Senior Software Engineer - Audience Targeting

Mntn; United States; Remote; USD 140,000 - 210,000; Full time

Job summary

MNTN is hiring a Senior Backend Engineer to join the targeting group, building and improving core models and systems powering our advertising platform. You will develop Kotlin APIs, work across Rust, PySpark and Kafka, and scale services handling massive data volumes daily.

You will collaborate with engineers, data scientists, and product leads, contribute to a strong engineering culture, and ensure reliable, observable systems across cloud environments (AWS/GCP).

Qualifications

• 5+ years of Java, Kotlin, or Scala development experience.
• Strong proficiency in SQL, table design, indexing and other database skills.
• Experience integrating AI tools such as Cursor, ChatGPT and other LLM copilots.
• Experience with Microservice style architecture.
• Familiarity with Git and Linux/UNIX environments.
• Experience on AWS, GCP, or other cloud infrastructure.

Responsibilities

• Create and support Kotlin APIs and services to support our targeting distributed systems.
• Work in environments with Rust, PySpark, Kafka, and various RDBMSes.
• Understand the broader context of our software beyond its components.
• Raise the bar on engineering culture by leading by example.
• Build high volume services that are reliable at scale.
• Work with enormous volumes of data daily.
• Collaborate with Product and Project Leads to explain complex issues.
• Optimize and enhance existing products.

Skills

Java

Kotlin

Scala

SQL

AI integrations

Microservices

Git

Linux/Unix

AWS/GCP

Tools

Rust

PySpark

Kafka

RDBMS

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 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 2026.)

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 Targeting Group helps brands reach the right customers with software that turns petabytes of data into meaningful audience targeting strategies. Our engineers, data scientists and analysts build software that serves content to millions of people every day. You'll be joining the team working on MNTN Matched, our flagship machine learning product that is a critical revenue driver for the business. As a Senior Backend Engineer, you’ll be deeply involved in developing and improving the core models and systems that power our targeting products. Your work will directly influence the quality, efficiency, and innovation of our targeting platform.

What You’ll Do:

• Create and support Kotlin APIs and services to support our targeting distributed systems - the most critical component in our business
• Work in many environments, including languages and tools like Rust, PySpark, Kafka, and several RDBMSes
• Understand the broader context of our software beyond the components you build
• Raise the bar on our engineering culture, leading by example
• Build high volume services that are reliable at scale
• Work with enormous volumes of data (100s of TB daily)
• Collaborate with and explain complex technical issues to Product and Project Leads
• Optimize and enhance existing products

What You’ll Bring:

• 5+ years of Java, Kotlin, or Scala development experience
• Comfort diving in to tech stacks outside your primary specialization
• A desire to understand the purpose and impact of the tools you build
• Strong proficiency in SQL, table design, indexing and other common database skills
• Integration of AI tools such as Cursor, ChatGPT and other LLM based copilots in your workflow
• Experience with Microservice style architecture
• Familiarity with Git and Linux/UNIX environments
• Experience on AWS, GCP, or other cloud infrastructure

About 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