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Proactis

Lead Security Architect

Hybrid

Reading, United kingdom

Senior

Full Time

29-01-2026

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Skills

Communication Leadership Adaptability Python SQL Architecture Enterprise Architecture Risk Assessment Team Spirit Azure .NET

Job Specifications

Lead Security Architect

Location: Reading | Hybrid

About the Role

As a Lead Security Architect at Proactis, you will be defining the security posture and strategy in coordination with the head of architecture and CTO that supports the technology strategy. This security posture and strategy will then impact all IT deliveries and ensures we are providing the best possible solutions to customers and the business while securing both from harmful interference.

You will then be working with technical architects, developers, data scientists and others across the business to make sure this posture is picked up and delivered through reviewing their and you creating designs for solutions.

Your Key Responsibilities:

Defining the security posture and strategy

Understand the current security controls and technologies, identifying strengths, weaknesses and missing items and then to deliver a multi-year plan that improves the current situation focussing on increasing customer and business security posture in a change and transformation setting.

Evangelise technology and security strategy

Work with all Stakeholders to make sure they are aware of the benefits these two strategies have and the value in conforming to them. When noticing an issue in either of these strategies then work with everyone to get the issue resolved as quickly as possible.

Support technical architecture

Support and mentor technical architects to uplift their abilities by either supporting them in creating solution designs or reviewing them to make sure they conform to strategic goals as well as best practice.

Solution design

Transformational programmes of work require a highly experienced architect to work with the business to understand the issue they are trying to solve, the options available and supporting decision makers on selecting a direction.

Secure by design

Work with others to make sure that all IT solutions have security included in their designs or legacy applications and whether mitigations are required. Work with others to explain the issues and why any measures are needed.

Threat modelling and risk assessment

Define the exploitable threats that our IT systems could encounter, which levels of risk those fall into based on the defined security posture and how it should be dealt with.

Support creation of policies, standards and best practices

Work the chief information security officer to make sure we have the right policies and how those would translate into solutions or team deliverables. Then oversee their implementations to ensure proper governance and acceptance.

What You’ll Bring

Essential Skills Criteria:

Over 5 years’ experience as a software developer in a security domain. Security architect of more than 5 years or lead security architect with 3-5 years' experience in change or transformation envionments.
Technical Knowledge: Expert in .Net, SQL, Python, cloud specifically Azure, observability tools. TOGAF knowledge, enterprise architecture experience, system design experience, governance, working with on and offshore teams, mentoring others.
Communication Skills: Excellent verbal and written communication skills with the ability to effectively collaborate with cross-functional teams, present ideas, and influence stakeholders.
Leadership Skills: Proven leadership skills to drive product development, foster innovation, and motivate team members to deliver high-quality products.
Customer-Centric Approach: A customer-focused mindset with the ability to empathise with users and anticipate their needs to deliver exceptional product experiences.
Adaptability: Comfortable working in a fast-paced, dynamic environment with the ability to adapt to changing priorities and business requirements.

About Us

Proactis is a leading Source-to-Pay software solution provider, supporting a range of service-led industries. Our mission is to help organisations control their spend, manage their suppliers, and streamline their procurement processes. Our end-to-end modular platform enables customers to control spend and manage supply-chain risk; improve compliance and governance of their purchasing activities; reduce the cost of goods and services; and deliver efficiencies, all through process digitisation and automation.

What We Offer

Flexible work schedule, working hybrid from our Reading office
Private pension plan, with matched contributions
Enhanced maternity, paternity & adoption leave
Private medical insurance
Company health plan, including optical and dental cover
Volunteering days to give back to your community
Electric vehicle salary sacrifice scheme
A company guided by strong values and a collaborative team spirit

Diversity and Inclusion

At Proactis, we are committed to creating an inclusive workplace where everyone feels valued and empowered to succeed.

We are an equal opportunity employer and celebrate the unique perspectives of all people, regardless of gender identity, sexual orientation, race, ethnicity, age, rel

About the Company

Proactis is a leading Source-to-Pay software solution provider for service-focused organisations. Proactis’ end-to-end modular platform enables customers to control spend and manage supply-chain risk; improve compliance and governance of their purchasing activities; reduce the cost of goods and services; and deliver efficiencies, all through process digitisation and automation. Proactis’ value-led proposition is the perfect partner for your ERP to maximise wider control, visibility and efficiency. Our modular approach su... Know more