Back End Engineer - iwocaPay

Methodfi; City of London; Hybrid; GBP 60,000 - 70,000; Full time

Job summary

A leading fintech company is seeking a Back End Engineer to join its iwocaPay team in London. The role involves building APIs and ecommerce plugins to enhance supplier payment processes. Candidates should have strong back end engineering experience, ideally in Python, and a solid understanding of API design. This position offers a hybrid working model and a salary of £60,000–£70,000, along with comprehensive benefits including flexible working and professional development opportunities.

Benefits

Flexible working

Medical insurance

Unlimited unpaid leave

25 days holiday plus birthday off

Learning and development budget

Cycle-to-work scheme

Company retreats

Qualifications

• Significant back end engineering experience, ideally using Python.
• Experience designing, building, and maintaining API endpoints.
• Experience with PostgreSQL and/or other relational databases.

Responsibilities

• Build APIs and ecommerce plugins for suppliers.
• Work closely with product, design, operations, and other teams.
• Shape the end-to-end experience for buyers and suppliers.

Skills

Back end engineering experience

API design and maintenance

PostgreSQL or relational databases

Strong communication skills

Education

Degree in relevant field or significant industry experience

Tools

Python

React/TypeScript

PHP

Job description

Overview

Back End Engineer - iwocaPay

Hybrid working in London, UK (At least one day in office per week)

We’re looking for a Back End Engineer to join our iwocaPay team

iwocaPay provides trade credit and Buy-Now-Pay-Later (BNPL) solutions to businesses. The team works with hundreds of sellers to help thousands of buyers manage their cash flow, increase their purchasing power and operate with flexibility.

The company

Imagine a world where every small business has the power to thrive. That’s the world we’re building at iwoca. Small businesses aren’t just statistics – they’re the heartbeat of our communities, the character of our high streets, and the engine of our economy. Since 2012, we’ve revolutionised how these businesses access finance, turning what was once a lengthy, frustrating process into something remarkable: funding that’s fast, flexible, and actually works for modern businesses.

Our impact speaks for itself: we’ve provided billions in funding to over 150,000 businesses across Europe, making us one of the continent’s leading fintech innovators. But we’re just getting started. Our mission? To empower one million businesses with the financial tools they deserve.

We combine cutting-edge technology and data science with genuine human understanding to make finance feel less like a barrier and more like a superpower. Whether it’s managing cash flow or seizing unexpected opportunities, we ensure businesses get the funds they need – often within minutes.

The team

The iwocaPay team runs like an independent start-up within iwoca. We build trade credit and Buy-Now-Pay-Later (BNPL) solutions for businesses. Our product helps thousands of buyers manage their cash flow and purchasing power, while supporting hundreds of sellers to offer flexible payment options.

We’re growing fast, now over 30 people strong, with seven engineers, two product managers, one designer, and a full set of operational roles. We’re committed to doing good work and moving quickly, iterating frequently to ship features that matter. We run daily standups and regular offsites to stay connected. We also work closely with other iwoca teams, sharing code and benefiting from shared resources, such as our dedicated DevOps team.

The role

As a Back End engineer in the iwocaPay team, you’ll build APIs and ecommerce plugins that help suppliers get paid fast. You’ll shape the end-to-end experience for buyers and suppliers, using data to guide improvements and measure impact. You’ll work closely with product, design, operations, and other teams to deliver high-quality, user-focused features.

The projects

• Improving checkout conversion: We’re testing different UX approaches and payment options to reduce friction at checkout and increase conversion for sellers using iwocaPay. This includes experimenting with offer layouts, messaging, and eligibility visibility.
• Smarter credit decisions: We’re enhancing our decision engine to offer more accurate and instant credit decisions for buyers, based on real-time data. This includes refining our models to support higher-value transactions and broader customer segments.
• Ecommerce integrations: We’re expanding and improving our plugins for major ecommerce platforms, making them easier for suppliers to install and use. The goal is to simplify onboarding while supporting more use cases out of the box.
• Seamless use of other iwoca products: We’re making it easier for our customers to access all of iwoca’s products. The goal is to create a seamless journey for customers, allowing them to effortlessly move between iwocaPay and other solutions like a Flexi-Loan or a credit card.

The requirements

Essential:

• Significant back end engineering experience, ideally using Python
• Experience designing, building, and maintaining API endpoints
• Experience with PostgreSQL and/or other relational databases
• Strong communication skills, with the ability to translate business needs into clear, effective technical solutions

Bonus:

• Confidence in working across the full stack, including front-end development in React/TypeScript, with a desire to learn new technologies
• Familiarity with PHP, particularly for contributing to ecommerce plugins
• Understanding of DevOps practices, including containerisation and CI/CD
• A strong numerical or technical background, with a degree in maths, physics, computer science, engineering, or relevant industry experience

The salary

We expect to pay from £60,000–£70,000 for this role. But, we’re open-minded, so definitely include your salary goals with your application. We routinely benchmark salaries against market rates, and run quarterly performance and salary reviews.

The culture

At iwoca, we prioritise a culture of learning, growth, and support, and invest in the professional development of our team members. We value diversity in thought and skill, and encourage you to explore new areas of interest to help us improve our products and services.

The offices

We put a lot of effort into making iwoca a brilliant place to work:

• Offices in London, Leeds, Berlin, and Frankfurt with plenty of drinks and snacks
• Events and clubs, like bingo, comedy nights, yoga classes, football, etc.

The benefits

• Flexible working.
• Medical insurance from Vitality, including discounted gym membership
• A private GP service (separate from Vitality) for you, your partner, and your dependents.
• 25 days’ holiday, an extra day off for your birthday, the option to buy or sell an additional five days of annual leave, and unlimited unpaid leave
• A one-month, fully paid sabbatical after four years.
• Instant access to emotional and mental health support.
• 3% Pension contributions and share options.
• Generous parental leave and a nursery tax benefit scheme to help you save money.
• Cycle-to-work scheme and electric car scheme.
• Two company retreats a year, we’ve been to France, Italy, Spain, and further afield.

The learning

And to make sure we all keep learning, we offer:

• Protected time and a learning and development budget for everyone.
• Company-wide talks with internal and external speakers.
• Access to learning platforms like Treehouse.