Senior Full Stack Developer / Stack Up

MWDN connects exceptional tech talent with leading companies across Israel, the USA, Great Britain, and Western Europe. Our goal is to ensure our employees have a secure, rewarding experience while working with prestigious international clients.

Why does MWDN rock?

Here’s what you can expect when you join MWDN:

• Security: We carefully vet our clients to minimize risks and ensure reliability and timely payments—no fraud or unpleasant surprises.
• Career support: If a project isn’t the right fit, we support you and actively help find new opportunities that match your skills and career goals.
• Legal assistance: We provide guidance on legal matters, including opening and managing your independent contractor or sole proprietorship status, taxes, and related processes.
• Professional development: We offer English courses and professional growth opportunities, as well as team-building events.

Why choose us? MWDN is ranked among the top 5 IT employers in our region according to DOU. We take pride in our transparency and strong commitment to our team. Curious to learn more? See what our employees say about working with us on DOU.

What is your new project?

A fast‑growing ad‑tech company building next‑generation programmatic advertising infrastructure. The team focuses on high‑performance systems, real‑time bidding, and AI‑driven optimization. The environment is fast, product‑focused, and highly collaborative, with strong engineering leadership and a culture of ownership.

What makes this project exciting?

We're looking for a Senior Full Stack Developer to join our engineering team and help shape the future of programmatic advertising. You'll architect and build high‑performance systems that process millions of ad transactions in real time, while leveraging cutting‑edge AI technologies to optimize outcomes for our partners.

This role sits at the intersection of ad‑tech and AI, working with massive‑scale systems and sub‑millisecond latency requirements. You’ll own the full development lifecycle — from architecture to deployment — collaborating with a modern, high‑performing engineering team.

What makes you a great fit

• 7+ years of professional software development experience
• 3+ years working in programmatic advertising or ad-tech
• Strong proficiency in JavaScript/TypeScript, React, Node.js, and Python
• Hands-on experience with Prebid.js, Prebid Server, or similar header bidding solutions
• Working knowledge of OpenRTB protocol and bid stream mechanics
• Experience integrating with ad servers (Google Ad Manager, custom ad servers) and SSP/DSP platforms
• Understanding of auction dynamics, floor pricing, and yield optimization strategies
• Familiarity with video advertising (VAST, VPAID) and CTV/OTT environments is a plus

Ad-Tech Stack:

• SSP/DSP platforms: Magnite (Rubicon), PubMatic, Index Exchange, Xandr (AppNexus), OpenX, Amazon TAM
• Header bidding: Prebid.js, Prebid Server, Amazon TAM/UAM, Google Open Bidding
• Ad servers: Google Ad Manager (GAM/DFP), custom ad serving solutions
• Protocols: OpenRTB 2.5/2.6, VAST 4.x, VPAID, ads.txt, sellers.json, SupplyChain Object
• Privacy/Consent: TCF 2.2, GPP, CMP integration, GDPR/CCPA compliance Development Stack:
• Frontend: React, TypeScript, Next.js
• Backend: Node.js, Python, FastAPI, Express
• Data: PostgreSQL, Redis, Kafka, ClickHouse
• Infrastructure: AWS, Kubernetes, Terraform, Cloudflare Workers

Nice to Have

• Experience building or contributing to ad server platforms
• Familiarity with AI/ML applications in ad-tech (bid optimization, contextual targeting)
• Background in publisher-side monetization or ad ops
• Experience with mobile advertising SDKs and in-app monetization
• Knowledge of identity solutions (UID2, ID5, LiveRamp) and cookieless targeting

Your day-to-day in this position

• Design and develop full-stack applications for programmatic advertising workflows using React, Node.js, and Python
• Build and maintain integrations with major SSPs (Magnite, PubMatic, Index Exchange, Xandr, OpenX) and DSPs
• Implement and optimize Prebid.js and Prebid Server configurations for header bidding
• Develop OpenRTB-compliant bid request/response handling and auction logic
• Build ad serving infrastructure including VAST/VPAID video ad implementations
• Create publisher-facing dashboards for yield management, analytics, and reporting
• Implement ads.txt, sellers.json, and supply chain transparency tools
• Ensure compliance with privacy frameworks (GDPR, CCPA, TCF 2.2) and consent management
• Collaborate with product, partnerships, and data teams to deliver end-to-end solutions

Why work with us?

• People-first management with minimal bureaucracy
• A friendly company culture, proven by employees who choose to return
• Flexible working hours
• 29 days of PTO (18 working days per year pluse all national holidays)
• 10 paid sick days
• Full financial and legal support for independent contractors
• Free English classes, with native speakers or Ukrainian teachers
• Dedicated HR support

Our next steps

✅ Intro with the client — ✅ Tech interview — ✅ Home assignment — ✅ Final client interview

Requirements