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Senior Software Engineer, Fullstack (International)

Join Affirm as a Senior Software Engineer to build and improve financial products for international markets with a remote-first team.

Location
Spain
Compensation
€86k–€122k/yr
Level
senior
Type
full time · Remote

Posted by employer 2 days ago

First seen on Joblaze 1 day ago

Last verified on the company career page 1 day ago

What you'll build

  • Own and deliver quarterly goals for your team
  • Lead engineers through ambiguity to solve open-ended problems
  • Support product development lifecycle
  • Create and monitor metrics for team artifacts
  • Foster a culture of quality and ownership

Must have

  • 4+ years of experience as a software engineer
  • Experience in backend systems at scale
  • Experience shipping web apps using declarative UI frameworks
  • Proficient at making significant changes in a large code base
  • Strong verbal and written communication skills

Practical constraints

  • On-Call Rotation required

AI in the day-to-day

You efficiently use AI to assist you to deliver high quality products on a daily basis.

Requirements

Experience
4+ years
Visa
Sponsorship available

Benefits

Flexible Spending Wallets Learning & Development Programs Equity/Stock Options Health Insurance Parental Leave

Joblaze summary

In this role, the Senior Software Engineer will lead a full-stack team in developing and delivering financial products for international markets, focusing on both backend and frontend solutions. Proficiency in technologies such as Python, Kotlin, AWS, and React is essential, along with a strong ability to navigate complex codebases and advocate for quality standards. This position is suited for experienced engineers who thrive in agile environments and are eager to mentor others while driving impactful projects. The team operates within a remote-first model, emphasizing collaboration across European time zones.

Joblaze insights

  • Listed yesterday — first seen on Joblaze November 14, 2026. Last confirmed on Affirm's careers page November 14, 2026.
  • This exact title is also open at 2 other locations at Affirm: Poland, Remote UK.
  • Starts above 10% of 176 comparable senior fullstack roles we track (median $160,000 across 75 companies).

Quick facts

Is the Senior Software Engineer, Fullstack (International) role remote?
Yes — Affirm lists this as a fully remote position.
What's the salary range?
Affirm lists €86,000–€122,000 for this role.
How much experience is required?
At least 4 years of relevant experience for this Senior Software Engineer, Fullstack (International) role.
What's the tech stack?
Joblaze extracted these technologies from the posting: AWS, Kotlin, Kubernetes, MySQL, Python, React.
Does Affirm sponsor work visas for this role?
Yes — the posting indicates visa sponsorship is available for the right candidate.
What seniority level is this role?
Affirm targets senior candidates for this position.
Is this full-time or contract?
Full-time for this Senior Software Engineer, Fullstack (International) role at Affirm.

From the original posting

At Affirm, 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.

The International Accelerator Engineering team is growing, and we're looking for a Senior Software Engineer to join us! We're a full-stack team located entirely in Europe within the same time zone, but culturally rooted in Silicon Valley. We directly improve the financial lives of over 20 million people shaping how Affirm builds Direct-to-Consumer products for Canada, the UK, and future international markets. We build and own various products used by our consumers, like the Affirm App and other Direct to Consumer products across international markets. We are here to make sure we reach and provide useful tools to our users so they can experience honest financial products at their fullest.

Our work is agile and fast-paced, shipping new code to production for millions to use across geographies and rigorously measuring the impact it has on them. This role rewards curiosity, ownership, ability to zoom in and out, switch contexts often, also in an open contribution model, and a builder's mindset. You'll know exactly what your objectives are, you'll have what you need to hit them, and you'll choose your own path to get there, while constantly looking for ways to get AI to increase productivity on a daily basis. You'll learn quickly from experienced teammates and grow your craft on problems that matter at scale.

If you want to build something new and operate it at scale – come join us!


What You'll Do:

  • You will be responsible for owning and delivering quarterly goals for your team, leading engineers on your team through ambiguity to solve open-ended problems, and ensuring that everyone is supported throughout delivery.
  • 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 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” & on-call efforts.
  • You will foster a culture of quality and ownership on your team by setting or improving code review and design standards for your team, and advocating for them beyond your team through your writing and tech talks.
  • You will help develop talent on your team by providing feedback and guidance, and leading by example.
  • On-Call Rotation - There would be an on-call rotation for this role as a requirement.


What We Look For:

· 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 technologies like Python, Kotlin, AWS, MySQL, and Kubernetes.
· You have experience shipping web apps using declarative UI frameworks like React or Vue.
- You efficiently use AI to assist you to deliver high quality products on a daily basis
· You have experience defining a technical plan for the delivery of a significant feature or system component with an elegant, simple and extensible design. You write high quality code that is easily understood and used by others.
· You are proficient at making significant changes in a large code base, 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 our global engineering team.

Compensation & Benefits
Pay Grade - N
Equity Grade - 4

Base pay is part of a total compensation package that may include monthly stipends for health, wellness and tech spending, and benefits (including 100% subsidized medical coverage, dental and vision for you and your dependents). In addition, the employees may be eligible for equity rewards offered by Affirm Holdings, Inc. (parent company).

ESP base pay range per year: €86,000 - €122,000

Additional benefits include:
• Flexible Spending Wallets for tech, food and lifestyle
• Away Days - wellness days to take off work and recharge
• Learning & Development programs
• Parental benefits
• Employee Resource & Community Groups

Location - Remote Spain

We are able to offer visa sponsorship for this role, but do require that someone is based in Spain for the role.

#LI-Remote

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 Affirm 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.

By clicking "Submit Application," you acknowledge that you have read Affirm's Global Candidate Privacy Notice and consent to the use of your personal information as described.

Standard company text repeated across Affirm's postings is omitted here.

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