Octavian Cioaca
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.
DIRECTOR OF SOFTWARE ENGINEERING, 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 Director of Software Engineering at DOMSELARDI I ship systems, not slide decks. The two products below are live, and I run them.
- 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.
eIDAS · Tamper-evident
Flagship · High-risk AI · Compliance
REMIS
Prove what your AI did.
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
Anti-spoofing · Multi-sensor
Defence · Sensor integrity
Level Zero
Spoofed drone signals, made visible.
Normalisation layer for the defence industry that turns raw satellite, ground-station and radio sensor streams into one signed, verifiable product - so drone signal spoofing becomes detectable instead of invisible.
Visit site
levelzero.fr
SOFTWARE, CLOUD, SECURITY
About Octavian
Hello! I'm Octavian. I run software engineering at DOMSELARDI and I still write 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, 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
Proofcryptographic 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
Specification & standardsAPI contracts · engineering protocols · threat models · control registers
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 WorkflowAI-assisted coding, evaluation harnesses, cost and safety checks
Proof & AuditabilityEvidence bundles, verifier design, audit trails
Current Study & Development
I keep a study track running so these land properly, not superficially.
Rustasync services, CLIs, systems design, secure tooling
Databrickslakehouse architecture, Delta Lake, Spark, data/ML workflows
Omnigentagentic AI platform patterns, orchestration, evaluation, integrations
Study tracks & 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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145KUsers on a Bank Suite I Migrated
SOFTWARE ENGINEERING PROFILE
Architecture that survives production
Picking a stack is the easy part. The useful part is finding the risks, writing down who guarantees what, 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.
How I work
- Contracts first: APIs, schemas, RBAC boundaries, idempotency and audit trails
- Systems you can operate: observability, runbooks, incident response 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: data ingestion, 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
Auditable Product Architecture
Design and delivery of products where data location, export, audit trails, access controls, and verification are built in from the start.
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, improve security, and help put practical controls in place for GDPR, incident response and work in regulated sectors.
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, turning executive goals into architecture, delivery governance, and changes teams can actually ship and adopt.
EXPERIENCE
Work Experience
A delivery record across software engineering, cloud infrastructure, digital transformation, public-sector systems, and high-scale consumer platforms.
Director of Software Engineering
I set the technical direction at DOMSELARDI and I still write code, owning the architecture, the way we ship, security and the product direction. Recent work: an AI agent platform for a private equity firm taken from a single spec.md file to production; an eval harness that tests four production AI features against versioned golden datasets and stops a release if a score drops; hybrid retrieval on PostgreSQL (pgvector with an HNSW index fused with full-text search); AI governance that blocks approval while any generated number is unverified; the multi-cloud infrastructure behind the paid tier of a leading open-source agentic-development platform; and a defence sensor-data layer that makes drone signal spoofing detectable. I also write the rules for how AI coding agents work on our production code. I work in TypeScript/Node.js with Bun, React 19 on Next.js 16, Vue and SolidJS, Python with FastAPI and Celery, PostgreSQL/PostGIS, ClickHouse, MongoDB, Redis, pgvector, Kafka, Kubernetes with Helm and Terraform across AWS/Azure/GCP, AWS Bedrock, Playwright, and OpenTelemetry/Datadog observability.
Director, Industrial Digital Transformation & Software Engineering
I led distributed engineering teams of 10 to 30 across countries, migrating a bank's legacy finance suite and its 145,000 users to scalable cloud microservices. I contributed to 120+ technical hiring and senior-profile evaluations, improved delivery KPIs, grew the innovation budget by around EUR 4M, cut around EUR 2M of OPEX on an insurance product, ran the UiPath and Blue Prism RPA Centres of Excellence, and drove applied AI/ML work through Addstones. The stack covered Java/Django and Node.js/TypeScript services, Ruby on Rails, React/Angular/Vue/SolidJS frontends, PostgreSQL, Oracle, MongoDB, ClickHouse, Redis, Celery and Kafka pipelines, GraphQL, Kubernetes with Helm, Terraform and cloud-init across AWS/Azure/GCP, and Splunk/Datadog/Prometheus/Grafana/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, business workflows built on search, 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, including quality assurance and production support where reliability was critical. 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 consumer and community products, plus senior frontend support for e-commerce interfaces and campaigns built to convert.
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.
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.