(USA) Senior, Software Engineer

Position Summary...

We are building a first‑party, privacy‑centric advertising platform that unites retail data, smart‑TV inventory, and a growing CTV publisher network. Our mission is to deliver relevant, measurable ad experiences while giving consumers full control of their data. 

What you'll do...

As an Ad Tech Engineer on our CTV team, you will design, build, and scale low‑latency services that power server‑side ad insertion (SSAI), dynamic ad decisioning, and real‑time measurement across millions of smart TVs and OTT devices. You’ll collaborate with product managers, data scientists, privacy engineers, and DSP/SSP partners to create an end‑to‑end stack that bridges broadcast‑quality video with programmatic precision. 

Key Responsibilities 

• Ad Delivery & Decisioning 

• Develop microservices for ad selection, pacing, and frequency capping that handle >100 k QPS under <100 ms p99 latency. 

• Implement VAST 4.x / VAST 4.2, SCTE‑35 cue‑tone parsing, and OpenRTB 2.6 bid request/response logic for CTV.  

• Streaming & SSAI 

• Build and optimize HLS/DASH manifest manipulation and stitched‑segment workflows using AWS MediaTailor, GCP Media CDN, or an in‑house stack. 

• Ensure frame‑accurate ad breaks and seamless transitions across HDR, 4K, and variable‑bitrate profiles. 

• Measurement & Privacy 

• Integrate IAB OM‑SDK‑CTV signals, ACR fingerprints, and privacy‑preserving identifiers (PPIDs, EIDs) to attribute outcomes in real time. 

• Partner with the privacy team to apply differential privacy, on‑device ML models, and clean‑room pipelines (e.g., Secure Multi‑Party Computation) for closed‑loop ROAS measurement. 

• Programmatic Interfaces 

• Build APIs for header‑bidding adapters, Prebid.js/Prebid Server for CTV, and custom RTB auctions supporting deal‑IDs, first‑party audiences, and dynamic floors. 

• Work with supply‑side and demand‑side partners to certify integrations and troubleshoot bid‑stream anomalies. 

• Reliability & Observability 

• Automate rollouts via Kubernetes and GitOps; enforce canary releases and blue/green deployments. 

• Instrument distributed tracing (OpenTelemetry), anomaly detection, and SLA dashboards to guarantee five‑nines uptime during live sports and tent‑pole events. 

• Collaboration & Leadership 

• Translate product requirements into engineering design docs, influence architecture decisions, and mentor junior engineers. 

• Contribute to open‑source Ad Tech projects (Prebid, Video.js, IAB Tech Lab) and represent the company in industry working groups. 
    

About the team: 

Walmarts Advertising Technology group enables the connection between supplier brands and retail shoppers at unprecedented scale. We are a highly motivated group of engineers and data scientists, working in an agile group to solve sophisticated and high impact problems. We serve billions of ad requests every month with our high-performance ad servers. 

 

We build smart data systems that ingest, model, analyze and optimize the massive flow of data from online and store user activity and transactions. We use cutting edge machine learning, data mining and optimization algorithms on this data.  

  

Above all, we are laser focused on delivering experiences that our customers and advertisers love.  

Minimum Qualifications 

• 8+ years of back‑end software development experience (Golang, Java, Kotlin, C++ or Rust) with production services at scale. 

• Deep knowledge of video streaming protocols (HLS, DASH, CMAF) and ad‑serving standards (VAST, VPAID, VMAP, SCTE‑35). 

• Hands‑on experience with programmatic advertising (OpenRTB, header bidding, DSP/SSP APIs) and real‑time bidding pipelines. 

• Proficiency in AWS, GCP, or Azure cloud infrastructure, container orchestration (Kubernetes/EKS/GKE), and CI/CD. 

• Strong grasp of data structures, distributed systems, and performance tuning for millisecond‑level latency. 

• Bachelor’s degree in Computer Science, Electrical Engineering, or equivalent practical experience. 

Preferred Qualifications 

• Prior work on CTV or OTT platforms (Roku, Fire TV, Android TV, Tizen, webOS) and device‑level SDKs. 

• Experience with SSAI vendors (e.g., Yospace, Stream Stitcher) or building in‑house manifest conditioners. 

• Familiarity with privacy‑enhancing tech: Private Set Intersection (PSI), Differential Privacy, Federated Learning. 

• Exposure to data pipelines (Kafka, Flink, Beam) and real‑time analytics (Druid, ClickHouse, BigQuery). 

• Contributions to IAB/IETF standards or open‑source Ad Tech projects. 

• Master’s degree in a technical field.  

Why Join Us? 

• Build a first‑party CTV ad stack from the ground up, touching everything from device firmware to cloud ML pipelines. 

• Impact at scale—your code will reach tens of millions of screens and influence billions in ad spend. 

• Work with a diverse, high‑caliber team of Ad Tech veterans, data scientists, and product visionaries. 

• Competitive compensation, equity, and benefits; flexible hybrid schedule; generous learning & development stipend. 

At Walmart, we offer competitive pay as well as performance-based bonus awards and other great benefits for a happier mind, body, and wallet. Health benefits include medical, vision and dental coverage. Financial benefits include 401(k), stock purchase and company-paid life insurance. Paid time off benefits include PTO (including sick leave), parental leave, family care leave, bereavement, jury duty, and voting. Other benefits include short-term and long-term disability, company discounts, Military Leave Pay, adoption and surrogacy expense reimbursement, and more.

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You will also receive PTO and/or PPTO that can be used for vacation, sick leave, holidays, or other purposes. The amount you receive depends on your job classification and length of employment. It will meet or exceed the requirements of paid sick leave laws, where applicable.

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For information about PTO, see https://one.walmart.com/notices.

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Live Better U is a Walmart-paid education benefit program for full-time and part-time associates in Walmart and Sam's Club facilities. Programs range from high school completion to bachelor's degrees, including English Language Learning and short-form certificates. Tuition, books, and fees are completely paid for by Walmart.

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Eligibility requirements apply to some benefits and may depend on your job classification and length of employment. Benefits are subject to change and may be subject to a specific plan or program terms.

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For information about benefits and eligibility, see One.Walmart.

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The annual salary range for this position is $117,000.00-$234,000.00

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Additional compensation includes annual or quarterly performance bonuses.

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Additional compensation for certain positions may also include:

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- Stock

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Minimum Qualifications...

Outlined below are the required minimum qualifications for this position. If none are listed, there are no minimum qualifications.

Option 1: Bachelor's degree in computer science, computer engineering, computer information systems, software engineering, or related area and 3 years’ experience in software engineering or related area.Option 2: 5 years’ experience in software engineering or related area.

Preferred Qualifications...

Outlined below are the optional preferred qualifications for this position. If none are listed, there are no preferred qualifications.

Master’s degree in Computer Science, Computer Engineering, Computer Information Systems, Software Engineering, or related area and 1 year's experience in software engineering or related area., We value candidates with a background in creating inclusive digital experiences, demonstrating knowledge in implementing Web Content Accessibility Guidelines (WCAG) 2.2 AA standards, assistive technologies, and integrating digital accessibility seamlessly. The ideal candidate would have knowledge of accessibility best practices and join us as we continue to create accessible products and services following Walmart’s accessibility standards and guidelines for supporting an inclusive culture.

Primary Location...

680 West California Avenue, Sunnyvale, CA 94086-4834, United States of America