Jobs C# / .NET

Who we are and who we’re looking for:

Cleo is not a place for developers who want to hide behind tickets and meetings.

We've built and are now evolving a next-generation trading platform, engineered for thousands of concurrent traders, delivering transparency and features unmatched in the industry, challenging and slowly beating giant corporations 100x our size.
 

Our success is rooted in a developer-first environment, free from middle management and corporate red tape - just pure focus on building. Extraordinary teams are built by extraordinary people - if you’ve ever felt unable to reach your full potential, felt a lack of impact, or weren’t challenged enough in your previous jobs, Cleo is the place to change that. If you ever wondered how your favorite tech influencer built his skillset and knowledge - join our team and experience the journey yourself, but don’t expect it to be easy.

This is an AI-native engineering role: you’ll be expected to use AI tools heavily for coding, testing, research, refactoring, and workflow automation - while still owning the correctness of the output.

Ideal candidate must:

• Genuinely enjoy software development

• Understand system design and design patterns beyond textbook definitions

• Can debug hard problems without waiting for perfect instructions

• Can explain technical tradeoffs clearly even to non-technical people

• Keep up with new tools, frameworks, and AI workflows

• Be proactive and take ownership instead of waiting to be assigned every task

What can you expect?

• Taking ownership of important parts of the project

• Working remotely with flexible working hours

• No corporate management or unnecessary meetings, just pure software development

• You will not just be following tasks; you will be assessing what needs to be done by yourself

• Working with the latest modern frameworks, services, and AI tools

• An amazing team of smart people where your ideas will be heard

What will you actually do?

• Categorical examples of tasks you might get:

○ Designing & implementing distributed cache for microservices

○ Implementing resilient trading data WebSocket streams

○ Optimizing order matching systems

○ Refactoring public APIs and docs

○ Researching new AI tools for suitability in our workflows

○ Setting up automated parallel AI testing pipelines

• Exploring new frameworks, services, and AI tools, then deciding what is actually useful

• Using AI heavily, but not blindly - verifying outputs, building guardrails, and improving workflows

• Architecture and system design of small components up to big services

Our tech stack:

• .NET C#, React - TypeScript

• MongoDB, PostgreSQL, EF

• Microservices, RabbitMQ, SignalR, ELK stack

Our hiring process:

1. Screening: 15-40 min MS Teams call with our Dev Team Lead

2. Task: Take-home coding task (you can use AI)

3. Follow-up: Call with 1-2 devs about your task solution + follow-up questions

4. Final evaluation: Call with our CEO to discuss the role and expectations in detail

Remuneration depends on skill level, ownership, and the value you can create. For this role, we expect most candidates to land around 2k-3k $/month, with room to go higher for someone who can take serious ownership from day one. Across the company, our technical compensation range is roughly 1.5k-5k $/month, from junior to senior-level contributors. We don’t care much about years of experience on a resume; we care about what you can actually deliver. We know that a hardworking developer with one strong year can outperform someone with 10 years in the industry, which we reward accordingly.

We move quickly, but we also filter quickly. If you bluff, exaggerate your experience, ignore the job post, or try to cheat your way through the process, it will become obvious fast and will only waste your time and ours.

We’re looking for a skilled .NET C# Developer. 

If you’re passionate about building secure, scalable APIs, working with established systems while helping guide our shift toward the cloud, and are excited by the opportunity to explore machine learning integration—this is your chance to be part of something that truly matters. 

Requirements 

• 3+ years of professional experience in .NET C# development 
• Proficiency with Entity Framework (preferably EF Core) 
• Strong command of SQL, including complex query writing and optimization 
• Experience building RESTful APIs with ASP.NET or ASP.NET Core 
• Familiarity with version control systems, especially Git 
• Solid problem-solving and debugging skills 
• Ability to communicate effectively and work independently or as part of a team 

Nice-to-haves 

• Exposure to Azure services such as App Services, Azure SQL, and Azure Functions 
• Basic understanding of machine learning model integration via APIs or Azure ML 
• Familiarity with OData, microservices, and distributed systems concepts 
• Experience writing unit tests (e.g., xUnit, NUnit, MSTest) 
• Knowledge of CI/CD practices, especially using GitHub Actions 
• Interest or experience in DevOps practices and automation 

Core Responsibilities

• API Development: Design, build, and maintain RESTful APIs using .NET C#, focusing on performance, reliability, and security. 
• Entity Framework & SQL: Develop efficient data models using Entity Framework Core, and write optimized SQL queries for relational databases like SQL Server. 
• Cloud Transition Support: Contribute to new development efforts that utilize Azure services (e.g., Azure Functions, App Services, Azure SQL) as we begin migrating from on-prem infrastructure. 
• Machine Learning Integration: Collaborate with stakeholders to integrate machine learning models via RESTful APIs or Azure ML services. 
• Clean, Maintainable Code: Follow best practices to write testable, maintainable, and well-documented code. 
• Cross-Team Collaboration: Work closely with fellow developers and business partners to deliver secure, scalable solutions. 
• CI/CD Practices: Support continuous integration and delivery efforts using tools like GitHub Actions. 
• Problem Solving: Investigate and resolve performance issues, bugs, and bottlenecks in existing systems. 

About Us 
Established in 2011, Trinetix is a dynamic tech service provider supporting enterprise clients around the world. 

Headquartered in Nashville, Tennessee, we have a global team of over 1,000 professionals and delivery centers across Europe, the United States, and Argentina. We partner with leading global brands, delivering innovative digital solutions across Fintech, Professional Services, Logistics, Healthcare, and Agriculture. 

Our operations are driven by a strong business vision, a people-first culture, and a commitment to responsible growth. We actively give back to the community through various CSR activities and adhere to international principles for sustainable development and business ethics. 

We’re looking for a skilled .NET C# Developer. 

If you’re passionate about building secure, scalable APIs, working with established systems while helping guide our shift toward the cloud, and are excited by the opportunity to explore machine learning integration—this is your chance to be part of something that truly matters. 

Core Responsibilities: 

• API Development: Design, build, and maintain RESTful APIs using .NET C#, focusing on performance, reliability, and security. 
• Entity Framework & SQL: Develop efficient data models using Entity Framework Core, and write optimized SQL queries for relational databases like SQL Server. 
• Cloud Transition Support: Contribute to new development efforts that utilize Azure services (e.g., Azure Functions, App Services, Azure SQL) as we begin migrating from on-prem infrastructure. 
• Machine Learning Integration: Collaborate with stakeholders to integrate machine learning models via RESTful APIs or Azure ML services. 
• Clean, Maintainable Code: Follow best practices to write testable, maintainable, and well-documented code. 
• Cross-Team Collaboration: Work closely with fellow developers and business partners to deliver secure, scalable solutions. 
• CI/CD Practices: Support continuous integration and delivery efforts using tools like GitHub Actions. 
• Problem Solving: Investigate and resolve performance issues, bugs, and bottlenecks in existing systems. 

Requirements 

• 3+ years of professional experience in .NET C# development 
• Proficiency with Entity Framework (preferably EF Core) 
• Strong command of SQL, including complex query writing and optimization 
• Experience building RESTful APIs with ASP.NET or ASP.NET Core 
• Familiarity with version control systems, especially Git 
• Solid problem-solving and debugging skills 
• Ability to communicate effectively and work independently or as part of a team 

Nice-to-haves 

• Exposure to Azure services such as App Services, Azure SQL, and Azure Functions 
• Basic understanding of machine learning model integration via APIs or Azure ML 
• Familiarity with OData, microservices, and distributed systems concepts 
• Experience writing unit tests (e.g., xUnit, NUnit, MSTest) 
• Knowledge of CI/CD practices, especially using GitHub Actions 
• Interest or experience in DevOps practices and automation  

About us:

EveryMatrix is a leading B2B SaaS provider delivering iGaming software, content and services. We provide casino, sports betting, platform and payments, and affiliate management to 200 customers worldwide.

But that's not all! We're not just about numbers, we're about people. With a team of over 1000 passionate individuals spread across twelve countries in Europe, Asia, and the US, we're all united by our love for innovation and teamwork.

EveryMatrix is a member of the World Lottery Association (WLA) and European Lotteries Association. In September 2023 it became the first iGaming supplier to receive WLA Safer Gambling Certification. EveryMatrix is proud of its commitment to safer gambling and player protection whilst producing market leading gaming solutions.

Join us on this exciting journey as we continue to redefine the iGaming landscape, one groundbreaking solution at a time.

We are looking for a passionate and dedicated Senior .Net Developer to join our team in Lviv!
 

What You'll get to do:

• Hands-on development and integration of the evolving business functionality on the core part of the platform with other office locations.
• Understanding business requirements and their mapping to the given software framework.
• Discussing business requirements along with the Team Leader, Business Analysts, Project Managers, and other parties involved.
• Adhering to the Agile methodology and design principles of the project.
• Working in a test-driven, object-oriented environment.
• Participating in the design and implementation of the new architecture of the next-generation GamMatrix platform.
• Offering the QA and support team assistance whenever issues arise.
• Adhere to best practice development standards (such as continuous integration and deployment).
• Ability to understand the complex technical architecture.
• Ability to manage multiple priorities, commitments and tasks.

What You need to know:

• Experience with ASP.NET 4+ Frameworks and .Net Core 3.1+.
• Good understanding and experience with relational database systems (MSSQL Server, PostgreSQL) GIT, CI/CD practices.
• Strong knowledge of OOP, SOLID principles, and design patterns.
• Experience with multi-thread programming.
• Experience using containerization technologies (Docker) and orchestration technologies (Kubernetes).
• Experience implementing and using message queues (Kafka, Rabbit MQ).
• Hands-on experience writing unit tests.
• Experience with distributed caching solutions (Redis).
• Knowledge of n-tier applications, distributed applications.
• English proficiency.

Nice to have:

• Strong knowledge of C#.
• Experience with building and managing microservices, parallel and asynchronous programming design patterns.
• Experience building REST APIs and self-description services (ex: Swagger).
• Experience with Log Systems: Grafana, Kibana.
• Experience with modern software development life-cycle.
• Development experience with web services.
• Self-motivated and result-oriented.
• Excellent communication skills (oral and written).
• Analytical mindset.
  
  Here's what we offer:
• Start with 22 days of annual leave, with 2 additional days added each year, up to 32 days by your fifth year with us.
• 3 sick leave days per year, no doctor's note required; 30 medical leave days with medical allowance
• Hybrid work schedule is available after the first three months of employment, with up to 50 days of work from home per year.
• Benefit from two Free Fridays each year, limited to one per quarter.
• Daily catered lunch or monthly lunch allowance. 
• Private Medical Subscription. 
• Access online learning platforms like Udemy for Business, LinkedIn Learning or O’Reilly, and a budget for external training.
• Gym allowance.
• Corporate English lessons.
• Support for New Parents:
• 21 weeks of paid maternity leave, with the flexibility to work from home full-time until your child turns 1 year old.
• 4 weeks of paternity leave, plus the flexibility to work from home full-time until your child is 13 weeks old.

Our office perks include on-site massages and frequent team-building activities in various locations.

At EveryMatrix, we're committed to creating a supportive and inclusive workplace where you can thrive both personally and professionally. Come join us and experience the difference! 
 

Job Description

● 4+ years of development experience with the .NET platform.
● Experience with ASP.NET Core Web API, SOA, Cloud Services (AWS).
● Experience with React. Patterns: SPA, Micro Frontend Architecture (is a plus)
● TypeScript development experience.
● Experience in client/server unit testing.
● Experience with gRPC is a plus
● Experience with AWS infrastructure is a plus: S3, Lambda (Python Runtime)
● Good debugging, coding, and design skills.
● Demonstrated ability to come up-to-speed quickly on a new technical domain/product area.
● Good written and verbal communication skills.

Job Responsibilities

● Implement new features, unit tests, automated integration tests for the complex healthcare system
● Participate in estimation and planning sessions
● Investigate different complexity issues and debug code
● Business communication and close collaboration with all project stakeholders on a daily basis

Department/Project Description

Our client is a big medical equipment manufacturer located in the United States. We have completed a lot of projects for them during the last 18+ years and continue our strong relationship. We are creating software information systems providing management and reporting capabilities for customer equipment in the field. Currently, we are extending our team and looking for a passionate and motivated Middle to Senior Full Stack .Net Engineer with 4+ years of relevant experience. The right candidate must be a team player with strong communication skills and be comfortable working in a fast-paced environment.

🌎Akvelon is an American company with offices in Seattle, Mexico, Ukraine, Poland, and Serbia. Our company is an official vendor of Microsoft and Google. Our clients also include Amazon, Evernote, Intel, HP, Reddit, Pinterest, AT&T, T-Mobile, Starbucks, and LinkedIn. To work with Akvelon means to be connected with the best and brightest engineering teams from around the globe and working with an actual technology stack building Enterprise, CRM, LOB, Cloud, AI and Machine Learning, Cross-Platform, Mobile, and other types of applications customized to client’s needs and processes.

Requirements:

Must have:

• 0–1 year of commercial experience (internships and strong pet projects count)
• Working knowledge of C# and .NET 6/7/8
• Basics of ASP.NET Core and REST APIs
• SQL fundamentals and Entity Framework Core
• Git basics (branching, pull requests, merging)
• English B1+ for reading docs and team communication

Nice to have:

• Azure (App Service, Functions, DevOps)
• Unit testing (xUnit / NUnit, Moq)
• Docker and CI/CD basics
• Common design patterns and Dependency Injection

Overlap: stay available until 7 PM CET

Working conditions and benefits:

• Flexible working schedule: 8 hours per day, 40 hours per week
• Paid vacation, sick leave (without a sickness list)
• Official state holidays – 11 days considered public holidays
• Professional growth while attending challenging projects and the possibility to switch your role, master new technologies and skills with company support
• Personal Career Development Plan (CDP)
• Employee support program (Discount, Care, Health, Legal compensation)
• Paid external training, conferences, and professional certification that meet the company’s business goals
• Internal workshops & seminars
• Corporate library (Paper/E-books) and internal English classes.

Step into your future – apply now 🚀 and send us your CV.