Zefr
Marketing Services
Zefr is helping power the age of responsible marketing by enabling transparent, content-level targeting and measurement across the walled garden platforms.
Hiring now
Is Zefr hiring?
Yes. As of November 4, 2026, Zefr has 7 open roles on Metaintro. 6 were posted in the last 30 days.
Open roles
Newest first. Pay shown when the posting lists it.
- Multilingual Data Annotation Specialist, SpanishQuality AssuranceMarina del Rey, California, United States · Hybrid · $72.4K/yrMarina del Rey, California, United StatesHybrid$72.4K/yr3d ago
- Multilingual Data Annotation Specialist, HindiQuality AssuranceMarina del Rey, California, United States · Hybrid · $72.4K/yrMarina del Rey, California, United StatesHybrid$72.4K/yr3d ago
- Software EngineerDeveloperMarina del Rey, California, United States · Hybrid · $100K – $130K/yrMarina del Rey, California, United StatesHybrid$100K – $130K/yr6d ago
- Customer Success ManagerCustomer SupportNew York, New York, United States +1 · Hybrid · $90K – $110K/yrNew York, New York, United States +1Hybrid$90K – $110K/yr16d ago
- Software Development Engineer in Test (SDET)QA Testing AutomationMarina del Rey, California, United States · Hybrid · $90K – $120K/yrMarina del Rey, California, United StatesHybrid$90K – $120K/yr23d ago
- Site Reliability EngineerDevOpsMarina del Rey, California, United States · Hybrid · $100K – $130K/yrMarina del Rey, California, United StatesHybrid$100K – $130K/yr29d ago
- Senior Software EngineerDeveloperMarina del Rey, California, United States · Hybrid · $180K – $200K/yrMarina del Rey, California, United StatesHybrid$180K – $200K/yrJul 23, 2026
Hiring pattern
How fast Zefr is adding roles, and how they're set up.
New roles each monthRoles first posted in the month
How roles are set upShare of open roles
Customers
All 12 companies Zefr names as customers.
Customers hiring now4
- Marks & Spencer4,192 open roles
- Telefónica214 open roles
- Mazda121 open roles
- CMI Media Group36 open roles
Case studies6
- Waitrose
- Movistar Telefónica Hispam
- Sony Pictures Entertainment
- Rexona
- McCain Foods
- Adidas
Other customers2
- Tuenti Equador
- Telefónica S.A.
What their customers say
Quotes from people at Zefr's customers.
“Leveraging Zefr’s Brand Suitability Data for Meta’s Advantage+ shopping campaign exceeded our performance expectations. We achieved higher ROAS and acquired new customers without compromising on brand safety and suitability. Testing Meta’s new product, ASC and incorporating Zefr’s Allow Lists for FAN is a proven successful strategy, and we look forward to continuing our partnership in the future.”
“We wanted to take our social campaigns to the next level, leaving the traditional behind. With Zefr, we were able to combine brand safety and media quality, which translated into better results, greater efficiency and a more robust advertising experience.”
“I applaud the excellent partnership we had with Zefr and our agency to identify brand suitable opportunities that improved our digital strategy. Brand suitability is without a doubt one of the most important KPIs we cannot neglect.”
“We value the partnership with Zefr that allowed CMI Media Group to implement the first-ever 3rd party brand safety measurement on Meta for a pharma campaign, resulting in actionable insights that drove campaign goals.”
AI launches and partners
What Zefr has launched and who it works with on AI.
- ResearchZefr LabsZefr Labs is Zefr’s innovation arm building intelligence brands will need for what's next, including how they show up in AI and emerging platforms.
- LaunchEnd-to-End AI DevelopmentZefr designs, builds, and scales AI solutions across the full lifecycle.
- LaunchResponsible AIResponsible AI prioritizes transparency, bias mitigation, and thoughtful risk management at every stage.
- LaunchAgentic AITailored AI agents drive faster innovation through rapid rollout and flexible, scalable frameworks.
Interviews
How Zefr describes its hiring process.
“Interviewing with Zefr? We’re excited to spend some time getting to know you!”
Skills they ask for
Most frequent across open postings.
Most requested skills
- SQL
- Python
- Google Workspace
Tech stack
- Analytics
- Google Analytics 4
- Libraries
- Alpine.js
- Security
- Termly
Company facts
Roles by location
Where Zefr is hiring. Pick a city to see its roles.
Similar companies
Companies in the same industry as Zefr that are hiring now.
Questions about Zefr
- Is Zefr hiring?
- Yes. As of November 4, 2026, Zefr has 7 open roles on Metaintro. 6 were posted in the last 30 days. The most are in Developer (2), Quality Assurance (2), and Customer Support (1).
- Where is Zefr hiring?
- Zefr is hiring in Marina del Rey, Chicago, and New York, with the most open roles in Marina del Rey.
- Does Zefr offer remote or hybrid work?
- 88% of open roles are hybrid and 12% are remote.
- What is the interview process at Zefr?
- Zefr describes it this way: “Interviewing with Zefr? We’re excited to spend some time getting to know you!”
- Who are Zefr's customers?
- Zefr names 12 customers, including Marks & Spencer, Telefónica, Mazda, CMI Media Group, and Waitrose.