Html5, css3, javascript Work, Jobs in Field Based (with Salaries)

Volunteer Backend Engineer for UK Charity Native App
Nurture The Children International UK —Remote
- Part-time
- Remote
- Azure
- Java
- AWS
- Flexible schedule
- Referral programme
Quick apply
17h
Head of Web, Unsplash
Getty Images —Remote
- Remote
- JavaScript
- APIs
- Leadership
- Employee stock purchase plan
- Annual leave
Quick apply
Senior Full Stack Engineer
Graswald GmbH —Remote
- Remote
- Azure
- Computer Science
- AWS
Quick apply
AI Engineer (Fullstack)
Mad Devs —Remote
- Remote
- English
- Software development
- APIs
- Paid training
- Flexible schedule
Fullstack Software Engineer (f/m/d)
Contentful —Remote
- Full-time
- Remote
- Azure
- DevOps
- AWS
- Annual leave
Junior Business Software Engineer
SECOM PLC —Remote
- Full-time
- Remote
- SQL
- JavaScript
- APIs
- Employee discount
Quick apply
4d
Opportunity for a Startup Tech Investor
Axial Capital Partners —Remote
- Remote
- Software development
- APIs
- Agile
- Work from home
Quick apply
Senior ServiceNow Technical Consultant - SecOps (SIR/VR) - UK Based
Wrangu —Remote
- Remote
- JavaScript
- Scripting
- Communication skills
Quick apply
Full Stack Engineer - MarTech
ZEPZ TECHNOLOGY SERVICES LIMITED —Remote
- Remote
- Java
- AWS
- AI
- Annual leave
- Employee discount
Application Security Architect
Veeva Systems —Remote
- Full-time
- Remote
- Azure
- Computer Science
- Java
- Work from home
Fullstack Software Engineer - Business Solutions
Dataiku —Remote
- Remote
- Machine learning
- APIs
- Python
Senior Software Engineer
Vladimer Avdalov Technologies Ltd —Remote
- £65,000 - £110,000 a year
- Full-time
- Remote
- English
- AWS
- Bachelor's degree
- Work from home
Quick apply
10d
Principal Software Engineering Manager
GitHub, Inc. —Remote
- £111,500 - £207,100 a year
- Full-time
- Remote
- Management
- Doctoral degree
- Computer Science
Application Architect, Medical Imaging
Perceptive —Remote
- Full-time
- Remote
- Doctoral degree
- Computer Science
- DevOps
Engineering Manager
Henry Schein One —Remote
- Remote
- Management
- Master's degree
- AWS
Senior Software Engineer
GitHub, Inc. —Remote
- £76,900 - £142,900 a year
- Full-time
- Remote
- Doctoral degree
- Computer Science
- Engineering
Golang Software Developer
Frontier Resourcing —Remote
- Full-time
- Remote
- DevOps
- Java
- AWS
Quick apply
Senior Solutions Architect - D365/Power Platform
Technology Services Group —Remote
- Remote
- Azure
- Sales
- SQL
- Annual leave
- Employee assistance programme
Senior Cloud Support Engineer
AlphaSense —Remote
- Remote
- Computer Science
- Java
- AWS
Senior Software Developer
Harris Computer Systems —Remote
- £325 a day
- Full-time
- Hybrid work
- Windows
- Java
- SQL
- Annual leave

I want to receive the latest job alerts for html5, css3, javascript in field based

By signing in to your account, you agree to SimplyHired's Terms of Service and consent to our Cookie and Privacy Policy.

Explore jobs in more locations

html5, css3, javascript jobs near field based

Volunteer Backend Engineer for UK Charity Native App

Nurture The Children International UK -
Remote

Quick apply

Job details

Part-time | Volunteer
17 hours ago

Benefits

Flexible schedule
Referral programme

Qualifications

Spring Boot
Authentication
Kotlin
Azure
Go
Node.js
iOS development
iOS
NoSQL
Git
Google Cloud Platform
MongoDB
Java
AWS
Docker
PostgreSQL
New Relic
Back-end development
REST
Django
GitHub
APIs
GraphQL
Heroku
Python
Spring framework
MySQL

Full job description

Volunteer Backend Engineer – Native Mobile App

Organisation:
Nurture the Children International– a registered charity in England and Wales (Charity number: 1173351) dedicated to the fight against poverty globally.

Supporting our education, feeding, water, and health programs provides individual sponsors a simple way to support the world’s most vulnerable children and put an end to child hunger, poverty, and exploitation.

Location:
Fully remote / home-based (UK time zone preferred for easier collaboration)
Virtual meetings via Zoom / Microsoft Teams / Slack

Hours:
Flexible – approximately 4–10 hours per week (arranged around your availability)
Minimum commitment of 6–12 months preferred to support meaningful progress and hand-over

Role Purpose:
To design, build, maintain and secure the backend infrastructure that powers our native mobile app (iOS and Android), ensuring reliable data services, secure user authentication, smooth API performance, and compliance with UK data protection laws (UK GDPR). Your work will directly enable thousands of users / beneficiaries to access critical features such as [e.g. donation processing / resource libraries / peer support / progress tracking / emergency alerts].

Main Responsibilities:

Design, develop and maintain robust, scalable RESTful (or GraphQL) APIs that connect the native mobile apps to backend services
Implement and manage authentication & authorisation flows (e.g. JWT, OAuth2, Firebase Auth, or similar)
Build and optimise data models, database schemas, and queries for user data, content, analytics, etc.
Integrate with third-party services (e.g. payment gateways like Stripe, push notifications, cloud storage, analytics tools)
Ensure high availability, performance and security of the backend (rate limiting, input validation, encryption, vulnerability scanning)
Handle data migration, backups, monitoring, error logging and basic DevOps tasks (CI/CD pipelines if applicable)
Collaborate remotely with frontend/mobile developers, product owners / trustees, and any external consultants via Git, shared docs, and regular stand-ups / sprint reviews
Write clean, documented, testable code and contribute to code reviews
Help maintain compliance with UK GDPR, Charity Commission expectations on data handling, and any sector-specific regulations (e.g. safeguarding for vulnerable users)
Document architecture, APIs (e.g. OpenAPI/Swagger), deployment processes and troubleshooting guides

Tech Stack (Current or Target – we can discuss alignment with your expertise):

Backend language/framework: Node.js (Express/NestJS), Python (FastAPI/Django), Java (Spring Boot), Go, or similar
Database: PostgreSQL, MySQL, MongoDB, Firebase Firestore, Supabase, or equivalent
Cloud / hosting: AWS, Google Cloud, Azure, Heroku, Railway, Render, or Firebase (cost-effective options preferred)
Other tools: Docker (nice-to-have), Git/GitHub, Postman/Swagger for API testing, Sentry/New Relic for monitoring

Skills and Experience (Essential):

Proven experience building and maintaining production backend services / APIs (commercial, open-source or personal projects)
Strong knowledge of at least one modern backend language/framework (Node.js, Python, Java/Kotlin, Go, etc.)
Experience with relational or NoSQL databases and writing efficient queries
Understanding of REST API design principles, authentication patterns, and basic security best practices
Comfortable with Git version control and remote collaboration tools (GitHub, Slack/Teams, etc.)
Self-motivated, reliable, and able to work independently while communicating progress clearly
Commitment to writing readable, maintainable code

Desirable (but not essential):

Previous work on mobile app backends (especially native iOS/Android integrations)
Experience with cloud platforms (AWS, GCP, Azure, Firebase) and serverless architectures
Familiarity with CI/CD, containerisation (Docker), or infrastructure-as-code
Knowledge of UK GDPR / data protection in charities / non-profits
Experience contributing to open-source projects or volunteering in tech-for-good
Interest in our mission area (e.g. health, education, environment, humanitarian)

What We Offer:

Direct, high-impact contribution to our charitable mission through technology
Opportunity to apply / deepen backend engineering skills in a real-world, user-focused product
Supportive remote environment with regular check-ins, code reviews, and feedback
Flexible hours – work when it suits you
Recognition of your contribution (e.g. credits in app/about page, thanks in annual report/website – with consent)
Potential professional reference after sustained contribution (6+ months)
Out-of-pocket expenses reimbursed per our volunteer policy (very limited – mainly specialist tools if pre-agreed)

Job Types: Part-time, Volunteer

Benefits:

Referral programme

Work Location: Remote

Quick apply

Refine Your Search

html5, css3, javascript jobs in field based

Volunteer Backend Engineer for UK Charity Native App

Head of Web, Unsplash

Senior Full Stack Engineer

AI Engineer (Fullstack)

Fullstack Software Engineer (f/m/d)

Junior Business Software Engineer

Opportunity for a Startup Tech Investor

Senior ServiceNow Technical Consultant - SecOps (SIR/VR) - UK Based

Full Stack Engineer - MarTech

Application Security Architect

Fullstack Software Engineer - Business Solutions

Senior Software Engineer

Principal Software Engineering Manager

Application Architect, Medical Imaging

Engineering Manager

Senior Software Engineer

Golang Software Developer

Senior Solutions Architect - D365/Power Platform

Senior Cloud Support Engineer

Senior Software Developer

I want to receive the latest job alerts for html5, css3, javascript in field based

Related Searches

Explore jobs in more locations

Jobseeker tools

Employer Tools

Browse

Stay Connected