Converting a JavaScript Project with Flow Annotations to TypeScript
A practical migration plan for moving a JavaScript codebase from Flow annotations to TypeScript while preserving delivery speed, test confidence, and type-safety improvements.
CTO, DOMSELARDI
Secure software, cloud, and AI for critical work
Hello! I'm Octavian. I've been taking unfair advantage of CSS and JavaScript since 2006, and lately of other people's GPUs. As CTO of DOMSELARDI I ship systems, not slide decks. Everything on this site is work I can show you.
- Cloud, AI & Platform Strategy
- Secure Software Delivery
PRODUCTS
Live software I build and operate
Two live systems I design, ship and run at DOMSELARDI. Hosted in France, portable by design.
Flagship · High-risk AI · Compliance
REMIS
AI operates. Evidence attests.
Evidentiary infrastructure that seals critical AI events into tamper-evident, eIDAS-timestamped proof bundles any auditor, regulator, or judge can verify independently.
Visit site
remis.fr
Space · Sensor data
Level Zero
Sensor data, standardised.
Normalisation layer that turns heterogeneous raw satellite, ground-station, and radio sensor streams into standards-compliant, application-ready products.
Visit site
levelzero.fr
SOFTWARE, CLOUD, SECURITY
About Octavian
Hello! I'm Octavian, and I'm a CTO who still writes code. I'm lazy in the useful way: I learn new tools fast because I hate doing the same thing twice. The part of a project I like is the messy middle - vague requirements, brittle legacy, nobody sure who owns what, and systems that have to keep running while you change them.
I've built and reviewed production systems in ecommerce, adtech, banking, insurance, luxury, gaming, hospitality, medtech, public sector and space/sensor data. That's where I learned what breaks. It shows up now in how I design evidence layers, developer platforms and recovery plans.
I enjoy design patterns, modular reusable code and interfaces that hit 60fps. I hire and mentor engineers, speak at events and advise startups. What I care about: clear priorities, systems you can observe, and code that still makes sense to the next person.
Full-Stack Product EngineeringTypeScript, Node.js, Vue.js, React/Next.js, Vite, Tailwind CSS, shadcn/ui
Data & PersistenceSQL/Postgres/PostGIS, Drizzle ORM, Supabase, TypeORM, SQLite, Snowflake, Databricks
Cloud & Infrastructure as CodeAWS, Azure, GCP, Kubernetes, Terraform, SST, cloud-init
Delivery & ObservabilityGitHub/GitHub Actions, pnpm/Turborepo, Changesets, ESLint/Prettier/Husky, Sentry, Linear, Slack, Notion, Cursor, Claude Code
Shared DOMSELARDI/Inetum StackDocker, Nginx, Let's Encrypt, Fail2ban, D3.js, ECharts, GSAP
Testing & QualityTDD/BDD, Mocha, Chai, Jasmine, Karma, PhantomJS, Playwright, Protractor, Jenkins
Earlier Stack (2006-2015)Go, Web Audio API, WebRTC, Web Components, FileReader API, RequireJS, Knockout.js, ExtJS, Backbone-era MVC, jQuery
PHP & CMS EcosystemSymfony, Zend Framework, CakePHP, Yii, Smarty, Composer, Magento, PrestaShop, Joomla, TYPO3, SilverStripe, WordPress
Java & Build ToolingTomcat, Maven, Ant, ActiveMQ, JavaServer Pages, Grails, Spring, Capistrano, Rake, Bower, Grunt, Gulp, npm
Tools & CollaborationJira, Confluence, Trello, Basecamp, Pivotal Tracker, Postman, Axure, Photoshop, Inkscape, Google Maps API, MaxMind GeoIP
Hosting & CMSVercel, Railway, Render, WP Engine, Magnolia, TYPO3, WordPress, Joomla, Magento
Security & MonitoringSIEM tooling, AWS Security Lake, Splunk, Datadog, OpenTelemetry
Platform PrinciplesREST APIs, JSON Schema, gRPC/protobuf, Object-Oriented Design, KISS principles
Product focusevidence layers · sensor provenance
Open sourceGitHub profile
Trust layercryptographic sealing · public verification
Operationsrunbooks · incident response
Deliveryarchitecture · implementation · recovery
Leadershipteams · hiring · governance
Frontend systemsframework architecture · UI delivery · accessibility (WCAG/WAI-ARIA) · SEO
Backend systemsservice boundaries · typed contracts
Data accessrelational data · geospatial data
AI integrationagents · retrieval · evaluation
Build systemsmonorepos · releases · quality gates
Governancesecurity · cost · adoption
LLM PlatformsFlowise open-source/SaaS Cloud contribution, LangChain Core, multi-agent systems, RAG
Model & Retrieval LayerModel catalog, guardrails, evaluations, Anthropic Claude SDK, OpenAI SDK, Google Generative AI/Gemini, Qdrant, FAISS/faiss-node
AI Developer WorkflowAssisted engineering workflows, evaluation harnesses, cost and safety checks
Proof & AuditabilityEvidence bundles, verifier design, audit trails
Current Study & Development
I keep a study track running. The point is to learn these properly, not to collect logos.
Rustasync services, CLIs, systems design, secure tooling
Databrickslakehouse architecture, Delta Lake, Spark, data/ML workflows
Omnigentagentic AI platform patterns, orchestration, evaluation, integrations
Certifications & continuing education
AWSSolutions Architect - Professional & Associate, Developer Associate, SysOps Administrator Associate
UiPath (RPA)RPA Academy diplomas - Solution Architect, Business Analyst, Developer Foundation, Infrastructure, Implementation Methodology, RPA Awareness (2018)
Data & databasesOracle Database 12c R2 SQL, SQL & relational database design
ContainersDocker - containers, Compose, and Swarm
Architecture & deliveryTOGAF / enterprise architecture, ITIL 4 Foundation, microservices & domain-driven design
Security & auditCloud security administration, CISA - Certified Information Systems Auditor
UiPath Academy RPA diplomas (2018); certification-track and professional-development coursework (Skillsoft), 2020-2021.
Recognition & awards
Cannes LionsShortlisted · 2010
Sabre European AwardsGold · 2010
Business Review AwardsOnline Project of the Year · 2010
IPRA Golden Trophy2009
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18+Years Of Experience
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27+Complex Projects
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12KVMs Provisioned for GenAI
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145KEmployees Served by One Migration
SOFTWARE ENGINEERING PROFILE
Architecture that survives production
Picking a stack is the easy part. The useful part is turning risk into contracts and cutting a migration into steps that won't take production down. A team should be able to explain the platform during an incident or an audit.
Evidence of engineering depth
- Contracts first: APIs, schemas, RBAC boundaries, idempotency and audit trails
- Systems you can operate: observability, runbooks, incident paths and cost visibility
- AI you can measure: retrieval, model routing, guardrails and evidence packages
- Modernization in steps, never a big-bang rewrite
Best-fit work
AI platform & LLM engineeringEvidence and provenance systemsCloud platform architectureSecure software for regulated systemsLegacy modernization and migrationTechnical due diligence and rescue
TECHNICAL ARTICLES
Engineering notes for production systems
SERVICES
From architecture review to production recovery
Advice and hands-on delivery for teams working on AI systems, cloud platforms, security and legacy change.
I work with organizations that need to understand their own systems again. That means naming who owns what, finding the risk nobody has written down, and sequencing the migration.
On AI and data I focus on what actually fails in production: ingestion boundaries, retrieval quality, model routing, evaluation and cost. Plus proof that a decision can be explained later.
On delivery: infrastructure as code, CI/CD, observability, monorepos and data access patterns, with engineering principles a team can actually follow.
01
AI Platform & LLM Engineering
Agent workflows, retrieval, model-serving pipelines, evaluations, and the cloud infrastructure automation that makes AI workloads repeatable, observable, and auditable.
02
Evidence-Aware Product Architecture
Design and delivery of products where data location, exportability, audit trails, access controls, and verification paths are part of the product contract from the beginning.
03
Cloud Architecture & Migration
I plan and deliver cloud migration programs with clear architecture decisions, migration sequencing, security controls, and cost discipline.
04
Cybersecurity & Compliance
I assess risk, strengthen security posture, and help align systems with practical controls for GDPR, incident response and regulated delivery.
05
Platform & Infrastructure Engineering
Custom software, APIs, cloud-native platforms, observability, high availability, data layers, automation, and delivery tooling for sensitive workloads.
06
Legacy Modernization & Digital Transformation
Migration and modernization of difficult legacy systems, connecting executive goals to architecture, delivery governance, and adoption that teams can actually ship.
EXPERIENCE
Work Experience
A delivery record across software engineering, cloud infrastructure, digital transformation, public-sector systems, and high-scale consumer platforms.
Chief Technology Officer
I set the technical direction at DOMSELARDI and write code on the critical path. I own the architecture, the delivery model, the security posture and the product direction. Recent work includes AI evidence, signed sensor-data provenance, a multi-agent data and analytics platform, real-time public-data ingestion, automated provisioning of 12,000 virtual machines across four cloud regions for the SaaS Cloud offering of a GenAI platform, and product/platform surfaces spanning web, backend, data, cloud, observability, secure operations, and developer tooling. Current stack: TypeScript/Node.js with Bun, React 19 on Next.js 16 (App Router), Vue and SolidJS, Tailwind CSS and shadcn/ui, Python with Celery, PostgreSQL/PostGIS, ClickHouse, MongoDB, Redis, Kubernetes and Terraform across AWS/Azure/GCP, AWS Bedrock alongside major model SDKs, Playwright, and OpenTelemetry/Datadog observability with Sentry - including contributions to Flowise open source and its SaaS Cloud offering.
Director, Industrial Digital Transformation & Software Engineering
Led distributed engineering teams of 10 to 30 on the migration of a legacy finance suite impacting 145,000 employees worldwide to scalable cloud microservices, connecting executive goals with architecture, delivery governance, and engineering execution. Contributed to 120+ technical hiring and senior-profile evaluations, improved delivery KPIs, increased the innovation budget by around EUR 4M, reduced OPEX for an insurance product by around EUR 2M, led RPA Centers of Excellence with UiPath and Blue Prism, and drove applied AI/ML innovation through Addstones. Platform estate spanned Java/Django and Node.js/TypeScript services, Ruby on Rails applications, React/Angular/Vue/SolidJS frontends, PostgreSQL, Oracle, MongoDB, ClickHouse, Redis, Celery pipelines, Kubernetes with Terraform and cloud-init across AWS/Azure/GCP, and Splunk/Datadog/OpenTelemetry observability.
Software Architect & Team Lead
Led frontend architecture and team delivery for a B2B software platform, combining Angular, Python, testing automation, Elasticsearch, Solr, semantic technologies and RDF/OWL data models. Focused on maintainable architecture, reliable build systems, search-backed enterprise workflows, and practical engineering standards.
Senior Software Technical Lead
Built and maintained a complex B2B SaaS application using AngularJS, Ruby on Rails, Jenkins, Protractor, automated testing, and modern frontend tooling.
Senior Software Technical Lead
Built and integrated AngularJS infrastructure for a responsive cloud application used to manage multimedia storage for Orange customers. Delivered maintainable features, architectural improvements, and production fixes.
Senior Software Technical Lead
Delivered and integrated user interfaces for French brands and organizations, including Château Chenonceau, An Nissa, Coemy Group, Emeraude, Mademoiselle Fashion, Geomass, Foah Swim, SLA Paris, Devialet, Plateforme Fenêtre, and Cake l'Atelier.
Senior Full Stack Engineer
Designed, coded, tested, documented, and supported business web interfaces for banking systems, with quality-assurance practices and production support for reliability-critical operations. Over the same period, also delivered full-stack interactive-media and digital-publishing front-ends, including dynamic content builders and campaign systems.
Senior Frontend Engineer
Frontend engineering for high-traffic gaming and community product experiences, plus senior frontend support for e-commerce user interfaces and conversion-focused campaign delivery.
Senior Frontend Engineer
Built campaign websites, landing pages, newsletters, and custom advertising solutions reaching more than 8.2 million users each month. Collaborated on digital campaigns for brands including Vodafone, P&G, ING, HP, Adobe, Erste Group, and OTP Bank.
Frontend Engineer
Created clear, conversion-oriented interfaces across desktop and mobile web. Worked with management and engineering through delivery, including frontend work for a UEFA Euro 2008 promotional betting system.
Frontend Engineer
Designed and developed web applications with JavaScript, HTML, CSS and PHP. Collaborated with designers on UI implementation and maintained ecommerce and presentation websites.
ALL 41 LINKEDIN RECOMMENDATIONS
Trusted by clients and partners
Excerpts from all 41 LinkedIn recommendations — senior leaders, clients, recruiters, and colleagues across software engineering, transformation, architecture, and complex technology delivery. Full texts on LinkedIn.
1 / 41
CONTACT
Discuss a project
Cloud architecture, custom software, security, transformation or technical due diligence. Tell me what you are trying to do and what is in the way.