Junior Developer (.NET/React) in London

Department: Technology

Employment Type: Permanent

Location: London, UK

Reporting To: Engineering Manager

Description

We see a world where we all contribute to a thriving planet and together, we are a collective force for good. Planet Mark is a sustainability certification which recognises outstanding achievements, encourages action, and builds an empowered community of like‑minded individuals. We work with businesses to rigorously measure their carbon footprint and social value, engage their staff and supply chain to unlock their knowledge and drive passion for change, and communicate their progress to build a positive brand. We help businesses put a purpose at the heart of their organisation that brings social, environmental, and economic considerations together.

What that means day to day

• Development & Learning: Contribute to the development of back‑end services using .NET Core and front‑end components using React, with support and guidance from senior engineers.
• Architecture Collaboration: Work closely with senior engineers and the architecture team to understand and implement established technical direction and best practices, particularly within a greenfield project.
• AI‑Assisted Engineering (Core Expectation): Actively use GitHub Copilot as part of day‑to‑day development. Learn how to effectively leverage AI to improve coding speed, quality, and problem‑solving, and adopt best practices for AI‑assisted workflows.
• DevOps Practice: Support the use of Azure DevOps, including working with pull requests and contributing to CI/CD pipelines.
• Database Management: Assist in designing and maintaining MongoDB schemas and queries under guidance.
• Integration Support: Support integration work with Microsoft Dynamics CRM and other APIs.
• Code Quality & Learning: Write clean, testable code and participate in code reviews, learning from feedback and ensuring AI‑assisted outputs meet quality and security standards.

What you’ll need to be successful

Essential Criteria (Must‑Haves)

• Foundational Development Skills: Good understanding of C# and the .NET framework (ideally .NET Core / .NET 6+), either through commercial experience, education, or personal projects.
• Front‑End Fundamentals: Some experience or strong interest in building modern web applications using React (or similar frameworks).
• Willingness to Learn: Eagerness to learn from senior engineers and collaborate across teams, including architecture.
• AI Tooling Mindset: Interest or early experience in using GitHub Copilot (or similar tools), with enthusiasm to adopt AI‑assisted development practices as a core way of working.
• API Basics: Understanding of RESTful APIs and how to consume them.
• Database Awareness: Basic knowledge of databases, ideally with some exposure to MongoDB or other NoSQL technologies.
• Team Collaboration: Strong communication skills and the ability to work effectively as part of an agile team.

Desirable Criteria (Nice‑to‑Haves)

• CRM Exposure: Awareness or experience with Microsoft Dynamics CRM.
• Cloud Fundamentals: Basic understanding of cloud platforms such as Microsoft Azure or AWS.
• DevOps Exposure: Some familiarity with Azure DevOps or similar tools for source control and pipelines.

What you'll get in return

We have a hybrid workplace policy, where you will work from the office 2‑3 days per week. Our office is located at 39 Tabernacle St, London EC2A 4AA, United Kingdom. We emphasize providing many ways to support our team to do their best work and below are some of the perks and benefits we offer:

• Enhanced Parental Leave
• Generous annual leave, with the option to buy and sell additional days
• Healthcare Plan
• Annual Giving Day – an extra day to give back to yourself or your community
• Cycle‑to‑work Scheme
• Electric Vehicle Scheme
• Pension scheme with employer contributions
• Life Assurance – 3X base salary
• Rewards Program – access to discounts and cashback
• LinkedIn Learning License for upskilling & development

We are proudly an equal‑opportunity employer. We are committed to ensuring that no candidate is discriminated against because of gender identity and expression, race, disability, ethnicity, sexual orientation, age, colour, region, creed, national origin, or sex. We are dedicated to growing a diverse team while continuing to create an inclusive environment where everyone feels safe and empowered to be themselves.

We’ll respond to your application within 15 working days. An interview process will consist of an initial discovery call with a recruiter, a first‑stage interview via Microsoft Teams and an additional interview (likely face‑to‑face) with stakeholders you’ll be working with closely in the role. If you need us to make any adjustments, please let us know.