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Software
engineering
partner.

CONSOLE / AI CHAT● live chat
IN PRODUCTION FOR

Where the leverage shows.

Senior engineers whose output is multiplied by AI infrastructure — under an engineering discipline that predates the hype.

01
Advanced AI
Claude Code workflows at an advanced level — industrial-grade tooling.
02
Human judgment
Architecture, security and quality are decided by engineers.
03
Experienced hands
Production-grade delivery, ten years running.
14-YEAR LEGACY GO BACKEND → NODE.JS
FASTER
~24 mo typical rewrite quote
6 mo fluvius — one senior, AI-assisted
The engineer read the legacy code himself and used AI to accelerate translation, tests and review.
Services — where most engagements start
In clients' own words

Ten years of reviews we did not write.

★★★★★  5.0
“They understood a difficult brief and delivered everything professionally, on time and on budget. I hope we have the opportunity to work together again soon.”
Westfield — UX improvement
Verified Upwork review
★★★★★  5.0
“Excellent communication at every step, from initial consultation to incremental delivery. The development was delivered to expectation and in a professional manner. I look forward to working with this team again.”
Client — app platform build
Verified Upwork review
★★★★★  5.0
“Clean code, clear documentation, great communication and able to work well with a minimal brief and a constantly changing UX design.”
Client — HTML5/JS product build
Verified Upwork review
100% Job Success on Upwork · 4.9 / 5 on Clutch
Who we are

Trusted by governments, banks and funded startups.

Fluvius is a senior software engineering team. We read and write the code ourselves — JS/TS, Python, PHP, C++ — and AI multiplies that output while architecture, security and quality stay in experienced hands. Shipping since 2017, led from Ireland, with senior engineers across Europe.

200+
Clients served
7+
Years clients stay with us
Since 2017
Fluvius USA Inc · California
4.9 / 5
Verified Clutch reviews
Many of our clients have been with us for 7+ years straight, and the Upwork and Clutch figures are independently verifiable.