I don't believe "ouvrage d'exécution" is a specific type of construction project; he's just saying he has experience with managing projects.

Inductively from the asker's explanation, rather than deductively from the 'French' label.

“Construction operations” means operations of any of the following descriptions:
1. The construction, alteration, repair, extension, demolition or dismantling of buildings
or structures;
2. The construction, alteration, repair, extension or demolition of any works forming, or
to form, part of the land, including walls, road-works, power lines,
telecommunication apparatus, aircraft runways, docks and harbours, railways, inland
waterways, pipelines, reservoirs, water mains, wells, sewers, industrial plant and
installations for purposes of land drainage;
3. The installation in any building or structure of systems of heating, lighting, airconditioning, soundproofing, ventilation, power supply, drainage, sanitation, water
supply, burglar or fire protection; The external cleaning of buildings (other than
cleaning of any part of a building in the course of normal maintenance) or the
internal cleaning of buildings and structures, in so far as carried out in the course of
their construction, alteration, extension, repair or restoration;
1. The installation in or on any building or structure of systems of
telecommunications;
4. The external cleaning of buildings (other than cleaning of any part of a building in the
course of normal maintenance) or the internal cleaning of buildings and structures,
in so far as carried out in the course of their construction, alteration, extension,
repair or restoration;
5. Operations which form an integral part of, or are preparatory to, or are for rendering
complete such operations as are described in paragraphs (a) to (d), including site
clearance, earth-moving, excavation, tunnelling and boring, laying of foundations,
erection of scaffolding, site restoration, landscaping [1] and the provision of
roadways and other access works;
6. Operations which form an integral part of, or are preparatory to, or are for rendering
complete, the drilling for or extraction of minerals, oil, natural gas or the exploration
for, or exploitation of, natural resources;
7. The haulage for hire of materials, machinery or plant for use, whether used or not, in
any of the construction operations referred to in paragraphs (a) to (f).

La maîtrise. Ensemble des agents de maîtrise, ce qui explique ma traduction par 'supervision' https://droit-finances.commentcamarche.com/faq/42365-agent-d...

There are five phases in project management (but different names are used for the phases by different people, and some -- less numerous -- theories say there are only four, if memory serves):

https://www.smartsheet.com/blog/demystifying-5-phases-projec...

In theory, what the developer is saying is that it specialises in stage 4 of project management, i.e. "Performance & Control" according to the website I've posted, to the exclusion of the other phases.

In theory.

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Note added at 3 hrs (2021-03-22 16:54:21 GMT)
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My ultimate source: https://www.pmi.org/

"Join PMI, the world’s leading project management organization with over 600,000 Global Members and over 300 Local Chapters Internationally."

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Note added at 3 hrs (2021-03-22 17:02:14 GMT)
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I just left out one or two small details, ahem:

1) exécution > performance, in a legal context: perform an agreement

2) See the ProZ glossary for confirmation of maîtrise d'ouvrage > project management

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Note added at 7 hrs (2021-03-22 21:18:36 GMT)
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the Performance & Control phase of CONSTRUCTION project management

But the construction bit will be obvious from the developer's overall profile.

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Note added at 1 day 10 hrs (2021-03-23 23:53:31 GMT)
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The link above doesn't work, maybe this one will:

https://www.smartsheet.com/blog/demystifying-5-phases-projec...

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Note added at 1 day 10 hrs (2021-03-24 00:21:15 GMT)
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So, depending on context:

As a headline:

"EXPERTISE IN PROJECT MANAGEMENT OF THE PERFORMANCE (AND CONTROL) PHASE OF CONSTRUCTION PROJECTS"

"AND CONTROL" can be omitted, according to taste.

Long but, I claim, right.

In the body of a text: "the Performance and Control phase of construction project management". (With or without the caps, again, according to taste.)

Depends on your "audience", of course, if he/she/they doesn't/don't understand "performance" in this context, well that's where Aughrim will be lost (it's an Irish thing, means when it's "done" or all over bar the shouting, over)!

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Note added at 1 day 14 hrs (2021-03-24 04:15:39 GMT)
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Whoops! Agrees can come and go! No hard feelings. One of the wisest expressions in French is that, "Il n'y que les cons qui ne changent pas d'avis". Respect.

There's a mission with a guarantee that assigned work is carried out with respect to planning, materials and working regulations. The mission includes guidance and directives of the work undertaken, with quality control and the financial administration in the workplace (building site or shipyard). It includes attendance to the master of assigned work until the receipt and the issue of stocks and supplies. There's also the verification or auditing of definitive business files, with records of the work carried out to completion. It encourages workers to gain a certificate of compliance and attendance throughout the year, with achievements such as completed projects of work.

(FR:
'Il existe également la possibilité de l'assistance en vue de l'abtention du certificat de conformité et l'assistance durant l'année de parfait achèvement (des oevrages et des projets des travaux réalisés). '

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Note added at 2 days 10 hrs (2021-03-24 23:45:37 GMT)
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l'oevre = the work
l'ouvrage = the piece of work, handiwork or the book or the publication

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Note added at 2 days 13 hrs (2021-03-25 03:19:46 GMT)
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FR:'le mise en oevre règlementaire'
EN: 'regulatory implementation or enforcement'
FR: 'assistance au maîtrise d'ouvrage'
EN: 'attendance or assistance to the project owner, project manager or contracting authority'
FR: 'l'ouvrage éxécuté'
EN: 'the work performed or carried out'

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Note added at 2 days 21 hrs (2021-03-25 11:06:21 GMT)
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It's about project or construction management. The work involves production, manual labour or craftsmanship. It's about tasks of work to be completed in sections, hence the reference to project work and administration. If we put something to work we use functioning and computational tools or equipment, while there are projects of work to be done bit by bit. Another side of production work is its administration, for which notebooks, registers and workbooks are recommended, where the work can be recorded along with staff attendance, materials and equipment used as well as resources. The costs involved in replacing materials used for the maintenance of a continuing supply of resources can also be noted. Project managers or owners are near administrators.

(FR: Il s'agit de la gestion ou la possession et la délivrance de la réalisation d'un projet. L'oevre est du travail de production ou de construction, comme les travaux manuels qui font de l'artisanat. C'est également sur les tâches et les travaux achevés peu à peu. Quelqu'un à l'oevre a du travail à faire. Quand on met quelque chose en oevre on utilise des outils de travail et les outils informatiques. Il y a donc les projets du travail qu'il y a à compléter peu à peu. L'ouvrage est aussi du travail et quand on se met à l'ouvrage on se met à travailler aussi pour faire la partie administrative d'un projet. Pour ça il y a des livres ou des cahiers d'ouvrage et on fait des registres ou on consigne des rapports sur le personnel qui arrive pour faire du travail, les dates et les jours avec des tâches ou des oeuvres réalisés. Dans l'enregistrement il est possible d'y metttre aussi des notes sur les individus qui prennent partie de la réalisation d'un projet, et des outils de travail avec n'imports quels des coûts à payer pour remplacer des matériaux utilisés.)