Integrations Engineer (C#)

Oak Engage; North East; Hybrid; GBP 45,000 - 65,000; Full time

Job summary

A leading enterprise SaaS company is seeking an Integrations Engineer (C#) to build and maintain external integrations. This role, based in Newcastle or remote, requires 3–5+ years of C# experience, strong API skills, and problem-solving ability. Join a mission-driven team and enjoy flexible working arrangements, private health insurance, and a generous holiday policy.

Benefits

Private health insurance

Life insurance

Gym contribution

Travel allowance

Generous holiday policy

Qualifications

• 3–5+ years of experience with C# and .NET.
• Strong experience working with APIs and authentication flows.
• Knowledge of secure data handling and enterprise integration patterns.

Responsibilities

• Develop secure integrations with third-party systems.
• Collaborate with teams for integration support.
• Maintain integration documentation and troubleshoot issues.

Skills

C#

.NET Core/.NET 6+

APIs

Authentication protocols (OAuth, SAML)

Problem-solving

Communication skills

Tools

Azure

Workday

SAP

Job description

Location: Hybrid, Newcastle or Remote (UK Based)
Reports to: Head of Engineering
Type: Full-time

Join Oak Engage – Where Communication Meets Connection

At Oak Engage, we’re on an exciting growth journey—backed by a major investment from NorthEdge to scale our impact and redefine the future of employee engagement. Trusted by some of the UK’s biggest brands, including Aldi, Five Guys, and ITV, we help organisations connect, engage, and empower their people through smarter, more personalised internal communication. With our next stage of expansion underway, we’re building a team of bold, ambitious thinkers ready to make their mark at a high-growth, purpose-driven SaaS company. If you’re looking to shape the future of work and grow alongside a company that’s going places, now’s the time to join Oak.

About the Role

We’re looking for a skilled Integrations Engineer (C#) to build and maintain the external integrations that power Oak’s platform. You’ll be working on everything from HRIS and identity integrations to bespoke APIs and third-party system connectors—helping our customers connect Oak seamlessly into their existing tech stack.

This is a hands-on role ideal for someone who enjoys working with APIs, data mapping, authentication flows, and solving real-world integration challenges in enterprise environments.

What You’ll Do

• Develop and maintain secure, scalable integrations between Oak and third-party systems (e.g. Azure AD, Workday, SAP, custom APIs)
• Collaborate with customer success and implementation teams to support integration requirements
• Own authentication flows (OAuth2, SAML, etc.) and integration-specific APIs
• Maintain integration documentation and configuration guides
• Troubleshoot and resolve integration issues across customer environments
• Build reusable components and tools to streamline future integrations
  

What We’re Looking For

• 3–5+ years of experience with C# and .NET (preferably .NET Core/.NET 6+)
• Strong experience working with APIs, webhooks, and authentication protocols (OAuth, SAML)
• Knowledge of enterprise integration patterns and secure data handling
• Experience with Azure services and identity providers a strong plus

• Great problem-solving and communication skills, especially in customer-facing scenarios
  

Why Join Oak?

• A meaningful role in a mission-led SaaS company with strong growth and product-market fit
• The chance to work with household brands and solve real-world enterprise challenges
• Flexible hybrid or remote working options
• Private health insurance, life insurance, and Employee Assistance Programme (EAP)
• Gym contribution and travel allowance
• Enhanced maternity, paternity, and discretionary leave
• Generous holiday policy (25 days + Bank Holidays + additional discretionary days)
• Regular team socials and a positive, collaborative culture

Our Recruitment Process

Hiring Manager Interview

• Deep dive into architecture, problem-solving, and team contributions
• Assess communication and curiosity

Technical Task or Live Pairing

• Realistic, time-bound task or live coding session
• Use structured rubric for fairness (avoid freeform “whiteboarding”)
• "Focus on team collaboration, code quality, and feedback"

Peer Technical Panel/Culture Fit / CTO Chat - In person at our NCL HQ

• Includes cross-functional devs, product manager or designer
• Assess long-term growth potential and alignment with tech principles
• Opportunity for candidate to ask strategic questions

Equality & Diversity at Oak

At Oak, we’re committed to building a diverse and inclusive workplace where everyone feels welcome, supported, and able to thrive.

We believe that different perspectives make us stronger, and we actively encourage applications from people of all backgrounds, experiences, and identities — including, but not limited to, race, ethnicity, gender, age, disability, sexual orientation, and socio-economic status.

We are an equal opportunities employer. All hiring decisions are based on business needs, role requirements, and individual qualifications — without bias or discrimination.

If you require any adjustments to the interview process or the role itself to support accessibility, please let us know — we’re happy to help.