# Backend Engineer

[Outpostnow](https://gurify.com/jobs?q=Outpostnow) · London · Posted 7 months ago

[Backend](https://gurify.com/jobs/backend)

[Apply on the original posting → (opens in a new tab)](https://jobs.ashbyhq.com/outpostnow/74279b0b-1996-4c50-9990-be1f861cc404)

## Job description

### 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 you'd need to sell internationally, turned into infrastructure. Tell us what you're selling. We'll 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.

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

We're 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 You'll Get

Yes, the work is intense. But in return, you'll build critical financial infrastructure that handles hundreds of millions in volume.

You'll 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 You'll 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 You'll 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 We're 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

- You're 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. You'll 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.

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

If you're 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 we're backed by top-tier investors who have built or backed some of the world's 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

emile@outpostnow.com

Outpost Culture: https://www.notion.so/Outpost-Culture-18aa047bb9af800b8f6ff5f5c83174b1 Outpost founder: http://www.littlegoatlabs.com/

Outpost is where the hard problems are. If you want to build the financial infrastructure for global commerce, we'd love to hear from you.

**Live in Outpostnow’s hiring system.** Read from the company's own applicant tracking system, not reposted from a job board — so it's a real, open requisition rather than an ad that outlived the role.

We remove it as soon as it disappears at source.

## More jobs like this

- MK [Senior Backend Engineer](https://gurify.com/job/senior-backend-engineer-at-m-kopa-af697bad07c0) M Kopa · London · 6 days ago
- ZE [Lead Backend Engineer](https://gurify.com/job/lead-backend-engineer-at-zego-ced8e35af07c) Zego · London · 4 days ago
- BJ [Senior Backend Engineer, Platform & Integrations](https://gurify.com/job/senior-backend-engineer-platform-integrations-at-bjak-7c9dec16f563) Bjak · United Kingdom · 3 weeks ago
- ZU [Senior Backend Engineer (Ruby) - Zuno Tech Group](https://gurify.com/job/senior-backend-engineer-ruby-zuno-tech-group-at-zunogroup-7fb1cd337627) Zunogroup · London · last week
- CO [Senior Search Backend Engineer (m/f/x)](https://gurify.com/job/senior-search-backend-engineer-m-f-x-at-commercetools-0c00a5afbebe) Commercetools · London, England, United Kingdom (Hybrid) · 5 days ago
- SB [Senior Backend Engineer](https://gurify.com/job/senior-backend-engineer-581c1b850f41) London · 3 weeks ago

```json
{"@context":"https://schema.org/","@type":"JobPosting","title":"Backend Engineer","description":"\u003Ch3\u003EBACKEND ENGINEER\u003C/h3\u003E\u003Cp\u003E\u0026#127757; About Outpost\u003C/p\u003E\u003Cp\u003EWhat if going global was as simple as going local?\u003C/p\u003E\u003Cp\u003EOutpost is building the AI global trade engine. The accumulated knowledge of every rule you\u0026#39;d need to sell internationally, turned into infrastructure. Tell us what you\u0026#39;re selling. We\u0026#39;ll tell you how to sell it everywhere.\u003C/p\u003E\u003Cp\u003EWe operate as Merchant of Record or Tax of Record across 58\u002B tax jurisdictions. Full liability transfer, or just the tax layer. We do the analysis, we handle the setup, we absorb the liability.\u003C/p\u003E\u003Cp\u003ESell anything, anywhere. Without compromise.\u003C/p\u003E\u003Cp\u003E\u0026#129504; The Role\u003C/p\u003E\u003Cp\u003EThis is a Backend Engineer role for someone who wants to build complex financial infrastructure from scratch.\u003C/p\u003E\u003Cp\u003EYou\u0026#39;ll work directly with our engineering leadership to implement payment flows, build tax calculation engines, and create the systems that power international commerce. You\u0026#39;ll contribute to product and technical discussions, challenge assumptions, and help guide our technical direction.\u003C/p\u003E\u003Cp\u003EWe\u0026#39;re 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.\u003C/p\u003E\u003Cp\u003E\u0026#129495; What You\u0026#39;ll Get\u003C/p\u003E\u003Cp\u003EYes, the work is intense. But in return, you\u0026#39;ll build critical financial infrastructure that handles hundreds of millions in volume.\u003C/p\u003E\u003Cp\u003EYou\u0026#39;ll 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.\u003C/p\u003E\u003Cp\u003E\u0026#129513; What You\u0026#39;ll Build\u003C/p\u003E\u003Cul\u003E\u003Cli\u003EPayment processing infrastructure handling hundreds of millions in volume\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003ERobust ledger and reconciliation systems\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003ETax calculation engines for multiple jurisdictions\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EReal-time transaction monitoring and risk systems\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EMerchant onboarding and integration frameworks\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EPlatform connections with major e-commerce systems\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EAI/LLM powered taxation tools\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EAI/LLM powered fraud and risk tools\u003C/li\u003E\u003C/ul\u003E\u003Cp\u003E\u0026#129513; What You\u0026#39;ll Do\u003C/p\u003E\u003Ch3\u003ETechnical Development\u003C/h3\u003E\u003Cul\u003E\u003Cli\u003EWrite high-quality, maintainable code\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EImplement core payment and financial systems\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EBuild secure, scalable backend services\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EContribute to system architecture discussions\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EHelp establish engineering best practices\u003C/li\u003E\u003C/ul\u003E\u003Ch3\u003ESystem Design \u0026amp; Implementation\u003C/h3\u003E\u003Cul\u003E\u003Cli\u003EDesign and build robust payment processing flows\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EImplement internal ledger and reconciliation systems\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003ECreate merchant integration frameworks\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EDevelop automated monitoring and alerting\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EHandle secure financial data processing\u003C/li\u003E\u003C/ul\u003E\u003Ch3\u003ECross-functional Collaboration\u003C/h3\u003E\u003Cul\u003E\u003Cli\u003EWork with product team to refine technical requirements\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EContribute to API design and implementation\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003ECollaborate with risk and compliance on system requirements\u003C/li\u003E\u003C/ul\u003E\u003Cp\u003E\u0026#128165; Example Projects\u003C/p\u003E\u003Cul\u003E\u003Cli\u003EImplement a multi-currency ledger that handles real-time reconciliation\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003ECreate the tax calculation engine for a new jurisdiction\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EDesign the merchant onboarding flow and integration framework\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EBuild AI-powered tools for automated tax classification\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EImplement real-time fraud detection and risk scoring\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003ECreate automated reconciliation systems that catch discrepancies before they become problems\u003C/li\u003E\u003C/ul\u003E\u003Cp\u003E\u0026#129521; What We\u0026#39;re Looking For\u003C/p\u003E\u003Ch3\u003EIdeal background:\u003C/h3\u003E\u003Cul\u003E\u003Cli\u003EFluency in a JVM-based language, preferably Kotlin\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003ETrack record of implementing complex backend systems\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EStrong engineering fundamentals and coding practices\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EBonus: experience building financial, payments, tax, or compliance systems\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EBonus: familiarity with e-commerce platforms\u003C/li\u003E\u003C/ul\u003E\u003Ch3\u003ESignals we care about:\u003C/h3\u003E\u003Cul\u003E\u003Cli\u003EYou write high-quality code and care about maintainability\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EYou can design systems, not just implement them\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EYou\u0026#39;re comfortable with ambiguity and figuring things out\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EYou contribute to technical discussions and challenge assumptions\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EYou want to build from scratch, not maintain existing systems\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EBias for action. You ship, you learn, you iterate\u003C/li\u003E\u003C/ul\u003E\u003Ch3\u003EWhat this role is not:\u003C/h3\u003E\u003Cul\u003E\u003Cli\u003ENot maintaining existing systems. You\u0026#39;ll build from scratch\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003ENot a role where you wait to be told what to do\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003ENot someone who needs heavy process or detailed specs to be effective\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003ENot pure execution without input into technical direction\u003C/li\u003E\u003C/ul\u003E\u003Cp\u003E\u0026#128640; Why This Role Is Different\u003C/p\u003E\u003Cp\u003EMost backend roles are about maintaining or extending existing systems. This role is about building complex financial infrastructure from the ground up.\u003C/p\u003E\u003Cp\u003EYou\u0026#39;ll tackle challenges like managing multiple currency ledgers, handling card payment flows, building automated reconciliation systems, and creating AI-powered tax tools. You\u0026#39;ll have significant input into our technical direction.\u003C/p\u003E\u003Cp\u003EIf you\u0026#39;re excited about building complex payment systems and want to shape the future of international commerce, this is the role.\u003C/p\u003E\u003Cp\u003E\u0026#129470; Outpost Team\u003C/p\u003E\u003Cp\u003EOur team were leaders at Revolut, Airwallex, Adyen and Wayflyer, and we\u0026#39;re backed by top-tier investors who have built or backed some of the world\u0026#39;s leading fintechs.\u003C/p\u003E\u003Cp\u003E\u0026#129534; What We Offer\u003C/p\u003E\u003Cul\u003E\u003Cli\u003EEquity and salary in a well-funded startup\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EAbility to own your work and move fast\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EDirect access to the founding team\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EA global mission with real impact\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003ELow politics, high output\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EA culture of builders, not talkers\u003C/li\u003E\u003C/ul\u003E\u003Cp\u003E\u0026#129517; Working Style\u003C/p\u003E\u003Cp\u003EWe work together in person in London. We believe the hardest problems are solved in the room.\u003C/p\u003E\u003Cp\u003E\u0026#127758; Learn More\u003C/p\u003E\u003Cp\u003Eemile@outpostnow.com\u003C/p\u003E\u003Cp\u003EOutpost Culture: https://www.notion.so/Outpost-Culture-18aa047bb9af800b8f6ff5f5c83174b1 Outpost founder: http://www.littlegoatlabs.com/\u003C/p\u003E\u003Cp\u003EOutpost is where the hard problems are. If you want to build the financial infrastructure for global commerce, we\u0026#39;d love to hear from you.\u003C/p\u003E","identifier":{"@type":"PropertyValue","name":"Gurify","value":"backend-engineer-at-outpostnow-6149fdb07a25"},"url":"https://gurify.com/job/backend-engineer-at-outpostnow-6149fdb07a25","datePosted":"2026-01-26","validThrough":"2026-11-04T23:59:59Z","hiringOrganization":{"@type":"Organization","name":"Outpostnow","sameAs":"https://jobs.ashbyhq.com/outpostnow"},"directApply":false,"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","addressCountry":"GB","addressLocality":"London"}}}
```

```json
{"@context":"https://schema.org/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Jobs","item":"https://gurify.com/jobs"},{"@type":"ListItem","position":2,"name":"United Kingdom","item":"https://gurify.com/jobs/united-kingdom"},{"@type":"ListItem","position":3,"name":"Backend Engineer","item":"https://gurify.com/job/backend-engineer-at-outpostnow-6149fdb07a25"}]}
```