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Full-stack software engineering · Serbia, Croatia & EU

Custom software and SaaS, from database to interface.

DEUS Engineering is a Serbian software company that designs, builds and maintains web platforms, APIs and applied-AI systems for companies in Serbia, Croatia and across the EU — on a defined project or as an extension of your team.

Discuss your projectExplore selected work
Markets
Serbia · Croatia · EU
Working model
Remote-first · CET
Languages
English · Srpski
In production
Pametni Advokat

01 Selected work

Two projects, two kinds of proof.

Pametni Advokat, a production SaaS built for law offices in Serbia, and Ariaska RL, the founder’s public research project in multi-agent reinforcement learning — engineering for production next to research that states its limits.

Production product

Pametni Advokat

A production web platform for Serbian law offices: cases, clients, hearings and deadlines, private documents, fees under the bar tariff and invoicing in one system — with an AI assistant that prepares and checks while the lawyer decides.

pametniadvokat.rs(opens in a new tab)
pametniadvokat.rs
Pametni Advokat office overview: navigation for clients, cases, calendar, invoices, costs and the AI assistant, with quick actions for new clients, cases, events and invoices. Demo data.
Fig. 1Pametni Advokat — office overviewDemo data
pametniadvokat.rs
Pametni Advokat case register with search and filters by area, status, client, responsible lawyer and priority, above a list of demo cases.
Fig. 2Case register with filtersDemo data

Pametni Advokat is the full stack in one product: an isolated multi-tenant data model in PostgreSQL, private document storage, billing rules enforced in the database and an AI assistant that prepares while the lawyer decides.

Read the case study: Pametni Advokat

Pametni Advokat — product presentationProduct presentation · 2 min · in Serbian

Inside Pametni Advokat

  • Cases
  • Clients
  • Hearings & deadlines
  • Documents
  • Tariff & invoices
  • AI assistant
Research project

Ariaska RL

Multi-agent reinforcement learning research

An experimental research platform by founder Filip Volf: five agents with distinct roles learn through reinforcement learning in isolated, simulated environments, with a language model as an optional mentor that can be switched off.

Experimental · core recovery merged 17 Oct 2026 · partial research readiness

View project: Ariaska RLView repository on GitHub(opens in a new tab)
Fig. 3Role architecture — schematic, not to scale
Explore selected work

02 Services

Twelve services across the whole stack.

Organised in three groups: building the product; the data, AI and platform it rests on; and review and continuity, so the system stays sound. Each service has its own page.

Build

What people see and work in — the product itself, its design, the application interface and the public website.

  1. 01

    Custom software & SaaS

    Outcome: One system of record instead of scattered tools.

  2. 02

    Product & UX/UI design

    Outcome: A product shaped around the real work — agreed before the build begins.

  3. 03

    React, Next.js & TypeScript front ends

    Outcome: Interfaces people use quickly — and developers change safely.

  4. 04

    Websites & technical SEO

    Outcome: One consistent story for people, search engines and AI tools.

Data, AI & platform

What sits behind the interface — data models and APIs, applied AI, ML prototypes and the cloud infrastructure everything runs on.

  1. 05

    APIs, backend architecture & PostgreSQL

    Outcome: Business rules enforced once, where the data lives.

  2. 06

    Applied AI & business automation

    Outcome: Less manual work, with a person accountable for every decision.

  3. 07

    ML & AI R&D prototypes

    Outcome: Evidence to build, rework or stop, from experiments you can rerun.

  4. 08

    Cloud infrastructure & integrations

    Outcome: Routine releases and observable integrations.

Review & continuity

What keeps a system sound over time — security designed in, written reviews, upgrades, maintenance and engineering capacity under a B2B contract.

  1. 09

    Security-aware architecture

    Outcome: Security decisions made deliberately — and written down.

  2. 10

    Technical audit & architecture consulting

    Outcome: What to fix first, what can wait — and why.

  3. 11

    Software modernisation & maintenance

    Outcome: The software you already rely on, safe to change again.

  4. 12

    Remote engineering partnership (B2B)

    Outcome: More engineering capacity, with clear ownership and a clear contract.

All services

03 Working together

A registered company, in your time zone.

For companies in Serbia, and in Croatia and other EU countries, that want engineering under a clear B2B contract — working directly with the engineer who builds the system.

01Registered in Serbia
DEUS Engineering is the brand of FILIP VOLF PR DEUS INŽINJERING, which contracts and invoices B2B, company to company.
02CET working hours
Leskovac keeps Central European Time, like Zagreb, Vienna and Berlin — meetings, reviews and releases fit your working day.
03English and Serbian
Specifications, code review and documentation in English; conversations in Serbian whenever that is easier for your team.
04Remote-first
Work happens in your repositories, tickets and chat, with decisions and status written down rather than kept in someone’s memory.
Request a consultation

Scope, terms and pricing are agreed in writing before work begins.

04 Process

From first conversation to production.

A deliberate process that keeps you informed and in control at every step — no surprises about what is being built, or why.

  1. 01

    Discover

    We map the real workflow, data and constraints before any code is written, so the system fits how you actually work.

    OutcomeA shared understanding of the problem and a proposed scope.

  2. 02

    Design

    We design the structure, data model and security boundaries, and agree scope, priorities and trade-offs with you.

    OutcomeAn agreed plan and architecture.

  3. 03

    Build

    We build in focused increments you can see and use, with tests, review and security engineered in — not added later.

    OutcomeWorking software, reviewed as it grows.

  4. 04

    Launch & evolve

    We deploy to production, hand over cleanly, and stay available to evolve the system as your needs change.

    OutcomeA system in production, documented and supported.

05 Questions

Common questions.

Anything else — just ask.

Get in touch

What does DEUS Engineering do?

DEUS Engineering is a software engineering company from Leskovac, Serbia. It designs, builds, reviews and maintains custom software and SaaS, websites, APIs, applied AI, ML prototypes and cloud infrastructure for companies in Serbia, Croatia and the EU — twelve services, each with its own page. Its own production product is Pametni Advokat.

Do you work with companies in Croatia and other EU countries?

Yes. DEUS is a registered Serbian company that contracts and invoices B2B, works remotely in the Central European time zone and communicates in English or Serbian.

Which technologies do you work with?

Mainly TypeScript, React and Next.js on the front end; Node.js, PostgreSQL and Supabase on the back end; Python for AI and data work; Vercel, GitHub Actions and Docker for delivery. The choice follows the problem and what your team can maintain.

Can you join our existing team and codebase?

Yes. In a remote engineering partnership DEUS works in your repositories and through your code-review process, under a B2B contract. A short technical consultation is a good first step.

How do you use AI?

Inside well-defined tasks — drafting, checking, extracting and summarising — with model calls made from the server, as little data as the task needs, and a person approving the result. In Pametni Advokat, for example, the AI assistant prepares and checks; the lawyer decides.

How do you approach security?

As part of the architecture rather than a final step: access rules in the database, private storage, secrets kept on the server, security headers and dependency checks in CI. Pametni Advokat, for example, isolates every office’s data with PostgreSQL Row Level Security.

How do we start?

Email contact@deusengineering.com or use the contact form with a short description of what you want to build, how the work is done today and any constraints. If you would rather talk it through first, request a consultation.

Next step

Let’s talk about what you’re building.

Describe what you need built or fixed, how the work runs today and the constraints. You get clarifying questions or a first outline of the approach — by email, in English or Serbian.

Discuss your projectRequest a consultation