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Senior Software Engineer, Fullstack (Consumer Engineering)Affirm • St Louis, Missouri, United States
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Senior Software Engineer, Fullstack (Consumer Engineering)

Affirm
  • US
    St Louis, Missouri, United States
  • US
    St Louis, Missouri, United States
Apply Now

About

Affirm is reinventing credit to make it more honest and friendly, giving consumers the flexibility to buy now and pay later without any hidden fees or compounding interest.
Consumer Growth Experience Engineering (CGX) builds the platforms and end‑to‑end experiences that power affirm’s consumer growth across push, email, app, and web. We own the core engagement surfaces and systems that help customers discover value, onboard seamlessly, and take confident next steps by using personalization, segmentation, and experimentation to deliver the right experience at the right moment.
Our work sits at the intersection of product, analytics, design, platform, and growth. We focus on building scalable, reliable tooling and consumer experiences that enable rapid go‑to‑market, improve conversion and activation, and grow long‑term customer value. If you’re excited about shaping high‑impact consumer journeys, solving ambiguous growth problems, and turning strategy into measurable outcomes at scale, CGX is the team for you.
What You’ll Do
You will be responsible for owning and delivering quarterly goals for your team, leading engineers through ambiguity to solve open‑ended problems, and ensuring that everyone is supported throughout delivery.
You will support peers and stakeholders in the product development lifecycle by collaborating with product management, design, and analytics, participating in ideation, articulating technical constraints, and partnering on decisions that properly consider risks and trade‑offs.
You will proactively identify project, process, technology, or business issues, advocate for them, and lead in solving them.
You will support the operations and availability of your team’s artifacts by creating and monitoring metrics, escalating when needed, and supporting “keep the lights on” and on‑call efforts.
You will foster a culture of quality and ownership by setting or improving code review and design standards for your team, and advocating for them beyond your team through writing and tech talks.
You will help develop talent on your team by providing feedback and guidance, and leading by example.
What We Look For
You have experience leading significant mobile initiatives (React Native or native), including defining architecture, coordinating cross‑functional launches, and maintaining high reliability in production environments.
You have experience working across the React Native and native boundaries (Swift/Kotlin), debugging platform‑specific issues and improving developer tooling, CI/CD, and release processes for mobile apps.
You have experience implementing experimentation, feature flagging, and analytics instrumentation in mobile applications, ensuring safe rollouts and measurable impact.
You have experience shipping web apps using declarative UI frameworks like React or Vue.
You are proficient in working with JavaScript/TypeScript.
You have a total of 4+ years of experience as a software engineer.
You are experienced in designing, developing, and launching backend systems at scale using technologies like Python, Kotlin, AWS, MySQL, and Kubernetes.
You have experience defining a technical plan for the delivery of a significant feature or system component with an elegant, simple, and extensible design, and you write high‑quality code that is easily understood and used by others.
You are proficient at making significant changes in a large codebase and have developed a suite of tools and practices that enable you and your team to do so safely.
Your experience demonstrates that you take ownership of your growth, proactively seeking feedback from your team, your manager, and your stakeholders.
You have strong verbal and written communication skills that support effective collaboration with a global engineering team.
This position requires either equivalent practical experience or a Bachelor’s degree in a related field.
Pay Grade – N
Equity Grade – USA 8
Employees new to affirm typically come in at the start of the pay range. affirm focuses on providing a simple and transparent pay structure which is based on a variety of factors, including location, experience and job‑related skills.
Base pay is part of a total compensation package that may include equity rewards, monthly stipends for health, wellness and tech spending, and benefits (including 100% subsidized medical coverage, dental and vision for you and your dependents).
USA base pay range (CA, WA, NY, NJ, CT) per year: $190,000 – $240,000
USA base pay range (all other U.S. states) per year: $169,000 – $219,000
affirm is proud to be a remote‑first company! The majority of our roles are remote and you can work almost anywhere within the country of hire. We have a simple and transparent remote‑first grade‑based compensation structure. Offer amounts within the range are based on a number of factors including but not limited to job‑related skills, experience, and relevant education or training. Across the broader organization, certain roles are eligible for equity awards upon hire, promotion, tenure milestones and for performance.
Benefits
Health care coverage – affirm covers all premiums for all levels of coverage for you and your dependents
Flexible Spending Wallets – generous stipends for spending on technology, food, various lifestyle needs, and family forming expenses
Time off – competitive vacation and holiday schedules allowing you to take time off to rest and recharge
ESPP – an employee stock purchase plan enabling you to buy shares of affirm at a discount
We believe it’s on us to provide an inclusive interview experience for all, including people with disabilities. We are happy to provide reasonable accommodations to candidates in need of individualized support during the hiring process.
[For U.S. positions that could be performed in LosAngeles or SanFrancisco] Pursuant to the San Francisco Fair Chance Ordinance and Los Angeles Fair Chance Initiative for Hiring Ordinance, affirm will consider for employment qualified applicants with arrest and conviction records.
By clicking "Submit Application," you acknowledge that you have read affirm's Global Candidate Privacy Notice and hereby freely and unambiguously give informed consent to the collection, processing, use, and storage of your personal information as described therein.
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  • St Louis, Missouri, United States

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  • English
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