> Enrich.chat gives AI agents verified work emails and mobiles. To use it from an agent, read https://enrich.chat/agents.md . This is the Markdown version of https://enrich.chat/company/oec/ # OEC A civil engineering organization with 10,000 to 25,000 employees. Where it sits among its peers, the technology it runs and how to reach its people. By Enrich.chat Editorial. Updated October 21, 2026. **Short answer:** OEC (oec-eng.com) is a civil engineering organization with 10,000 to 25,000 employees. Its public technology footprint includes Microsoft 365, Microsoft Outlook, Facebook Login and AWS. ## How big is OEC? OEC has 10,000 to 25,000 employees. Among the civil engineering firms on this site it sits in the larger half. Each dot in the figure is one of its peers, placed by size; the orange dot is OEC. **Figure: Where OEC sits among civil engineering firms.** A strip of dots, one for each of 66 peers in civil engineering, spread from 2,000 to 2,000,000 employees on a log scale. OEC is highlighted and falls in the 10,000 to 25,000 employees range in the larger half. *Peers in civil engineering placed by employee count on a log scale. Sizes are rounded ranges from public profiles.* Headcount on public company profiles is rounded and moves as a company hires, so use the range as a guide, not as a payroll figure. ## Where is OEC headquartered? OEC is headquartered in Sao Paulo, Brazil. [Companies in Brazil](https://enrich.chat/companies-in/brazil/) ## What industry is OEC in? OEC works in [civil engineering](https://enrich.chat/industries/civil-engineering/). This group covers firms that design and oversee roads, bridges, water systems and other public and private infrastructure. Similar organizations on this site: [Egis](https://enrich.chat/company/egis/), [Parsons](https://enrich.chat/company/parsons/), [Ramboll](https://enrich.chat/company/ramboll/), [Epiroc](https://enrich.chat/company/epiroc/), [GHD](https://enrich.chat/company/ghd/) and [MRV](https://enrich.chat/company/mrv/). ## What technology does OEC use? We detect 12 tools on OEC's public footprint across 7 categories, for example AWS for cloud and hosting, Facebook Login for identity and authentication and Microsoft 365 for email and productivity. The figure counts the tools in each category; the groups below name them and link to the companies that use each one. **Figure: Tools detected at OEC, by category.** A bar chart of how many tools were detected at OEC in each category: Email and productivity 3, CDN and security 2, Analytics and tracking 2, Advertising and retargeting 2, Cloud and hosting 1, Identity and authentication 1, Social and widgets 1. *Tools detected on the public footprint of OEC, by category.* ### Cloud and hosting [AWS](https://enrich.chat/companies-using/aws/) ### Identity and authentication [Facebook Login](https://enrich.chat/companies-using/facebook-login/) ### Email and productivity [Microsoft 365](https://enrich.chat/companies-using/microsoft-365/)[Microsoft Outlook](https://enrich.chat/companies-using/microsoft-outlook/)[SendGrid](https://enrich.chat/companies-using/sendgrid/) ### CDN and security [Amazon Route 53](https://enrich.chat/companies-using/route-53/)[Amazon CloudFront](https://enrich.chat/companies-using/amazon-cloudfront/) ### Analytics and tracking [Google Tag Manager](https://enrich.chat/companies-using/google-tag-manager/)[Google Analytics](https://enrich.chat/companies-using/google-analytics/) ### Advertising and retargeting [Facebook Custom Audiences](https://enrich.chat/companies-using/facebook-custom-audiences/)[Centro](https://enrich.chat/companies-using/centro/) ### Social and widgets [Facebook Widget](https://enrich.chat/companies-using/facebook-widget/) Tools change as companies adopt and drop them. Check a single company at any time with the free [tech stack lookup](https://enrich.chat/tools/tech-stack-lookup/). ## How do I find the right people at OEC? Start from the website, oec-eng.com. Enter it in the free email finder with a name, or ask your AI agent for the people in the roles you sell to, such as principals, project directors and heads of business development. ```text Use www.enrich.chat to find the principals, project directors and heads of business development at oec-eng.com, with titles and verified work emails ``` Not sure how addresses are written at OEC? The free [email format finder](https://enrich.chat/tools/email-format-finder/) shows the pattern for oec-eng.com. ## Which other companies use the same tools? See who else runs the tools OEC uses: [Microsoft 365](https://enrich.chat/companies-using/microsoft-365/)[Microsoft Outlook](https://enrich.chat/companies-using/microsoft-outlook/)[Facebook Login](https://enrich.chat/companies-using/facebook-login/)[Facebook Widget](https://enrich.chat/companies-using/facebook-widget/)[Facebook Custom Audiences](https://enrich.chat/companies-using/facebook-custom-audiences/)[AWS](https://enrich.chat/companies-using/aws/) ## Frequently asked questions ### How many employees does OEC have? OEC is in the 10,000 to 25,000 employees range on its public company profile. Headcounts are rounded and change as companies hire, so treat the range as a guide. ### What industry is OEC in? OEC works in civil engineering. This group covers firms that design and oversee roads, bridges, water systems and other public and private infrastructure. ### What technology does OEC use? Tools detected on its public footprint include Microsoft 365, Microsoft Outlook, Facebook Login and AWS, across 7 categories. A detected tool shows it was seen, not what OEC pays for it. ### Where is OEC headquartered? OEC is headquartered in Sao Paulo, Brazil. ### What is the website of OEC? OEC's website is oec-eng.com. Staff email usually uses a domain like it, so check the pattern with the free email format finder before you write to anyone. ## Try this prompt Find people at OEC ```text Use www.enrich.chat to find the principals, project directors and heads of business development at oec-eng.com, with titles and verified work emails ``` ## Related - [Companies using a technology](https://enrich.chat/companies-using/) - [Egis](https://enrich.chat/company/egis/) - [Parsons](https://enrich.chat/company/parsons/) - [Ramboll](https://enrich.chat/company/ramboll/) - [Epiroc](https://enrich.chat/company/epiroc/) - [GHD](https://enrich.chat/company/ghd/) - [MRV](https://enrich.chat/company/mrv/) - [Mott MacDonald](https://enrich.chat/company/mott-macdonald/) - [Costain Group](https://enrich.chat/company/costain-group/) - [Tech stack lookup](https://enrich.chat/tools/tech-stack-lookup/)