Senior C# Developer Placement — Financial Software House to Retail Banking

£65K - £75K

London

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The Client

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A well‑established financial software house supplying critical software solutions across capital markets, loan servicing, and operational banking. Following the expansion of their product suite into the retail banking sector, they needed to increase their in‑house engineering capability to support a major new project:
a modern mortgage origination system for a leading UK retail bank.

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The Challenge

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The technical brief required deep, specialised expertise:

• Senior‑level C#/.NET engineering skills

• Direct experience building mortgage origination or retail banking workflow engines

• Understanding of regulatory, security, and audit constraints in consumer lending

• Ability to work in a hybrid environment — bridging legacy banking systems with modern cloud‑first architecture

The biggest challenge was the scarcity of developers with both high‑end C# engineering capability and practical experience in retail mortgage systems.

Most strong C# engineers came from fintech, SaaS, or general enterprise backgrounds — not the retail mortgage domain. Conversely, candidates with mortgage‑specific experience often lacked the high‑level engineering skills required for building scalable, modern banking platforms.

 

Our Approach

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Taking inspiration from our structured in-house hiring methodology, we executed a targeted, multi‑stage search strategy:

1. Precision Role Definition

We collaborated with the client’s Solutions Architect and Head of Engineering to separate domain‑essential experience from domain‑trainable experience.
We defined three non‑negotiables:

• Proven senior‑level C#/.NET engineering

• Experience building high‑throughput, rules‑driven workflow or decisioning systems

• Ability to interpret mortgage‑specific requirements (KYC, affordability, credit risk, packaging, offer generation)

2. Market Mapping & Passive Talent Targeting

We mapped candidate pools from:

• Retail banks with modernised digital lending systems

• Specialist mortgage lenders using custom‑built origination platforms

• Vendors supplying LOS (Loan Origination System) solutions

• Fintechs focused on credit decisioning and consumer lending

We then crafted tailored outreach messaging focused on:

• Greenfield architecture opportunities

• The client’s shift into mainstream retail banking

• The ability to influence core system capabilities from day one

3. Technical & Domain‑Specific Assessment

Shortlisted candidates underwent:

• A C#/.NET deep dive including multi‑threading, APIs, microservices, and cloud readiness

• A domain interview exploring experience with mortgage workflows, packaging steps, decisioning engines, and compliance flows

• A system design exercise modelling a simplified origination pipeline

This guaranteed that every candidate presented was both one of the strongest available engineers and someone who could operate in a retail lending context.

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The Result

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Within three weeks, we presented four fully qualified candidates, all with genuine retail banking or mortgage‑origination credentials.

The client hired a Senior C# Developer who:

• Had previously delivered decisioning microservices for a challenger bank

• Brought hands‑on experience with affordability models, credit policy logic, and offer generation modules

• Integrated seamlessly into the engineering team and became a key contributor to the mortgage platform from sprint two onward

 

Impact

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The successful hire enabled the client to:

• Accelerate the delivery of the first release of their new mortgage origination engine

• Reduce dependency on external contractors

• Improve domain knowledge within the internal engineering team

• Strengthen their credibility with their retail bank customer by demonstrating strong in‑house capability

 

Client Feedback

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"The challenge wasn’t just finding a strong developer — it was finding one who actually understood mortgage origination. The shortlist was excellent, and the candidate we hired has already made a significant impact."
— Head of Engineering, Financial Software House