Do you work fixed-price?

For a first engagement, often yes — several services are fixed-price products you can pay for online, and larger builds start with a smaller, fixed-scope phase so you can evaluate the team before any long-term commitment. Ongoing delivery then runs on a monthly model.

Is AI writing our code?

Engineers are. We read and write JS/TS, Python, PHP and C++ ourselves and debug by hand — AI is an industrial-grade tool applied under architecture-first discipline, TDD and code review. That is also why companies bring us their AI-generated prototypes to make production-grade.

Can you take over an existing codebase?

Yes — we audit first, put the findings and a plan in writing, then stabilize: tests, CI/CD, observability, then features. We have taken over everything from 14-year-old backends to prototypes generated last month.

Senior and European — led from Ireland by the founder-CEO, with engineers across Europe. We work EU business hours with full US-morning overlap. Fluvius is a US company (Fluvius USA Inc, California), shipping since 2017 for clients including governments and a UAE retail bank.

How fast can we start?

Start the conversation on the site — two minutes of questions, or plain email. You get a written plan and a number before you commit to anything; a call happens only if you want one.

Software Development Services — Senior Team

Every service we sell, on one page.

Five groups, 32 doors. Which one you come through depends on the pressure you are under today — the team behind them is the same.

AI & AGENTS

9 SERVICES

AI Strategy Consulting

A fixed-price consulting engagement, payable online: from "we should use AI" to a costed, buildable plan your board can approve.

Pay & book · $900

MCP Servers, Plugins & AI Skills

Put your product inside ChatGPT, Claude and the agents your customers already use — MCP servers, plugins and skills, built by a team that ships them for itself.

AI Agent Development

Production agents with defined boundaries and measurable ROI — not demos. An Agent Pilot in 30 days.

Agent Pilot · 30 days

Voice AI Agents

Phone, support and sales calls answered 24/7 by a voice agent that knows your business and hands off cleanly.

Video AI Agents

Digital humans and AI avatars that present, teach and sell on camera — built on real production cases.

Chatbots & RAG

Assistants that answer from YOUR knowledge base, with retrieval you can audit — and a clear line to agents when you need one.

Generative AI Apps Development

Applications assembled by LLMs at runtime — the screen and the workflow built on demand, the next product category.

AI Integration

AI into your existing product and workflows this quarter — scoped as product features with usage metrics attached.

AI Business Process Automation

From Zapier/Make/n8n hacks to production automation — pipelines that survive volume, audits and staff turnover.

BUILD & DESIGN

7 SERVICES

E-commerce Development

Development and optimization of running stores — speed, checkout, payments, integrations and migrations that protect revenue.

Featured

Full-Stack Web Development

Web products built end to end by senior, AI-tooled engineers — with quality you can verify, not take on faith.

Mobile App Development

Native iOS and Android, or cross-platform where it earns its cost — shipped to both stores by one team.

Product Rescue

A stalled or vibe-coded build, made production-grade — we take over where a vendor or a prototype stopped.

Reserve a start slot

Next available start: Mon, 07 Sep 2026 (Week 37)

UI/UX & Product Design

Design systems and conversion-focused product design for the AI era — interfaces engineers can build from.

UX review · $390

3D, Animation & Computer Vision

Real-time 3D characters, animation and vision pipelines — medical avatars, face tracking, AR experiences.

Product & Technology Consultation

Cost, stack and roadmap for your app — before you build. A paid session plus a written blueprint, bookable online.

Pay & book · $490

TEAMS & SCALE

7 SERVICES

Product Engineering Team

A smaller senior team that ships the same roadmap — AI-tooled engineers at roughly 40% less than the in-house math.

Reserve a start slot

Next available start: Mon, 31 Aug 2026 (Week 36)

Staff Augmentation

Senior engineers embedded in your team, on your repos and your process — productive in the first week.

Reserve a start slot

Next available start: Mon, 14 Sep 2026 (Week 38)

Legacy Modernization

Staged, AI-accelerated, behaviour-preserving modernization — with senior architectural oversight on every step.

Custom ERP, CRM & Operations

Systems shaped around how your company actually runs — built, run and continuously developed for a monthly fee.

Monthly plans

DevOps & Cloud Engineering

CI/CD, infrastructure as code, observability and cloud spend that stops surprising you.

Data Engineering & AI Data Readiness

Most AI pilots die on bad data. Pipelines, models and an AI Data Readiness Audit that make yours survive.

API Integrations

Payments, CRM, fulfilment — anything with an API, wired in so it stays wired in. Stripe, PayPal, ChargeBee, Clover.

HARDWARE & IOT LAB

4 SERVICES

One roof, one accountable team — the lab has its own page.

Embedded Firmware

C++ firmware for machines that cannot fail — tunnel-boring machine control, solar power stations, industrial sensors.

IoT & Edge AI

Connected devices with on-device intelligence — from sensors to smart power stations, hardware and cloud in one team.

Featured

Hardware & PCB Design

Schematics, PCB layout and enclosure design from our hardware lab in Chisinau, Moldova.

Prototyping, Assembly & Testing

Prototype to small batch to FCC/CE/UL/RoHS testing — one lab, one accountable team.

Hardware & IoT Lab

Design, PCB, firmware, assembly and certification testing under one roof — wired to our software teams.

AUDIT & HUMAN OVERSIGHT

5 SERVICES

AI builds. Humans verify.

The group promise — senior engineers verify what AI produces

Protection from AI Threats

Deepfake fraud, AI phishing, malicious bots, prompt injection, shadow-AI leakage — assessed and monitored by humans.

Assessment · $390

Code & Developer Audit

An independent human audit of the code — and of the team or vendor that produced it. Fixed price, in writing.

Pay & book · $1,900

AI Code Cleanup & Cloud Cost Optimization

AI-generated code refactored by senior engineers — leaner RAM, lighter DB load, a smaller cloud bill.

Paid audit · $1,900

Code Review as a Service

A senior human engineer on every pull request, as a monthly subscription — before it reaches production.

Monthly subscription

QA & Test Automation

Human exploratory and release QA plus automated regression in CI/CD — two disciplines, one service.

Software development services, delivered the same way every time

Fluvius is a senior software engineering team that uses AI as an industrial-grade tool. We work with companies of roughly 10–100 people who have paying customers and more roadmap than capacity — and with banks, ministries and industrial firms where reliability is the whole point.

One team behind all thirty-two

These are entry points rather than separate departments. Underneath every one of them sits the same team of senior engineers under the same architecture-first process. Which door you come through depends on the pressure you are under today.

How engagements usually start

Almost always with something small and fixed in scope — a paid consultation, an audit, one integration, one journey. Several services are products with a public price you can pay for online today. You get a written plan and a number before committing to anything larger.

What you own

Everything we produce, at every stage: source code, documentation, infrastructure and credentials. That includes audit reports, even if you take one and go elsewhere. Nothing about the engagement is designed to make leaving hard.

AI builds. Humans verify.

Advanced Claude Code workflows in experienced hands mean the same scope takes fewer engineer-hours. The other half of the promise is the whole fifth group of services: senior engineers independently verifying code, teams, security and quality — ours and anyone else’s.

Proof you can check

A 100% Job Success Score on Upwork, verified reviews on Clutch, and ten years of clients who left only when a project naturally ended. Named projects run from a UAE retail bank to the Qatar Ministry of Foreign Affairs app.

The same discipline on every service.

The one behind ten years of happy clients — since 2017, with clients leaving only when a project naturally ended.

Model

Fixed-price products to start, a monthly model to continue — no recruiting, no management overhead.

Team

Senior engineers only, multiplied by advanced Claude Code workflows.

Process

Architecture-first, TDD, structured code review and CI/CD — the same since 2017. System design is signed off by a senior architect on every project.

Communication

Direct Slack access to the engineers, weekly demos, Agile/Kanban. Email-only is welcome too.

Stack

React, Next.js, TypeScript, Vue · Node.js, Python, PHP, PostgreSQL, MongoDB · React Native, Flutter · C++ & embedded · AWS, DigitalOcean.

Thirty-two services. One senior team.

WHERE MOST ENGAGEMENTS START

Code Review as a Service

AI Strategy Consulting

Product Engineering Team

E-commerce Development

IoT & Edge AI

Protection from AI Threats

AI Agent Development

Product & Technology Consultation

Every service we sell, on one page.

AI & AGENTS

AI Strategy Consulting

MCP Servers, Plugins & AI Skills

AI Agent Development

Voice AI Agents

Video AI Agents

Chatbots & RAG

Generative AI Apps Development

AI Integration

AI Business Process Automation

BUILD & DESIGN

E-commerce Development

Full-Stack Web Development

Mobile App Development

Product Rescue

UI/UX & Product Design

3D, Animation & Computer Vision

Product & Technology Consultation

TEAMS & SCALE

Product Engineering Team

Staff Augmentation

Legacy Modernization

Custom ERP, CRM & Operations

DevOps & Cloud Engineering

Data Engineering & AI Data Readiness

API Integrations

HARDWARE & IOT LAB

Embedded Firmware

IoT & Edge AI

Hardware & PCB Design

Prototyping, Assembly & Testing

Hardware & IoT Lab

AUDIT & HUMAN OVERSIGHT

Protection from AI Threats

Code & Developer Audit

AI Code Cleanup & Cloud Cost Optimization

Code Review as a Service

QA & Test Automation

Software development services, delivered the same way every time

One team behind all thirty-two

How engagements usually start

What you own

AI builds. Humans verify.

Proof you can check

The same discipline on every service.

The track record behind these services