Senior front end javascript Work, Jobs in Chiswick (with Salaries)

Senior Software Engineer
Shieldpay —London
- Hybrid work
- SQL
- AWS
- JavaScript
- Flexible schedule
Quick apply
5d
Senior Software Engineer, Full Stack, Publisher Optimization
Google —London
- Doctoral degree
- Computer Science
- Java
5d
Software Engineer - Java
Millennium Management —London
- Computer Science
- DevOps
- Engineering
10d
Senior Lead Software Engineer - React Native
JPMorganChase —London
- Full-time
- English
- JavaScript
- APIs
Full Stack Engineer Tech - Development · London
Dare International —London
- Full-time
- Java
- JavaScript
- APIs
- Gym membership
FullStack Solution Architect (Exp in RFP/RFI) - London, UK - Fulltime - Hybrid
Capgemini —London
- Hybrid work
- Azure
- DevOps
- Java
Senior Developer Experience Writer
Ably —London
- Remote
- JavaScript
- APIs
- AI
- Annual leave
Technical Lead, Developer Experience
Ably —London
- Remote
- JavaScript
- APIs
- Leadership
- Annual leave
Senior Software Engineer, Trading Platform GUI
DRW —London
- JavaScript
Senior/Staff Design Engineer
AlphaSense —London
- Remote
- Computer Science
- Bachelor's degree
- JavaScript
FullStack Solution Architect (Exp in RFP/RFI) - London, UK - Fulltime - Hybrid
Capgemini Sogeti —London
- Hybrid work
- Azure
- DevOps
- Java
Senior Tech Lead - UK
Horizontal Digital —London
- Hybrid work
- Azure
- Master's degree
- AWS
Quick apply
Senior ML Software Developer (Brahma AI - A DNEG Dedicated Unit of Brahma)
DNEG —London
- C++
- JavaScript
- Scripting
Principal Engineer - Technical Lead (Gen AI and MACH Architecture)
AKQA —London
- Hybrid work
- Azure
- System design
- Master's degree
Agentic / GenAI Consultant / Senior Consultant
Capgemini Sogeti —London
- Hybrid work
- Azure
- Master's degree
- SQL
Principal Accessibility Specialist, Amazon Experiences and Upskilling
Amazon UK Services Ltd. —London
- Full-time
- Project management
- Bachelor's degree
- JavaScript
Senior Product Engineer
Intercom —London
- Hybrid work
- AWS
- Machine learning
- JavaScript
- Annual leave
- Work from home
Senior Full-Stack Cloud Native Developer (OTC Team), Charles River Development, Assistant Vice President
State Street —London
- Full-time
- Azure
- Computer Science
- Engineering
QE AI Lead Engineer
NTT Data UK —London
- Azure
- Oracle
- Java
Senior Tech Lead - UK (German-speaking)
Horizontal Digital —London
- Hybrid work
- Azure
- Master's degree
- AWS
Quick apply

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Senior Software Engineer

Shieldpay
London

Quick apply

Job details

5 days ago

Benefits

Flexible schedule

Qualifications

ASP.NET
C#
Microsoft SQL Server
.NET
SQL
AWS
JavaScript
APIs
IT
TypeScript
Entity Framework
jQuery

Full job description

Impact and Responsibilities

We are seeking a Senior Software Engineer who thrives on untangling complex systems and modernising core infrastructure without breaking production. This is an exciting opportunity to modernise core C#/SQL systems! Extract legacy business logic, build clean services, and verify changes in shadow mode with zero downtime to revenue flows.

Extract business rules scattered across C#, embedded JavaScript and undocumented SQL stored procedures into a clean, tested, dependency-free rules assemblies.
Build new services cleanly. with proper Dependency Injection (DI), robust authentication / authorization, structured logging, and full observability.
Work fluently across both legacy .NET Framework 4.8 (ASP.NET MVC5, WebAPI 2, EF6) and modern .NET, as both will coexist for the whole transition period.
Navigate across the multiple existing systems such as the API façade, the ETL pipeline, the SNS/SQS event bus, since neither system is self-sufficient and most real bugs live in the coupling, not one side.
Deploy changes using shadow-mode verification (compute, log, and compare against legacy outcomes without writing) until equivalence is rigorously proven.
Refactor and optimise heavy SQL Server stored procedures and backend logic with total precision ensuring client-money correctness is never compromised.

What we're looking for in you

Senior-level, hands-on experience in modern .NET (.NET 6+) paired with deep, comfortable familiarity with legacy .NET Framework 4.8 (ASP.NET MVC 5, WebAPI 2, Entity Framework 6). We need someone who respects the legacy code and is happy working in it today.
High proficiency in reading, understanding, and safely refactoring complex, stored-procedure-heavy database logic.
Working proficiency in JavaScript/TypeScript. You’ll be interacting with both jQuery on the legacy .NET front end and modern TypeScript microservices on our sister platform.
A strong "legacy technology" instinct over a "rewrite everything" approach. You favour stability, predictability, and incremental progress over shiny trends.
Experience or comfort with golden-master testing, diffing, and shadow verification to mathematically/logically prove equivalence to legacy outputs.
The ability to hold two disparate architectures in your head at once and reason through their edge cases, data flows, and coupling points.

Nice-to-Haves

Hands-on experience with AWS Lambda, SQS, SNS, and RDS.
Comfort operating alongside an in-house AI-agent orchestrator that supports and automates parts of our SDLC.

Our Promise: Shieldpay is an equal opportunities employer. For Shieldpay building a fair and transparent workforce begins with the recruitment process that does not discriminate on the grounds of gender, sexual orientation, pregnancy or maternity, gender reassignment, race, colour, nationality, ethnic or national origin, religion or belief, disability or age. We offer flexible working options, such as flexible hours and hybrid work, to support our employees' work-life balance

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Refine Your Search

senior front end javascript jobs in chiswick

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