Senior Backend Engineer

Job Description Job Description About Citizen Citizen is the No. 1 public safety app in the U.S., with a mission to make the world a safer place. Citizen provides 911 alerts so people can use their phones to keep themselves, and the people and places they love, safe.

Citizen has notified people to evacuate burning buildings, deterred school buses from nearby terrorist attacks, and led to the rescue of kidnapped children and missing people. Citizen's 911 alerts are accompanied by live stories, real-time updates, and user-generated content so app users never have to wonder why there are helicopters overhead or fire engines flying by. By broadcasting from the scene of an incident, communicating with one another, and reading live updates, communities are empowered by Citizen.

We act fast, break news, and give people the immediate information they need to stay safe. And we're just getting started. Our flagship paid product—Citizen Premium—is a only-of-its-kind personal safety subscription that allows users to reach a digital guardian 24/7 for $20/mo.

Subscribers used Citizen Premium to guide emergency response to remote hiking locations, or travel safely on late-night walks. Citizen Plus, which sits between the free Citizen app and Citizen Premium at $5/mo, currently unlocks 6 new features. Available for the first time ever, Citizen Plus includes the powerful ability to listen to police and fire radios, customize your alerts, unlock past incidents, create alert zones, view nearby registered offenders, and see crime statistics.

Already relied on by millions of people every day, Citizen will expand even further across the United States this year to keep more users safe and informed. We're looking for hardworking, mission-driven individuals to help bring Citizen to hundreds of cities nationwide. Citizen is backed by 8VC, Founders Fund, Goodwater Capital, and Greycroft and has raised $100M in VC funding.

Our Challenges Scaling & Bursting : With thousands of users joining the platform each day, we need to ensure our systems scale to handle expanded load gracefully. On significant events, we see over a million simultaneously connected clients and their associated live streams. Our core systems need to be able to efficiently support these traffic patterns and continue to scale to millions of more users in the future.

Machine learning : We process thousands of hours of audio every day looking for incidents that impact our users' safety. To do this at scale, we've built ML models for audio analysis and targeting using the current state of the art from academia. Analytics : We want to alert users to the incidents that matter to them, in a way that scales across different geographic densities and demographics.

Mobile video streaming : Our app ingests high-quality video at low-latency, transcodes, and redistributes the video to external media outlets seamlessly. Radio hardware : We build our own software-defined radio-based devices to consume all radio dispatch in every major city, whether analog or digital. Our Stack Mobile:

Swift (iOS), Kotlin (Android) Web: React.js, TypeScript Services: Go for transactional systems; Python for analytical systems Datastores:

Cassandra, MySQL, PostgreSQL, BigQuery, Memcached, Redis, Google PubSub Infrastructure: Google Cloud Platform About the Role Design and build systems for scale, modularity, and flexibility without compromising on reliability. Deliver backend systems with an attention to high availability, low latency and scalability.

Build and operate infrastructure, toolset, and deployment pipelines. Take operational responsibility for the services we build. Collaborate closely with a multidisciplinary team that consists of product, design and engineering team members to deliver a consistent experience to our users in real-time.

Demonstrate rigor with code quality, best practices, and code review, while understanding product tradeoffs. Requirements Bachelor's Degree in Computer Science or related field. 5 years engineering experience, focusing primarily on backend development. Experience working with production code using languages such as C++, Go, Java, Python, Scala, etc.

Experience designing and implementing performant APIs on distributed systems Strong knowledge of data design and database systems Nice to Have Knowledge and hands on experience with Video Streaming Services Knowledge, exposure, or hands on experience with ML and related systems Salary Range & Benefits: The below represents the expected salary range for this position in New York, New York. We take a number of factors into account when determining compensation including your location, experience, and other job-related factors.

Salary Range: $175,000 to $210,000 annually equity benefits Citizen is a fully-distributed team that offers a competitive benefits package including medical, dental, vision, flexible spending accounts, paid time off, company holidays, stock options, and various wellness perks. Citizen is proud to be an equal opportunity employer. We provide employment opportunities without regard to age, race, color, ancestry, national origin, religion, disability, sex, gender identity or expression, sexual orientation, veteran status, or any other protected class.