A backend developer keeps the data and APIs behind your product correct

When the hard part never reaches a screen: large or messy data, integrations with partners, jobs that must not run twice, or a service other teams call. A full-stack developer covers a small product's API well. Depth in those areas, and the patience to design a schema that has to last for years, is what a backend specialist adds.

PHP with Symfony, C# on .NET, Node.js with TypeScript, and Python: the languages in our recent client work. The developer works in whatever your services are written in. A rewrite in another language is proposed only with a reason you can check, such as a library your language lacks, never because the developer prefers something else.

Usually. A risky change is split into steps that each run alongside the current release: add the new structure, write to both, copy existing data across in batches, move reads over, and remove the old structure only once nothing uses it. Where a change cannot run beside the live release, the developer proposes a maintenance window in advance.

Both. A well-structured monolith serves many products well past the point where teams start talking about microservices. The developer proposes splitting out a service only when one part has to scale, deploy or fail on its own, and writes down why before anything moves. Splitting too early mostly adds network calls and new ways to fail.

Both, chosen per query. The ORM covers ordinary reads and writes, while reports and bulk updates get hand-written SQL. On busy endpoints the developer reads the SQL the ORM actually generates, because an innocent loop can send one query per row, and that pattern only shows itself under production data volumes.

In layers. Traffic between services is encrypted, with mutual TLS where each side has to prove who it is. Sensitive fields are encrypted at rest, secrets stay out of the code, and access to personal records is logged. Your security or legal team sets which rules apply to your data, and the developer builds to them and shows where each one is enforced.

If the bottleneck is in the code or the database, usually yes, and the developer finds out where it is first. Load tests against a copy of production show where requests queue: a missing index, a query per row, a lock held too long, a slow partner call inside a transaction. Limits in the infrastructure itself are DevOps work, and we will say so.

Through the contract, before the code. Every change starts as a diff to the OpenAPI or GraphQL schema that callers can review. Additive changes ship in the current version. A breaking one gets a new version, a deprecation date and a changelog entry, and the old version keeps working until its callers have moved across.

Yes. Many clients start with one senior engineer to cover a specific capability or capacity gap, then add specialists only when the roadmap requires them.

Yes. Adding an engineer follows the same route as the first, and you interview them. Reducing the team follows the notice period agreed in the contract, and the work is handed over in your repository before anyone leaves.

Yes. You manage priorities and day-to-day work directly, in your own channels and delivery process.

Yes. You interview every candidate using your own process and make the final decision about who joins the team.

Our engineers are ImproveIT employees and long-term contractors working through our teams in Poland and Ukraine. We are not a freelance marketplace and do not resell developers from other vendors.

Replacement terms are defined in the contract upfront, so it does not become a negotiation.

You do. IP assignment is included in the contract, and we can sign an NDA before discussing the project.

We sign an NDA before discussing the project, and confidentiality and IP assignment are part of the contract. Engineers work in your repositories, cloud accounts and tools with the access your team grants, so you can narrow or revoke it at any time.

Yes. Our engineers work with teams across Europe and the US. We agree the required working-hour overlap before matching candidates.

Our developers work in English with international product and engineering teams every day. English level is included in the candidate information you receive before the interview.

Rates depend on the role, seniority, experience, and engagement model. You receive the rate, availability, and candidate profile in writing before making any commitment.

Both are agreed before the engagement starts and included in the proposal and contract. We are flexible in that and usually agree on the terms suitable for a client.