//programming

Custom software and API engineering for business systems

Bespoke back-end systems, APIs and internal tools written around how your company actually works. You own the code, the repository and the deployment pipeline from the first commit.

Request Technical Audit

API.ENG

Custom Software & API Engineering

Software written for one company’s process rather than adapted from someone else’s: back-end services, public and partner APIs, internal tooling, integrations and data pipelines. Every engagement ships with source code the client owns, automated tests, documentation and a deployment pipeline — so the system does not depend on us to keep running.

REST, GraphQL and event-driven API design and implementation
Back-end services, background workers and data pipelines
Internal tools and integrations around existing business systems
Automated tests, CI/CD and documentation in every delivery

deliverable → Client-owned source + tests + docs

//scope

How a build engagement runs

Discovery: the process the software serves, the data it touches and the systems it talks to
Written specification and API contract, agreed before implementation starts
Iterative delivery in short cycles, each one deployable to a test environment
Automated tests and code review on every change
Handover: documentation, runbooks and a walkthrough for your team
Optional maintenance agreement — never a condition of the build

Intellectual property in bespoke code is assigned to the client under the written agreement.

Out of scope

No remote technical support for consumers, home computers or personal devices.
No virus removal, PC repair, printer, router or account-recovery services.
No third-party cleaning, optimisation or “speed-up” software, and no software resale.
No real-money gambling, betting or casino software, and no work on cheats or anti-cheat circumvention.
No cryptocurrency token sales, trading systems or financial-advice products.

The full list of business we do not take on is in the Terms of Service.

POST /api/v1/request-audit

Request a Technical Audit or consultation

For companies only. Requesting costs nothing and commits you to nothing; scope and price are agreed in writing before any work starts. All fields are required.

Company name *

Your name *

Work email *

Company size *

Service area *

System and problem *

0 / 5000 characters — at least 30

Privacy notice — how we use what you send

Controller. 3S Game Studio OÜ, Poordi tn 3-63, 10156 Tallinn, Kesklinna linnaosa, Harju maakond, Estonia, registry code 16279375. Contact: contact@3sgamestudio.com.
What and why. Company name, your name, work email, company size, service area and your description — only to assess and answer your request for a Technical Audit or consultation. Every field is needed for that; nothing is optional and nothing else is collected.
Lawful basis. Steps taken at your request before entering into a contract, GDPR Article 6(1)(b). We do not ask for consent, because consent is not the basis for answering you.
Retention. Deleted 12 months after we receive it unless it becomes a contract. A scheduled job performs the deletion.
Who sees it and where. 3S Game Studio OÜ, and Namecheap, Inc. as the hosting processor. The server is in the United States, outside the European Economic Area; the transfer rests on Standard Contractual Clauses, Article 46(2)(c) GDPR. Not sold, not used for advertising, no automated decision-making.
Your rights. Access, rectification, erasure, restriction, portability and objection (Articles 15–21 GDPR). You may complain to the Estonian Data Protection Inspectorate (Andmekaitse Inspektsioon).
Anti-abuse. A salted one-way hash of your IP address is kept for minutes for rate limiting; the address itself is never stored.

Full detail: Privacy Policy · Cookie Policy · notice audit-notice-2026-10-08