Senior .NET Engineer

The role requires an on-site presence in the Brno office a couple of days per month.
 
The Company
 
Capital Markets Gateway LLC (CMG) is a capital markets-focused fintech transforming global equity capital markets (ECM) through data, technology, and connectivity. As the preferred source for ECM analytics and the first network connecting the buy-side and sell-side for ECM workflows, we are committed to reshaping how capital markets operate. Founded in 2017 by a team of ECM practitioners, CMG has completed three successful fundraising rounds and is backed by a group of the world’s most prestigious financial institutions. The CMG platform is currently relied upon by 25 global investment banks and 135 asset managers representing $40 trillion in AUM. For more information, please visit www.cmgx.io.  
The Role 
We’re looking for a Senior .NET Engineer to join our team to help build scalable, secure, and high-performing enterprise solutions for the financial industry. As a Senior .NET Engineer, you will play a key role in designing, developing, and maintaining robust backend systems and APIs that power our core products. You’ll collaborate closely with frontend engineers, product managers, and QA teams to ensure seamless data flow, system reliability, and efficient service integration. Your contributions will include optimizing performance, enhancing system architecture, and applying best practices in software development, security, and deployment to support rapid and reliable product delivery. 
 Our Engineering Team 
The CMG engineering team consists of domain experts who work collaboratively within a culture of cross-domain knowledge sharing. We value engineers who are passionate about modern technologies and best practices. 
 
Our engineers are encouraged to challenge the status quo and are constantly seeking improvement and efficiency in our code-base and platform. CMG engineers are empowered to explore solutions using leading edge technologies such as AI and bring recommendations to the table. We are in a period of making impactful engineering decisions. 
 
As part of our process, we believe in taking the time for research and prototyping - this is critical in making the right decisions. Given the experience of our team, we have naturally adopted best practices from local development, through code review and into production rollouts. Besides the standard pull requests, test automation, code coverage tracking, containerization, and one-click deployments, we are constantly reviewing these foundational components to develop new best practices.

Responsibilities
Operate as a product engineer focused on solving real user and business problems, not clearing a backlog. You bring ideas, challenge assumptions, and own outcomes. Work in an AI-first development flow. Use Claude not just to go faster, but to do more: explore multiple approaches, validate ideas quickly, and build things that previously wouldn't have been worth the effort. Primarily focused on backend: designing, developing, and maintaining scalable services with .NET 10, and GraphQL. Comfortable stepping into front-end work when the problem calls for it. You're aligned to a product team and typically work alongside one or two other engineers on any given project, pairing on tough problems, reviewing each other's work, and shipping together rather than in parallel. Uphold a high-quality bar. Engineers write their own tests at the unit, integration, and end-to-end levels, and every line of code, human-written or AI-assisted, is reviewed by a human before it ships. Drive technical improvements across the codebase. Proactively identify friction, propose changes, and see them through to adoption. Serve as the first DataLab hire in Czechia, working from our Brno office. Shift your schedule to US Pacific morning hours (until ~20:00 CET) 2-3 days per week to collaborate with the rest of the team, which aligns to US time zones, attend project meetings, and to provide support. Support the product you build by participating in the team’s on-call rotation and responding to production incidents.

Qualifications
Must be based in the Czech Republic. C#, ASP.NET Core: 3+ years. Software Engineering: 5+ Years. English level - C1 or C2. Fintech experience is a plus. Experience developing AI-powered applications is a plus.

Our Tech Stack
Latest .NET version for our backend services. Federated GraphQL .NET server running in Hot Chocolate. MassTransit and RabbitMQ for messaging. Hangfire for our background processing. Redis Cache for distributed caching and real-time messaging. Azure as infrastructure provider. Docker + Kubernetes for microservice orchestration using Istio service mesh. PostgreSQL for relational db, ElasticSearch for indexing, Redis for caching. DataDog and OpenTelemetry for observability. GitHub for our Version Control and CI (with our own runners). React with TypeScript on our front-end.

Our Values
We innovate with purpose We focus on outcomes vs. output We believe diverse and inclusive teams fuel innovation We are humble yet candid We do right by the customer

What we offer
Unlimited vacation Meal vouchers paid in full by the company Multisport card contribution Pension contributions Language courses Centrally located office in the heart of Brno Bi-weekly team lunches provided by the company Tech courses and conferences Top of the line MacBook Company team building events Flexible working hours and the possibility to work from home

CMG embraces our ongoing commitment to building a culture reflecting the people, perspectives, and passions it represents. We will accept nothing less than equity, inclusion, and belonging for all. With the only constant in life being change, we will always listen, learn, and improve for the betterment of our teams, customers, and communities. CMG is proud to be an Equal Opportunity Employer.