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Jobs · Engineering · California

Staff Software Engineer, Fullstack-MarTech

Flex · San Francisco, CA · 1 wk ago
Engineering$200k–$250k/yrFull-time

Flex is a growth-stage, NYC-headquartered FinTech company creating the best rent payment experience. We enable users to pay rent throughout the month on a schedule that fits their finances and budget. Our mission is to empower renters with flexibility over their most significant recurring expense.

About the role

Flex is looking for a Staff Software Engineer to join our MarTech (Marketing Technology) team. This role involves spearheading the implementation of platforms, services, and customer-facing web experiences that power how Flex finds, wins, and keeps customers. MarTech is the connective layer between our ad platforms, website, messaging systems, analytics, and product data. We turn marketing spend into a measurable, repeatable growth engine and enable marketing to launch, test, and personalize campaigns without hand-built engineering each time.

The team owns growth engineering end-to-end across:

  • Lifecycle Marketing (email & SMS)
  • Performance Marketing (paid acquisition)
  • Brand (social and every getflex.com property)
  • Product Marketing

Projects and systems in MarTech you’ll work on include:

  • Incentive platform — event-driven credit assignment for referrals, affiliates, and campaigns
  • Attribution and measurement — conversion APIs, identity resolution, and spend/event pipelines behind acquisition cost reporting
  • Customer-facing web — the full getflex.com surface area and paid-acquisition landing pages
  • Lifecycle messaging — campaign orchestration, audience syncs, and event-driven notifications

Responsibilities

  • Build and own full-stack marketing services and web experiences that drive customer acquisition and retention
  • Design and develop 24/7 high-scale APIs, event-driven services, and data pipelines (AWS stack: Java/Spring Boot backend; TypeScript/React frontend)
  • Build measurement into everything we ship, and integrate third-party ad, analytics, and messaging platforms behind durable abstractions
  • Work closely with marketing, data, product, design, and engineering peers to launch features and experiments across web and mobile

Requirements

Minimum Qualifications

  • 8+ years of professional software development experience
  • 6+ years of hands-on experience with Java
  • 3+ years of experience with TypeScript
  • 3+ years of experience with React (or React Native), including modern architectures and tooling (Hooks, Components, Context, state management)
  • Excellent written and verbal communication skills, with experience in cross-functional collaboration — especially translating between marketing goals and engineering tradeoffs
  • Proven experience building high-quality, high-performance web and mobile UIs to spec — including responsive, SEO-conscious, conversion-optimized pages
  • Proficient in Java frameworks and tools used at Flex, including Spring (core/web/boot), Gradle, JUnit, and JVM (memory/performance tuning, GC)
  • Experience with service-oriented architecture, REST APIs, webhooks, message queues, event-driven design, and scalable architectures
  • Experience with AWS (EKS, Aurora RDS, Elasticache, DynamoDB) and containerization tools
  • Comfort integrating and debugging third-party APIs and SDKs where you don’t control the contract, including rate limits, partial failures, and reconciliation

Preferred Qualifications

  • Experience on a growth, marketing engineering, or MarTech team
  • Hands-on experience with platforms such as Braze, Singular/AppsFlyer/Branch, Google Tag Manager, Amplitude, LaunchDarkly, or Meta/Google/TikTok/Apple ad and conversion APIs
  • Familiarity with attribution, identity resolution, and conversion tracking, and the privacy constraints they operate under (consent management, state privacy laws, platform tracking restrictions)
  • Experience with A/B testing and experimentation frameworks, web performance optimization, and headless/CMS content tooling
  • Experience with big data platforms and tooling, including Snowflake
  • Proficient in CI/CD systems (preferably GitHub Actions), git, and automation; observability tools such as DataDog; and Infrastructure as Code using CDK or Terraform
  • Skilled at elevating team standards through best practices and mentoring junior engineers

Pay

Flex takes a market-based approach to pay, with compensation varying by primary work location. Work locations are categorized into tiers based on cost of labor:

  • Tier 1 (NYC/Bay Area, Los Angeles, Seattle): $200,000—$250,000 USD
  • Tier 2 (Austin, Washington D.C., Philadelphia, San Diego, Chicago, Atlanta): $180,000—$225,000 USD
  • Tier 3 (Salt Lake City, all other USA cities): $170,000—$212,000 USD

Schedule

  • Roles posted in New York, San Francisco, and Salt Lake City are hybrid positions with on-site expectations of 2-3 days per week
  • For candidates outside these areas, relocation assistance may be available

Benefits

For full-time U.S. employees:

  • Competitive medical, dental, and vision coverage
  • Company equity
  • 401(k) plan with company match
  • Unlimited paid time off + 13 company paid holidays
  • Parental leave
  • Free Flex subscription

For full-time non-U.S. employees:

  • Competitive compensation + company equity
  • Unlimited PTO

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