Blockchain & Web3
Solidity · Foundry · OpenZeppelin
from$3,000
223 tests passed · 100% line and branch coverage
Senior engineering studio · EU
Blockchain, AI and Web, engineered by seniors. Proven, not promised.
Production software for companies that can't afford a junior experiment. Led by a tech lead with 20+ years of experience, backed by a network of 10 senior engineers.
Selected clients
sigmacode in numbers
- 20+
- 10
- 3
- 5
- 22
- 1 h
Services
Three pillars, one senior team.
One tech lead owns architecture and quality across all pillars. Your contracts, AI workflows and web platform are designed to work together from the start. And because software is never finished, the same team can stay on board under a retainer.
Blockchain & Web3
Smart contracts, tokens, NFTs, DAOs, dApps and on-chain analytics on EVM chains.
Solidity · Foundry · OpenZeppelin
AI & Automation
Assistants on your own data, AI agents, workflow automation and document processing.
RAG · Agents · Extraction
Web & Platforms
Multilingual websites, web apps, SaaS MVPs and customer portals.
Next.js · TypeScript · i18n
Care & Retainer
Maintenance, hosting, security updates and a monthly development budget.
Updates · Monitoring · Monthly budget
Selected client work
Platforms our clients run today.4
Three platforms our team designed and built, shown with our clients' permission.
GAGA Menjačnica
A Next.js platform for a currency exchange and gold & silver dealer in Novi Sad.
Read case study
RCIID
A platform for an Austrian blockchain forensics firm that presents crypto transaction tracing to lawyers, authorities and victims.
Read case study
Sisak Green
A bilingual (DE/EN) investor platform for an industrial waste-to-energy project in Croatia.
Read case studyShowcase projects
Don't take our word for it. Try it yourself.5
Live AI demos and smart contracts we built ourselves: clearly labelled as our own work, built to the same standards as client projects.
sigmacode Assistant
A multilingual sales and knowledge assistant that only knows this website's content. Answers stream in your language.
Try it liveDocument Q&A with citations
Upload a PDF or paste text and ask questions. Every answer links back to the exact passages it's based on.
Try it liveInvoice data extractor
Turn an invoice PDF or photo into validated, structured data, shown as a table and exported as JSON or CSV.
Try it liveSmart Contract AI Reviewer
Paste Solidity or pick one of our showcase contracts and get a structured, severity-ranked security pre-review.
Try it liveHow we work
From first call to long-term care.
Standard on client projects and on our own showcase work, never sold as an add-on.
01
Discovery
A free scoping call to understand your goals, users and constraints. We ask the uncomfortable questions early.
02
Plan
A written proposal with architecture, scope, milestones, risks and a fixed price or milestone budget.
03
Milestones
We build in short iterations with working demos. You get repository access and can give feedback at every step.
04
Handover
Deployment, documentation and a walkthrough for your team. Full IP transfer on final payment.
05
Care
Optional retainer for maintenance, hosting, security updates and continuous improvement.
Quality standards
Code review
Every change is reviewed by a senior engineer before it ships.
Automated tests
Unit, integration and end-to-end tests; fuzz and invariant tests for smart contracts.
Security review
Threat modelling, dependency checks and OWASP-minded reviews; Slither for Solidity.
Full IP transfer
You own the code, the infrastructure and the documentation on final payment.
Mutual NDA, ready to sign
Download our mutual NDA on the contact page: confidentiality from the first conversation.
EU company
Contracts and invoices via SANICURA d.o.o., Croatia, under EU contract law with reverse-charge invoicing.
Why sigmacode
Senior quality without big-agency overhead.
An honest comparison of the three common ways to get software built. Each has its place; this is where we fit.
| — | sigmacode.io | Freelancer marketplaces | Large agencies |
|---|---|---|---|
| Seniority | Senior engineers only, led by a tech lead with 20+ years of experience | Varies widely from profile to profile | Senior leads, often with junior-heavy delivery teams |
| Accountability | One technical owner from first call to handover | You coordinate individual freelancers yourself | Account managers between you and the engineers |
| Breadth | Blockchain, AI and Web from one team | Usually one specialism per person | Broad, sometimes via subcontractors |
| Overhead | Lean team, low overhead | Low overhead, but management effort is on you | Higher overhead built into rates |
| Contract & IP | EU company, NDA and full IP transfer as standard | Depends on the platform's terms and the individual | Usually solid, often with longer negotiations |
| Communication | Direct access to the engineers, in EN, DE, HR or SR | Direct, availability varies | Structured, but often indirect |
Seniority
Accountability
Breadth
Overhead
Contract & IP
Communication
Commitments
What you can hold us to.
The commercial side of working with us, in plain words. The binding details are in the written proposal.
Fixed price means fixed
For fixed-price projects, the price in the written proposal only changes through a change request that you approve.
Pay per milestone
You pay for milestones that have been delivered and demonstrated to you.
30 days of free aftercare
For 30 days after final acceptance we fix defects and make small optimisations (up to 4 hours in total) free of charge, e.g. copy, styling, performance or usability tweaks within the delivered scope.
Your code, your IP
Full IP transfer and repository ownership on final payment. No lock-in, documented handover.
NDA before details
We sign an NDA before you share anything confidential, yours or ours.
A reply within an hour
Every enquiry gets a personal reply from a senior engineer within an hour on working days.
Evidence
Every claim on this page, with its proof.
The small numbers next to a claim lead here. Each entry links to something you can check yourself.
EU company: SANICURA d.o.o., Croatia
Company name, registered office, OIB and VAT ID are in the imprint.
Mutual NDA, ready to sign
Our mutual NDA is a public PDF. Read it before the first call.
Public starting prices
Every package and sprint has a published starting price, in USD and EUR.
Platforms our clients run today
Three client platforms, live on their own domains and shown with the clients' permission.
AI you can try right now
Four AI demos run on this site, in your browser, without an account.
223 tests, 100% line and branch coverage
The showcase contracts are open source. Tests, coverage and CI runs are in the public repository.
Have a project in mind?
Tell us what you're building. A senior engineer replies within an hour on working days — then you get an honest assessment, a clear scope and a fixed-price or milestone proposal, usually within a few working days.
Prefer to write first? Write to us
You'll talk directly with Ing. Ismet Mesic, Tech lead.