Senior Engineer — Backend APIs (Java)

Senior  Engineer — Backend APIs (Java)

New York City, NY

Boston, MA

Los Angeles, CA

Denver, CO

Seattle, WA

San Francisco, CA

Remote - Approved States Listed Below

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 a senior 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.

• Mentor teammates, share knowledge, and help raise the technical bar across the organization.

We’re looking for someone with: 

• 5+ years of software engineering experience, including 2+ years with Java.

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

• Hands-on experience with MySQL (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.

Nice to Have: 

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

• Experience with event‑driven or streaming architectures.

• Experience with frameworks like Vert.x to build non-blocking, event-driven systems.

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

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

• Experience working with distributed/remote teams.

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

• Experience with Terraform.

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 collabor