Senior .NET Engineer

Capital Markets Gateway

9h•Remote

About The Position

Capital Markets Gateway LLC (CMG) is a capital markets-focused fintech company that is transforming global equity capital markets (ECM) through data, technology, and connectivity. CMG is the preferred source for ECM analytics and the first network connecting the buy-side and sell-side for ECM workflows. Founded in 2017, CMG is backed by prestigious financial institutions and its platform is used by nearly 150 buy-side firms and 22 global investment banks. The company is seeking a Senior .NET Engineer to build scalable, secure, and high-performing enterprise solutions for the financial industry. This role involves designing, developing, and maintaining robust backend systems and APIs, collaborating with frontend engineers, product managers, and QA teams to ensure seamless data flow, system reliability, and efficient service integration. Key contributions will include optimizing performance, enhancing system architecture, and applying best practices in software development, security, and deployment. The CMG engineering team values collaboration, cross-domain knowledge sharing, and a passion for modern technologies and best practices. Engineers are encouraged to challenge the status quo, seek improvements, and explore leading-edge technologies like AI, with an emphasis on research and prototyping for impactful engineering decisions. The team follows best practices including pull requests, test automation, code coverage tracking, containerization, and one-click deployments.

Requirements

C#, ASP.NET Core: 3+ years.
Software Engineering: 5+ Years.
Must be based in LATAM.
English level - C1 or C2.

Nice To Haves

Fintech experience is a plus.
Experience developing AI-powered applications is a plus.

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 tools like OpenAI Codex and GitHub Copilot 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, ASP.NET Core, and GraphQL.
Comfortable stepping into front-end work when the problem calls for it, since AI-assisted development means you don't need to be a specialist to ship quality UI.
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.
Be a first responder for production. Use DataDog, Grafana, OpenTelemetry, and Microsoft Azure to quickly diagnose incidents, minimize impact, and harden the system against recurrence.