Principal Engineer

Principal Engineer - C# - Hybrid Denver, CO Full-Time Hybrid $120,000 - $170,000 /yr

We are a cross-border payments platform. We help SMEs and consumers in the US, UK, Canada, Australia, and New Zealand collect, convert, hold, and send money across markets. We're small enough that your code ships fast and your decisions matter.

What you will be doing:

-Anchor the engineering on complex, high-impact, and open-ended problems across the stack, setting the technical approach other engineers build around.

-Set technical direction and own the consistency and standards the platform depends on across squads.

-Act as a force multiplier: raise the level of the engineers around you through design review, mentorship, sponsorship, and how the team adopts AI, without managing them.

-Stay hands-on, shipping production code on the critical path and the parts that most need senior judgment.

-Partner with product, design, compliance, and engineering leadership to turn ambiguous goals into clear, shippable technical plans.

-Use agentic coding tools (Copilot, Cursor, Claude Code, or equivalent) daily across the SDLC, and lead modernization from legacy services into the modern stack alongside architects and team leads.

What You Need:

-8+ yrs building production software across the full stack, end-to-end.

-Strong frontend proficiency with Vue.js, React, or equivalent.

-Strong backend proficiency in C# /.NET preferred; other OOP languages welcome (Java, Kotlin, Go, or equivalent).

-Frontend fundamentals: responsive design, accessibility, web performance, and internationalization.

-Solid SQL and relational database fundamentals.

-Deep system design and architecture experience, including service-oriented or microservices and event-driven patterns.

-Track record anchoring large, ambiguous, cross-team technical efforts as an individual contributor: setting the technical direction other engineers build around, with impact measured by the engineers and teams you raise, not by personal output.

-Experience mentoring and growing engineers through design review, technical guidance, and sponsorship, without managing them.

-Daily use of agentic coding tools (Copilot, Cursor, Claude Code, or equivalent) across the SDLC, and a clear point of view on how an engineering team should adopt AI.

-Production experience on AWS, including hands-on deployment, CI/CD pipelines and modern deployment practices, and native services such as SQS, DynamoDB, S3, ECS, and Lambda. Payments, FX, or regulated-industry experience.

-Strong written and verbal communication, including the ability to align engineers and stakeholders around a technical direction.

Benefits

-Medical, Dental & Vision Insurance -401K Plan with Match -Employee Stock Purchase Plan -Paid Vacation / Sick Leave -Hybrid Work Schedule -Tuition Assistance -Growth Opportunities -Corporate gatherings & team bonding events -Plumm Mental Health and Wellbeing -Volunteering day for a charity of your choice

For this position you must be currently authorized to work in the United States. We do not sponsor for this position.