• Enhance knowledge of preferred technologies, methodologies, standards, and policies
• Review design prototypes, participation in tech review.

What we offer:

• Remote or hybrid work
• Flexible working hours. You can start your working day between 08:00 and 11:00
• Full-time employment
• Professional development and mentoring
• Support for conferences, courses, and meetups
• Equipment provided for work
• Social benefits package
• A friendly, collaborative team with minimal bureaucracy
• Challenging technical tasks and the opportunity to work with modern development and AI tools
•  Feel free to choose technologies and solutions, in which you believe, as well as to be creative and responsible for the results.

Some facts about UKAD to help you make a decision:

During 2022-2025, we only increased cooperation with our foreign partners.

UKAD combines benefits of family-sized companies, like no bureaucracy, easy access to the executives, with sustainable growth and vast opportunities.

Our company is strong enough to be not just a vendor but a tech partner. We can afford to choose customers that respect developers

UKAD is one of the leading employers in Kharkiv, according to DOU.

Aren't we the company you're looking for?

We are looking for C# developer for our music software

( work in Lviv or Kyiv,

remote work possibility ):

www.MusConv.com

About the project:

MusConv is b2c music software which helps people synchronize their music between music services: Spotify, Apple Music, YouTube Music, Amazon Music, Tidal and others.

We offer:

Challenging interesting project

Professional growth and development program

Flexible schedule

Team of highly talented individuals

Access to developer courses like https://www.pluralsight.com

Mentor: code reviews, studying( fiddler, postman, asynchronous programming, etc.)

5% of sources is simple gui based on xaml( avalonia similar to wpf )

95% of sources is regular .net standard( backend to interact with different music services )

We are looking for C# developer to implement new features

As our Senior AI Engineer, you'll own the intelligence layer of the platform — the gateway, tools, retrieval, and evaluation that let an AI assistant read and act inside a regulated ERP as the signed-in user, and never as anything more. In manufacturing that answers to auditors, an assistant that's confidently wrong, or that touches a record it shouldn't, is worse than no assistant at all. Your work is making AI trustworthy enough to put in front of a quality manager.

This isn't a role for working through a queue of well-specified tickets.

 You'll take large features from a loose problem statement to production — agentic workflows, AI on mobile for the shop floor, and the system and infrastructure changes underneath them. You'll decide what to build as much as how, and you'll push for the breakthrough features that make customers switch, not only the ones already on the roadmap.

The ideal candidate thrives in startup ambiguity, moves with real urgency, and has a track record of turning open-ended problems into shipped products without waiting to be told what's next.

What You'll Do

01 — Take large features from idea to production.

Own agentic workflows and AI on mobile end to end. Start from the user's problem, shape the solution, write the plan and the tickets, build the React and mobile interfaces that make AI output trustworthy and actionable, ship it, and measure whether it worked.

02 — Make and own large system changes.

Propose, defend, and carry through the architecture and infrastructure the AI layer depends on — background agents and job queues, observability, cost metering, per-tenant limits, and model version pinning.

Required Qualifications

- 8+ years building and shipping production software, including 2+ years shipping LLM-powered features to real users, and a track record of owning large features end to end.

- AI-native engineering practice — you've rebuilt how you work around agents rather than adding them to an old workflow. Claude Cowork as your primary tool, with strong hands-on experience using Claude Code, Cursor, Codex, or similar; you direct agents through most of the implementation and stay disciplined about the quality, stability, and extensibility of what they produce.

- Product sense and ownership — you work from problems, not specs. You figure out what users and the business actually need, write your own tickets, make the call when the answer isn't obvious, and drive work to done without needing direction repeated.

- Production LLM application engineering — tool calling, structured output, prompt and context design, and streaming, with Claude, OpenAI, or similar, via AWS Bedrock or direct APIs.

- Retrieval-augmented generation in production — chunking, embeddings, and hybrid search on pgvector or equivalent, with access control enforced at retrieval time.

- Evaluation and AI security discipline — you've built eval suites that gate releases, and you design against prompt injection, data leakage through tool output, and cross-tenant access from the start.

- Strong TypeScript, React, and Next.js in production — enough to own the AI experience end to end rather than hand it off.

- Production experience with PostgreSQL — schema design, query optimization, and operating it at scale.

- Hands-on with AWS services — Bedrock, RDS, Fargate, S3, VPCs, IoT Core, DynamoDB, and related infrastructure.

- Disciplined engineering fundamentals — SOLID, DRY, and Domain-Driven Design applied to complex business domains, with unit and integration tests as part of your normal workflow.

- B.S. in Computer Science, Mathematics, Physics, Engineering, or equivalent practical experience.

Preferred Qualifications

- Early-stage startup experience — you've shipped at weekly cadence, owned outcomes rather than tasks, and built something new that changed what the product could do.

- Shipped mobile applications — React Native or similar — for field, operator, or shop-floor use.

- Experience building manufacturing software or Industrial IoT systems — ERP, MES, or SCADA platforms, or machine connectivity over MQTT, OPC-UA, or similar.

- Hands-on with the Model Context Protocol — MCP servers or clients, and OAuth 2.1 authorization for agents.

- C# / .NET experience, as our core services move to a C# and AWS architecture.

- Exposure to compliance frameworks such as SOC 2, GAMP 5, ISO 13485, 21 CFR Part 11, or similar.

Readiness to work from 16:00 till 01:00 in order to have an optimal overlap of work hours with USA based teams.

We are looking for a Senior Full-Stack Developer to join a UK-based digital healthcare company that combines digital tools with clinical expertise to deliver medical and wellbeing services through its online platform.

This role is backend-weighted: you will build ASP.Net Core services that power patient-facing products, and also work on the React frontend that consumes them.

What you'll do

• Design and build ASP.Net Core Web APIs and the data layer behind them (Entity Framework Core, SQL Server);
• Implement background processing: queues, scheduled jobs, and event-driven messaging;
• Build and maintain frontend features in React and TypeScript;
• Work with Azure services across the stack: App Service, Storage Queues, Event Grid, SignalR;
• Cover your work with tests on both sides: xUnit and Moq on the backend, Vitest or Jest and Playwright on the frontend;
• Take part in code review, architectural decisions, and CI/CD improvements.

Requirements

• 5+ years of commercial development experience;
• Strong C# and .NET: ASp.Net Core Web APIs, Entity Framework Core, SQL Server;
• Solid experience designing REST APIs;
• Practical experience with background processing: queues, scheduled jobs, event-driven messaging;
• Strong React and TypeScript: hooks, React Query or similar, component libraries such as MUI;
• Hands-on experience with Azure (App Service, Storage Queues, Event Grid, SignalR);
• Git, Docker, and CI/CD (GitLab);
• Testing: xUnit and Moq, Vitest or Jest, Playwright;
• Good spoken and written English.

Nice to have

• Node.js and NestJS;
• MongoDB, Redis;
• Nx monorepo, Redux Toolkit;
• Terraform;
• Datadog or similar observability tooling.

We’re working on a product that powers real conversations — an intelligent call center platform built to handle serious communication volumes. Think smart call routing, live dashboards, VoIP, and deep CRM integrations. The system is already running, already growing, and needs an engineer who wants to help shape where it goes next.

📍 Lviv / Remote · Full-time · 3+ years · English Upper-Intermediate

Stack:

.NET 6+ / C# · React.js · TypeScript · MS SQL Twilio · WebRTC · SignalR · Azure (optional)

What You’ll Do:

→ Build and maintain features across the full stack

→ Integrate telephony and CRM systems via APIs

→ Work on performance and scalability

→ Take part in code reviews, estimations, and tech discussions

What We’re Looking For:

→ 3+ years with .NET (C#) and React.js in commercial projects

→ Good understanding of web architecture and client-server communication

→ Experience with REST APIs, relational databases, Git

→ English B2

What’s in It for You

✦ Stable long-term project

✦ Mentorship and regular growth conversations

✦ Remote or hybrid

✦ 18 vacation + 5 sick + 10 extra days off per year

✦ Accounting support, office lunches, team events

✦ Work Anniversaries -Special gifts to celebrate milestones.