Tallinn, Estonia·Registry 14773496·EU VAT EE102445932
Est. 2019 in Tallinn, Estonia. Custom programming, cloud infrastructure engineering, and strategic B2B IT advisory. We work with organisations under written agreement, from a signed statement of work through to source code your own team owns and operates.
4Tuna OÜ provides software engineering and IT consulting to organisations. We do not offer consumer technical support, device troubleshooting, account recovery for individuals or third-party software licence resale.
Interactive planning tool
306
251–392 person-days
12w
10–15 weeks
6
people at peak
5
delivery stages
Recommended pattern
Service-oriented
The integration surface and availability target justify separating the parts that change or scale at different rates, while keeping the service count low enough that one team can still operate the estate.
Effort by phase (person-days)
Architecture pressure
Indicative team shape at peak
This is not a quotation. This estimator is an indicative planning aid produced from the parameters you selected. It reports engineering effort, elapsed duration and team shape. It is not a quotation, an offer or a commitment, and it deliberately contains no monetary figures: 4Tuna OÜ issues fees only in a written proposal after reviewing an actual request for proposal. Real figures depend on requirements, existing systems and constraints that no on-page calculator can see.
Service pillars
Most engagements draw on more than one of these. An advisory review often becomes a build; a modernisation programme almost always needs the platform work underneath it.
Full-Stack & APIs
Bespoke business applications and service APIs built to a written specification, delivered as source code your organisation owns.
Advisory & Design
Independent technical advisory for organisations deciding what to build, what to buy and what to retire.
Platform Engineering
Reproducible infrastructure, deployment pipelines and observability for systems that have to stay up.
Migration & Decomposition
Incremental decomposition of systems that still earn their keep but can no longer be changed safely.
How we work
The technical decisions matter, but they are rarely what causes a project to fail. These four commitments are what a written agreement with us actually contains.
Every engagement starts with a specification and an architecture note that both sides sign. If we disagree about what is being built, the cheapest place to find that out is a document.
Work lands as reviewed pull requests in a repository your organisation owns from day one. There is no point at which the code lives only with us.
Tests, migrations, runbooks and a working deployment pipeline are deliverables in their own right. Your team should be able to operate the system without calling us.
Where personal data is in scope we map the lawful basis, retention and data subject request path during design, because retrofitting those into a live system is expensive and usually incomplete.
Who you would be contracting with
4Tuna OÜ is an Estonian private limited company entered in the Estonian Business Register on 01.08.2019 under registry code 14773496. Its registered office is at Liivalaia tn 13, 10118 Tallinn, Kesklinna linnaosa, Harju maakond, Estonia. The company holds EU VAT number EE102445932, which can be checked in the European Commission’s VIES service.
Its filed principal activity is EMTAK 62901, other information technology and computer service activities — the classification under which IT consulting and software services are registered in Estonia.