Senior Software Developer

Once For All Limited; Basingstoke; On-site; GBP 55,000 - 75,000; Full time

Job summary

A leading SaaS company in Basingstoke is seeking a Developer to design and implement a Supplier Risk Assessment platform. The ideal candidate has strong expertise in C# and SQL Server, experience with REST APIs, and familiarity with cloud-based infrastructure on Microsoft Azure. This role offers significant opportunities for personal and professional growth within a supportive environment.

Benefits

Private Medical Insurance

Pension

25 days holiday plus 8 bank holidays

Free tea/coffee/fruit

Ongoing CPD opportunities

Qualifications

• 5+ years commercial development experience required.
• Strong problem-solving and analytical skills.
• Proven background in scalable system design.

Responsibilities

• Design, build, and maintain cloud-native microservices and APIs.
• Lead the design and implementation of high-availability systems.
• Mentor and support developers through code reviews.

Skills

C#

SQL Server

REST APIs

DevOps practices

Agile methodologies

Microservices

Object-oriented programming

Education

Computer Science/Engineering degree

Tools

Microsoft Azure

Docker

Kubernetes

Git

CI/CD

Job description

About Once For All
Once For All is a high-growth, cloud-based SaaS subscription business helping customers manage supply chain governance, risk, and compliance. We serve 250k+ customers across the UK in 20+ sectors, including construction, transport, retail, hospitality, education, property management, manufacturing, and government.

Role Summary

Join our rapidly growing Development team (10 Agile SCRUM teams) building and scaling a suite of microservices-based applications on Microsoft Azure. You’ll play a critical role in the design, implementation, and innovation of Once For All’s next-generation Supplier Risk Assessment platform, ensuring scalability, security, and reliability.

Key Responsibilities

• Design, build, and maintain cloud-native microservices and APIs using C#, .NET, and SQL Server.
• Lead the design and implementation of high-availability, high-scalability systems hosted on Azure.
• Collaborate with product owners and stakeholders to translate requirements into technical solutions.
• Champion clean code, object-oriented design, and software engineering best practices.
• Contribute to a DevOps culture: CI/CD pipelines, Git workflows, Docker, and Kubernetes.
• Mentor and support developers through code reviews and technical guidance.
• Stay ahead of emerging technologies (Cloud, Open Source, DevOps, API economy, Big Data) and bring innovation to the team.

Required Skills & Experience

• Strong C# and SQL Server expertise with proven track record of delivering robust applications.
• Solid experience with REST APIs and modern API design.
• Proven background in scalable system design and high-availability architectures.
• Hands-on experience with Microsoft Azure and cloud-based infrastructure.
• Strong problem-solving and analytical skills with the ability to deliver under Agile methodologies.
• Deep knowledge of object-oriented programming, microservices, and message bus technologies.
• Familiarity with DevOps practices: Git, build pipelines, Docker, Kubernetes.
• 5+ years commercial development experience (Computer Science/Engineering degree preferred).

What We Offer

• Health & Wellbeing: Private Medical Insurance or wellness fund, 24/7 Employee Assistance Programme.
• Financial Benefits: Pension, Life Assurance (3x salary).
• Time Off: 25 days holiday + 8 bank holidays, holiday purchase scheme (+5 days), paid & unpaid volunteering days.
• Growth & Development: Ongoing CPD, team offsites, and company events.
• Everyday Perks: Specsavers eye-care voucher, free tea/coffee/fruit in Basingstoke office.

Tech Stack You’ll Work With

C#, .NET, SQL Server, REST APIs, Microsoft Azure, Docker, Kubernetes, Git, CI/CD, Microservices, Message Bus