Job Description

Date Posted: 25/06/2025


Location: London


Job Type: Full time

Senior Application Support Engineer

London - Hybrid 50%

Full Time - 35 hours

Who are Just?

We help people achieve a better later life. That's our purpose and it's the reason we exist. We are a fast-growing FTSE 250 company helping customers enjoy the retirement they deserve. We do this through a variety of market leading, award-winning products and services, delivered by a diverse team of over 1,400 purpose-led colleagues who genuinely put the customer at the heart of everything we do.


This is a brilliant time to join our business. We are on an exciting growth journey to become the UK's most loved retirement expert.

Purpose

As a Senior Application Support Engineer, you will play a crucial role in powering our Retail applications by partnering with engineering and business teams to build deep technical and business expertise. You'll be the go-to expert across a diverse, modern, and complex technology landscape, ensuring seamless support and smooth operations.


You'll take charge of incident triage and resolution, lead system upgrades, and keep performance optimized through proactive monitoring and alerting. Beyond day-to-day support, you'll drive continuous improvements in processes and tools, collaborating with stakeholders to elevate operational excellence and keep our applications healthy and resilient.

Key Accontabilities

Incident Management & Triage:

Investigate and resolve incidents across multiple applications, ensuring minimal downtime and quick root cause analysis. Own and actively manage incidents with regular follow-ups until resolution. Identify root causes and take ownership to deliver lasting solutions that drive business value. Collaborate with engineering teams to troubleshoot and resolve application and infrastructure-related issues. Oversee major incidents and work alongside developers and operations teams to restore service.

Proactive Application Support & Maintenance:

Ensure the ongoing stability and health of all applications through regular maintenance tasks, including patching and updates. Plan and execute minor upgrades and configuration changes with minimal impact to the production environment. Maintain and optimise system configurations across legacy and modern applications to ensure their continued performance and reliability.

System Monitoring & Performance:

Maintain and improve logging, monitoring, and alerting systems. Define service-level objectives and indicators for business applications. Continuously review performance metrics against SLO/SLIs and proactively address performance bottlenecks or underperforming systems. Manage system health checks, review logs, and act on warnings to avoid potential disruptions.

Collaboration & Communication:

Provide regular updates to Technology leadership members and key business stakeholders. Work alongside Engineering teams to enhance system resilience, focusing on high-availability, scalability, and reliability. Support and contribute to the development of runbooks and knowledge sharing materials for the team.

Continuous Improvement & Documentation:

Contribute to the ongoing improvement of incident management processes, response times, and issue resolution. Maintain detailed incident reports, root cause analyses, and post-incident reviews. Document technical processes, troubleshooting procedures, and maintenance guidelines to support efficient operations.

Experience

Proven experience in a support engineering role within financial services or a similarly regulated environment is essential. Strong hands-on experience with a broad range of technologies, including:

Microsoft Technologies:

C#, VB, .NET Core, Azure, SQL Server, IIS, Windows Server

Web Technologies:

React, RESTful APIs, Docker, Azure Kubernetes Service (AKS)

Cloud & Infrastructure:

Azure, CI/CD pipelines (Azure DevOps), Docker, Kubernetes

Third-Party Tools:

Apigee, Dynatrace, Okta, Git
Practical experience with performance monitoring tools such as Dynatrace or equivalent.

Skills & Knowledge

Solid understanding of Site Reliability Engineering (SRE) principles, including incident management, monitoring, alerting, and performance tuning. Strong knowledge of Software Development Lifecycle (SDLC) processes. Familiarity with incident management platforms like ServiceNow, PagerDuty, or similar tools. Excellent analytical and problem-solving abilities with a focus on delivering timely and effective solutions. Outstanding communication skills, capable of collaborating across diverse, cross-functional teams.

Desirable

Experience working with legacy VB and C# applications within a modernised environment. Knowledge of Financial Services applications or retirement products (e.g., annuities, equity release) is advantageous. Experience with automation and scripting to improve manual processes (e.g., PowerShell, Bash). Familiarity with agile methodologies and experience working in DevOps/SRE-driven environments.

Company Benefits

A Competitive Salary, Pension Scheme and Life Assurance Along with 25 Days Annual Leave plus an Additional Day on us for your Birthday Private Medical Cover and Income Protection, just in case A generous and highly achievable bonus scheme - paid annually based on individual and company performance against targets Opportunity to progress within your career both in-role and within the company FREE access to the Headspace App, a 24/7 Employee Assistance Helpline and Trained Physical & Mental Health First Aiders (On-Site) A variety of Employee Funded Benefits available to you via our Online Benefits Portal Plus, several additional purchase options available for you and your loved ones

Why Just?

At Just you'll have the opportunity to develop your career, whilst making a difference to the lives of those around you. You'll be part of a company with a strong and distinctive culture - we're ambitious, curious and collaborative - and every decision we make centres around being Just and delivering the best outcomes for our customers.


We're committed to building a more sustainable business, and we're working hard to make progress against our Net Zero targets. We're reducing our reliance on fossil fuels in our offices, switching to more sustainable sources of energy and we're investing more of our money in green and social assets.


Valuing diversity of thought and fostering a sense of belonging is critical to our business success, driving innovation and balanced decision making. Our work on DEIB (Diversity, Equity, Inclusion and Belonging) aims to deliver a brilliant employee experience underpinned by a sense of belonging, where our people feel proud to work at Just. We remain committed to our publicly disclosed HM Treasury Women in Finance Charter and Race at Work Charter targets and support a wide range of employee network and events, championing issues including intergenerational working, social mobility and neurodiversity.


Be Bold. Be Brilliant. Be Just.

At Just we encourage a flexible and agile working environment for the majority of our opportunities. Get in touch with us to discuss in more detail.