Senior Backend Developer (Payments)

Loop; Toronto; On-site; CAD 140,000 - 170,000; Full time

Job summary

A fast-growing fintech startup is seeking a Senior Backend Developer to architect and build a payment platform and financial ledger system in Toronto. The ideal candidate will have 5+ years of backend development experience, strong financial systems knowledge and a product mindset. Responsibilities include building reliable payment infrastructure and collaborating with stakeholders to ensure data integrity. This position offers a salary range of CAD$140,000 to CAD$170,000 annually, equity options, and benefits.

Benefits

Equity options

Health benefits after probation

Catered lunch on Fridays

Kitchen with snacks and drinks

Qualifications

• 5+ years of backend development experience; minimum 3 years in financial systems.
• Deep understanding of financial ledgers and double-entry bookkeeping.
• Experience with event sourcing and message brokers, particularly Kafka.

Responsibilities

• Build and support Payment Infrastructure with strict data integrity.
• Implement workflow orchestration for complex payment flows.
• Work directly with stakeholders to define solutions.

Skills

Backend development

Financial systems

Event sourcing

Distributed systems

Problem-solving mindset

Tools

Kafka

Temporal.io

Job description

We're a fast-growing fintech startup building the only truly cross-border banking platform. We help businesses seamlessly manage money around the world so they can access more markets, accelerate their growth, and simplify their operations. We're looking for ambitious people to join our mission.

We're looking for engineers with a product mindset - people who think about the user's problem first, not just the component they're building. You'll work directly with stakeholders, make trade-off decisions, and own outcomes, not just output.

About the Role

Hi, I'm Yan , Head of Engineering at Loop, and I'm hiring a Senior Backend Developer to architect and build our payment platform and financial ledger system. In this role, you'll build the systems that move money - the foundation everything else depends on.

This is an onsite position at our downtown Toronto office (Adelaide and Spadina).

Why We Exist

Small businesses have been underserved by traditional banks. Most businesses operate globally, yet moving money across borders is still painfully hard. Banking fees are opaque, while the process and time to send or receive money internationally is decades old. The tools offered to businesses are only suitable for companies with finance and treasury teams of 20.

Loop exists to change that.

We're building the banking infrastructure for businesses that operate globally by default. Multi-currency accounts. Seamless international payments. Modern systems to manage company finances. The things that should have existed years ago.

What You'll Be Doing

• Build and support our Payment Infrastructure with strict data integrity
• Work in a cross-country environment handling data segregation and legal compliance across jurisdictions
• Implement workflow orchestration with Temporal.io for complex payment flows and system consistency
• Work directly with stakeholders to understand problems and define solutions
• Make informed technical decisions that balance user needs, business goals, and engineering constraints
• Build integrations with banking partners and payment processors
• Design for fault-tolerance, recovery, and comprehensive audit trails
• Develop end-to-end features that help businesses manage money across borders" as the first bullet. Makes it clear they're building product, not just infrastructure

What We're Looking For

• 5+ years backend development, 3+ years in financial systems
• Deep understanding of financial ledgers and double-entry bookkeeping
• Experience with event sourcing, CQRS, and message brokers (especially Kafka)
• Distributed systems expertise - consistency, availability, fault tolerance
• Product mindset - you care about the problem you're solving, not just the system you're building
• You think about what happens when things go wrong

Bonus: Temporal.io, event architecture, regulatory knowledge, SWIFT/SEPA/Fedwire familiarity.

What we offer

• Salary range CAD$140,000 to CAD$170,000 base annual, commensurate with experience
• Equity ranging 0.01-0.1%
• Enrollment in group's health benefits after probation period
• This role is onsite in our downtown Toronto office
• Kitchen full of snacks and drinks to keep you going throughout the day
• Catered lunch on Fridays (we take recommendations!)

The Challenge

Before we talk, show us how you think:

A batch of cross-border payments settles overnight. In the morning, reconciliation shows discrepancies: some transactions are off by pennies, others by dollars. The total doesn't match what we expected after FX conversion.

In under 500 words, walk us through how you'd investigate this. What are the likely causes? What data would you look at first? How would you design systems to prevent or catch this earlier?

• 15 minutes video call to discuss the opportunity and the organization with Mandy, People and Business Operations Specialist
• 30 minutes video call conversation with Yan, Head of Engineering
• 90 minutes in person technical discussion with Ryan, Engineering Manager and one other senior developer
• 60 minutes in person meeting with Cato, CEO and Co-Founder and Sarah, Chief of Staff
• Come do a work trial with us for 2-3 days (this will be paid)
• Background check and offer

How to Apply

To apply for this position, please click “apply” and share your resume, alongside a brief paragraph about yourself and your previous experience. Don't forget to send us your challenge!

Your application will be reviewed by our recruiters and hiring managers; we do not use AI tools for screening or selection.

Loop is committed to creating a diverse culture. We encourage you to apply regardless of who you are or where you came from - what matters is the journey ahead. Put simply, if you’re unsure about your qualifications for this position, we’d still encourage you to apply!