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      Cirium

      Part of RELX

      Engaged Employer

      Cirium reviews

      3.1

      45% would recommend to a friend

      (106 total reviews)

      Jeremy Bowen

      83% approve of CEO

      50% positive business outlook

      Ratings by demographic groups

      Cirium has an employee rating of 3.1 out of 5 stars, based on 106 company reviews on Glassdoor which indicates that most employees have a good working experience there. The Cirium employee rating is in line with the average (within 1 standard deviation) for employers within the Aerospace & Defense industry (3.6 stars).

      Reviews by job title

      106 reviews
      2.0
      Jun 18, 2026

      Toxic culture and poor leadership hinder growth opportunities

      Senior software engineer
      Recommend
      CEO approval
      Business Outlook

      Pros

      2 hrs per week for Learning(if you get capacity) Some really great employees benefits Potential to be better as product as well a culture.

      Cons

      List is unlimited and is getting bigger since a lot has change (bad change) from last year in company's culture. At high level, the current state of technical leadership is the result of bad hiring and decisions.(Its quite visible how series of bad decision in hiring the position of leaders and promoting has impacted not only all engineering teams but some of the most foundational team(which is now gone entirely) and as a result entire Engineering is suffering). The decision making is in silos, and no VP or Directors now knows or understands or even wants to understand how deeply we are in the puddles. HR is either unaware or intentionally has decided to keep the eyes shut on the state of this. The internal feedback system once used for honest feedback for improvement is now faked to positive to avoid the retaliation from the leaders(as no one wants to lose the job, we have Mortagage to pay). Leadership believes in saving their reputation by covering up themselves from bad decisions which resulted in many great people leaving. Company now do not has retention as priority, its clearly has communicated and hinted over and over again, that everyone is replaceable, and we should do what has been asked for, which has created a hostile environment. These issues have been here for almost a year and not even a single change has been made. We have been told over all hands to speak up, do the right thing but if one speaks up we'll only be with the option to retaliate or quit. Career opportunities is now not something that will be given to you if you deserve it or through a transparent process, but if you are from the same other company everyone is coming from, or you have certain influence over the Leadership.

      avatar
      Cirium Response
      1d
      Thank you for taking the time to share your feedback and for your many years with Cirium. We're sorry to hear that your experience over the past year has not reflected the culture and environment we strive to create. We appreciate you taking the time to provide such detailed feedback. At the same time, we're pleased to hear that you've found value in our employee benefits and dedicated learning time. Thank you for sharing your concerns regarding culture, leadership and career development. Feedback like this is important, and we take it seriously. We are committed to creating an environment where colleagues feel supported, respected and able to share their views openly. Trust, transparency, collaboration and opportunities for growth are fundamental to a positive employee experience. As our business continues to evolve, we remain focused on strengthening these areas and improving the experience of our colleagues across the organisation. Thank you again for sharing your perspective. We value open dialogue and encourage colleagues to continue providing feedback through the channels available to them. Listening to and learning from our people is an important part of how we move forward as a business.
      4.0
      Jun 17, 2026

      Great culture and flexibility, but limited travel opportunities

      Pricing strategy manager
      Recommend
      CEO approval
      Business Outlook

      Pros

      Great company culture and flexibility

      Cons

      not many opportunities to travel and meeting team members and colleagues located remotely, unless you are a senior leader

      avatar
      Cirium Response
      1d
      Thank you for taking the time to share your feedback and for your contribution to Cirium. We're pleased to hear that you had a positive experience with our culture and the flexibility we offer colleagues. Creating an environment where people feel trusted, supported and able to balance their professional and personal commitments is important to us. We also appreciate your feedback regarding opportunities to connect with colleagues across locations. As a global business with teams working across different offices and regions, we recognise the value of in-person collaboration and relationship building. The business travel opportunities are guided by company travel policies and business needs to ensure travel is purposeful, consistent and aligned to organisational priorities. We continue to look for ways to bring colleagues together, both virtually and in person, to strengthen connections and collaboration across the business. Thank you again for sharing your experience. We value feedback from current and former colleagues and use it to help shape how we continue to evolve and improve as a workplace.
      2.0
      Apr 27, 2026

      When the Race for Revenue Outran the Company Values.

      Anonymous employee
      Recommend
      CEO approval
      Business Outlook

      Pros

      There was a time when the office actually had a heartbeat. We weren’t just "resources" or "headcount"—we were a group of people who actually knew each other.Slowly, the organic lunch chats were replaced by back-to-back sprints. The "family" vibe got diluted by a wave of new hires who never got a proper hello, let alone a chance to bond. Now, the office feels like a crowded terminal—lots of people moving, but nobody actually talking.

      Cons

      The vibe has shifted from "building together" to "surviving the system." Here is the reality of the slow downfall: ​The "New Blood" Obsession: Leadership is obsessed with hiring "rockstars" from the outside to hit growth targets, while the internal veterans are passed over. Instead of being allowed to grow into new roles, the old guard is stuck in the same position, expected to train their new (and often higher-paid) bosses. ​The Load-Bearing Engineers: On paper, the new hires are the "growth," but in reality, the entire company is resting on the shoulders of a few "OG" engineers. They are the only ones who know where the bodies are buried in the code, yet they get zero recognition—just more work. Dictatorship over Dialogue: The Leadership Team (LT) has stopped asking "What do you think?" and started saying "This is the rule." They’ve retreated into boardrooms, handing down mandates that don’t work in the real world, and they’ve stopped listening to the people actually doing the work. ​The Replacement Theory: Retention is no longer a goal; it’s a math problem. Leadership has decided that everyone is replaceable. They don’t care if a 5-year veteran leaves because they’ve convinced themselves a fresh grad and a documented process can fill the gap. They’re betting that "hope" will keep the remaining team from getting upset, but they’re actually just breeding resentment.

      avatar
      Cirium Response
      1mo
      Thank you for taking the time to share a detailed reflection on your experience. We appreciate both the positives you’ve highlighted and your candid feedback on where things have changed. We recognise the concerns you’ve raised around a culture shift. As Cirium grows, maintaining strong team cohesion and connection is a priority. We’re investing in this through structured onboarding, regular hub events and local Culture Club activities to help teams build relationships and stay connected. Your feedback on hiring, progression and recognition is important. We are focused on ensuring internal talent is developed and recognised, with clearer and more consistent pathways for progression so that experience and contribution are valued. We also acknowledge the concerns around workload, reliance on key individuals and recognition. Creating sustainable ways of working and distributing responsibility more effectively remains a key focus. We are strengthening expectations for leaders to stay close to their teams, listen to feedback and ensure decisions reflect the realities of day‑to‑day work. Thank you again for sharing your perspective.
      Viewing 4 - 6 of 106 Reviews
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      ReviewsCirium reviews

      Glassdoor has 107 Cirium reviews submitted anonymously by Cirium employees. Read employee reviews and ratings on Glassdoor to decide if Cirium is right for you.