Senior Engineer, Backend APIs

Senior Engineer — Backend APIs

Los Angeles, CA

New York City, NY

Broomfield, CO

Hybrid Schedule (M/F remote, T/W/TH in-office)

At Magnite, we cultivate an environment of continuous growth and collaboration. Our work impacts what millions of people read, watch, and buy, and we’re looking for people to help us tackle that responsibility with creativity and focus.  Magnite (NASDAQ: MGNI) is the world’s largest independent sell-side advertising platform. Publishers use our technology to monetize their content across all screens and formats including CTV / streaming, online video, display, and audio. Our tech fuels billions of transactions per day!

About this team:

Magnite’s Reporting & Insights group powers our flagship analytics products — Performance Analytics (PA), Prebid Analytics (PBA), and the SpringServe platform's reporting — and is building the next‑generation Unified Reporting API. We’re adding an experienced backend engineer to accelerate a high‑impact roadmap, elevate API developer experience, and partner closely with our UI and Data teams to ship features that our publishers and DSPs rely on to understand and optimize campaign performance.

In this role you will:  

• Design, build, and evolve microservice‑based API products that power reporting and analytics applications. 

• Collaborate daily with Product, UI, and Data engineers to take features end‑to‑end — from requirements and design to rollout, telemetry, and iteration.

• Design and build APIs that are intuitive and easy to consume: clear contracts (OpenAPI/gRPC), well-documented, versioning strategies, pagination, filtering, batching, and strong SLAs/SLOs.

• Shape data access patterns: schemas, query plans, caching, and performance tuning in read/writes for big data.

• Champion code quality: well‑tested, observable, maintainable code; thoughtful reviews; design docs; and pragmatic documentation.

• Own services in production: dashboards, alerting, capacity and load testing, cost‑aware design, and reliability improvements.

• Leverage AI-assisted tools in your development process

We’re looking for someone with: 

• 5+ years of software engineering experience, including 3+ years with Java.

• Deep understanding of microservice fundamentals (service boundaries, resiliency, observability, CI/CD) and API design at scale.

• Primary development experience in Java for high-throughput, low-latency back-end web services. Experience with asynchronous programming patterns, high levels of concurrency, and with frameworks such as Vert.x and Dropwizard is highly desirable.

• Hands-on experience with Postgres (or other RDBMS): modeling, migrations, indexing, and query optimization.

• A track record of shipping well‑tested, production‑grade APIs used by UI applications and direct API consumers.

• Proficiency with Git/GitHub and modern team practices (reviews, trunk/branch strategies, code ownership).

• Clear, empathetic communication and a collaborative mindset.

Our current tech stack:

• Exposure to cloud providers (AWS, GCP, or Azure) and container orchestration (Docker/Kubernetes).

• Familiarity with functional programming concepts.

• Experience with event‑driven or streaming architectures.

• Understanding of authN/Z patterns (OAuth2/JWT), rate limiting, and API security.

• Observability tools and practices (metrics, tracing, logs) and load/perf testing.

• Knowledge of Real-Time Bidding (RTB), SSPs, DSPs, and ad delivery systems is a strong plus.

How we work:

• Hybrid collaboration centered on our Los Angeles office with close partnership to US‑based Product, UI, and Data teams.

• Pragmatic process: design docs, small PRs, automation over toil, and continuous learning.

• A supportive culture that values mentorship, psychological safety, and outcomes over ego.

Perks and Benefits: 

• Comprehensive Healthcare Coverage from Day One

• Generous Time Off  

• Holiday Breaks and Quarterly Wellness Days

• Equity and Employee Stock Purchase Plan

• Family-Focused Benefits and Parental Leave 

• 401k Retirement Savings Plan with Employer Match

• Disability and Life Insurance

• Cell Phone Subsidy

• Fitness and Wellness Reimbursement

Company Culture: 

We believe collaboration is essential to success. Magnite’s hybrid schedule includes two days worked remotely (Monday and Friday) and three days on-site (Tuesday, Wednesday and Thursday). Our offices provide catered lunches, beverages, snacks, training and development, and office events to support your work week. We also understand you have appointments, families, hobbies, and other commitments. Magnite strives to maintain a healthy work/life integration for all employees so you can bring your best every day - both at work and at home.

• Community Service and Volunteer Events

• Company-Matched Charitable Contributions

• Wellness Coach and Mental Health Support

• Career Development Initiatives and a Career Growth Framework

• Culture and Inclusion Programs

• Bonusly Peer-to-Peer Recognition Program

About Us

The world's leading agencies and brands trust our platform to access brand-safe, high-quality ad inventory and execute billions of advertising transactions each month. Anchored in bustling New York City, sunny Los Angeles, mile-high Denver, historic London, and down under in Sydney, Magnite has offices across North America, EMEA, LATAM, and APAC.

Across the US, the base salary range for this position is: $125,000 - $155,000 in addition to an annual variable bonus based on performance and company equity (NASDAQ: MGNI). The pay varies based on location, industry, and technical experience.

For Los Angeles-based applicants: 

Qualified applications with arrest or conviction records will be considered for employment in accordance with the Los Angeles County Fair Chance Ordinance for Employers and the California Fair Chance Act.

The material job duties of this specific job position for which Magnite reasonably believes that a criminal history may have a direct, adverse, and negative relationship include:

• Having access to the Company’s Confidential Information or trade secrets including data related to customers, clients, vendors, business partners, or suppliers 

• Work with cross teams  to access datasets, databases, formulas, algorithms, tools, products, prototypes, systems applications, and technologies in any stage of development 

Magnite is an Equal Opportunity Employer and does not discriminate against applicants due to race, color, religion, national origin, age, sex, marital status, ancestry, physical or mental disability, veteran status, gender identity, sexual orientation or any other federal, state or local protected class.

Our Commitment: We aim to incorporate a wide range of voices into our Magnite culture, cultivating an environment where employees feel welcomed, cared for, and encouraged to freely share ideas. We are committed to employee growth, collaboration, inclusion, and innovation.  We invest in Magnite’s local communities. We seek talent from all backgrounds to champion corporate values of seeing the big picture and being catalysts of change.

Want to learn more about us?  

Check out our blog for Magnite announcements and Ad Tech industry news! 

Recruiting Agency Notice

Magnite does not accept agency resumes and is not responsible for any fees related to unsolicited resumes.