When a payment provider’s webhook arrives twice, when a sale doubles traffic overnight, or when a mobile app still calls an endpoint you meant to retire, it is the backend developer’s design choices that decide whether anyone notices. Users never see their work directly. They only see the result, such as an order that is charged once even though the provider reported it twice.
On this page you will find a backend developer job description to copy and edit, a breakdown of the role by level, practical ways to test backend skills, the mistakes that weaken these listings, and guidance on contract versus permanent hiring.
Backend developer job description template
Replace the bracketed fields and choose the language line that matches your stack.
About the role
[Company] is hiring a Backend Developer to design and run the services behind [product]. You will build APIs used by our [web app / mobile apps / partners], model our data, and keep the system reliable as usage grows. Our backend runs on [Node.js / Java with Spring Boot / Go / .NET Core] with [PostgreSQL / MySQL] on [cloud platform]. You will join the [team name] team in [city / remote].
Responsibilities
- Design clear, consistent APIs (REST, GraphQL or gRPC) and document the contracts other teams depend on.
- Model the domain in code and in the database so business rules live in one place and are easy to change.
- Use queues and asynchronous processing [Kafka / RabbitMQ / SQS] for work that should not block a request.
- Add caching with Redis or similar where it helps, with a clear plan for invalidation.
- Build reliable integrations with third parties such as payment gateways, SMS providers and ERPs, handling retries, timeouts and duplicate events.
- Add logging, metrics and tracing so problems can be found from dashboards rather than guesswork.
- Find and fix performance bottlenecks using profiling, query analysis and load tests.
- Plan backward-compatible changes and API versioning so clients do not break on release.
- Take part in on-call or incident response and write blameless reviews afterwards.
Requirements
- [X]+ years building backend services that run in production.
- Strong skills in one backend language: [Node.js / Java / Go / C#], and willingness to read others.
- Deep understanding of relational databases: transactions, isolation levels, indexing and migrations on live tables.
- Experience designing and versioning APIs used by more than one client.
- Experience with at least one message queue or event streaming system.
- Practical knowledge of observability tools such as Prometheus, Grafana, Datadog or OpenTelemetry.
- Understanding of backend security: authentication, authorisation, secrets handling and input validation.
Nice to have
- Experience splitting a monolith into services, or deciding not to.
- Familiarity with Docker, Kubernetes and infrastructure as code.
- Experience with event-driven patterns such as the outbox pattern or event sourcing.
- Experience running load tests with k6, JMeter or Gatling.
What we offer
- [Salary range].
- [Work mode and on-call arrangement, if any].
- [Benefits].
How the backend developer role changes by level
Junior backend developer. Adds endpoints and business logic inside services that already exist, following established patterns for validation, error handling and data access. The job description should ask for one language, SQL basics and an interest in how systems behave under load, and should not expect them to design queues or caching strategy yet.
Mid-level backend developer. Designs a service or a significant API. They choose where data lives, when to process something asynchronously, and how an integration should behave when the partner is down. They can be trusted on-call. Requirements should ask for production incidents they have handled and what they changed afterwards.
Senior backend developer. Owns the architecture of a backend area: service boundaries, data consistency across services, capacity planning and the migration path from today’s design to the next one. They review designs from others and spot failure modes early. A senior JD should ask for evidence of systems they designed and kept running, and how they handled a change they got wrong.
Above senior, some companies have a backend team lead, who adds sprint planning, hiring and people management to the technical ownership. If the role includes managing people, say so plainly, because it changes who applies.
Skills that matter most and how to check them
Backend work is mostly about what happens when things go wrong, so the best screening questions are about failure, scale and change.
- System design at the right size. Ask them to design an order service for a mid-sized online store, not a global social network. Look for sensible choices about the database, idempotent order creation and what goes on a queue.
- Handling duplicate and out-of-order events. Ask: “The payment gateway sends the same success webhook three times. What happens in your system?” You want idempotency keys or unique constraints, not hope.
- Database depth. Ask how they would add a non-null column to a table with many millions of rows without downtime. Good answers go step by step through migration, backfill and constraint.
- Debugging from signals. Show a graph where latency rises every day at the same time and ask what they would check. Listen for slow queries, scheduled jobs, connection pools and cache expiry.
- API design. Give them a badly designed endpoint and ask what they would change and how they would roll the change out without breaking existing clients.
Common backend developer job description mistakes
- Writing it like a full stack role. Adding React and CSS to a backend listing confuses candidates and puts off specialists. Fix: keep the listing on services, data and reliability, and mention the frontend only as context.
- Naming “microservices” without saying what you run. The word is used for everything from two services to two hundred. Fix: describe your real architecture in a sentence.
- Hiding on-call. Backend developers often carry a pager. Fix: state whether there is on-call and how it is shared, so there are no surprises at offer stage.
- Asking only about frameworks. Spring Boot or Express experience says little about design judgement. Fix: include responsibilities about data modelling, consistency and failure handling.
- Leaving out scale context. Candidates want to know if they will handle a small internal system or heavy public traffic. Fix: describe usage in words, such as “used by thousands of retailers every day”, without needing exact numbers.
Contract, contract-to-hire or permanent
A contract backend developer works well for bounded technical projects: integrating a new payment gateway, adding a queue to take load off the main database, or migrating a service to a new framework. Experienced contractors often have done the same migration elsewhere.
Contract-to-hire makes sense when you need backend help now but want to see how someone behaves on-call and in incidents before making them part of the core team.
Permanent is the better choice for developers who will own your core data model and services, because that knowledge builds up slowly and is costly to replace. Zilo AI can help you hire backend developers in India on contract, contract-to-hire or permanent terms, in Node.js, Java, Go or .NET. Our IT hiring services also cover DevOps, cloud and QA roles that usually work alongside a backend team.
Frequently asked questions
What should a backend developer job description include?
The language and framework, the database, the kinds of systems the person will build (APIs, integrations, background processing), how reliability is handled including on-call, the level, and pay and work mode. A sentence on your architecture helps candidates judge fit quickly.
What is the difference between a backend developer and a backend team lead?
A backend developer is judged on the services and code they deliver. A backend team lead still makes technical decisions but also runs planning, code review across the team, hiring and people development, and answers for the team’s delivery to product stakeholders.
Which language should a backend developer know?
The one your services are written in. Node.js, Java, Go and C# are all common. Strong backend developers transfer between languages more easily than between ways of thinking, so design and database skills matter more than the exact language.
Does a backend developer need DevOps skills?
Some, yes. They should be able to read logs and metrics, understand how their service is deployed and use Docker. Running the cluster, networking and pipelines is usually a DevOps engineer’s job.
If you want Zilo AI to find backend developers who have run systems in production, tell us your stack and how your services are built. Contact Zilo AI to discuss the role.