Senior Full-Stack Developer & Senior ESG Consultant

TiagoMigueldeSeixas

Built for complexity

Lisboa, Portugal|Remote EU

Years Dev

Years ESG

Projects

Clients

Schedule a Call Get in Touch

About Me

A unique profile combining advanced technical skills with deep regulatory and sustainability expertise.

Development

Senior Full-Stack Developer with proven experience building high-performance web and mobile applications (React, React Native, Node.js, TypeScript) for international B2B clients in fintech, insurance, IoT, and energy. Frontend team leadership and junior developer mentoring.

ESG & Sustainability

Senior ESG Consultant with 12+ years in sustainability strategy, corporate responsibility, and regulatory compliance. Proven track record in double materiality assessments, CSRD/ESRS frameworks, and sustainability strategies for enterprise clients in banking, payments, hospitality, and industry.

Skills & Technologies

Languages

JavaScript (ES6+)TypeScriptPythonHTML5CSS3

Frontend

React.jsReact NativeNext.jsReduxTailwind CSSChart.jsD3.js

Backend & Data

Node.jsExpress.jsWebSockets (Socket.io)REST APIsMongoDBPostgreSQLRedis

Infrastructure

AWS (S3, EC2, Lambda)Firebase/FirestoreVercelGitCI/CDDocker

Methodologies

Agile/ScrumCode ReviewTechnical MentoringAPI Architecture Design

ESG & Sustainability

CSRD/ESRSGRI StandardsEU TaxonomyVSMESFDRSDGsDouble Materiality AssessmentStakeholder EngagementGap AnalysisSustainability ReportingESG Strategy & Action PlansClimate Transition Planning

Professional Experience

Development

Senior Frontend / Mobile Developer

Studio Graphene

Sep 2021 — Present

Development agency for international B2B clients. Frontend development leadership and junior developer mentoring.

Led frontend teams of 2-4 developersCross-platform web & mobile (React, React Native)Sectors: Automotive, Insurance, Banking, IoT, Energy

Full-Stack Developer & Founder

Tiago Seixas Studio

2019 — 2025

Independent technical practice focused on web platforms and SaaS tools with ESG/sustainability specialization.

Proprietary ESG SaaS platform (CSRD/GRI/ESRS)Full stack: React.js, Node.js, MongoDBData pipelines for sustainability reporting

ESG Consulting

Senior ESG Consultant

Sustentare | ESG for Companies

Apr 2021 — 2025

Sustainability consulting for large organizations and SMEs. CSRD compliance projects, materiality processes, and strategic ESG advisory.

Clients: SIBS, Banco BPI, Real Hotels Group, KLX GroupDouble materiality assessments (CSRD/ESRS)C-suite stakeholder engagement

Founder & ESG Consultant

CORE | Sustainability & CSR

Nov 2013 — 2025

Boutique consultancy at the intersection of sustainability strategy and technology.

Clients: Galp, SIBS, BPI, AKI (Adeo Group)CSR strategy, shared value, sustainability programsBanking, energy, payments & retail sectors

Selected Projects

A selection of work across development and ESG consulting

Manufacturing · Food & Cosmetics

Confidential client

Industrial Manufacturing Platform

Frontend lead on a web and mobile platform for managing industrial equipment globally. Defined tech stack, led team, and delivered custom components using Atom methodology.

ReactReact NativeReduxNode.jsPostgreSQLTypeScriptAWS

Automotive · UK

Confidential client

Automotive Marketplace & Fleet

Cross-platform mobile development for a leading UK automotive dealership, plus real-time fleet visualization dashboard with interactive charts and live tracking.

React NativeReact.jsTypeScriptChart.jsD3.jsFirebase

Procurement · Public & Private

Confidential client

Public Sector Procurement Platform

Re-platforming of a procurement solution connecting buyers and suppliers across public and private sectors. New features including CFP, CDP, and Contract Register.

React.jsNode.jsTypeScriptGraphQLPostgreSQLAWS

Industrial IoT · Energy

Confidential client

Industrial IoT & Energy Monitoring

Digital monitoring platform with real-time visibility, machine learning insights, and operational dashboards for industrial and energy sectors.

ReactReact NativeNode.jsTypeScriptAWS IoTCypressServerless

Automotive · Remarketing

Confidential client

Real-Time Live Auction Platform

Web and mobile live-streaming auction platform. Led JS-to-TypeScript migration, built real-time bidding with audio sharing, chat, and live visualization.

React.jsReact NativeViteTailwindNode.jsWebSocketsServerless

Fintech · Asset Management

Confidential client

Alternative Investment Platform

Platform for alternative investment agencies to share and access fund information, reducing onboarding from months to days. UX-driven development with micro-services.

React.jsTypeScriptNode.jsPostgreSQLAWS LambdaCypressOkta

Insurance · UK

Confidential client

Cross-Platform Insurance App

Led frontend development of a cross-platform mobile application for real-time claims processing, policy management, and customer communication.

React NativeTypeScriptReduxREST APIs

Tech · Agentic Engineering

Confidential client

AI-Powered Mobile Engineering

React Native project leveraging Agentic Engineering principles. AI-assisted code generation with custom development prompts for accelerated delivery and automated testing.

React NativeAgentic EngineeringAI/ML ToolingAutomated Testing

Sustainability · Tech

ESG Reporting SaaS Platform

Proprietary platform for ESG data collection and regulatory reporting. Algorithmic mapping of sustainability standards (CSRD, GRI, ESRS).

Next.jsPostgreSQLPrismaAgentic Engineering

Payments · Enterprise

SIBS

ESG Strategy & Sustainability Reporting

ESG strategy development and sustainability reporting for Portugal's leading payments infrastructure company. Double materiality assessment aligned with CSRD/ESRS frameworks.

CSRD/ESRSGRIDouble MaterialityStakeholder Engagement

Banking · Enterprise

Banco BPI

Sustainability Strategy & CSRD Compliance

Sustainability strategy and regulatory compliance advisory for one of Portugal's largest banks. CSRD readiness assessment and ESG reporting framework implementation.

CSRD/ESRSGRISustainability StrategyESG Reporting

Hospitality · Enterprise

Real Hotels Group

ESG Reporting & Materiality Assessment

Double materiality assessment and sustainability reporting for a major Portuguese hotel group. Stakeholder engagement with C-suite and operational teams.

Double MaterialityCSRD/ESRSStakeholder EngagementForest

Industry · Manufacturing

KLX Group

Sustainability Program & ESG Advisory

ESG advisory and sustainability program development for an industrial manufacturing group. Materiality process and regulatory alignment.

CSRD/ESRSGRIMaterialityESG Advisory

Energy · Enterprise

Galp

CSR Strategy & Shared Value

Corporate social responsibility strategy and shared value programs for Portugal's leading energy company. Sustainability strategy and stakeholder engagement.

CSR StrategyShared ValueSustainabilityStakeholder Engagement

Robotics · Industry

Introsys

ESG Assessment & Sustainability Roadmap

ESG assessment and sustainability roadmap for an industrial robotics and automation company. Alignment with emerging regulatory frameworks.

ESG AssessmentCSRD/ESRSSustainability Roadmap

Retail · Enterprise

AKI (Adeo Group)

Sustainability Strategy & CSR Programs

Sustainability strategy and CSR program development for a leading retail brand within the Adeo Group. Shared value creation and community impact programs.

CSR StrategyShared ValueSustainability Programs

Currently available for new projects

Let's Work Together

Technology, strategy and sustainability in one studio. Available for complex engagements across the EU.

Remote EU · Lisboa, Portugal

Schedule a Call Send an Email

CV Consultant ESG (EN)CV Programmer (EN)

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