<div class="content-intro"><p>Flex is a growth-stage, NYC headquartered FinTech company that is creating the best rent payment experience. It’s hard to believe that it’s 2026 and paying rent on time is expensive, inflexible, and difficult. We’re here to change that! Flex enables our users to pay rent throughout the month on a schedule that better fits their finances and budget. Our mission is to empower as many renters as possible with flexibility over their most significant recurring expense. After deliberately keeping a stealth profile as we built up unprecedented investor support and an enthusiastic user base, we are looking for motivated individuals to help us keep our mission growing. Will you be a part of the team?</p></div><p class="font-claude-response-body break-words whitespace-normal"><strong>About the role</strong></p>
<p class="font-claude-response-body break-words whitespace-normal">Flex is looking for a Staff Software Engineer to join our MarTech (Marketing Technology) team. This role involves spearheading the implementation of the platforms, services, and customer-facing web experiences that power how Flex finds, wins, and keeps customers.</p>
<p class="font-claude-response-body break-words whitespace-normal">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 give marketing the ability to launch, test, and personalize campaigns without hand-built engineering each time. It's a team with a broad surface area, owning growth engineering end to end across Lifecycle Marketing (email & SMS), Performance Marketing (paid acquisition), Brand (social and every getflex.com property), and Product Marketing.</p>
<p class="font-claude-response-body break-words whitespace-normal"><strong>Here are some of the projects and systems in MarTech you'll have opportunities to work on:</strong></p>
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<li class="font-claude-response-body whitespace-normal break-words pl-2">Incentive platform — event-driven credit assignment for referrals, affiliates, and campaigns.</li>
<li class="font-claude-response-body whitespace-normal break-words pl-2">Attribution and measurement — conversion APIs, identity resolution, and spend/event pipelines behind our acquisition cost reporting.</li>
<li class="font-claude-response-body whitespace-normal break-words pl-2">Customer-facing web — the full getflex.com surface area and paid-acquisition landing pages.</li>
<li class="font-claude-response-body whitespace-normal break-words pl-2">Lifecycle messaging — campaign orchestration, audience syncs, and event-driven notifications.</li>
</ul>
<p class="font-claude-response-body break-words whitespace-normal"><strong>What you'll do</strong></p>
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<li class="font-claude-response-body whitespace-normal break-words pl-2">Build and own full-stack marketing services and web experiences that drive customer acquisition and retention.</li>
<li class="font-claude-response-body whitespace-normal break-words pl-2">Design and develop 24/7 high-scale APIs, event-driven services, and data pipelines. Our stack runs on AWS: Java and Spring Boot for the existing backend code base; TypeScript and React for web.</li>
<li class="font-claude-response-body whitespace-normal break-words pl-2">Build measurement into everything we ship, and integrate third-party ad, analytics, and messaging platforms behind durable abstractions.</li>
<li class="font-claude-response-body whitespace-normal break-words pl-2">Work closely with marketing, data, product, design, and engineering peers to launch features and experiments across web and mobile.</li>
</ul>
<p class="font-claude-response-body break-words whitespace-normal"><strong>Qualifications</strong></p>
<p class="font-claude-response-body break-words whitespace-normal"><em>Minimum Qualifications</em></p>
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<li class="font-claude-response-body whitespace-normal break-words pl-2"><strong>8+ years</strong> of professional software development experience.</li>
<li class="font-claude-response-body whitespace-normal break-words pl-2"><strong>6+ years </strong>of hands-on experience with Java.</li>
<li class="font-claude-response-body whitespace-normal break-words pl-2"><strong>3+ years</strong> of experience with TypeScript.</li>
<li class="font-claude-response-body whitespace-normal break-words pl-2"><strong>3+ years</strong> of experience with React (or React Native), including modern architectures and tooling in the React ecosystem (Hooks, Components, Context, state management).</li>
<li class="font-claude-response-body whitespace-normal break-words pl-2"><strong>Excellent written and verbal communication skills, with experience in cross-functional collaboration </strong>— especially translating between marketing goals and engineering tradeoffs.</li>
<li class="font-claude-response-body whitespace-normal break-words pl-2"><strong>Proven experience </strong>building high-quality, high-performance <strong>web and mobile UIs </strong>to spec — including responsive, SEO-conscious, conversion-optimized pages.</li>
<li class="font-claude-response-body whitespace-normal break-words pl-2">Proficient in Java frameworks and tools used at Flex, including Spring (core/web/boot), Gradle, JUnit, and JVM (memory/performance tuning, GC).</li>
<li class="font-claude-response-body whitespace-normal break-words pl-2">Experience with service-oriented architecture, REST APIs, webhooks, message queues, event-driven design, and scalable architectures.</li>
<li class="font-claude-response-body whitespace-normal break-words pl-2">Experience with AWS (EKS, Aurora RDS, Elasticache, DynamoDB) and containerization tools.</li>
<li class="font-claude-response-body whitespace-normal break-words pl-2">Comfort integrating and debugging third-party APIs and SDKs where you don't control the contract, including rate limits, partial failures, and reconciliation.</li>
</ul>
<p class="font-claude-response-body break-words whitespace-normal"><em>Preferred Qualifications</em></p>
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<li class="font-claude-response-body whitespace-normal break-words pl-2">Experience on a growth, marketing engineering, or MarTech team.</li>
<li class="font-claude-response-body whitespace-normal break-words pl-2">Hands-on experience with platforms such as Braze, Singular/AppsFlyer/Branch, Google Tag Manager, Amplitude, LaunchDarkly, or the Meta/Google/TikTok/Apple ad and conversion APIs.</li>
<li class="font-claude-response-body whitespace-normal break-words pl-2">Familiarity with attribution, identity resolution, and conversion tracking, and the privacy constraints they operate under (consent management, state privacy laws, platform tracking restrictions).</li>
<li class="font-claude-response-body whitespace-normal break-words pl-2">Experience with A/B testing and experimentation frameworks, web performance optimization, and headless/CMS content tooling.</li>
<li class="font-claude-response-body whitespace-normal break-words pl-2">Experience with big data platforms and tooling, including Snowflake.</li>
<li class="font-claude-response-body whitespace-normal break-words pl-2">Proficient in CI/CD systems (preferably GitHub Actions), git, and automation; observability tools such as DataDog; and Infrastructure as Code using CDK or Terraform.</li>
<li class="font-claude-response-body whitespace-normal break-words pl-2">Skilled at elevating team standards through best practices and mentoring junior engineers.</li>
</ul><div class="content-pay-transparency"><div class="pay-input"><div class="description"><h3><strong>Compensation</strong></h3>
<p>Flex takes a market-based approach to pay, and compensation may vary depending on your primary work location. Work locations are categorized into one of three tiers based on a cost of labor index for that geographic area. The successful candidate’s starting pay will be commensurate with their experience, qualifications, and Flex’s internal leveling guidelines and benchmarks.</p></div><div class="title">Tier 1 (NYC/Bay Area, Los Angeles, Seattle)</div><div class="pay-range"><span>$200,000</span><span class="divider">—</span><span>$250,000 USD</span></div></div><div class