Fullstack Engineer - Billing

MNTN; United States; Remote; USD 100,000 - 140,000; Full time

Job summary

A leading company in Connected TV advertising is seeking a Backend Engineer for their Billing Squad. This role focuses on building and scaling backend services and collaborating across departments to enhance billing and invoicing workflows. The ideal candidate thrives in a remote environment and has strong expertise in JavaScript, TypeScript, and microservices.

Benefits

100% remote within the US

Flexible vacation policy

Annual vacation allowance for travel expenses

Three-day weekend every month

Competitive compensation

100% healthcare coverage

401k plan

Flexible Spending Account (FSA)

Access to coaching and professional development

Qualifications

• 4+ years of JavaScript/TypeScript experience, backend focus.
• Proficient with modern cloud platforms, service-oriented architectures.
• Experienced with CI/CD pipelines, Git workflows, testing frameworks.

Responsibilities

• Build and scale backend services in Bun+TypeScript for billing workflows.
• Design REST/tRPC APIs for micro-services, event-driven architecture.
• Collaborate with teams to improve platform resilience.

Skills

JavaScript

TypeScript

RESTful APIs

Cloud Platforms

CI/CD

React

SQL

Microservices

Security Best Practices

Observability

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 allreallylove working for the Hardest Working Software in Television (and also why we were named one of Ad Age’s Best Places To Work in 2024.)

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 and helps 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/.

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.

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, AWSSQS, Google Cloud Tasks or similar) to orchestrate long‑running and scheduled workloads.
• Use AI development tools (Cursor, GitHubCopilot, 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.

What You’ll Bring:

• 4+ 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.

MNTN Perks:

• 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

About MNTN:

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), thenthat 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 Build with Ferguson Master, OneWheel, Tarte, Decked, and National University.

#LI-Remote