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Checkout.com logoC
Checkout.comAll Departments

Senior Software Engineer I

ParisFull-timeSeniorSalary: Not disclosed
Posted Oct 9, 2026Deadline: Nov 21, 2026
Job SnapshotActively hiring
LocationParis
Job typeFull-time
SalaryNot disclosed
DeadlineNov 21, 2026

Finjobsly Role Intelligence

Experience level
Senior
Work style
Hybrid
Visa sponsorship
Not specified
Salary
Not disclosed
Key skills
PythonPostgreSQLRedisAWSGCPAzureKubernetesPaymentsComplianceData ScienceProduct ManagementAgile

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Finjobsly Intelligence— Generated from the employer's job description

What you'll own

Design, build, and operate scalable identity‑verification microservices, taking full ownership from concept through production monitoring, while writing clean, testable code and mentoring junior engineers.

What they're looking for

5+ years of software engineering experience with C#/.NET or Python, a CS/Engineering degree, strong communication, agile delivery skills, and a curiosity for AI/ML; cloud or database expertise is a plus.

Why this role matters

The role powers Checkout.com's core payment platform by ensuring reliable, compliant identity verification for billions of transactions, directly supporting global shopper trust and business growth.

Best suited to

A senior engineer who thrives on end‑to‑end product ownership, enjoys cross‑functional collaboration, is eager to explore AI/ML technologies, and likes mentoring teammates.

Fintech requirements

Visa sponsorship: No
Work arrangement: hybrid

About this role

Company Description

We’re Checkout.com. You might not know our name, but companies like eBay, Spotify, Klarna, Uber, and Sony do, because we’re behind many of the digital experiences you use every day.

We are where the world checks out, enabling over 10 billion transactions yearly for more than one billion global shoppers.

Whether you want to book a holiday, order food, renew a subscription, or check out online, there’s a good chance our tech powers the payments behind the scenes. Our platform helps the most ambitious businesses deliver effortless digital experiences, at scale.

If you want to do career-defining work, you’ve come to the right place. We move fast, think globally, and believe great teams are built by hiring exceptional people with conviction, curiosity, and the desire to make an impact.

With 20 offices across six continents and London as our HQ, we’re shaping the future of fintech – and we’re just getting started.

The opportunity

As a Senior Software Developer at Checkout.com, you will be embedded within the Identity Verification Team, a critical function focused on building innovative products to verify the identities of individuals and businesses globally.

In this high-impact role, you will be instrumental in the development of next-generation verification features, deploying intelligent, production-ready solutions by leveraging state-of-the-art Orchestration technologies as well as Generative AI and Computer Vision technologies.

You will be expected to work closely and collaboratively with Product, DevOps, DataScientist, and Data teams to ensure successful, end-to-end delivery of these solutions, while constantly researching and integrating emerging technologies. A core part of your contribution will be safeguarding data integrity and ensuring compliance, and translating complex data insights into clear, actionable recommendations for stakeholders to support informed, data-driven decision-making across Checkout.com.

What you will be doing

  • Drive the design and development of innovative, complex and scalable applications for real-world identity verification challenges in a wider microservices using industry best practices.
  • Take full ownership of new and existing features and service, managing the end-to-end lifecycle from initial conceptualization and design through to deployment and monitoring in a production environment.
  • Actively collaborate with cross-functional teams (Engineering, Product, Risk) across the company to maximize the positive impact of data science initiatives.
  • Champion a culture of technical excellence, cross-team learning, and knowledge sharing within the Data organization.
  • Be part of, and collaborate with, cross-functional teams including product management, across a large engineering community.
  • Write clean, maintainable, extendable and testable code on some of Checkout’s most impactful systems.
  • Build, own and operate your systems to the highest levels of resilience and service.
  • Mentor junior team members and assist in their technical development

What are we looking for

  • Bachelor's or Master's degree in Computer Science, Engineering, or related field
  • Over 5 years of experience as a Software Engineer working with complex, large-scale, and diversified applications and tech stacks.
  • Proficiency in C# .NET or Python, with a strong understanding of software development principles in either a backend or full stack environment.
  • Great communication skills and ability to interact effectively with a wide range of stakeholders
  • Experience working in agile environments and delivering high-quality code within tight deadlines
  • Excellent problem-solving skills and the ability to work independently as well as part of a team
  • Someone who is AI proficient or AI curious, you will be hungry to embrace what the latest technology has to offer to enhance yours and your teams productivity
  • Payments or financial knowledge is a plus, but not a necessity

Nice to have

  • Experience with Cloud and Infrastructure technologies like AWS, GCP, Azure, Kubernetes, prometheus...
  • Experience with Databases like Postgresql, Mongo, Redis, ...
  • Direct experience solving real-world business problems through innovative, data-driven approaches.
  • Any experience in other programming languages not mentioned above.

Additional Information

Bring all of you to work

We create the conditions for high performers to thrive, through real ownership, fewer blockers, and work that makes a difference from day one.

Here, you’ll move fast, take on meaningful challenges, and be recognized for the impact you deliver. It’s a place where ambition gets met with opportunity, and where your growth is in your hands.

We work as one team, and we back each other to succeed. So whatever your background or identity, if you’re ready to grow and make a difference, you’ll be right at home here.

It’s important we set you up for success and make our process as accessible as possible. So let us know in your application, or tell your recruiter directly, if you need anything to make your experience or working environment more comfortable.

Life at Checkout.com

We understand that work is just one part of your life. Our hybrid working model offers flexibility, with three days per week in the office to support collaboration and connection.

Curious about what it’s like to be part of our team? Visit our Careers Page to learn more about our culture, open roles, and what drives us.

For a closer look at daily life at Checkout.com, follow us on LinkedIn and Instagram

More about this role

About company

Checkout.com logoC

Checkout.com

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Required skills

PythonPostgreSQLRedisAWSGCPAzureKubernetesPaymentsComplianceData ScienceProduct ManagementAgile

Explore more

More Software Engineering Jobs→More jobs at Checkout.com→Python jobs →PostgreSQL jobs →Salary benchmarks for this role →Browse all fintech jobs →

Checkout.com

Senior Software Engineer I

ParisSalary: Not disclosed

Company insights

70

70/100 estimated sentiment

AI Estimate

AI estimate from public information — not verified employee data

Checkout.com launches stablecoin acceptance with Coinbase

Checkout.com launched a Coinbase Payments-powered capability enabling eligible enterprise merchants to accept stablecoin payments from consumers.

June 2026From the webCheckout.com Newsroom→

Checkout.com returns to full-year EBITDA profitability

Checkout.com reported an adjusted EBITDA margin above 10% for 2025, over $300B in payment volume, 64% volume growth and more than 30% net revenue growth.

February 2026From the webCheckout.com Newsroom→

Ashley Paulus appointed to lead UK and European revenue growth

Checkout.com named Ashley Paulus VP, Head of Revenue for the UK and EEA, putting her in charge of commercial strategy and enterprise growth across the regions.

February 2026From the webCheckout.com Newsroom→

Employee share buyback values Checkout.com at $12 billion

Checkout.com offered employees liquidity through a share buyback at a $12B valuation, a 30% increase from its previous internal valuation.

September 2025From the webForbes→

AI Generated Insights