Senior Application Support Engineer

Date Posted: 25/06/2025

Location: London

Job Type: Full time

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Senior Application Support Engineer

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.

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