Melissa Ribaira
Melissa Ribaira

Chief Operating Officer | Operating & People Executive

Open to offers · Member since 5 Oct 2026
Location
Lisbon, Portugal
Desired salary
Unspecified
Work preference
Remote Only / Full Time, Contract, Freelance
Experience level
Lead

About

Professional summary

I am an operating and people executive with more than 18 years of experience across FMCG, banking, medtech, biotech, Web3, fintech, gaming, healthcare, and HR technology. I work in regulated, high-stakes, and ambiguous environments where companies need structure without losing momentum.

I build the operating infrastructure that enables organisations to scale intentionally. My work spans operating models, organisational design, governance, decision rights, execution cadence, distributed-team practices, and leadership accountability.

I co-own financial strategy alongside organisational design, building and stress-testing financial models, P&Ls, cash-flow plans, cap tables, fundraising scenarios, and headcount strategies. I support founders before investor conversations by identifying structural risks and sharpening the operating and fundraising narrative.

I design people systems that connect hiring, performance, compensation, equity, succession, and accountability to business outcomes. I have scaled teams rapidly, led restructurings, and built practical HR and operations foundations from zero.

I also work across legal, compliance, due diligence, IP audits, and governance. I use AI-first and agentic workflows for research, verification, drafting, and analysis while retaining ownership of executive judgement and strategic decisions.

I currently lead and advise early-stage ventures as a founder, fractional COO, and operating advisor. I am particularly effective with founder-led businesses preparing for growth, fundraising, licensing, partnerships, or operational transformation.

Skills

29 capabilities

Tech stack & tools

Working toolkit

Collaboration

Marketing and Sales Tools

Experience

Career history

Founder & CEO Tray-it

I am building an on-device AI layer between capture and action.

I built an AI-agent pipeline for weekly investor sourcing, reducing approximately four hours of manual work to 30 minutes of review and sending.

Fractional Chief Operating Officer Matchez Ltd

I built the operating infrastructure from zero for a candidate-first talent marketplace, including contributor governance, asynchronous working norms, accountability matrices, and an execution cadence for a distributed team scaling from 3 to 20 people.

I designed milestone-based compensation linked to ARR thresholds and own a 36-month financial model covering P&L, cash flow, cap table, COGS, OPEX, headcount strategy, seed scenarios, and EBITDA-based valuation. I also co-own investor positioning and stress-test assumptions before fundraising conversations.

Fractional Chief Operating Officer PressLabs Inc.

Supported a Web3 infrastructure venture involving Press Blockchain, Proof-of-Press consensus, and the PressChain publishing platform.

Clarified strategic direction and decision-making through governance, compliance, and execution structures.

Fractional Head of People & Operations Axiosys GmbH

Restructured a 35+ person indie game studio operating in significant operational chaos. I introduced a lean accountability matrix, centralised people data, and secured sprint closures under tight runway constraints.

I reframed the company narrative from passion-led to economics-led and built the financial and operating model needed for licensing and partnership discussions.

Head of People & Operations Obinex

Led people and operations for a regulated digital-asset investment platform offering blockchain-based financial products. I scaled the team from 25 to 75 in under four months while rebuilding core people and operations systems.

I subsequently led a 50% reduction after determining with the CEO that additional hiring would not resolve product and roadmap gaps. I diagnosed structural and leadership dysfunction and rebuilt the operating model around accountability, execution, and product-aligned team sizing.

Operations Manager & Non-voting Board Secretary AllTokenFootball

Built the legal and financial foundation for a fan engagement platform, including incorporation, banking, accounting, and investor relations.

Acted as a CEO proxy across product and partnerships, coordinated workstreams, mitigated token-generation regulatory risk, and produced investor reporting and strategic materials supporting the Seed round, a Tezos Foundation grant, and sports-league partnerships.

Head of Back Office & HR Partner Stalicla SA

Maintained operational and HR continuity at a clinical-stage biotech company during leadership instability. I served as a coordination anchor across governance, people systems, and employment disputes to reduce legal exposure.

I also coached executive support teams to maintain precise execution under high-pressure and conflicting demands.

Executive Assistant to the CEO & Project Coordinator m3 SANITRADE (m3 Group)

Coordinated workforce planning, KPI reporting, and HR liaison across the CEO and management team for a major Swiss healthcare operator during the COVID-19 response.

I deployed SOPs, shift-managed more than 15 staff at a high-volume testing centre handling up to 1,800 tests daily, and liaised with Swiss Health Authorities and notified bodies to support recertification and distribution of more than 18 million medical devices.

Executive Assistant to the CEO & Office Manager Stalicla SA

Supported the CEO and Board across investor relations, Series A preparation, conference strategy, SOP development, and HR foundations.

Established foundational operations and people functions that supported the company's Series A close.

Digital Marketing Coordinator Hitachi Medical Systems

Managed a €350K budget and designed and launched a physician eLearning platform.

Onboarded more than 1,800 users within five months through partnerships with learned societies.

Senior PA, promoted Associate Citibank Switzerland A.G.

Supported the Global Market Manager across four regions and was promoted to Associate within 12 months.

Covered Business Manager responsibilities including KYC reviews, EMEA CEO sales reporting, and appraisals for a 15-banker team.

Finance & Accounting Business Assistant Procter & Gamble International Operations

Supported the Western Europe Baby Care Finance Director and three group managers.

Managed budget tracking that delivered consistent 8% year-on-year savings, and designed coaching surveys while screening and onboarding peer candidates.

Founder & Practitioner U-GR8

Provide advisory services to founders and acquirers, including pre-acquisition IP audits, operations audits, SAFE and fundraising structuring, and executive screening.

Apply Neuroplastic Mental Acceleration and behavioural frameworks to leadership performance, hiring, culture design, and management capability-building.

Education

Learning history

Council for Human Development

NMA Practitioner, Trainer's Training Programme, Neuroplastic Mental Acceleration

Practitioner and trainer development in Neuroplastic Mental Acceleration.

AssessFirst

Behavioural & Cognitive Assessment, Behavioural and Cognitive Assessment

Training in psychometric interpretation and behavioural assessment frameworks.

This professional hasn’t added portfolio projects yet.

This professional hasn’t listed any services yet.

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