Working at Tessian |

Tessian Overview

London, England
51 to 200 employees
Company - Private
Computer Hardware & Software
£5 to £10 million (GBP) per year
Tessian protects every business’s mission by securing the human layer. Using machine learning technology, Tessian automatically predicts and eliminates advanced threats on email caused by human error - like data exfiltration, accidental data loss, business email ... Read more

Mission: To protect every business’s mission by securing the human layer and empowering people to do their best work, without security getting in their way.

We are looking to work with the brightest minds to help us accomplish our goal and help us defend ... Read more

Company Updates

  • company-updates.categories.culture

    Seriously Tech, It’s Time to Ditch the Zero-Sum Game

  • company-updates.categories.culture

    In the age of coronavirus, Tessians couldn’t switch off with no-where to go and the spectre of their inboxes piling up and up. We knew we needed to stop saying things, and needed to do something big, fast... So we shut down the company. (For a day.) Read about how we've taken being #humanfirst to the next level

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Tessian – Why Work With Us?

Grit and Perseverance

At Tessian, we believe in building teams of high performing, brilliant individuals that make work a great and enjoyable place to be! We empower our employees to achieve and develop, giving them the responsibilities, scope and opportunities  that allow them to step up as soon as they're ready to progress. In a fast-growing company where everyone has substantial and visible impact, career advancement is limitless.

We strive to be bold and courageous, and we encourage one another to achieve, bringing passion and dedication to our work that is amplified by the support of our peers and management within Tessian.

Does the idea of working with dynamic, smart colleagues and doing your life's best work excite you? Then you're a great fit for Tessian and we'd love to hear from you!

You can see all our open roles here.

Craft at Speed
Craft At Speed

The Tessian Mission: To protect every business’s mission by securing the human layer and empowering people to do their best work, without security getting in their way.

We're building software that works for and with human beings they way they are, not how security policies want them to be. Humankind is full of incredible diversity - of characteristic, of thought, of behaviour - and we need security to work for the people, not around the people. Our platform works with the uniqueness of each person, and tailors protection to their needs. #HumanFirst in everything we do, from our culture, to our product, we're building the business of the future - the business of you. Join us.

Positive Mindset, Solution Oriented
Human First

Our Values

Our values are the principles that guide our day to day decision making. They aren’t aspirational words hanging on a wall that no-one understands. Instead, we spoke to our people and created values which are a true reflection of Tessian today.  They’re actionable, intuitive and central to everything we do, from our recruitment process through to performance and development. 

Our values are:

  1. Human first.
  2. Customer centricity.
  3. Positive Mindset. Solution Orientated.
  4. Grit & perseverance.
  5. We do the right thing.
  6. Craft at speed.
We Do The Right Thing

We’ve written this Values guide for 2 reasons.

  1. For those considering joining us on the Tessian journey.  We want to provide you with a sneak peak into the personality of Tessian and what it’s like to work here. 
  2. For those already on board.  We want to remind ourselves why we joined, and how we work together as a team.

In essence, this guide is  a ‘how to live’ our values. We hope it helps you understand what living the Tessian values means, what a difference they make in our day-to-day actions, and how they influence the decisions we make.

Our values shape everything we do. They guide our hiring decisions, onboarding itinerary, performance reviews, development conversations, and how we reward, recognize and promote our people. Our values underpin our culture. 

Human first.

We approach everything with empathy and we look out for each other alongside our own wellbeing. Respect, kindness and inclusion are at the core of our company because our people are what make us Tessian. 

What does this value look like in action?

  • We lead with empathy. This starts with knowing that we’re all in this together and we are working towards a common mission -- securing the human layer. When we’re making decisions, we look beyond your own interests or that of our team, to understand how the decision will impact everyone, at Tessian and beyond. 
  • We care deeply about those we work with. We let people know they’re valued team members, recognize when they’ve done great things and are curious about what’s important to them.
  • When we’re creating a new policy or process, we put the human element at the center of the design. It’s easy to gravitate to setting up policies and processes for efficiency or compliance, but this can lead to an unpleasant user experience. Instead, we think through how this new policy or process will impact others day-to-day, what their experience will be and how we can make sure the design is not only efficient, but feel good for the people it was intended to support inclusive.
  • Building relationships and making everyone feel included at Tessian is a priority for us. Everyday we take the time to connect with the people around us and listen to them deeply.  We ask questions like ‘What’s top of mind for you right now?’ and ‘How can I help you with your priorities?’ because we know this is the key to building connection and trust. We believe if we work together as a team, we are capable of so much more. 

Customer centricity. 

We fixate on our customers’ success. They’re the lifeblood of our business and guide our daily decision-making. Whether we're launching a feature, or pursuing a partnership, we always ask "How does this help our current and future customers?" 

What does this value look like in action?

  • We proactively seek feedback from customers, and listen to their problems and concerns. These conversations lead to valuable insights into our customers’ business and personal goals. The more we understand what’s motivating our customers, the better we’ll be able to partner with them to reach their desired outcomes.
  • When we get customer feedback, we don't let it sit around gathering dust. We put it to good use. We analyze it for trends, look for common problems, and, most importantly, share our findings with others at Tessians. This helps avoid data silos that prevent other teams from accessing important information. 
  • We propose deals that provide real value and make the biggest impact for potential customers, in both the short and long term, rather than deals which will help us make our number that quarter.  We see closing deals as the first step to building deep, long-lasting relationships with our customers. True customer centricity involves turning our customers into evangelists who believe in, advocate for, and keep coming back to Tessian.
  • When we’re building new product features, we think about how it could help our current and future customers, and not just about how exciting the project it is to work on.

Positive mindset. Solution oriented.

We lead with a curious, positive mindset, and go above and beyond to find solutions when problems arise. When our solutions fail, they fail fast -- we embrace the failure and keep learning, iterating, and improving.

What does this value look like in action?

  • Before raising an issue with a colleague, we take ownership of the situation and prepare a pre-read with a summary of the problem and a proposed solution (or solutions). Better yet - we add evaluations and a recommendation.
  • In the face of a difficult situation, like a technical issue with a customer, we take responsibility and consider how the issue could be an opportunity to go above and beyond to solve the problem. This helps us build even stronger relationships with the customer. 
  • If someone makes a mistake which affects the overall performance of the team, we don't dwell on it. Instead we do a retrospective and provide constructive feedback, and then focus on improving the process to help prevent something similar occurring again.
  • Because we are tackling unsolved problems, our engineers take on big and ambitious projects knowing that a handful of them will not see the light of day. We embrace this failure and accept that it’s necessary for us to learn and to achieve our vision. 

Grit and perseverance.

We have sustained passion for achieving long-term goals. We see setbacks as opportunities to adapt and grow. We’re committed to building resilience and have the motivation to tackle big challenges that others might give up on.

What does this value look like in action?

  • We don’t give up when we face setbacks in our work.  An Account Executive might hear a hundred  ‘no’s until she gets a single ‘yes’.  A talent manager might interview a hundred candidates before he finds the right culture fit. 
  • We embrace setbacks and change as opportunities for learning and development because we strongly believe in a growth mindset.  We get things wrong all the time at Tessian but what’s important is how we pick ourselves up and move forward.  We see challenges as opportunities to adapt, grow and emerge stronger than before.
  • Grit and perseverance isn’t about working long hours but being passionate about what we do. When we need to solve a problem, we don’t give up but we dig deep and keep coming back to it.
  • When hiring we want to know how candidates respond to failure, if they are flexible in dealing with unexpected obstacles, and if they sustain a habit of continuous self-improvement.

We do the right thing. 

We’re always honest and guided by integrity in every decision we make; with one another, with our customers, with everyone. We do what we believe is right, even when it means making difficult decisions.

What does this value look like in action?

  • We value honesty. With our customers, this means we’re transparent about technical issues, even if the problem is now fixed and they wouldn’t have otherwise been aware of it.
  • We embrace difficult conversations, whether they’re related to performance, day-to-day feedback with others, or a project we’re cross-functionally working on. We do this by having open and transparent conversations with each other.  We err on the side of speaking up when we see problems, and giving honest feedback rather than being concerned about whether we’re liked in the short term.
  • We make uncomfortable and difficult decisions even in the face of losing out in the short term. Like shutting down a product because it no longer fits with the overall strategy of the company. We believe in prioritizing our long term goals over avoiding short term pain.
  • It is easy to push a project or decision through when you think it’s a good idea, but we make sure we consult others and carefully consider the unintended impact we might be having before we rush ahead. 

Craft at speed.

We work with great care and skill, sometimes at an uncomfortably fast pace. Rather than aim for perfection in one at the expense of the other, we balance attention to detail with speed of delivery.

What does this value look like in action?

  • We balance excellence in our work with speed of delivery. Smaller chunks of exceptional work can be far more impactful than large volumes of mediocre work. 
  • We use a phased approach for the projects we’re working on. Constantly iterating and getting buy-in from our stakeholders is better than delivering an entire project over a longer timeframe and missing the mark on what we wanted to achieve or create.
  • We over communicate with our managers and teams, and continuously adjust the scope of projects. This helps us if we’re worried about our ability to deliver it in a short enough time frame.

We don’t move straight to execution mode to simply tick items off our to-do list. We pause to understand the long-term view, and the purpose behind the project we’re working on, then move to execution. It’s not just about getting things done, it’s about getting the right things done well, in a thoughtful and purposeful way.

What does it mean to be #HumanFirst?

Tessian Reviews

  • Featured Review

    Helpful (1)

    "Awesome experience all round!"

    • Work/Life Balance
    • Culture & Values
    • Career Opportunities
    • Comp & Benefits
    • Senior Management
    Former Employee - Anonymous Employee in London, England
    Former Employee - Anonymous Employee in London, England
    Positive Outlook
    Approves of CEO

    I worked at Tessian full-time (Less than a year)


    Every day has a new challenge and you feel really supported in whatever you do in the company. The culture is amazing and the senior team have a clear vision and direction for where they want to take the company I would highly recommend.


    It is very fast-paced and it does at times feel like you will have to juggle a lot. However, if you can do it then you'll be amazed at how far you have come.

    Advice to Management

    keep it up!

See All 85 Reviews

Tessian Photos

Tessian photo of: Engineering at Tessian
Tessian photo of: Tessian's Plus LGBTQ+ Employee Group
Tessian photo of: London Office
Tessian photo of: Socializing Space
Tessian photo of: Tessian at LegalGeek
Tessian photo of: Tessian at LegalGeek
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Tessian Interviews



Getting an Interview

Getting an Interview




  1. Featured Interview

    Helpful (1)  

    Python Backend Engineer Interview

    Anonymous Employee in London, England
    Accepted Offer
    Positive Experience
    Easy Interview


    I applied through other source. The process took 2 weeks. I interviewed at Tessian (London, England) in February 2020.


    A phone call to assess interest. This was quickly followed by an online coding test. Then a video call coding test with an engineer (about 1 hour). Finally an in person interview at their office. This was 1h45 of technical questions with 2 engineers. Then 45minutes with the Head of Engineering.

    Interview Questions

    • Design an algorithm for solving the word puzzle, going from a to b changing only one letter at a time, given a dictionary.   Answer Question
    • Write some simple SQL queries.   Answer Question
    • Explain some cyber security concerns.   Answer Question
See All 58 Interviews

Tessian Awards & Accolades

  • 2020 Gartner Cool Vendor, Gartner, 2020
  • Best Cybersecurity Service, HMF European Hedge Fund Services Awards, 2019
  • IT Security Provider of the Year, British Legal Technology Awards, 2018
  • Best Innovation in Data Protection and Privacy, CogX, 2017
  • WIRED Security 2016 Startup Award, WIRED Security, 2016
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