Developer volunteer roles in London, greater london

Sensiblue

We disinfect water at the source using salt electrolysis to eliminate plastic waste and waterborne pathogens.

​Business Developer

Objective of the Role
You will be the engine behind our sales pipeline. Your main goal is to identify new market opportunities through desk research, execute active outreach, and successfully schedule qualified first meetings for the Sales Director.
 
Core Responsibilities

Desk Research & Market Mapping: Identify target niches worldwide (e.g., maritime suppliers, independent B2B water distributors, legionella prevention firms, NGO's, agriculture, RV market, hospitality) and map out key decision-makers.
 
Active Outreach: Reach out to prospective partners via phone (cold calling), LinkedIn, and tailored email campaigns to pitch Sensiblue’s unique value propositions.
 
Lead Qualification & Scheduling: Qualify leads to ensure they match our ideal customer profile and book them directly into the Sales Director’s calendar.
 
CRM Management: Keep all lead data and touchpoints meticulously updated in our CRM system (Odoo).
 
Requirements
Experience: 1–3 years in B2B sales, lead generation, or an SDR role (technical or maritime sector experience is a strong plus).
 
Mindset: A proactive, resilient "hunter" who thrives on turning cold leads into warm opportunities.

Minimum Hours per Week:

7-9 hours per week

Duration:

1-2 months

�� Build technology that actually changes lives.

We’re looking for a Senior Developer to join the team behind Unify Giving.

Unify Giving is building technology that helps people support verified individuals experiencing homelessness, domestic abuse, poverty and other forms of vulnerability through direct, transparent digital giving.

We’re a small team with a big vision and we’re looking for someone who wants to use their skills to help build products with genuine social impact.

What you’ll be doing

• Working alongside our product and leadership team
• Helping shape technical architecture and future product direction
• Supporting feature development across web and mobile platforms
• Contributing ideas, not just code
• Helping us build scalable technology that can reach thousands of people

We’re looking for someone who

• Has strong experience as a software engineer or senior developer
• Enjoys solving complex problems
• Is comfortable working in a startup environment
• Believes technology can be a force for good
• Can commit a few hours per week

What you’ll get

• Real ownership and influence over the product
• Experience working on meaningful social impact projects
• A chance to build alongside founders, designers and volunteers from around the world
• References and recognition for your contribution
• The opportunity to help shape something from an early stage

If you’ve ever wanted your technical skills to contribute to something bigger than another dashboard or marketing platform, we’d love to hear from you.

We’re looking for frontend a web developer to help us create a groundbreaking web app that promotes sustainable living.

You will play a major role in implementing a series of design upgrades to improve the UX and ensure accessibility, browser compatibility and web standards. Your main task will be to convert design ideas into responsive HTML/CSS components.

What are we looking for?

UK based developers with experience of translating design files into clean, semantic HTML/CSS code and establishing component-based architecture. Ability to:

• Convert design mockups/wireframes into responsive HTML/CSS components;
• Build & maintain reusable component libraries to ensure consistency
• Collaborate with designers & developers to translate visual designs into functional code;
• Optimize components for maximum performance & scalability.

What difference will you make?

You will play a key role in delivering this groundbreaking app and in ensuring it reduces carbon footprints, and inspires and enables sustainable action across the population.

You will be at the forefront of bringing climate action into people’s homes across the UK, making sustainable living accessible and appealing to everyone – and driving real environmental impact.

We’re looking for full stack developers to help us create a ground-breaking web app that promotes sustainable living and climate action.

You will play a major role in:

• developing the server-side logic;
• ensuring high performance and responsiveness;
• ensuring front-end optimization;
• designing and maintaining database schemas.  

What are we looking for?

Three years web development experience with working knowledge of Python and, preferably Django framework.  Ability to:

• Write clean, efficient, and maintainable code that powers the application's back-end logic;
• Integrate user-facing elements;
• Optimize components for maximum performance & scalability;
• Build & maintain reusable component libraries to ensure consistency.

Preferably with PWA experience. 

What difference will you make?

You will play a key role in delivering this innovative app and in ensuring it reduces carbon footprints, and, inspires and enables sustainable action across the population.

You will be at the forefront of bringing climate action into people’s homes across the UK, making sustainable living accessible and appealing to everyone – and driving real environmental impact.