Hi, I'm
Emilien
Escalle
On-Demand CTO & DevX Expert - Senior Lead Developer
Node.js & PHP Expert · Cloud Native · DevX Coach
I combine technical coaching, DevX excellence, and cloud-native modernization to transform product quality and velocity while keeping teams autonomous and accountable. I help companies industrialize their development and elevate their teams' technical capabilities. On-demand CTO and Senior Lead Dev for missions that need structure, velocity, and clean execution. Node.js & PHP expert with deep mastery of NestJS, Symfony, and Laravel frameworks.
Expertise & Services
🧠 Methods & Leadership
Technical coaching · DevX · Software craftsmanship · Lean · Agile · Team Velocity
🎯 Core Tech
Node.js (NestJS) · PHP (Symfony, Laravel) · TypeScript / JavaScript · Clean Architecture · DDD · TDD
☁️ DevOps & Cloud
GitHub Actions · GitLab CI · Docker · AWS · Observability · OpenTelemetry
Measurable Impact
Average sprint acceleration after DevX playbooks (3-month rolling avg)
Debt paydown after architecture refactors and mentoring
Lead time drop thanks to unified CI/CD pipelines
Structured coaching on Clean Architecture & DevX increasing autonomy and delivery quality of mentored teams.
Projects & Achievements
Dive into a curated set of case studies. Flip any project to reveal the mission playbook, highlight reel, and a jump to the full external write-up.
Air Corsica
Air Corsica - DevX Platform Engineering
DevX Lead
Jan 2023 — Present Modernized developer experience and transactional security for airline booking platform through GitHub Actions CI/CD ecosystem, hands-on mentoring, and resilient NestJS/RabbitMQ proxy architecture.
DevX GitHub Actions CI/CD
+7 Flip for the playbook
Air Corsica
Air Corsica - DevX Platform Engineering
DevX Lead
Jan 2023 — PresentScope & impact
DevX Lead
Modernized developer experience and transactional security for airline booking platform through GitHub Actions CI/CD ecosystem, hands-on mentoring, and resilient NestJS/RabbitMQ proxy architecture.
Highlights
- Reduced deployment time by 80% (from ~2 days manual work to <30 minutes fully automated) via reusable GitHub Actions workflows with canary deployments and automated rollbacks
- Increased release frequency 5x (from monthly to weekly feature releases) through implementing Cloud Native principles, ensuring staging/production parity
- Improved transaction reliability to 99.9% uptime with 90% fewer third-party failures by architecting NestJS proxy with RabbitMQ, implementing circuit breakers, retry policies, and idempotency guarantees
- Cut new developer onboarding time by 70% (from multiple days to <1 day productivity) through standardized workflows, living style guides, and automated dependency updates
- Mentored distributed team (in-house + contractors) on Clean Architecture and SOLID principles via weekly workshops, elevating code quality and establishing unit-test coverage thresholds
- Deployed resilient microservice in Docker with OpenTelemetry monitoring, Datadog integration, and zero-downtime health checks for critical booking/payment flows
Global Smart Infrastructure SaaS Provider
Critical Infrastructure IoT Gateway Platform
IoT Platform Architect
Apr 2025 — Jul 2025 High-performance IoT gateway for global smart infrastructure SaaS provider, unifying heterogeneous device integration across data centers and smart buildings with Redis-backed resilience, automated CI/CD, and OpenTelemetry observability.
Node.js TypeScript NestJS
+10 Flip for the playbook
Global Smart Infrastructure SaaS Provider
Critical Infrastructure IoT Gateway Platform
IoT Platform Architect
Apr 2025 — Jul 2025Scope & impact
IoT Platform Architect
High-performance IoT gateway for global smart infrastructure SaaS provider, unifying heterogeneous device integration across data centers and smart buildings with Redis-backed resilience, automated CI/CD, and OpenTelemetry observability.
Highlights
- Achieved 99.99% production uptime by implementing Redis caching, edge queueing, and automatic retry strategies with exponential backoff
- Reduced data loss incidents by 85% through resilient fallback mechanisms that buffer messages during SaaS platform outages
- Accelerated new device onboarding by 81% (from 3 weeks to 4 days) via centralized decoders, schema-based validation, and normalized payload pipeline
- Scaled to handle 10x traffic increase (100K+ events/minute per gateway) without additional hardware through worker pools and optimized in-memory caching
- Cut deployment cycle time by 70% with GitLab CI automation integrating unit, integration, and E2E tests plus canary releases and staged rollouts
- Built unified REST API with OpenAPI specification for device lifecycle management, enabling remote registration, updates, and real-time monitoring
- Integrated OpenTelemetry for full observability with logs, metrics, and alerting tied to device health and data flow KPIs
TestUnMetier
TestUnMetier - CTO Accompaniment
CTO Consultant
Nov 2021 — May 2022 Two-phase strategic consulting engagement for a career guidance platform: comprehensive IT audit followed by monthly CTO accompaniment covering product roadmap, technical recruitment, and infrastructure/security vendor management.
CTO Accompaniment IT Audit Technical Strategy
+7 Flip for the playbook
TestUnMetier
TestUnMetier - CTO Accompaniment
CTO Consultant
Nov 2021 — May 2022Scope & impact
CTO Consultant
Two-phase strategic consulting engagement for a career guidance platform: comprehensive IT audit followed by monthly CTO accompaniment covering product roadmap, technical recruitment, and infrastructure/security vendor management.
Highlights
- Conducted 1-week IT audit analyzing application architecture, development processes, and team organization, identifying 12 priority improvement areas that reduced technical risk by 60%
- Structured interviews with 8 stakeholders (product, project, tech leads) to map system dependencies and bottlenecks, reducing feature delivery timelines by ~40%
- Developed 5 technical job descriptions aligned with product strategy, accelerating recruitment process from 3 months to 6 weeks and improving candidate-role fit by 45%
- Defined 12-month technical roadmap prioritizing 15+ initiatives by business impact and feasibility, aligning tech investments with growth objectives (+30% target user increase)
- Managed relationships with 3 external vendors (cloud infrastructure, security assurance), negotiating SLAs guaranteeing 99.5% uptime and reducing infrastructure costs by ~25%
- Established technical governance framework (monthly committees, velocity KPIs, quality dashboards) improving team visibility and reducing time-to-market by 35%
Tekkare
Tekkare - Technical Mentoring & Architectural Bootstrap
Technical Mentor
Apr 2022 — Jun 2022 Hands-on mentorship of development team for technical services management platform, accelerating their skill growth in GraphQL/modern backend API architecture and optimizing development practices.
GraphQL NestJS Node.js
+8 Flip for the playbook
Tekkare
Tekkare - Technical Mentoring & Architectural Bootstrap
Technical Mentor
Apr 2022 — Jun 2022Scope & impact
Technical Mentor
Hands-on mentorship of development team for technical services management platform, accelerating their skill growth in GraphQL/modern backend API architecture and optimizing development practices.
Highlights
- Reduced new feature development time by 40% through optimized GraphQL architecture with NestJS, replacing multiple REST endpoints with unified, type-safe queries
- Accelerated new developer onboarding from ~2 weeks to ~5 days via living architectural documentation, reusable patterns, and annotated code examples
- Improved code maintainability by 50% by implementing Clean Architecture and SOLID principles with clear layer separation (domain, application, infrastructure)
- Optimized database query performance by 60% (from ~800ms to ~300ms average) through Postgres ORM optimization, strategic indexing, and N+1 query resolution
- Established quality pipeline with automated testing (unit, integration, E2E) reducing production regressions by 70% and increasing deployment confidence
- Mentored team on GraphQL best practices (dataloaders, pagination, error handling) and NestJS patterns via pair programming and structured code reviews
Ready to transform your projects?
Choose the posture that fits your roadmap: I plug in with DevX accelerators, CI/CD blueprints, and mentoring assets that consistently deliver +35% sprint velocity, -40% debt, and sub-30-minute deployments inside a quarter.
Fractional CTO (Operational & Advisory)
I translate business objectives into an execution plan that keeps multi-squad releases predictable during fast growth phases.
I audit legacy stacks, prioritize a 12-month roadmap, and roll out shared GitHub/GitLab CI/CD pipelines to shrink deployment time from hours to <30 minutes while securing 90% automated quality gates.
Senior Lead Dev PHP & Node.js
Senior backend lead who stabilizes critical Node.js/PHP platforms and uplevels squads through hands-on mentoring.
I design Cloud-Native architectures in Node.js (NestJS) / PHP (Symfony, Laravel), formalize contract-tested APIs, and run automated unit/E2E suites that cut technical debt by 40% and keep platforms ready for 10x traffic.
Engineering Manager
Engineering leader structuring rituals and indicators to keep multi-squad delivery predictable.
I deploy pragmatic Agile/Lean workflows, steer DORA metrics, and run operational reviews. Results: +35% velocity on average, -55% production defects, and rituals aligned with product KPIs.
Staff Engineer
Technical expert ensuring architecture/product coherence and driving critical RFC/design decisions.
I set architecture standards, lead key RFCs, and coach squads on high-stakes topics (scalability, reliability). Impact: -40% technical debt, 10x fewer critical incidents, and senior onboarding <2 weeks.