Intelligence.
Engineered.

Foundational developer infrastructure. A private desktop AI assistant, an open-source Go web framework, and a self-hosted identity server.

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Our Products

Foundational software for development teams. Each product represents a different answer to the same question: what would we build if we refused to compromise?

Plexon AI

Live

A private desktop AI assistant. 12 personas, 64 app connectors used with your own accounts, and one marketplace for skills, agents and tools. It builds boards and jobs that keep running, and your data stays on your machine.

A Plexon AI dashboard with a live world map, a space weather gauge and an air quality gauge, driven by two parameters at the top of the board.
The Plexon AI home screen: a prompt box, four suggested starts, and the workspace, settings and profile menu open on the left.
The knowledge graph in Plexon AI, showing people, notes and the connections between them, with the source file and line behind each fact.
The Personas panel in Plexon AI, listing twelve built-in personas with the skills, tools, agents and plugins each one activates.
The Plexon AI marketplace, browsing bundled tools with an Install button on each card.
Dashboards
Learn more

Iris Framework

Open Source

An open-source web framework for Go, built in the open since 2016. An application builder the compiler checks, typed path parameters, dependency injection, and 31 middleware packages in the same module. BSD-3-Clause licensed.

25,568

Stars

2,425

Forks

2016

Since

Learn more

Hellenic Identity

Live

A self-hosted OAuth 2.0 identity server: one Go binary, one PostgreSQL database, your domain. Users with a custom schema, filter-based groups, Ed25519 tokens with a public JWKS, and an admin panel.

The dashboard of the Hellenic Identity admin panel: user and group counts, cache entries, quick actions and the server's JWKS endpoint.
The Users page of the admin panel: a list of user records with their custom attributes, a search box and bulk actions.
The Attributes page of the admin panel: the user schema field by field, with type, required and indexed flags.
The Groups page of the admin panel: filter-based user groups with their terms.
Dashboard

Admin panel shown with sample data.

Learn more

Patrol

Open Source

Batched event delivery for Go. One producer buffers your errors and flushes them to Slack, Discord, Twilio, email, SQL or a server you run, each on its own.

  • Slack
  • Discord
  • Twilio
  • Email
  • SQL
  • HTTP client
  • HTTP server
The Events page of the Patrol Cloud console: a table of exception, error, info and debug events for checkout-api, each with its message, when it was captured, its field count and what it carries.
One event in the Patrol Cloud console: a declined charge with its captured, sent and received times, five fields including the request as JSON, and the start of a four frame stacktrace.
The overview of the checkout-api project in the Patrol Cloud console: ingest key count, creation date and time zone, then a bar per day of events over the last 30 days with a count per type.
Events

Patrol Cloud console, still in development, shown with sample data.

7

Destinations

1.27+

Go

BSD-3-Clause

Licence

Learn more

jev

Open Source

A Go client for Jev, the TypeSafe model that answers a question about your data with a probability instead of a paragraph. Send a ticket, a log line or a program's state and ask 3 kinds of question in one call. One of the first Go libraries for the model, with rate limits, retries and typed answers built in.

  • Yes or noNoul
  • Pick oneChoice
  • Rate itScore

3

Questions

1.27+

Go

MIT

Licence

Learn more

RNS

Multi-tenant push notification gateway for mobile applications.

Coming Soon
Plexon AI

One AI. Every part of the job.

A desktop assistant that works inside the apps you already use, signed in as you. It remembers what it learned, builds the boards and jobs you describe, and runs from your computer, where your data stays.

12 personas, each a different mind
64 apps, with your own accounts
One marketplace, 7,100+ items
Dashboards, workflows and scheduled jobs
Agents working in parallel
A stateless server that stores nothing
12
Personas
64
App connectors
156
Agents
The Plexon AI desktop app on its home screen, with prompt suggestions, the command palette bar, and the workspace and profile menu open.
Iris Framework

The compiler checks the wiring.

Iris is an open-source web framework for Go, built in the open since 2016. An application is assembled through 8 interfaces, each narrower than the last, so a step called out of turn fails the build rather than the deploy.

Typed path parameters, dependency injection, one central error map, and 31 middleware packages in the same module.

25,568
GitHub stars
2,425
Forks
2016
First release

Star and fork counts read from the GitHub API on 2026-09-21. Licensed BSD-3-Clause.

main.go
package main

import "github.com/kataras/iris/v14"

func main() {
    app := iris.New()

    app.Get("/", func(ctx iris.Context) {
        ctx.JSON(iris.Map{"message": "Hello, World!"})
    })

    app.Get("/greet/{name:string}", func(ctx iris.Context) {
        ctx.WriteString("Hello, " + ctx.Params().GetString("name"))
    })

    app.Listen(":8080")
}

Two routes, and the second one validates itself

The type in the path is not documentation. A request to /greet/ with something that is not a string never reaches the handler, and the same is true of every other built-in type and any macro you write yourself.

More about Iris

Why Hellenic

We do not build products to demonstrate what is possible. We build infrastructure developers depend on every day.

Private by Architecture

Privacy is not our policy. It is our architecture. Plexon's servers are stateless and hold no copy of your data, so we cannot read it even under compulsion.

Open Source at the Foundation

Iris has been open source since day one, with 25,568 stars and a decade of contributions. We earned trust the only way that matters: by shipping code anyone can read.

Performance as a Discipline

We do not optimize after the fact. Performance is a first-class design constraint, from high-throughput Go backends to AI pipelines that execute in parallel.

Built by Those Who Use It

Every product we ship is a product we use. Our founder created Iris. Our team builds on Plexon daily. We build from within, not from the outside.

Leadership

Gerasimos Maropoulos

Gerasimos Maropoulos

Founder & CEO

Creator of the Iris web framework. Over a decade of Go development. 25,568 GitHub stars on Iris alone.

LinkedIn
Christos Papadopoulos

Christos Papadopoulos

Co-Founder & CMO

People-focused creative and strategic direction. Brand storytelling and authentic marketing that connects ideas with people.

LinkedInInstagram Instagram

What we do

Engineering services from the team behind Iris and Plexon AI. We bring the same rigor to your problems that we bring to our own products.

AI Integration & Privacy Architecture

  • •Deploy AI systems with verifiable privacy guarantees
  • •Integrate LLMs into workflows without data exposure
  • •On-premise architectures for regulated environments
  • •Intelligent automation within your security perimeter

System Architecture & Engineering

  • •Design systems that perform at scale from day one
  • •Resolve architectural debt before it compounds
  • •Microservices, monoliths, or the right hybrid for your constraints
  • •Security-first design for finance, healthcare, and government

Team Enablement & Knowledge Transfer

  • •Hands-on workshops built around your actual codebase
  • •Go, AI tooling, and modern systems architecture
  • •Code review that transfers understanding, not just corrections
  • •Build internal capabilities that outlast the engagement

Rapid Product Development

  • •Production-quality MVPs delivered in weeks
  • •Transparent process with weekly demonstrations
  • •Architecturally sound from the first commit
  • •Clean handoff with full documentation when ready

Let's Discuss Your Architecture

No pitch deck. A direct conversation about your technical challenges with engineers who have shipped at scale. We will be honest about whether we are the right fit.

Get in Touch

Start a Conversation

Describe what you are building. We will be direct about whether our expertise is the right match.

Frequently Asked Questions

What people ask about Hellenic Development, its products, and how it works.

What is Hellenic Development?

Hellenic Development is a developer infrastructure company founded in 2025 by Gerasimos Maropoulos and Christos Papadopoulos. It builds and maintains five products: Plexon AI, a private desktop AI assistant; Iris, an open-source web framework for Go; Hellenic Identity, a self-hosted identity and access management server; Patrol, an open-source Go library that batches events and delivers them to Slack, Discord, Twilio, email, SQL or a server you run; and jev, an open-source Go client for the TypeSafe Jev model, which answers yes/no, pick-one and rate-it questions with a probability. The company also takes on consulting work in privacy-preserving AI, Go systems architecture, team training, and rapid product development, mainly for teams in finance, healthcare, and government.

Who founded Hellenic Development?

Gerasimos Maropoulos founded Hellenic Development and serves as its CEO. He created the Iris web framework for Go in 2016, which has since gathered 25,000+ GitHub stars, and he has worked in Go for over a decade. He publishes as "kataras" on GitHub. Christos Papadopoulos is the co-founder and CMO, responsible for brand and strategic direction.

What products does Hellenic Development make?

Hellenic Development ships five products. Plexon AI is a desktop AI assistant for Windows, macOS, and Linux that works inside 64 apps with your own accounts, runs 156 agents across 8 domains, and keeps your data on your own machine. Iris is an open-source web framework for Go, licensed BSD-3-Clause, with an application builder the compiler checks, MVC, and dependency injection. Hellenic Identity is a self-hosted OAuth 2.0 identity server with an admin panel, on one Go binary and PostgreSQL. Patrol is an open-source Go library, licensed BSD-3-Clause, that buffers events and flushes them in batches to Slack, Discord, Twilio, email, SQL or a server you run. jev is an open-source Go client, licensed MIT, for TypeSafe's Jev model: it sends a state and a set of questions and gets back a typed answer with a probability for each. One more product is in development: RNS, a multi-tenant push notification gateway.

Is Iris free to use?

Yes. Iris is open source under the BSD-3-Clause license, which permits commercial use, modification, and redistribution, provided the copyright notice travels with the code. There is no paid tier, no license key, and no cap on requests or environments. The source lives at github.com/kataras/iris and the API reference is published on pkg.go.dev. Iris was first released in 2016 and is maintained by Gerasimos Maropoulos through Hellenic Development, so the framework and the company that backs it share the same author.

Does Plexon AI send my data to a server?

No. Plexon AI runs on your machine and your files, chats, memory, and connector credentials stay there, encrypted on local disk. The Plexon server is stateless and holds no copy of any of it, so it cannot read it. App connectors sign in under your own account and call those apps from your computer. With 6 modes (Code, Plan, Ask, Auto, Orchestrator, Spec) and 10 providers to choose from, the one thing that never changes is where the work happens. Plexon AI is available for Windows, macOS, and Linux.

Can Hellenic Identity be self-hosted?

Yes. Hellenic Identity is designed to be self-hosted, which is the point of it: organisations that cannot send identity data to a third party run it on their own infrastructure, as one Go binary and one PostgreSQL database. It implements OAuth 2.0 with 4 grants, signs access tokens with Ed25519 and publishes the keys at a JWKS endpoint, and it encrypts every password in transit with AES-GCM under a key you share with the server. It ships with user and group management and an administration panel.

What services does Hellenic Development offer?

Hellenic Development offers four consulting services. AI Integration and Privacy Architecture covers deploying AI systems with verifiable privacy guarantees in regulated environments. System Architecture and Engineering covers Go backends, microservices, and security-first design. Team Enablement and Knowledge Transfer covers hands-on workshops in Go, AI tooling, and systems architecture. Rapid Product Development covers production-quality MVPs delivered in weeks. Engagements start at hellenic.dev/get-in-touch.

Does hellenic.dev track visitors?

No. The hellenic.dev website loads no analytics service, no tracking pixels, and no advertising cookies, and it sets no cookies of its own. The site is static HTML, so there is no session to follow you between pages and no profile to sell. The only information you ever send is what you type into the contact form and submit deliberately. Hellenic Development measures the site through Google Search Console instead, which reports search queries and indexing status without identifying anyone. The full policy is published at hellenic.dev/privacy.

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