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Expertise · Back-end engineering
Back-End Developer: Reliable APIs and Data in Production
A back-end developer’s work is the business logic, APIs, data and processing that make your software run. At Etixio, our back-end engineers build and evolve this foundation within a team supervised by a tech lead, and connect your product’s AI features to it all the way to production.
Understanding the technology
Back-end engineering in your project.
The back-end carries the business rules, data access and services that feed the interfaces. Its role is not limited to exposing endpoints: it must ensure that an authorized operation produces the right effects, even when several users or systems act at the same time.
A back-end developer designs, secures and evolves this technical foundation: business services, APIs, databases, integrations and asynchronous processing. The product’s reliability, performance and ability to evolve depend on it.
The right time
When should you bring in a back-end developer?
Back-end work comes into play at every stage of an application’s life, from creating a new product to taking over an existing platform.
Support scaling
Optimize queries, indexes, caching and processing as the platform grows and response times degrade.
Strengthen security
Authentication, permission management, operation traceability and protection of personal or sensitive data.
Reduce technical debt
Evolve an existing architecture step by step, with tests that protect current behavior, rather than starting from scratch.
Connect your tools and partners
Design or evolve REST or GraphQL APIs, connect CRM, ERP, payment and business tools, handle data ingestion and asynchronous processing.
Our scope of work
The work we take on.
Business rules
Model processes and validations independently of the interface.
Integrations
Connect data, services and external applications through defined contracts.
Reliability
Test critical operations, permissions and failure scenarios.
Performance
Examine queries, caching and bottlenecks based on measurements, not hunches.
Our back-end expertise
The back-end technologies we master.
The choice of language and framework depends on your existing systems, your teams and the product’s constraints. We work with the main back-end stacks on the market.
Languages & frameworks
Java with Spring Boot, PHP with Symfony and Laravel, Node.js and TypeScript with NestJS or Express.js, Python, C# and .NET.
APIs & integrations
REST, GraphQL, OAuth2 and SSO, connections to ERP, CRM and payment platforms.
Databases
PostgreSQL, MySQL, SQL Server and MongoDB, chosen according to usage and business constraints.
Performance & reliability
Redis, message queues, asynchronous processing, monitoring and observability.
Quality & operations
Unit and integration tests, CI/CD pipeline, code reviews and sound operational practices.
Back-end and AI
The back-end, where AI becomes a reliable service.
An assistant, search across your documents or automatic extraction all rely first on back-end work: model calls, access to authorized data, error and timeout handling, logging, evaluations and cost tracking. This is often what an AI POC is missing to become a usable service.
Our teams integrate these features as services of your application, with the same security and testing rules as the rest of the code. See our AI solutions for businesses and our AI agents and chatbots.
In the field
From technology to real-world use.
In booking software, we define availability, permissions, validations and exchanges with the payment system. A repeated request, a timeout or a lost external response all require planned handling. Tests check data consistency and the ability to recover the actual state of the operation.
The choices that matter
The choices to examine before building.
We set the boundaries between components according to the product’s rules and dependencies. Too much separation complicates transactions and operations; concentrating all the rules in one place slows down changes. Whether a well-structured monolith or separate services, the assessment focuses on these responsibilities before settling on an architecture.
Engagement formats
How our back-end developers work with you.
Within a dedicated team
A dedicated team evolves your product over the long term. Back-end work sits alongside front-end, QA and DevOps, under the responsibility of a tech lead, and fits into your tools and rituals.
On a fixed-price project
For an API, an integration or a module with a defined scope, a fixed-price project commits to a result, a budget and a timeline.
Build & Run
Development, maintenance and enhancements handled over the long term, with fixes, dependency updates and production monitoring.
From work to deliverables
Delivery your team can take over.
The scope of work specifies the components to build or take over and the acceptance criteria. We provide what is needed to understand the changes, verify them and continue the work.
- Services and API contracts
- Tests of business rules
- Deployment procedures
Frequently asked questions
Back-end developer: your questions.
What does a back-end developer do?
They design, secure and evolve the technical core of an application — business logic, APIs, databases, integrations and processing — to ensure its reliability, performance and ability to evolve.
When should you bring in a back-end developer?
When building an MVP, scaling up, undertaking a technical overhaul, integrating new systems or when your team lacks the capacity to deliver its roadmap.
What level of seniority do you provide?
Seniority is chosen according to the technical complexity and the level of autonomy expected. In every case, the work is supervised by an Etixio tech lead and goes through code reviews and automated tests.
Do your back-end developers work with our teams?
Yes. They integrate into your tools, take part in your rituals and collaborate with your developers, Product Owners, QA and stakeholders. The engineers are French-speaking, based in Madagascar and Mauritius, with a 1 to 3-hour time difference from Paris.
Can we start with a single back-end developer?
Yes. A collaboration can start with one engineer on a specific scope, then expand to other skills (front-end, QA, DevOps) as the product evolves.
How long does it take to get started?
The lead time depends on the skills required and the scope. For a dedicated team, setup generally takes four to eight weeks, with a gradual ramp-up.
Which back-end technologies do you use?
Java and Spring Boot, PHP with Symfony or Laravel, Node.js with NestJS or Express.js, Python and .NET, with PostgreSQL, MySQL, SQL Server or MongoDB. We start from your existing systems rather than imposing a stack.
Can you integrate AI into our existing back-end?
Yes. Model calls, document search and agents are integrated as application services, with access rights, logs, evaluations and cost tracking. We can also take over an AI POC and put it into production.
Let’s talk about your technical context.
Tell us about the application, the issue to address and the known constraints. We will review the dependencies and the initial scope of work with your team.