Senior Software Engineer

MNTN

5h•Remote

About The Position

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/. 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 MNTN Creative Delivery Services team manages ad delivery from backend to front end. As part of this team, you’ll contribute to the core infrastructure that drives creative processing, delivery, and optimization across our entire platform. You'll be joining the group that owns our high-volume ad server and the pipelines that manage how creative assets are ingested, transformed, and served. As a Backend Engineer, you'll play a key role in developing scalable systems, improving performance, and building new integrations that expand creative capabilities for some of the world’s most recognizable brands. Your work will directly impact the flexibility, speed, and reliability of our ad experiences—at scale.

Requirements

5+ years building production-grade backend systems in Java, Kotlin, or Scala
A product mindset — you care about why you’re building something, not just what you’re building
Experience designing and operating high-scale, distributed systems
Strong SQL fundamentals — schema design, indexing strategies, query optimization, and performance tuning
Comfort working across multiple technologies and services, even outside your primary language
Solid understanding of RESTful APIs and microservices architecture
Familiarity with messaging systems (e.g., Kafka) and asynchronous processing patterns
Practical use of AI-assisted development tools (Cursor, ChatGPT, LLM copilots) to improve speed and quality

Responsibilities

Design, build, and operate high-throughput Java/Kotlin services that power our ad server and creative delivery pipelines
Own systems end-to-end — from API design and ingestion flows to transformation, caching, and global delivery
Work across the stack when needed (Rust services, Kafka streams, Terraform, relational databases) to solve the right problem with the right tool
Improve performance, observability, and resiliency of critical production systems running at scale
Partner closely with Product and Project leads to translate business needs into scalable technical solutions
Contribute to architectural decisions that shape the future of our creative platform
Raise the engineering bar through thoughtful code reviews, design discussions, and pragmatic best practices