Backend Developer
Build the logic and systems that power apps behind the scenes.
What does a Backend Developer do?
Backend developers work on the server side — building APIs, handling data, managing authentication, and writing the business logic that makes products work. You rarely see your output directly, but you power everything users do.
Who it fits
People who enjoy systems thinking, working with data, and solving problems that don't have a visible face.
Good for methodical learners who enjoy understanding how systems connect under the hood.
Skills you need
Tools you will use
Starter projects
Good projects to practise and add to a portfolio.
- REST API for a to-do app
- User login and registration system
- Blog API with CRUD operations
- URL shortener service
// ROADMAP
Backend Developer career roadmap
Estimated time: 8–14 months
Badges show what each resource is. Only items marked certification lead to a professional credential — everything else is learning material.
Programming Language Basics
6–8 weeksPick Python or JavaScript/Node.js and learn it properly. Master functions, data structures, error handling, and how to read documentation. This foundation carries you everywhere.
SQL & Databases
4–6 weeksMost backend work involves data. Learn SQL — joins, aggregations, indexing basics. Set up PostgreSQL locally and interact with it through code.
REST APIs & HTTP
4–6 weeksBuild APIs that frontends and mobile apps can call. Understand HTTP verbs, status codes, authentication patterns (JWT, sessions), and how to design clean endpoints.
Frameworks (Express, NestJS, or FastAPI)
6–8 weeksFrameworks save you from reinventing the wheel. Express (Node) or FastAPI (Python) for flexibility. NestJS for structure. Pick one aligned to the language you chose in Step 1.
Docker & Deployment
2–4 weeksLearn Docker to containerise your app so it runs consistently anywhere. Deploy to Railway, Render, or Fly.io. Your API should be accessible on a real URL — not just 'localhost'.
System Design Basics & Job Ready
4–6 weeksLearn enough system design to talk confidently in interviews — caching, load balancing, database scaling. Start applying for backend or API-focused roles.
// START LEARNING
Backend Developer learning resources
Videos first — they're the fastest way to get moving — then reading, hands-on practice and courses. Only resources badged professional certification award a formal credential.
Git & GitHub Crash Course 2025
Traversy Media · 1 hour
A current, practical introduction to version control and collaborative GitHub workflows.
Learning resource. This does not award a professional certification.
Node.js and Express.js Full Course
freeCodeCamp · 8 hours
Build server-side JavaScript foundations, APIs and Express applications.
Learning resource. This does not award a professional certification.
Docker Tutorial for Beginners
TechWorld with Nana · 3 hours
Containers, images, Docker Compose and the workflow used by cloud and platform teams.
Learning resource. This does not award a professional certification.
Software Testing Explained in 100 Seconds
Fireship · 2 minutes
A concise orientation to testing levels, test-driven development and quality practices.
Learning resource. This does not award a professional certification.
An Overview of HTTP
MDN Web Docs
Understand requests, responses, headers, caching and the protocol behind web applications and APIs.
Learning resource. This does not award a professional certification.
PostgreSQL Tutorial
PostgreSQL
The official hands-on introduction to relational concepts, SQL queries, joins, aggregates and transactions.
Learning resource. This does not award a professional certification.
// PRACTISE
Gain Backend Developer work experience
Build practical evidence before your first role. Provider terms and eligibility can change.
Forage · Employer job simulations
virtual-job-simulation · REMOTE
Complete self-paced tasks designed by employers and compare your work with example solutions.
Extern · Remote company externships
externship · REMOTE
Work on structured real-company projects with flexible remote delivery.
GitHub · Good first issues
open-source · REMOTE
Find newcomer-labelled issues and build evidence of collaboration in public repositories.
// FIND WORK
Find Backend Developer jobs
Start with “Backend Developer”. Platforms without stable public search URLs open with this suggested phrase.
LinkedIn Jobs
Broad professional job search with keyword, location, experience-level and remote filters.
Wellfound
Startup and technology roles with company and compensation context.
Dice
Specialist technology roles across engineering, data, security and infrastructure.
Built In
Technology and startup job discovery, including remote and city-focused listings.
UK visa and international opportunities
Sponsorship depends on the employer, vacancy and current immigration rules. Use the linked official guidance and verify every role before applying.
Going independent
Backend skills enable both client work and product businesses. API development is particularly in demand from frontend-heavy teams who need backend expertise.
Freelance API and Backend Development
Low barrierBuild APIs, databases, and server-side systems for startups and agencies that need backend expertise without hiring full-time.
Examples
- Building REST or GraphQL APIs for startup products
- Database design and optimisation for growing companies
- Authentication and payment integration projects
- Migrating legacy systems to modern APIs
Getting started
- 1. Pick a specific stack and position around it — e.g. "NestJS and PostgreSQL specialist"
- 2. Build a portfolio of API documentation as well as code
- 3. List on Toptal and Lemon.io for vetted freelancing at higher rates
- 4. Reach out to frontend developer communities — they often need backend help
Developer Tools and SaaS Products
Medium effortBuild infrastructure tools, boilerplates, or automation products that other developers pay for. A well-positioned backend tool can grow significantly.
Examples
- Authentication-as-a-service tools
- Webhook infrastructure services
- Database backup and monitoring SaaS
- API testing and documentation tools
Getting started
- 1. Find friction in your own backend development workflow
- 2. Look at what developer tools have recently raised funding — validation signal
- 3. Open source first, then charge for cloud hosting or advanced features
- 4. Post on Hacker News Show HN for early traction
Technical Consulting and Architecture
Medium effortSenior backend developers can charge high rates for architecture reviews, system design guidance, and technical due diligence.
Examples
- Database architecture review for growing startups
- API design consulting for product teams
- Technical due diligence for investors and acquirers
- Performance bottleneck analysis and remediation
Getting started
- 1. Build your positioning around a specific outcome — "I help SaaS teams handle 10x user growth"
- 2. Write case studies of problems you have solved
- 3. Network in startup founder communities where technical help is needed
- 4. Start with a productised fixed-scope review offering at £1,500–£3,000
Communities & tools
// EARNING POTENTIAL
Earning potential
2025Consistently high demand with strong salary growth, especially in cloud-native stacks and distributed systems. Specialising in high-performance or financial systems adds significant salary leverage.
Freelance rates
Day rate
£300–£700
Hourly rate
£40–£90
What affects salary
- Language and ecosystem — Go, Rust, and Java engineers often earn more than Node or PHP
- Domain knowledge — fintech, healthcare, and trading systems command a premium
- Database expertise, especially PostgreSQL and distributed databases
- Cloud platform experience (AWS, GCP, Azure) significantly increases value
- Open-source contributions raise profile and negotiating power
🌍 Backend engineers at US product companies earn $120k–$200k+. Remote positions from European companies offer competitive salaries with lower cost of living.
Based on: ITJobsWatch · Glassdoor UK · LinkedIn Salary · Stack Overflow Survey. All figures approximate.
// RESOURCES
Free resources to get started
Recommended starting points — no payment required.
- Course
- Course
- Course
- Lab
- Tutorial
Paid courses worth considering
These are not required — free resources above can get you far.
- Course
- Course
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