Senior Back-End Engineer - Ledger Platform
iwocaLondon, England, United Kingdom
Added 13 Aug · still live
Not disclosed
Salary
Not disclosed by employer
£54,700
Going rate
Skilled Worker going rate
This role may qualify for a Skilled Worker visa
SOC 2134 is an eligible occupation, but we classified this role with low confidence (57% match). If the code is right — and iwoca is a licensed sponsor — it should qualify, but double-check the occupation eligibility rules against the actual role.
About the role
Hybrid in London (UK) or Remote within the UK
We’re looking for a Senior Back-End Engineer
This role is a chance to tackle complex, high-impact challenges at the heart of our fintech platform. You will join the team that owns iwoca's ledger — the system of record for the money we lend and collect — and you will be responsible for scaling it across the full lifecycle of our credit card and lending products, building the reconciliation and reporting that prove it correct, and laying the foundations for our next generation of products. This is a hands-on role: you'll design these systems, write the code, and own them in production.
The Company
Small businesses move fast. Opportunities often don’t wait, and cash flow pressures can appear overnight. To keep going, and growing, SMEs need finance that’s as flexible and responsive as they are.
That's why we built iwoca. Our smart technology, data science and five-star customer service ensures business owners can act with the speed, confidence and control they need, exactly when it's needed.
We’ve already cleared the way for 100,000 businesses with more than £4 billion in funding. Our passionate team is driven to help even more SMEs succeed, through access to better finance and other services that make running a business easier. Our ultimate mission is to support one million SMEs in their defining moments, creating lasting impact for the communities and economies they drive.
The team
The Ledger Platform team owns the ledger across all of iwoca's products, from credit cards to our lending range, plus everything around it: reconciliation, financial reporting, and the data Finance, Accounting and Capital Markets run on. We work closely with a Product Manager, shipping frequently and owning our systems in production. Some of the team work fully remotely and others are hybrid, working 1-3 days per week in the London office.
The role
We’re looking for a Senior Back-End Engineer
This role is a chance to tackle complex, high-impact challenges at the heart of our fintech platform. You will join the team that owns iwoca's ledger — the system of record for the money we lend and collect — and you will be responsible for scaling it across the full lifecycle of our credit card and lending products, building the reconciliation and reporting that prove it correct, and laying the foundations for our next generation of products. This is a hands-on role: you'll design these systems, write the code, and own them in production.
The Company
Small businesses move fast. Opportunities often don’t wait, and cash flow pressures can appear overnight. To keep going, and growing, SMEs need finance that’s as flexible and responsive as they are.
That's why we built iwoca. Our smart technology, data science and five-star customer service ensures business owners can act with the speed, confidence and control they need, exactly when it's needed.
We’ve already cleared the way for 100,000 businesses with more than £4 billion in funding. Our passionate team is driven to help even more SMEs succeed, through access to better finance and other services that make running a business easier. Our ultimate mission is to support one million SMEs in their defining moments, creating lasting impact for the communities and economies they drive.
The team
The Ledger Platform team owns the ledger across all of iwoca's products, from credit cards to our lending range, plus everything around it: reconciliation, financial reporting, and the data Finance, Accounting and Capital Markets run on. We work closely with a Product Manager, shipping frequently and owning our systems in production. Some of the team work fully remotely and others are hybrid, working 1-3 days per week in the London office.
The role
Responsibility and Autonomy:
- Lead the delivery of projects involving many stakeholders and systems.
- Go beyond the code to develop deep expertise in our domain — our core financial products and our stakeholders' needs — and become a trusted technical advisor to the business.
- Perform detailed technical scoping and prototyping to support feasibility testing and decision making.
- Architect and implement scalable solutions for complex challenges: the lifecycle of an account, interest and repayment allocation, reconciliation, and how financial data reaches our reporting stack.
- Use domain modelling to find the simple design behind a complicated problem, and structure software so that it is easy to understand, test and evolve.
- Be pragmatic about which parts of a problem actually need solving now. The hardest work here is deciding what not to build.
- Build solutions that avoid single points of failure, and make sure our releases happen with zero downtime.
- Translate ambiguous product requirements into clear, actionable technical plans that guide the team's work.
- Promptly investigate and fix live issues, and ensure they do not resurface. Own what you ship in production and keep it reliable and easy to operate.
- Contribute high-quality, production-ready code and foster a collaborative environment by reviewing work and writing useful documentation.
- Work with the team to improve our development and agile practices and raise our engineering standards.
- Share new approaches and tooling with the wider engineering group through our internal forums and company-wide talks.
- We're pushing hard on AI-assisted development. Engineers here write clear technical specs, let skills and agents implement boiler-plate, and hold a high bar on code review — the person, not the model, is accountable for what merges. We expect AI output to be validated for correctness, performance and security like any other change.
Essential:
- Extensive back-end engineering experience.
- Experience building and running microservices and distributed systems in production. Comfortable reasoning about durable cross-service communication, transactional correctness, and failure modes at scale.
- Extensive experience with relational databases, ideally PostgreSQL, but open to MySQL or similar (e.g., MS SQL, Oracle); emphasis is on data integrity.
- Experience with systems where correctness is a hard requirement — ledgers, accounting, billing or payments, ideally in a regulated setting — including the invariants, immutable audit trails and reconciliation controls that enforce it.
- Experience leading a feature or project end to end — scoping, design, delivery, and running it in production.
- You use AI (like Cursor, Claude Code or similar) in your daily flow - whether for work or for fun. You use it to blast through boilerplate and research, so you can focus on the hard parts: complex architecture, rigour, and high-stakes decision-making.
- A strong technical or mathematical foundation, evidenced by a degree in a quantitative field (Computer Science, Engineering, Physics, Maths or similar) or equivalent professional experience.
- You work well as a peer: pairing on hard problems, giving useful code review, and unblocking teammates day-to-day.
- Clear written and verbal communication — you can explain a technical trade-off to Finance, and a business constraint back to engineers.
- A background in high-logic or high-scale fields like Fintech, Gaming, Healthcare Tech, Logistics, Security/Cryptography or similar.
- Working knowledge of modern data tooling - ideally Snowflake and dbt - used to build analytical or reporting pipelines.
- Knowledge of messaging frameworks and event-driven patterns (e.g. Kafka).
The salary
We expect to pay from £80,000 to £110,000 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, the best idea wins. We model our culture on independent thinking, challenging untested logic, and evidence-based decisions. We prioritise learning and growth, and give people the autonomy to develop in the direction that makes them most effective.
We're a tech company and believe in the power of AI to help us work faster and better. We provide the infrastructure where every iwocan always has access to the best models and where those models have access to all of our data. We will help our people to learn how to use and grow with the new tools available to them.
The offices
We put a lot of effort into making iwoca a great place to work:
We expect to pay from £80,000 to £110,000 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, the best idea wins. We model our culture on independent thinking, challenging untested logic, and evidence-based decisions. We prioritise learning and growth, and give people the autonomy to develop in the direction that makes them most effective.
We're a tech company and believe in the power of AI to help us work faster and better. We provide the infrastructure where every iwocan always has access to the best models and where those models have access to all of our data. We will help our people to learn how to use and grow with the new tools available to them.
The offices
We put a lot of effort into making iwoca a great place to work:
- Offices in London, Leeds, Berlin, and Frankfurt with plenty of drinks and snacks.
- Events and community-led groups, including running groups, padel, and monthly ping-pong and pool competitions.
- Flexible working hours.
- 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 per year, 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 external counselling and therapy sessions for team members that need emotional or mental health support.
- 3% Pension contributions on total earnings.
- An employee equity incentive scheme.
- Generous parental leave and a nursery tax benefit scheme to help you save money.
- A learning and development budget for everyone.
- Company-wide talks with internal and external speakers.
- Access to learning platforms like Treehouse.
- iwoca benefits & policies
This description is the source posting as it read when we added it. We are not affiliated with iwoca, so check their own site for the current details.
Where this offer sits in the market
SOC 2134 · UK · ONS ASHE 2025 · ~343k in sampleP25 £42kP75 £76k
£33kmedian £57kgoing rate £55k£103k
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Does this job guarantee visa sponsorship?
Not necessarily. iwoca holds a sponsor licence, but sponsorship for a specific hire is always the employer's decision. Be upfront in your application that you'll require it.
What salary is needed for this role to be eligible?
The offer must clear both the general threshold and the SOC 2134 going rate of £54,700. New-entrant and shortage discounts can lower it.