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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Application Engineer - **Company:** Janus Henderson - **Location:** London, UK - **Experience:** Experienced - **Contract:** Permanent contract - **Skills:** ASP.NET, .NET Framework, Application Performance Management, JIRA, User Authentication, Unit Testing, Microsoft Azure, Batch Files, C Sharp (Programming Language), Continuous Integration, Dependency Injection, Middleware, Microsoft SQL Server, Commercial Software, Release Management, Mockito, Software Systems, SQL Databases, TypeScript, Snowflake, Git, AngularJS, Software Coding, Restful APIs, Terraform, Angular Ui, Dynatrace, Serverless Computing, Key Vault, Servicenow - **Published:** October 24, 2026 - **Apply:** https://dejobs.org/x/x/A4F6A9867F0A47C6863896929FE57F13/job/ ## About the Role * Around 2-6 years of commercial software engineering, with strong C# and .NET (.NET 6/8 or equivalent recent experience). * Solid ASP.NET Core: dependency injection, configuration, middleware, authentication, and correct use of async/await. * Competent SQL - able to write and tune queries, and to reason about data models. * Genuine testing discipline: unit testing and mocking as a normal part of writing code, not an afterthought. * Practical Git and CI/CD experience; comfortable with branching, pull requests and automated build and release pipelines. * Working knowledge of a major public cloud, ideally Azure. * Able to read unfamiliar code and work safely in a large existing codebase. * Clear written and verbal communication with non-technical colleagues . Nice to Have Skills * Azure Functions (isolated worker), Service Bus or Event Grid, Key Vault. * Angular and TypeScript, particularly with ag-Grid or PrimeNG. * Terraform or another infrastructure-as-code tool. * Snowflake, or cloud data warehousing generally. * Financial services background, especially asset management, trading or capital markets. * Exposure to any of Charles River, Aladdin or Bloomberg. ## Description * Work closely with the JHI business users, team and IT product owners to develop business solutions and add business value through software solutions. * Collaborate with Architects and Tech Leads, ensuring that all solutions fit well within the strategic architectural vision. * Deliver and support production services across the Trading estate. Writing the code, the tests, the infrastructure and the pipeline changes that take a piece of work from a Jira ticket to a running service used by traders and portfolio managers. You will work within an established architecture and quality bar rather than defining it, and will grow into ownership of individual components * Work in an agile team, contributing to team velocity, ideation and success! * Assist in mentoring junior staff where appropriate, promoting a positive company culture. * Opportunity to grow your skills base, being included in forward thinking R&D and innovation toward JHIs goals. * Work within a progressive company committed to DEI goals. * Carry out other appropriate duties as assigned What to expect when you join our firm * Hybrid working and reasonable accommodations * Generous Holiday policies * Paid volunteer time to step away from your desk and into the community * Support to grow through professional development courses, tuition/qualification reimbursement and more * All-inclusive approach to Diversity, Equity and Inclusion * Maternal/paternal leave benefits and family services * Complimentary subscription to Headspace - the mindfulness app * Corporate membership to Wellhub and other health and well-being benefits * All employee events * Lunch allowance for use within subsidized onsite canteen (UK Only), * Deliver features and fixes end to end: C# service code, Angular UI where relevant, Terraform, pipeline configuration and deployment through to production. * Build and maintain integrations with vendor trading platforms (Charles River, Aladdin, Bloomberg and others) via REST APIs, event subscriptions and batch file feeds. * Work within the ports-and-adapters structure - keeping domain logic free of vendor and infrastructure concerns and confining external dependencies to adapters. * Write unit and integration tests sufficient to meet the enforced coverage gates and treat analyzer findings as defects rather than noise. * Author and maintain Snowflake and SQL Server migration scripts following the established versioned/repeatable conventions. * Support the services you build investigate production issues using Application Insights and Dynatrace, participate in the support rota, and carry out root-cause fixes. * Review colleagues' pull requests constructively and respond to review of your own. * Keep change traceable - accurate Jira references and correct ServiceNow change records for production releases. * Contribute to incremental modernisation of legacy components as functionality is migrated onto the current platform.