Backend Engineer

About Outpost

What if going global was as simple as going local

Outpost is building the AI global trade engine. The accumulated knowledge of every rule youd need to sell internationally turned into infrastructure. Tell us what youre selling. Well tell you how to sell it everywhere.

We operate as Merchant of Record or Tax of Record across 58 tax jurisdictions. Full liability transfer or just the tax layer. We do the analysis we handle the setup we absorb the liability.

Sell anything anywhere. Without compromise.

The Role

This is a Backend Engineer role for someone who wants to build complex financial infrastructure from scratch.

Youll work directly with our engineering leadership to implement payment flows build tax calculation engines and create the systems that power international commerce. Youll contribute to product and technical discussions challenge assumptions and help guide our technical direction.

Were building the infrastructure that lets businesses sell globally without the usual pain. That means payment processing multi-currency ledgers real-time tax calculations merchant onboarding and AI-powered compliance tools. Hard problems with real scale.

What Youll Get

Yes the work is intense. But in return youll build critical financial infrastructure that handles hundreds of millions in volume.

Youll have significant input into technical direction work with a small team of experienced engineers and shape how Outpost scales. If you want to go deep on payments tax and fintech infrastructure this is the role.

What Youll Build

Payment processing infrastructure handling hundreds of millions in volume

Robust ledger and reconciliation systems

Tax calculation engines for multiple jurisdictions

Real-time transaction monitoring and risk systems

Merchant onboarding and integration frameworks

Platform connections with major e-commerce systems

AI/LLM powered taxation tools

AI/LLM powered fraud and risk tools

What Youll Do

Technical Development

Write high-quality maintainable code

Implement core payment and financial systems

Build secure scalable backend services

Contribute to system architecture discussions

Help establish engineering best practices

System Design & Implementation

Design and build robust payment processing flows

Implement internal ledger and reconciliation systems

Create merchant integration frameworks

Develop automated monitoring and alerting

Handle secure financial data processing

Cross-functional Collaboration

Work with product team to refine technical requirements

Contribute to API design and implementation

Collaborate with risk and compliance on system requirements

Example Projects

Implement a multi-currency ledger that handles real-time reconciliation

Create the tax calculation engine for a new jurisdiction

Design the merchant onboarding flow and integration framework

Build AI-powered tools for automated tax classification

Implement real-time fraud detection and risk scoring

Create automated reconciliation systems that catch discrepancies before they become problems

What Were Looking For

Ideal background:

Fluency in a JVM-based language preferably Kotlin

Track record of implementing complex backend systems

Strong engineering fundamentals and coding practices

Bonus: experience building financial payments tax or compliance systems

Bonus: familiarity with e-commerce platforms

Signals we care about:

You write high-quality code and care about maintainability

You can design systems not just implement them

Youre comfortable with ambiguity and figuring things out

You contribute to technical discussions and challenge assumptions

You want to build from scratch not maintain existing systems

Bias for action. You ship you learn you iterate

What this role is not:

Not maintaining existing systems. Youll build from scratch

Not a role where you wait to be told what to do

Not someone who needs heavy process or detailed specs to be effective

Not pure execution without input into technical direction

Why This Role Is Different

Most backend roles are about maintaining or extending existing systems. This role is about building complex financial infrastructure from the ground up.

Youll tackle challenges like managing multiple currency ledgers handling card payment flows building automated reconciliation systems and creating AI-powered tax tools. Youll have significant input into our technical direction.

If youre excited about building complex payment systems and want to shape the future of international commerce this is the role.

Outpost Team

Our team were leaders at Revolut Airwallex Adyen and Wayflyer and were backed by top-tier investors who have built or backed some of the worlds leading fintechs.

What We Offer

Equity and salary in a well-funded startup

Ability to own your work and move fast

Direct access to the founding team

A global mission with real impact

Low politics high output

A culture of builders not talkers

Working Style

We work together in person in London. We believe the hardest problems are solved in the room.

Learn More

Outpost Culture: Outpost founder: is where the hard problems are. If you want to build the financial infrastructure for global commerce wed love to hear from you.

Required Experience:

IC