Senior Software Engineer at MNTN

You're a Senior Software Engineer with at least 5 years of JavaScript/TypeScript experience, particularly on the backend, and a strong understanding of microser

Work type: remote

Location: United States

Type: Full-time

Summary

You're a Senior Software Engineer with at least 5 years of JavaScript/TypeScript experience, particularly on the backend, and a strong understanding of microservice architectures. You're proficient with modern cloud platforms and comfortable building RESTful APIs. **What makes it worth a look...** This is a fully remote, full-time Senior Software Engineer role at MNTN. The company offers a competitive compensation package and unique benefits like a three-day weekend every month. **You might be a good fit if you...** * Spend about 70% of your time building and scaling backend services in Bun + TypeScript. * Craft micro-frontends with React and Webpack Module Federation for the remaining 30%. * Design and evolve REST/tRPC APIs in a micro-service, event-driven architecture. * Leverage job/queue systems like BullMQ or AWS SQS, and use AI development tools daily.

Job Description

At MNTN, we put our people first, full stop. This allows our company culture to be defined by our team members and their shared values, like trust, ambition, quality, radical honesty, and compassionate leadership. It’s why we all really love working for the Hardest Working Software in Television™ (and also why we were named one of Ad Age’s Best Places To Work in 2025.)

We pride ourselves on bringing unrivaled performance and simplicity to Connected TV advertising. Our self-serve technology makes running TV ads as easy as search and social, helping brands drive measurable conversions, revenue, site visits, and more. It’s what led MNTN to being named one of Fast Company's Most Innovative Companies in 2023. You can learn more about us and everything we do by visiting [https://mountain.com/](https://mountain.com/).

We’re committed to innovation that empowers, not replaces. At MNTN, AI is a tool for growth, enhancing efficiency while keeping a people-first approach. Our goal is to streamline workflows and drive new solutions—without compromising the human element that makes our company great.

So if wanting to do more, own more, and make a bigger impact comes naturally to you, then you may be the person we're looking for to join us in our next stage of growth.

We're looking for a Senior Software Engineer to join our Billing Squad. The Billing Squad owns every user-facing UI—serving both customers and internal teams—as well as every backend touch‑point for billing and invoicing. We build microservices and micro‑frontends that keep revenues flowing and finance joyful. If designing resilient payment flows and partnering with Finance to ship features that literally keep the lights on excites you, read on.

What you'll do

• Spend ~70 % of your time building and scaling backend services in Bun + TypeScript that power billing & invoicing workflows.

• Craft the remaining ~30 % in the UI, building micro‑frontends with React and Webpack Module Federation.

• Design and evolve REST/tRPC APIs that fit a micro‑service, event‑driven architecture.

• Leverage modern job/queue systems (e.g. BullMQ, AWS SQS, Google Cloud Tasks or similar) to orchestrate long‑running and scheduled workloads.

• Use AI development tools (Cursor, GitHub Copilot, ChatGPT, etc.) every day to enhance productivity and code quality.

• Write clean, well‑tested, and observable code; automate everything via CI/CD.

• Collaborate with Finance, Product, and fellow engineers to ship reliable billing features and continuously improve platform resilience.

• Champion security and data‑protection best practices across services that handle payment data.

• You will ramp quickly on our billing domain—understanding invoicing workflows, credit systems, and how services integrate across our platforms.

• You take ownership of revenue-impacting features (invoicing, payments, tax, credits) and deliver high-quality solutions with strong attention to detail.

• You contribute across the stack—building reliable backend services and APIs while delivering clean, intuitive UI in our billing micro-frontends.

• You proactively identify edge cases, partner closely with Finance to ensure accuracy, and help prevent production issues.

• You are hands-on in production support, debug effectively, and improve system reliability over time.

• You participate actively in refinement, ask thoughtful questions, and help increase clarity and velocity.

• You build strong cross-functional relationships and are a dependable, proactive contributor to the team.

• 5+ years of JavaScript/TypeScript experience, with a backend focus; strong skills in building RESTful APIs (or tRPC) in microservice architectures.

• Proficient with modern cloud platforms (GCP preferred), service-oriented architectures, and scalable system design.

• Hands-on with job/queue systems (e.g., BullMQ, SQS, Redis), CI/CD pipelines, Git workflows, testing frameworks, and observability tools.

• Strong React expertise, including micro-frontends and Module Federation; solid HTML/CSS knowledge with accessibility and cross-browser awareness.

• Experienced with relational databases (PostgreSQL preferred) and writing performant SQL.

• Regularly use AI coding tools (e.g., Cursor, Copilot, ChatGPT) to enhance productivity.

• Skilled in authentication/authorization across systems and translating business needs into technical solutions

• 100% remote within the US

• Flexible vacation policy

• Annual vacation allowance for travel related expenses

• Three-day weekend every month of the year

• Competitive compensation

• 100% healthcare coverage

• 401k plan

• Flexible Spending Account (FSA) for dependent, medical, and dental care

• Access to coaching, therapy, and professional development

Our recruiters will always reach out using an email address ending with @mountain.com OR @mntn.com. If you’re contacted by someone without that address and they mention a Reference Code (which we never use), then that ain’t us folks.Tell those trolls to take a hike–you’re waiting to climb a MNTN.

MNTN provides advertising software for brands to reach their audience across Connected TV, web, and mobile. MNTN Performance TV has redefined what it means to advertise on television, transforming Connected TV into a direct-response, performance marketing channel. Our web retargeting has been leveraged by thousands of top brands for over a decade, driving billions of dollars in revenue.

Our solutions give advertisers total transparency and complete control over their campaigns all with the fastest go-live in the industry. As a result, thousands of top brands have partnered with MNTN, including Tarte, Decked, and National University.

#LI-Remote

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