Full-Time

Multilingual Data Annotation Specialist

Zefr

Zefr

201-500 employees

Contextual video advertising platform with privacy

Compensation Overview

$70.5k/yr

Chicago, IL, USA + 2 more

More locations: New York, NY, USA | Marina Del Rey, CA, USA

Hybrid

Two to three days on-site per week are required at the Marina del Rey office.

Category
Data & Analytics
Required Skills
Claude
SQL
Machine Learning
Quality Assurance (QA)
Google Workspace
Computer Vision

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Requirements
  • Fluency in English and Hindi is required.
  • Professional experience in annotation, content moderation, labeling, quality assurance, policy enforcement, or a related area is required.
  • Strong cultural fluency and the ability to interpret contextual nuance across varied content types are required.
  • Familiarity with major social media platforms, including TikTok, YouTube, Facebook, Instagram, and Snapchat, is required.
  • Exceptional attention to detail and the ability to perform repetitive tasks consistently and accurately are required.
  • Strong written communication skills are required, particularly for explaining ambiguity, inconsistencies, or definitional drift.
  • The ability to apply style guides and enforce consistency across diverse content formats is required.
  • Experience using artificial intelligence tools such as Claude, Gemini, ChatGPT, or similar technologies is required.
  • Proficiency with Google Workspace applications is required.
  • The ability to work with sensitive content, including political topics, religious perspectives, violence, and adult material, is required.
  • The ability to handle confidential and proprietary information appropriately and exercise sound judgment is required.
  • The ability to work two to three days per week in the Marina del Rey office on a hybrid schedule is required.
Responsibilities
  • Use internal tools to label social media content according to Zefr’s contextual category guidelines.
  • Conduct daily annotation and quality evaluation across video, image, and metadata formats.
  • Apply cognitive and cultural nuance when making judgment calls on complex or sensitive content.
  • Interpret, apply, and help refine labeling frameworks and documentation.
  • Identify emerging trends and edge cases and surface potential issues to stakeholders.
  • Conduct root-cause analyses to identify opportunities for improving content quality.
  • Provide insights on content patterns and contribute to enhancements of the labeling interface.
  • Generate weekly reports with findings and quality recommendations.
  • Perform quality assurance across multiple project pipelines.
  • Maintain up-to-date knowledge of Zefr policies and proactively suggest optimization opportunities.
  • Develop foundational knowledge of machine learning concepts and how high-quality annotation data supports artificial intelligence systems.
Desired Qualifications
  • Fluency in Spanish, Mandarin, Turkish, Tagalog, or other additional languages is a plus.
  • Familiarity with SQL is a plus.

Zefr provides privacy-friendly contextual advertising, focusing on placing ads alongside video content on platforms like YouTube and Facebook without using personal data. Its Contextual Data Management Platform captures and organizes brands’ preferences to activate targeted campaigns with pre-flight targeting and impression-level transparency. The product works by analyzing contextual signals to ensure ads appear next to content aligned with a brand’s values, delivering customized video-level targeting that aims to boost metrics such as view-through rates, aided awareness, and brand favorability. Compared with competitors, Zefr emphasizes privacy compliance and transparent targeting, offering dynamic, video-focused solutions that optimize ad performance while respecting user privacy. The goal is to help brands reach the right audiences in a privacy-safe way and achieve a stronger return on investment for their video campaigns.

Company Size

201-500

Company Stage

Series E

Total Funding

$65.1M

Headquarters

Los Angeles, California

Founded

2009

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Simplify Jobs

Simplify's Take

What believers are saying

  • May 18, 2026 Threads Feed expansion broadens Zefr across Meta's fastest-growing inventory.
  • August 6, 2026 Opti tackles Demand Gen and Performance Max spend as YouTube shifts.
  • July 14, 2026 Türkiye, GCC, and Egypt partnerships open new agency channels and regional demand.

What critics are saying

  • Google and Meta can internalize suitability tooling, compressing Zefr's moat by 2027.
  • YouTube's August 17, 2026 auction changes expose Zefr to policy-driven product obsolescence.
  • Zefr still depends on platform APIs and partner access; one restriction can cripple activation.

What makes Zefr unique

  • MRC-accredited YouTube content-level brand safety makes Zefr unusually trusted in walled gardens.
  • Zain and AdCP let advertisers launch YouTube, TikTok, and Meta buys in one workflow.
  • Zefr combines AI frame-level analysis with human review, targeting culturally sensitive content across regions.

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Benefits

Flexible Paid Time Off

Medical, dental, and vision insurance with FSA options

Company-paid life insurance

Paid parental leave

401(k) with company match

Professional development opportunities

14 paid holidays off

Flexible hybrid work schedules

Summer Fridays

In-office lunches and lots of free food

Optional in-person and virtual events (we like to celebrate!)

Growth & Insights and Company News

Headcount

6 month growth

1%

1 year growth

1%

2 year growth

1%
MarTech Vibe
Aug 10th, 2026
Zefr announces the launch of Opti.

Zefr announces the launch of Opti. Opti is designed to help advertisers running lower-funnel and conversion-focused campaigns minimise potential bidding friction and cost inflation as auction dynamics evolve. Zefr, a company in AI-powered responsibility across walled gardens, has announced the launch of Opti, a new solution designed to help brands maintain control over media costs while maximising the performance of YouTube Demand Gen and Performance Max campaigns. Opti arrives ahead of YouTube's August 17 changes to target bid optimisation. It is designed to help advertisers running lower-funnel and conversion-focused campaigns minimise potential bidding friction and cost inflation as auction dynamics evolve. "YouTube is successfully moving down the funnel for advertisers, and Demand Gen and Performance Max are critical parts of the performance mix," said Jonathan Berke, Senior Vice President, Platform Development, Zefr. "With Opti, advertisers can continue to take advantage of these campaign types while managing the potential impact of changing auction dynamics on efficiency." As marketers place greater emphasis on performance and return on investment, YouTube has evolved from primarily a TV alternative into a powerful performance engine. Demand Gen and Performance Max campaigns are central to that evolution, helping advertisers generate measurable results across the customer journey. Zefr's brand suitability intelligence has already helped advertisers confidently expand their investment across YouTube. Opti builds on that foundation by bringing greater control and confidence to advertisers' bidding strategies as the platform's auction model changes. As a privately held AI company focused on maximising advertising effectiveness within walled gardens, Zefr developed Opti in direct response to Google's recent update to target bid optimisation. Sophia Bennett is a news curator at Martechvibe, covering global developments across marketing technology, digital transformation, AI, data, and customer experience trends. View More

Yahoo Finance
Aug 6th, 2026
Zefr launches Opti to help advertisers optimize YouTube Demand Gen and Performance Max campaigns

Zefr has launched Opti, a solution designed to help brands control media costs whilst maximising performance of YouTube Demand Gen and Performance Max campaigns. The launch precedes YouTube's 17 August changes to target bid optimisation. Opti aims to help advertisers running lower-funnel and conversion-focused campaigns minimise potential bidding friction and cost inflation as auction dynamics evolve. The tool brings greater control to advertisers' bidding strategies as YouTube's auction model changes. "YouTube is successfully moving down the funnel for advertisers, and Demand Gen and Performance Max are critical parts of the performance mix," said Jonathan Berke, senior vice president of platform development at Zefr. Opti is available immediately to all Zefr customers worldwide for YouTube activations.

9iMedia Networks
Jul 14th, 2026
Zefr expands strategic partner network across Türkiye, GCC and Egypt with Black C Media and RedC Media.

Zefr expands strategic partner network across Türkiye, GCC and Egypt with Black C Media and RedC Media. Partnership brings AI-powered cross-platform content intelligence, brand safety and suitability solutions to regional advertisers and agencies. Zefr, the leading provider of AI-powered brand safety and suitability solutions for walled garden environments, today announced strategic partnerships with Black C Media and RedC Media to expand support for advertisers and agencies across Türkiye, the Gulf Cooperation Council (GCC) and Egypt. Under the partnership, Black C Media will serve as Zefr's official partner in Türkiye, while RedC Media will support the GCC region, including Saudi Arabia, the United Arab Emirates, Qatar, Kuwait, Bahrain and Oman, as well as Egypt. The partnership combines Zefr's AI-powered technology with Black C Media and RedC Media's local market expertise, agency relationships and hands-on activation support. Together, the companies will give advertisers and agencies an additional way to access Zefr's contextual, brand safety and suitability capabilities on YouTube, supported by local sales, campaign activation, strategic guidance tailored to regional market dynamics and languages including Turkish, Arabic and English, and managed service support where needed. "Türkiye, GCC and Egypt are not only fast-growing digital markets, they are culturally rich and highly nuanced regions where local context and cultural sensitivity are everything. We are proud to partner with Black C Media and RedC Media to bring Zefr's patented content intelligence to advertisers and agencies in the region. Together, we're enabling brands to activate on YouTube and across social platforms with a video-level precision and relevance so every dollar works harder," said Alexandra Kondrashtina, MENA Commercial Lead at Zefr. "In Türkiye, brands' sensitivity to high-risk and unsafe content has never been higher, and YouTube - where thousands of videos are uploaded every day - is the country's largest media platform. "Zefr's suitability layer, which processes every frame with AI, finds the most relevant context for each brand within this massive content flow while helping brands avoid unsuitable or high-risk ad environments. Thetimesofuae at Black C Media are proud to bring this new capability to the Turkish advertising market. "From now on, brands on YouTube will be able to reach their audiences at the right moment and in the right context - while helping direct investment toward quality content and creators," said Cengiz Coşkun, Managing Director, Black C Media - Türkiye. "In the GCC, where YouTube consumption is exceptional - users spend more than 60 minutes daily with a penetration of 94%+ - however, scale alone is not enough. In today's complex social media environment filled with controversial & misinformative content, brands need quality scale - placements that protect suitability, build affinity, and drive real ROI. "At Red C, we are proud to partner with Zefr, to help GCC brands deliver ads in brand safe and suitable environments, ensuring every social media impression delivers real measurable business outcomes," said Taher Jawadwala, Country Manager, Red C Media. Zefr's platform helps advertisers bring greater precision to video and social media buying by combining contextual targeting, brand safety, suitability, measurement and optimization in one solution. On YouTube, Zefr is the first third-party platform integration to receive Media Rating Council (MRC) accreditation for content-level brand safety and suitability labeling and reporting, reinforcing its ability to help brands assess media quality at the individual content level rather than relying only on broad channel or property-level classifications. The company works with many of the world's leading brands helping them better understand where their ads appear, identify the content most relevant to their message, and reduce wasted impressions across unsuitable or low-quality environments.

TradingView
Jul 14th, 2026
ZAWYA: Zefr expands strategic partner network across Türkiye, GCC and Egypt with Black C Media and RedC Media.

ZAWYA: Zefr expands strategic partner network across Türkiye, GCC and Egypt with Black C Media and RedC Media. LOS ANGELES-(BUSINESS WIRE/AETOSWire)- Zefr, the leading provider of AI-powered brand safety and suitability solutions for walled garden environments, today announced strategic partnerships with Black C Media and RedC Media to expand support for advertisers and agencies across Türkiye, the Gulf Cooperation Council (GCC) and Egypt. Under the partnership, Black C Media will serve as Zefr's official partner in Türkiye, while RedC Media will support the GCC region, including Saudi Arabia, the United Arab Emirates, Qatar, Kuwait, Bahrain and Oman, as well as Egypt. The partnership combines Zefr's AI-powered technology with Black C Media and RedC Media's local market expertise, agency relationships and hands-on activation support. Together, the companies will give advertisers and agencies an additional way to access Zefr's contextual, brand safety and suitability capabilities on YouTube, supported by local sales, campaign activation, strategic guidance tailored to regional market dynamics and languages including Turkish, Arabic and English, and managed service support where needed. "Türkiye, GCC and Egypt are not only fast-growing digital markets, they are culturally rich and highly nuanced regions where local context and cultural sensitivity are everything. We are proud to partner with Black C Media and RedC Media to bring Zefr's patented content intelligence to advertisers and agencies in the region. Together, we're enabling brands to activate on YouTube and across social platforms with a video-level precision and relevance so every dollar works harder," said Alexandra Kondrashtina, MENA Commercial Lead at Zefr. "In Türkiye, brands' sensitivity to high-risk and unsafe content has never been higher, and YouTube - where thousands of videos are uploaded every day - is the country's largest media platform. "Zefr's suitability layer, which processes every frame with AI, finds the most relevant context for each brand within this massive content flow while helping brands avoid unsuitable or high-risk ad environments. We at Black C Media are proud to bring this new capability to the Turkish advertising market. "From now on, brands on YouTube will be able to reach their audiences at the right moment and in the right context - while helping direct investment toward quality content and creators," said Cengiz Coşkun, Managing Director, Black C Media - Türkiye. "In the GCC, where YouTube consumption is exceptional - users spend more than 60 minutes daily with a penetration of 94%+ - however, scale alone is not enough. In today's complex social media environment filled with controversial & misinformative content, brands need quality scale - placements that protect suitability, build affinity, and drive real ROI. "At Red C, we are proud to partner with Zefr, to help GCC brands deliver ads in brand safe and suitable environments, ensuring every social media impression delivers real measurable business outcomes," said Taher Jawadwala, Country Manager, Red C Media. Zefr's platform helps advertisers bring greater precision to video and social media buying by combining contextual targeting, brand safety, suitability, measurement and optimization in one solution. On YouTube, Zefr is the first third-party platform integration to receive Media Rating Council (MRC) accreditation for content-level brand safety and suitability labeling and reporting, reinforcing its ability to help brands assess media quality at the individual content level rather than relying only on broad channel or property-level classifications. The company works with many of the world's leading brands helping them better understand where their ads appear, identify the content most relevant to their message, and reduce wasted impressions across unsuitable or low-quality environments. About Zefr Zefr is the leader in AI-powered content classifications for brands and advertisers. Zefr's platform is purpose built for multi-modal content understanding on open platforms like YouTube, TikTok, Meta and Snap, with pre-bid activation and verification solutions. Our products safeguard media and AI investments, while maximizing performance and efficacy on those channels. Headquartered in Los Angeles with global offices across New York, Chicago, London, Toronto, Singapore, and more, Zefr is redefining what trust and transparency means for social media in the age of AI. To learn more, visit zefr.com. View source version on businesswire.com: https://www.businesswire.com/news/home/20260707124119/en/ *Source: AETOSWire Contacts Media Contacts: Zefr: Cassady Nordeen [email protected] Send us your press releases to [email protected] Disclaimer: The contents of this press release was provided from an external third party provider. This website is not responsible for, and does not control, such external content. This content is provided on an "as is" and "as available" basis and has not been edited in any way. Neither this website nor our affiliates guarantee the accuracy of or endorse the views or opinions expressed in this press release. The press release is provided for informational purposes only. 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Affinity Group Publishing (AGP)
Jul 13th, 2026
Strategus appoints Elisa Crutchfield Vice President of Marketing.

Strategus appoints Elisa Crutchfield Vice President of Marketing. DENVER, July 13, 2026 (GLOBE NEWSWIRE) - Strategus today announced the appointment of Elisa Crutchfield as Vice President of Marketing. In this role, Crutchfield will lead Strategus' marketing function across brand, communications, demand generation, customer growth, and market positioning, shaping the company's story and presence as it enters its next phase of growth. She will deepen engagement with customers and partners across the business. Crutchfield will report directly to CEO Todd Porch. She brings more than 11 years of marketing leadership experience scaling B2B technology brands. Crutchfield joins Strategus from Zefr, the global AI technology company specializing in brand safety and suitability for social platforms, where she most recently served as Vice President, Head of Marketing & Strategy. Over an eight-year tenure marked by five promotions, she built and led the company's global marketing organization, with depth spanning demand generation, product marketing, events, and integrated communications. Crutchfield joins Strategus as the company strengthens its market narrative around the insights, strategy, and results clients value most. "Elisa is exactly the kind of leader we want to add as Strategus continues to grow," said Todd Porch, CEO of Strategus. "She brings the strategic mindset, leadership presence, and marketing expertise to help us sharpen our story, strengthen our brand, and accelerate growth." Adding Elisa to the leadership team is part of Strategus' continued investment in top talent and in building a stronger, more differentiated business for clients, partners, and employees. About Strategus Strategus helps brands and agencies drive measurable business outcomes through data-driven strategy, cross-channel media, and transparent reporting across every screen. From CTV and online video to display, streaming audio, and digital out-of-home, Strategus aligns every channel around the business results that matter most. Legal Disclaimer: EIN Presswire provides this news content "as is" without warranty of any kind. We do not accept any responsibility or liability for the accuracy, content, images, videos, licenses, completeness, legality, or reliability of the information contained in this article. If you have any complaints or copyright issues related to this article, kindly contact the author above.