Romain Diegoni

Open to Opportunities

I help engineering teams ship faster with agentic workflows.

15+ Years building software

Agentic Workflow builder

2,500+ LinkedIn followers

10x Faster delivery

See my work Book a Call

<About />

From trading floors to agentic workflows

I started building trading systems at Societe Generale and Natixis, then moved to London where I helped TrueLayer ship their first payment product and built a design system used by 8+ teams. I founded SubVortex, a decentralized subnet in the Bittensor ecosystem, and took it from zero to a fully operational product. 15+ years across investment banking, fintech, blockchain, and developer tooling shaped how I think about software: every line of code should serve the business and the people using it.

Today I design agentic workflows that let AI agents handle repetitive engineering work so your team focuses on problems worth solving. I wire these into existing codebases and CI/CD pipelines, turning days of work into hours. The goal is simple: multiply your engineering output without multiplying your headcount.

I take on full-time roles, contracts, and short engagements. Hands-on development, architecture reviews, technical advisory, or early-stage brainstorming. If your team should be shipping faster, let's talk.

<Experience />

15+ years building trading systems, platforms, and agentic workflows

Founded and shipped a production decentralized subnet in the Bittensor ecosystem, giving developers programmatic access to distributed nodes for network queries.
Owned the full stack as product owner and principal engineer: system architecture, protocol design, incentive mechanics, and operational reliability.
Built Python backend services handling node discovery, routing, scoring, and performance optimization, plus React dashboards for real-time subnet health monitoring.
Built detection tooling to catch abnormal node behavior and mitigate network-level attacks, integrating Rust/Substrate blockchain primitives with off-chain services.

PythonReactRustSubstratePolkadotBittensorDistributed SystemsDocker

Joined as one of the first 10 engineers, providing senior full-stack development to founders launching and scaling toward exit.
Shipped customer-driven features that lifted satisfaction ratings and built a new capability that increased user engagement across the platform.
Set up CI/CD pipelines that cut deployment time and raised code quality, and added E2E tests covering full system functionality and user flows.

TypeScriptReactNext.jsPythonFastAPIPostgreSQLGitHub ActionsDocker

Joined as one of the first 15 engineers and grew into a lead managing direct reports serving 8+ internal teams.
Built the V1 payment product that contributed directly to early fundraising milestones.
Led the internal Design System: 90 components, 3 themes, used by 8+ cross-functional teams to ship faster.
Built the V2 console with Domain-Driven Design and shipped a donation SPA within weeks to support charities during COVID.

TypeScriptReactC#.NETKubernetesDockerPostgreSQLDomain-Driven Design (DDD)

Co-founded and built Anabode, a cross-platform property management app for landlords, tenants, and service providers.
Wrote a shared Xamarin Forms codebase targeting iOS and Android, storing all assets as SVG in S3 to minimize platform-specific code.
Provisioned AWS infrastructure: Cognito, S3, Lambda, Step Functions, and DynamoDB.

C#XamarinNode.jsAWS

Designed and built a global bidding engine that supports injection of configurable auction models.
Built a complete reverse auction model from scratch.
Migrated the system to a microservices architecture with APIs and web components, making it extensible for new marketplace clients.

C#ASP.NET MVCAngularJSTypeScriptRabbitMQElasticsearch

Wrote custom FxCop rules to detect security gaps (SQL injection, plain-text passwords, LDAP injection) enforced at build time across .NET projects.
Set up continuous integration for 120 Java and .NET projects.
Built a WCF gateway for Excel-to-ServiceNow import and extended the internal deployment tool with rights management and multi-platform support.

C#.NETJavaWCFCI/CDEnterprise Architecture

Built a market-making application for Money Market traders from scratch: GUI, negotiation engine, contributor, and scheduler.
Built an automated RFQ statistics system that surfaced unanswered quotes, giving traders visibility into missed flow.
Rebuilt front office trading UIs for Forex Market Makers, cutting latency and improving ergonomics.

C#WPFT-SQLOracleMultithreading

Owned 6 of 10 applications in the perimeter, working independently across the full stack.
Built 15 batch processes for recomputing fund net values, stock counts, dividend distribution, and capital adjustments.
Built Winform tooling for middle office to validate Bloomberg quotations, and web services pulling Reuters securities data.

C#ASP.NETT-SQLOracle

<Services />

How I can help you

Full-Time Engineering

Available

Senior or staff-level role embedded in your team. I own features end-to-end, improve architecture, and raise the bar on engineering practices.

Full-stack TypeScript, React, Node.js, Python
System design, API architecture, design systems
15+ years across fintech, trading, and developer platforms

Contract Engineering

Available

Short or medium-term engagements for teams that need senior firepower now. I ship production code and leave the codebase better than I found it.

Available for 3 to 12 month contracts
Hands-on development, not just advisory
Remote-first, London-based

Agentic Workflow Design

Available

I design and build AI agent systems that plug into your existing codebase and CI/CD pipeline. Your team stops doing repetitive work and starts shipping what matters.

Custom agent architectures tailored to your stack
Integration with existing CI/CD and developer tooling
Measurable reduction in manual engineering work

Technical Advisory

Available

Architecture reviews, tech stack decisions, and engineering strategy for founders and CTOs. I help you avoid the mistakes that cost months.

Architecture and code reviews
Tech stack evaluation and migration planning
Team structure and engineering process consulting

Talks and Workshops

Available

I speak about agentic workflows, AI-augmented engineering, and building systems that scale. Available for conferences, meetups, and private team workshops.

Agentic AI for engineering teams
Building developer platforms and design systems
From investment banking to startup: lessons in system design

Courses and Training

Available

Hands-on training for engineering teams adopting AI tooling and agentic workflows. I teach your engineers to build and maintain agent systems themselves.

Practical, project-based curriculum
Tailored to your team's stack and maturity level
From prompt engineering to full agent orchestration

Podcast and Media

Available

Available for podcast appearances, interviews, and written features on AI engineering, developer experience, and the future of software development.

15+ years of stories from trading floors to startups
Practical takes on AI-augmented engineering
Founder perspective on decentralized systems

<FeaturedWork />

Projects I've built or led from concept to production

SubVortex

Decentralized subnet in the Bittensor ecosystem providing programmatic access to distributed nodes. Founded, built, and delivered as a fully operational product.

PythonReactRustSubstrateBittensor

TrueLayer Design System

Internal design system with 90 components and 3 themes, used by 8+ cross-functional teams to ship faster and maintain visual consistency.

ReactTypeScriptStorybookDesign Tokens

romaindiegoni.com

This portfolio site. Static Astro build with LinkedIn data pipeline, brand token system, and Lighthouse 90+ scores.

AstroTypeScriptCloudflare Pages

<Contact />

I'm always open to discussing new projects, engineering challenges, or opportunities to collaborate

Book a Call Send a Message

Romain Diegoni

<About />

<Experience />

SubVortex

Aer Compliance

TrueLayer

Anabode

Perfect Channel

AXA Investment Managers

Societe Generale Corporate and Investment Banking - SGCIB

Natixis

<Services />

Full-Time Engineering

Contract Engineering

Agentic Workflow Design

Technical Advisory

Talks and Workshops

Courses and Training

Podcast and Media

<FeaturedWork />

SubVortex

TrueLayer Design System

romaindiegoni.com

<Contact />