Senior Software Engineer, Fullstack (App Experience)

Affirm; Boston (MA); Remote; USD 173,000 - 233,000; Full time

Benefits offered by this job

Health coverage

Tech stipends

Flexible time off

ESPP

Job summary

Aff is a remote-first company focused on building scalable web and mobile experiences with clear API integrations. As a software engineer, you will work with a diverse team to deliver in phased milestones, collaborating with product, design and analytics while maintaining high code quality and test coverage.

You will contribute to owning growth, navigating a large codebase, and participating in interview processes to help shape a strong engineering culture.

Qualifications

• 1.5+ years of experience as a software engineer.
• Experience shipping web apps using React or Vue.
• Experience shipping mobile apps using React Native.
• Experience designing, developing and launching APIs at scale using Kotlin or Python.
• Ability to translate simple problems into multi-component solutions with well-tested code.
• Comfortable navigating large code bases and doing code reviews.
• Growth mindset with proactive feedback seeking.
• Strong verbal and written communication for global teams.
• Bachelor’s degree or equivalent practical experience.

Responsibilities

• Break down large projects into tasks and deliver in phases.
• Collaborate with product, design and analytics across the lifecycle.
• Support operations and on-call efforts; monitor metrics and escalate when needed.
• Contribute to team growth through interview participation and knowledge sharing.

Skills

1.5+ years experience

Strong communication

Code reviews

Growth mindset

Ownership of growth

Collaborative teamwork

Education

Bachelor's degree or equivalent

Tools

React

Vue

React Native

Kotlin

Python

Job description

At Aff, we exist for the moments that matter—giving people a clear, predictable way to pay over time, with no hidden fees, no surprises, and no tradeoffs on what matters most.

What You'll Do

• With the support of your team’s tech lead and manager, you will break down larger projects into individual tasks, deliver them in multiple phases, and collaborate with others to ensure timely delivery of your work.
• You will support your peers and stakeholders in the product development lifecycle by collaborating with product management, design & analytics by participating in ideation, articulating technical constraints, and partnering on decisions that properly consider risks and trade-offs.
• 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” & on-call efforts.
• You will contribute to a sense of community on your team by engaging in growth and development activities such as participation in the interview process.

What We Look For

• You have a total of 1.5+ years of experience as a software engineer.
• You have experience shipping web apps using declarative UI frameworks like React or Vue
• You have experience shipping mobile apps using native or cross-platform languages like React Native
• You have experience designing, developing and launching APIs at scale using languages like Kotlin or Python.
• You have mastered taking a simple problem or business scenario into a solution that interacts with multiple software components, and executing on it by writing clear, easily understood, well tested and extensible code.
• You are comfortable navigating a large code base, debugging others' code, and providing feedback to other engineers through code reviews.
• 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 our global engineering team.
• This position requires either equivalent practical experience or a Bachelor’s degree in a related field.

Base Pay Grade - N

Equity Grade - 9

Employees new to Aff typically come in at the start of the pay range. Aff 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: $195,000 - $255,000

USA base pay range (all other U.S. states) per year: $173,000 - $233,000

Remote-first with flexibility built in

Affirm is proud to be a remote-first company. Most roles can be done from almost anywhere within the country of employment. Some positions may occasionally require in-person work at an Aff office, and a few are office-based due to the nature of the work. All new hires will be invited to attend an in-person onboarding experience.

Benefits Designed For You

Our benefits reflect our commitment to care, transparency, and flexibility. Here are a few highlights:

• Health coverage at no cost: We cover 100% of premiums for employees and their dependents.
• Spending stipends: Monthly stipends support your tech setup, and the ability to choose health and wellness options that are right for you.
• Time off to recharge: Flexible time off and generous holiday calendars help you rest when you need to.
• Own a piece of what you build: Our employee stock purchase plan (ESPP) lets you buy Aff stock at a discount.

We’re committed to providing an inclusive interview process, including accommodations for candidates with disabilities. If you need support, we’re happy to help.

For positions based in San Francisco or Los Angeles: Aff considers qualified applicants with arrest and conviction records, as required by law.