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Whatnot

Software Engineer, Ads

Whatnot

. Build ads products across the full ads stack, including bidding and targeting, ranking/auction, serving, campaign management, and seller tooling .

Posted 9/17/2026full-timeKraków • PolandMid-LevelSeniorWebsite

Core Competencies

Role fit
Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates expertise in building and operating scalable backend systems, with a strong focus on product decision-making and cross-functional collaboration. Capable of analyzing system performance and translating ambiguous problems into actionable technical plans.

Highest-signal resume keywords
Backend Systems DevelopmentScalable System DesignProduct Decision-MakingCross-Functional CollaborationData Analysis

ATS Keywords

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Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills
Software EngineeringSystem Behavior AnalysisBidding and TargetingCampaign ManagementSeller ToolingPerformance EvaluationTechnical JudgmentMaintainable Backend ServicesProduct-Minded EngineeringProduction Environments
Soft Skills
Strong CommunicationCollaboration Skills
Certifications & Qualifications
Bachelor’s Degree in Computer Science
Industry Keywords
Online AdvertisingAds ProductsFast-Moving EnvironmentsCross-Functional Teams

About the role

Key responsibilities & impact
  • Build ads products across the full ads stack, including bidding and targeting, ranking/auction, serving, campaign management, and seller tooling
  • Build highly scalable advertising systems supporting online advertising and helping sellers differentiate themselves on Whatnot
  • Analyze data, logging, and system behavior to evaluate performance, correctness, and impact
  • Understand buyer and seller experiences and help them scale their businesses through ads products
  • Own problems end to end and grow into new areas as the team scales
  • Make sound product decisions, prioritize high-impact features, and ship high-quality products quickly
  • Collaborate across engineering, product, design, and data

Requirements

What you’ll need
  • Bachelor’s degree in Computer Science, a related field, or equivalent practical experience
  • 4+ years of professional software engineering experience building and shipping backend systems in production environments
  • Strong experience designing, building, and operating scalable, maintainable backend services
  • Strong technical judgment and ability to make thoughtful tradeoffs between speed, quality, reliability, and long-term maintainability
  • Experience working in fast-moving, cross-functional product or platform environments
  • Comfort owning ambiguous problem spaces and turning them into clear technical plans and shipped outcomes
  • Strong communication and collaboration skills across engineering, product, design, and data
  • Product-minded approach to engineering
  • Legally authorized to work in Poland

Benefits

Comp & perks
  • Remote work arrangement
  • In-person onboarding experience at one of the company's offices
  • Video interview alternative arrangements available upon request