Cirium reviews

3.1

45% would recommend to a friend

(106 total reviews)

Jeremy Bowen

83% approve of CEO

50% positive business outlook

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
Aug 18, 2023
Recommend
CEO approval
Business Outlook

Pros

CEO, global head of sales are really inspiring and motivating. They are incredibly approachable and keen to always have a conversation. Company is on a direction that can really work. Just need to continue investing in the right people and ensure culture improves.

Cons

Management style in the sales team can come across toxic. A few managers are great but some are very “old school” Generally people get talked at. Check ins are very business oriented. We are all adults but get spoken to like children. A lot of passive aggressive behaviours lead to stress and burnt out. If a mistake happens it is blown out of proportion. Foster a safe environment. Make it happen. Do not just say it.

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Cirium Response
2y
Thank you for taking the time to share your experience. We’re glad that you’ve recognised our senior leaders as inspiring and motivating and feel that the company is heading in the right direction. We know that it is impossible to achieve this without great employees who feel psychologically safe and can thrive. We invest in training programmes for our Sales Teams and managers and people leaders, including core manager skills, diversity and inclusion and psychological safety. However, it is clear that you witnessed the opposite experience we want to cultivate at Cirium, and we are grateful for the opportunity to rectify this. We will share your advice with the Cirium Leadership Team and agree on the next steps to ensure the culture in our teams reflects Cirium’s Values. If you are comfortable, we would be grateful if you could reach out to a member of our leadership team to discuss your experience in more detail.
5.0
Jan 7, 2020
Recommend
CEO approval
Business Outlook

Pros

- The tech team is lead by very capable architects and managers; - Interesting domain and projects; - Learning is encouraged and _actually_ supported by the managers; - Relaxed working environment; - Spacious office; - Impressive benefits;

Cons

- The company is owned by a very large organisation, which in itself is a good thing but also brings in a ton of bureaucracy to deal with; - Sometimes seemingly decided things take forever to start moving forward; - Some sales persons were difficult to work with;

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.

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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 46 - 48 of 106 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.