Flagstone Reviews

3.9

64% would recommend to a friend

(115 total reviews)

Arman Tahmassebi

66% approve of CEO

69% positive business outlook

Flagstone has an employee rating of 3.9 out of 5 stars, based on 115 company reviews on Glassdoor which indicates that most employees have a good working experience there. The Flagstone employee rating is in line with the average (within 1 standard deviation) for employers within the Finance industry (3.7 stars).

Reviews by job title

115 reviews
2.0
13 Feb 2026
Recommend
CEO approval
Business outlook

Pros

- The product has genuine market strength - There are highly capable, hardworking people across teams - Only need to be in the office once a week

Cons

Over the past 18 months, trust in leadership and confidence in internal processes have dropped significantly, and the shift’s been noticeable across the business. Performance reviews, promotions and pay are tied to a calibration process employees can’t see into and aren’t given clarity on. Decisions are made privately, criteria are vague, and outcomes often aren’t properly explained. Ratings don’t feel performance-based; they feel decided. Employees don’t get meaningful input into their own reviews, so outcomes depend heavily on how well a manager knows your work. If you’ve had a manager change during the year, that alone can affect your rating simply because they don’t have enough context. Promotion’s tied to this same system, and it shows. Advancement doesn’t feel consistently merit-based. Pay transparency’s been talked about internally for over two years, yet salary bandings still haven’t been published, and discussing pay’s discouraged. That combination makes it hard to trust that decisions are fair. Favouritism is a widely recognised issue internally. Several recent hires into influential roles have direct links to leadership from previous companies, while strong internal candidates struggle to even get interviews. The pattern’s obvious and widely discussed, and it seriously undermines trust in how hiring and progression decisions are made. It’s hard to ignore once you’ve seen it happen more than once. Relationships clearly influence outcomes. Employees who regularly socialise with senior staff outside of work tend to progress faster than those who focus purely on performance. The environment rewards visibility and social alignment more than results, which creates a clear bias toward extroverted personalities. This isn’t something people whisper about, it’s widely recognised across teams. Psychological safety is a real concern. Staff are encouraged to be open and honest, yet speaking candidly can later count against you, especially when “values” are assessed. The result’s predictable: people stop speaking up. Turnover and tenure are now a structural risk. Over 60% of employees have been at the company less than two years, which has created knowledge gaps and increased pressure on those who remain. A large amount of experience has left (or been forced out), and the impact’s visible day to day. Feedback mostly flows one way. Direction comes from the top, but honest upward feedback isn’t consistently welcomed or acted on. That limits improvement and discourages initiative. Workloads are heavy, overtime’s common in some teams, and recognition or pay adjustment doesn’t always follow.

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Flagstone Response
3mo
Thank you for taking the time to write this. It's detailed and direct, and it deserves a genuine response rather than a formulaic one. We are a values-led organisation, which means we hold ourselves accountable when our actions don't match our intentions. Some of what you've described reflects a period of significant growth and transition — we grew our headcount by 30% in 2025, and we're honest enough to acknowledge that scale of growth brings real organisational challenge. Processes, communication, and culture all come under pressure when a business expands at that pace, and we put every effort into making every part of that journey as smooth as it could be. On performance and calibration: our new performance framework was built directly from feedback from across the business. Our intent was clear — make the process more inclusive, reduce unconscious bias, and create something more transparent for everyone going through it. In practice that means clearer criteria, more meaningful input, and a calibration process that is objective and less dependent on individual manager context. It represents a genuine step forward from where we were, and we'll keep evolving it. We're committed to merit-based advancement and we take seriously the perception — and reality — that relationships can influence outcomes. Perception shapes culture as much as intent does, and we're looking closely at how we assess internal candidates and communicate decisions. We have invested a significant amount into diversity and inclusivity over the past 24 months, and we continue to do so – and likewise, we are continuing to evolve our internal mobility process. On pay transparency, our Engineering salary bandings are going live now - a first step, not a final one. By the end of 2026, all of our salary bands will be published which is an important step for us – we want to be ahead of the curve, but most importantly, we want to build high levels of trust – a fundamental part of our culture. If people feel that speaking honestly is later used against them, that is a direct failure of our values, and I’m disappointed to hear that we have failed you here and not created the necessary psychological safety. We are driving a high-performance culture and feedback is openly encouraged, both ways, across the business. Your feedback helps us identify where the gap exists. We will continue to invest here. We recognise that rapid scaling can create the feeling of instability, and we're mindful of the knowledge and continuity pressures that come with bringing a large number of new people into the business in a short period of time. That's something we're actively managing, and we have been fortunate, through targeted investment, for our turnover to remain stable, even throughout the period of significant headcount growth. I’m sorry that you had a poor experience with us, and I’m especially sorry given we pride ourselves on our culture. We take this feedback as a challenge to close the gap between our values and our practice — and we welcome direct conversations with anyone who wants to engage constructively.
1.0
19 June 2025

A toxic workplace

Recommend
CEO approval
Business outlook

Pros

Some nice people Cool office

Cons

Bullying and unsustainable pressure in lots of teams Unrealistic targets No career progression, especially if you are POC

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Flagstone Response
1y
We're sorry to hear you're not having a positive experience with us. We take allegations of bullying seriously, so we'd urge you to come and speak to someone in the People team confidentially so that we can look into this further and rectify any issues.
1.0
29 Mar 2019
Recommend
CEO approval
Business outlook

Pros

There are some ambitious, smart people here. An interesting product with high-growth potential. Office location is great.

Cons

Salaries far below market rate. Long hours with no recognition or reward for it. Don't even think about bringing up a career development planning with managers - they are not interested and almost offended by it. Autocratic management style with a managing partner who interrupts, talks over people and is very condescending. There are no channels for giving feedback and there is complete lack of transparency from senior leaders. So this toxic culture will continue at speed. The old school IB culture is strong here, along with all the politics and favoritism that go with it. If you want a rewarding and innovative startup environment where ideas and contribution are valued- avoid Flagstone at all cost.

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Flagstone Response
7y
Thanks for taking the time to review us – we welcome your feedback, good or bad. We are glad to hear you see the potential in our product – we think it’s fantastic! I’m sorry to hear you feel we are a long way off getting it “right” – we are still at the very early stages of our growth, and it’s right for us to acknowledge that there are, and will be, some growing pains along the way. But we aim high and I can say with certainty that we will always try to do our best by you. Given the current size of the company, we are working on establishing a People function – putting both the wellbeing of and the investment in our employees at the forefront of all we do now. We are always open to feedback, and I would welcome the opportunity to hear your thoughts on how we can improve.
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Glassdoor has 120 Flagstone reviews submitted anonymously by Flagstone employees. Read employee reviews and ratings on Glassdoor to decide if Flagstone is right for you.