Backend Developer
A backend developer builds the server-side rules and data services behind an application.
What does this role do?
A backend developer builds the server-side rules and data services behind an application. When a user submits a form, backend code may validate it, check permissions, update a database, and return a response. A junior task might add a tested endpoint or investigate why a request fails.
Backend work focuses on services and data, whereas frontend work presents the interface. A full-stack role connects both layers; backend languages and frameworks vary substantially between employers.
- Design request and response formats that match an agreed API contract.
- Model data and implement safe queries, validation, and permission checks.
- Test service behaviour and use logs to diagnose failures without exposing secrets.
Skills to learn
Start with the foundations below. Learn to explain and use each skill in a small task before adding another technology. Requirements differ between employers, levels, locations, and industries; this is a starting point for research rather than a universal syllabus.
- Choose one backend language; learn functions, errors, modules, and asynchronous work where relevant.
- HTTP and REST: understand methods, status codes, validation, and clear error responses.
- SQL and data modelling: use keys, relationships, migrations, and transactions. Learn authentication and authorisation as separate concerns.
Advanced or optional skills — choose according to the role
Queues, caching, containers, and distributed systems are later extensions when a project or vacancy needs them. Start with a reliable single service.
Tools and technologies
Choose a small, coherent toolset that supports the work you want to demonstrate. An editor, command line, version control, and a repeatable test workflow matter more than listing many products. Use Git to record your own changes and GitHub or another appropriate host to share permitted work; keep credentials and private data out of commits.
| Tool or environment | Purpose |
|---|---|
| Node.js or a target-role language runtime | Run server code and understand its request-processing model. |
| PostgreSQL and a database client | Inspect records, practise queries, and manage schema changes. |
| API client, test runner, and logs | Send requests, reproduce errors, and verify behaviour beyond the happy path. |
Beginner projects and portfolio
The following ideas are illustrative learning projects, not claims of professional experience. Start with the smallest useful version, check it, and extend only after it works. For team work, identify your contribution and credit other people, libraries, datasets, and starter material.
For each project, keep a README with the problem, intended user, setup, sample inputs, test commands, your decisions, and honest limitations. A reviewer should be able to reproduce the core behaviour. Use screenshots or a short demonstration where helpful, and include technical evidence such as tests, queries, diagrams, or a report rather than relying on images alone.
Project 1: Job-application tracker API
Store and retrieve fictional application records.
- First version: Implement create, read, update, and delete endpoints with validation, SQL persistence, and tests.
- After the basics work: Add tested per-user access control and filtering; keep credentials out of source control.
- Portfolio evidence: Provide an API contract, schema diagram, setup, sample requests, failure cases, and database-test instructions.
Project 2: Background import service
Import a small synthetic CSV into a service.
- First version: Validate records and report rejected rows without silently losing them.
- After the basics work: Add safe retries and prevent duplicate imports.
- Portfolio evidence: Show data flow, error handling, repeat-run behaviour, and limits of the deployment.
How to prepare for entry-level jobs
Practise tracing a request through validation, permission checks, database operations, and a response. Explain a bad request, a missing record, and a database failure. Never claim that a login screen alone establishes secure authorisation.
Check whether the vacancy offers supported junior work or expects independent specialist ownership. A familiar title can hide very different responsibilities. Training projects demonstrate learning; they do not replace required work authorisation, qualifications, or experience where these are genuinely essential.
Related search terms to investigate: Junior Backend Developer, API Developer, Server-Side Developer. These are search ideas, not exact equivalents or evidence that jobs are available. Read responsibilities and seniority for each result.
- Compare several recent vacancies in a realistic target market. Record recurring responsibilities, essential requirements, preferred skills, location, and eligibility. Do not reject yourself solely for missing a preferred tool, but take genuine requirements seriously.
- Match those requirements to evidence from your work. Use job-application tracker api as a possible work sample only if you actually build and understand it. Identify one important gap and a manageable exercise to address it.
- Tailor your CV and LinkedIn around truthful contributions: what you did, the tools you used, and what can be checked. Label personal, academic, and volunteer projects accurately, and link to the relevant evidence.
- Practise a two-minute project explanation and the role-specific topics above. Explain a decision, an error you investigated, a test, and what you would improve. Ask about mentoring, assessment format, and initial responsibilities.
Learning roadmap
Move through these milestones at a pace that fits your starting point and circumstances. There is no fixed completion timeline. Before moving on, check whether you can explain the concept, complete a small task independently, and recognise when you need help.
- Learn one language, HTTP, and simple server routes.
- Design a small relational schema and practise SQL.
- Build the tracker API with validation and database tests.
- Add access control, logs, deployment notes, and a clear explanation of failure handling.
- Turn the strongest work into a reproducible portfolio example. Get feedback on correctness and clarity, improve one weakness, and practise explaining your own decisions.
- Compare your evidence with current job descriptions again. Choose a focused next gap or suitable supported opportunity rather than assuming that finishing this roadmap guarantees job readiness or employment.
Trusted learning resources
Use the official resources that match your current question. Follow the relevant prerequisites and check documentation against the version or ecosystem used by your project. These links teach technical subjects; they do not establish demand for a role or a universal employment requirement.
Your next steps
Make the exploration concrete. Record a small outcome you can check, then review your progress and gaps. This checklist records your actions; it is not a qualification or assessment of career suitability.
Copy career action review
Career learning action review: 0 of 5 complete Review [ ] To review: Try an introductory exercise related to choose one backend language; learn functions, errors, modules, and asynchronous work where relevant. [ ] To review: Build and check the first version of job-application tracker api [ ] To review: Document my own contribution, tests, decisions, and honest limitations [ ] To review: Review suitable vacancies and record recurring requirements and gaps [ ] To review: Ask for feedback and choose my next practical learning step Completed actions are not proof of job readiness or a guarantee of employment. Keep the project evidence and review current role requirements.
Current job-market context
No live postings or verified demand figures are embedded. Check location, work authorisation, and experience requirements in current listings. This guide does not establish demand in your region or promise an employment outcome.
Search current listings on Indeed ↗