Flexcity

Portfolio Manager FR F/H/X

Join Flexcity in Pantin as a Portfolio Manager to optimize energy flexibility assets and manage client operations. This role offers a dynamic environment with opportunities to influence European energy markets and work within a global leader in ecological transformation.
Flexcity
Flexcity
Pantin, France On-site Full time UTC+02:00

Flexcity

Company Overview

Flexcity, a subsidiary of Veolia

Brussels, Belgium

2012

Approximately 100 employees (source: linkedin.com). Revenue figures are not specified, but Veolia reported consolidated sales of €45.3 billion in 2023 (source: veolia.com).

What They Do

Flexcity specializes in aggregating electrical flexibility, optimizing demand response and short-term electricity markets through smart grid solutions. This includes the use of batteries, renewable energy sources such as distributed generation and wind power, as well as industrial processes like electrolyzers and electric boilers (power-to-heat). Flexcity does not focus directly on hydrogen or large-scale solar/wind energy development (source: flexcity.energy). Their main products and services include a proprietary platform for connecting, operating, and optimizing assets in markets such as intraday, day-ahead, and secondary reserve services (source: flexcity.energy). Target markets include balancing services and ancillary services in Europe, with clients in various sectors such as water treatment, waste recovery, and battery energy storage systems (BESS) (source: flexcity.energy). Flexcity has distinguished itself as a market leader since 2012, managing over 3 GW of flexible power, equivalent to that of a nuclear power plant, and was the first to innovate in aFRR aggregation in Belgium (source: flexcity.energy).

Projects and Background

Flexcity has completed several notable projects, including its integration into TenneT's aFRR market in the Netherlands in 2023 via Equigy's Crowd Balancing platform, which aggregates batteries and industrial processes for grid balancing (source: equigy.com). In France, the valorization of hundreds of Veolia Water's storage/inertia sites has been implemented over several years, along with the use of Orange's backup batteries since 2017 for demand response (source: flexcity.energy). In Belgium, projects such as the participation of the Aquiris wastewater treatment plant and the Beneo Orafti food site in aFRR have been completed (source: flexcity.energy). Ongoing projects include a BESS optimization in the Netherlands scheduled for January 2025 and the integration of the secondary reserve from Veolia's Lapouyade waste site in France (source: flexcity.energy).

Recent Developments

Over the past two years, Flexcity has announced several partnerships, including a collaboration with enspired for BESS optimization in the Dutch and Belgian markets, with initial contracts secured (source: flexcity.energy). The integration of the secondary reserve from the Lapouyade site in France is also planned for January 2025, marking a first for a waste storage site (source: veolia.com). In 2023, Flexcity successfully prequalified for TenneT's aFRR market in record time, demonstrating its agility and efficiency (source: equigy.com). No major acquisitions or external funding have been reported, with growth primarily driven by integration within Veolia since 2019 (source: flexcity.energy).

Working at Flexcity

Flexcity offers positions in product management, R&D, portfolio management, IT/data engineering, sales, and operations, with strong inter-team collaboration. Roles include positions such as Product Manager - Energy Flexibility Markets, focused on developing the platform for asset valorization (source: welcometothejungle.com). Recruitment is active at the Brussels headquarters (Saint-Gilles) for technical and product roles, with no specified remote work options (source: linkedin.com). The company culture emphasizes the agility of a startup with the support of Veolia, innovation at the core of operations, and transparency in processes (source: flexcity.energy). While specific benefits are not detailed, roles highlight impactful work in the energy transition, with potential benefits related to Veolia's ecological transformation initiatives (source: welcometothejungle.com).


Last updated on Feb 23, 2026 | Report an issue

At Flexcity, we help the European power system become smarter, more flexible, and more sustainable by connecting industrial assets (batteries, e-boilers, heat pumps, data centers...) to energy markets.

A subsidiary of Veolia Group, we combine the agility of a scale-up with the stability of a global leader in ecological transformation.

Today, we are strengthening our operations team in France and are looking for a Portfolio Manager F/H/X to support the performance and growth of our flexibility portfolio in our Paris Office in France.

Job Description

As a Portfolio Manager, you play a key role in the operational success of Flexcity's flexibility services in France.

You are responsible for onboarding assets, optimizing market participation, managing client operations, and ensuring reliable service delivery in a complex and evolving energy environment.

Reporting to the Country Manager, your role is structured around three main areas:

  • Portfolio Operations & Market Participation (40%)
    • Onboard new clients and assets into Flexcity's flexibility services.
    • Manage participation in TSO tenders, including capacity assessment and bidding/pricing strategies.
    • Optimize asset performance across ancillary service markets.
  • Client & Risk Management (35%)
    • Act as the main operational and technical point of contact for clients.
    • Monitor service delivery and proactively identify and mitigate operational risks.
    • Ensure high service quality and long-term client satisfaction.
  • Market Intelligence & Internal Coordination (25%)
    • Track regulatory changes and market evolutions related to flexibility and ancillary services.
    • Represent Flexcity in workshops and exchanges with TSOs and market stakeholders.
    • Coordinate closely with Sales, Product, and other internal teams to improve processes and solutions.

Qualifications

You have 5+ years of experience in energy markets, operations, engineering, data, or other technical/regulated environments.

You have a strong analytical mindset and a solid interest in power systems and market mechanisms. You enjoy working at the intersection of clients, markets, and technical systems in fast-moving environments.

What You Will Bring

  • Technical Knowledge & Skills
    • Strong analytical and problem-solving skills.
    • Good understanding of energy markets, power systems, or regulated environments.
    • Ability to work with data and modeling tools (e.g. Excel, SQL, Python, Grafana or similar).
    • Interest in market mechanisms and energy regulation; knowledge of ancillary services is a plus.
    • Fluent in French and English.
  • Personal Qualities
    • Delivery-oriented, pragmatic, and reliable.
    • Strong team player with a "can-do" mindset.
    • Proactive, curious, and comfortable in complex environments.
    • Able to communicate clearly with both technical and non-technical stakeholders.

Additional Information

Interview Process

  • HR / Talent Acquisition interview (video call - 45 min) - discussion of your background, motivations, and context.
  • Manager interview (60 min) - deep dive on the role, operations, and market challenges.
  • Case study (take-home, 1 week to do it)
  • In-person debrief (45 min) - with the Country Manager and a team member (culture & alignment).

As an inclusive company, Veolia is committed to diversity and gives equal consideration to all applications, without discrimination.

Apply now

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About the role

June 24, 2026

June 24, 2026

Full time

On-site

Company

Energy Storage, Smart Grid

Flexcity

flexcity.energy

  •  Pantin, France

5+ years

UTC+02:00