Senior Software Developer at Once For All in Basingstoke, England, United Kingdom | Kablio

Role

Description

emerging tech

solution design

code review

high availability

microservices

azure cloud

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.

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

Requirements

azure

c#

sql server

microservices

docker

kubernetes

Tech Stack You’ll Work With

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

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

Benefits

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

Training + Development

Information not given or found

Interview process

Information not given or found

Visa Sponsorship

Information not given or found

Security clearance

Information not given or found

Company

Overview

Born from a merger of specialist UK and French compliance firms, Once For All unified under a single platform headquartered in Paris.
Backed by private equity firms GTCR and previously Warburg Pincus, the company has grown through strategic acquisitions.
It delivers a SaaS network matching contractors with vetted suppliers, leveraging AI to streamline tendering, compliance and ESG risk.
Typical projects involve large main contractors in Europe needing pre-qualified subcontractors for construction, facilities or utilities work.
Its platform supports complex workflows — from health & safety checks to legal document validation — across multiple national schemes.
Once For All stands out for managing one of the largest proprietary ESG and compliance datasets in the built environment.
Its reach spans the UK, France, Belgium, Germany and Italy, with pan-European capabilities in energy, building and property sectors.
A standout fact: it powers specialist schemes like Constructionline, Actradis, BidWork and RISQS under one umbrella.

Culture + Values

Environment + Sustainability

0% Plastic Packaging

Sustainability Achievement

Awards were won for redesigning packaging to eliminate plastic while maintaining product protection.

2,500 Tonnes

Recycled Materials

Recycled plastics were processed, contributing to a circular economy.

2.1 Million

Refurbished Units

Remote control units were refurbished, reducing electronic waste.

Commit to continuously review and improve environmental footprint of products, production, and supply chain.
Eliminate single-use plastics by using 100% recyclable paper and pulp trays across most product packaging with minimal protective film.

Inclusion & Diversity

Articles

Contact

Our Network / What We Provide

Building & Facilities Management

Demonstrate Compliance

Role

Description

emerging tech

solution design

code review

high availability

microservices

azure cloud

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

Requirements

azure

c#

sql server

microservices

docker

kubernetes

Tech Stack You’ll Work With

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

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

Benefits

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

Training + Development

Information not given or found

Interview process

Information not given or found

Visa Sponsorship

Information not given or found

Security clearance

Information not given or found