Senior Software Engineer (Integrations)

MHR International UK Limited; Ruddington; Hybrid; GBP 60,000 - 90,000; Full time

Benefits offered by this job

Access to internal training courses

GP and mental health support

Extra holiday days

Family leave

MHRewards discounts

Recognition program

Referral bonus up to £2,000

Social events

On-site restaurants

Private medical insurance

Dental coverage

Job summary

MHR is seeking an experienced software engineer to lead complex integration challenges. You will own the design, development, and maintenance of integrations using Ruby, building and consuming REST APIs with JSON and XML, while enforcing strong security with OAuth and Basic Authentication.

You will work with Swagger/OpenAPI to design and document APIs, tackle data mapping and connectivity issues, and drive clean code, automated testing, and scalable engineering standards in an Agile environment.

Qualifications

• Experience with Ruby and hands-on integration projects.
• Strong ability to design, develop and maintain integrations.
• Experience building and consuming REST APIs with JSON and XML.
• Knowledge of API security and authentication (OAuth, Basic).
• Experience using Swagger/OpenAPI to design and document APIs.
• Good understanding of API and integration design principles.
• Commitment to clean, maintainable, well-tested code.
• Strong debugging and problem-solving skills in Agile teams.

Responsibilities

• Designing, developing and maintaining integrations using Ruby.
• Building and consuming REST APIs using JSON and XML.
• Implementing secure API authentication including OAuth and Basic Authentication.
• Working with Swagger/OpenAPI specifications to design, document and integrate APIs.
• Solving complex integration, data mapping and connectivity challenges.
• Driving clean code, automated testing and strong engineering standards.
• Improving scalability, reliability, security and maintainability.
• Leading technical discussions and influencing integration design decisions.
• Mentoring engineers and sharing technical knowledge across the team.

Skills

Ruby

REST APIs

JSON/XML

OAuth

Basic Authentication

Swagger/OpenAPI

Agile

Mentoring

Tools

Swagger/OpenAPI

Job description

At MHR, our employees are central to our success and play a key role in helping customers achieve sustainable high performance. With a team of over 900 professionals, we work to make things flow smoothly, whether it's for large organisations or individual employees. As businesses face rapid changes in the world of work, our team is here to help them adapt and thrive.

By focusing on the core needs of efficiency, productivity, growth, and impact, our employees use their expertise to deliver real solutions through our People and Finance platform. This system, which covers finance, HR, payroll, and learning, helps businesses run more smoothly and make better decisions in real time.

With over 40 years of experience behind us, MHR’s track record as a high-performance organisation is built on clear goals, a shared vision, and strong communication - all of which we pass on to our customers.

MHR is more than just a place to work; it’s a platform for empowerment. Joining us means bringing innovation, technology, and teamwork seamlessly removes obstacles, enhances your skills, and allow you to focus on what’s most important to you- work that matters.

With us, you’ll grow, find your flow , and make a lasting difference in your career, your team, and your impact.

This is an opportunity to take ownership of complex integration challenges and deepen your expertise in Ruby, APIs and integration architecture.

You’ll influence technical decisions, improve engineering standards and help evolve the way we design, build and maintain integrations across our products.

At MHR, we’ll support your continued development through knowledge sharing, mentoring and opportunities to expand both your technical and leadership capabilities.

Your Impact

You’ll design and deliver robust integrations that enable MHR products to communicate securely and reliably with external systems.

You’ll be responsible for:

Designing, developing and maintaining integrations using Ruby

Building and consuming REST APIs using JSON and XML

Implementing secure API authentication, including OAuth and Basic Authentication

Working with Swagger/OpenAPI specifications to design, document and integrate APIs

Solving complex integration, data mapping and connectivity challenges

Driving clean code, automated testing and strong engineering standards

Improving scalability, reliability, security and maintainability

Leading technical discussions and influencing integration design decisions

Mentoring engineers and sharing technical knowledge across the team

What You’ll Bring to MHR

You’ll be an experienced software engineer with strong hands‑on integration experience and the ability to take technical ownership of complex solutions.

Strong commercial software engineering experience, ideally including Ruby

Hands‑on experience building and consuming REST APIs

Strong knowledge of JSON and XML

Experience with API security and authentication, including OAuth and Basic Authentication

Experience working with Swagger/OpenAPI

Strong understanding of API and integration design principles

A focus on clean, maintainable and well‑tested code

Strong debugging and problem‑solving skills

Experience working in an Agile engineering environment

The ability to mentor other engineers and communicate technical concepts clearly

Benefits to support you personally and professionally

Alongside the opportunity to work with an incredible team and express your individuality, we offer a range of personalised benefits including:

• Access to over 60 internal training courses, professional qualifications, and cross‑departmental mentoring and coaching programs
• 24/7 access to a GP through Help at Hand for you and your family, confidential mental health support, and paid sick leave
• Ability to purchase or sell additional holiday days beyond 25 days and bank holidays
• Enhanced Family leave
• My MHRewards offering discounts at over 900 retailers
• Monthly employee recognition program and departmental awards
• Referral bonus scheme of up to £2,000
• Employee‑led social events such as running clubs, football teams, book clubs, and bake‑offs
• On‑site subsidised restaurants offering a variety of fresh meals daily
• Opt‑in benefits schemes such as private medical insurance and dental coverage

We value the well‑being, financial stability, and inclusivity of our employees, and strive to provide a supportive working environment.

At MHR, we’re completely committed to creating a supportive and inclusive workplace where all voices are heard, and everyone feels valued and supported.

Whatever your background, abilities and experiences, if you’re excited by this role we want to hear from you. If you require assistance for an interview, please let us know and we’ll make sure your needs are met when you arrive.

If we receive an exceptionally high volume of applications, we reserve the right to close this vacancy earlier than originally advertised.