Our portfolio companies are always looking for great people. Apply to the opportunities below or send us your profile.

Site Reliability Lead at Tessian
London, GB


We believe technology should secure the digital interactions of employees without compromising user experience or productivity. That’s why we’re building the world’s first Human Layer Security platform. 

We’re a team of mathematicians, data scientists & engineers building breakthrough machine learning and natural language technologies to analyse, understand & protect enterprise email networks.

Tessian is backed by leading technology investors Sequoia Capital and Accel who have helped build many industry defining companies including Stripe, Spotify, Crowdstrike and Docker.

We'd love to hear from you.

Platform at Tessian

Read more about Engineering at Tessian:

We're looking for an experienced Tech Lead join the Platform Team at Tessian. The Platform Team is responsible for defining and operating the infrastructure upon which our development teams depend.

Platform at Tessian has three key focuses:

Empowering and supporting our engineering teams - we have ambitious growth plans for all of Engineering and Platform will be crucial in unlocking the whole department’s potential.

Maintaining the reliability and security of our platform - as a security company, the protection of our customer data and the availability of our systems is paramount to our success.

Supporting new customers - as we expand into the Enterprise we are scaling both in number, size and complexity of clients.

We’re looking for someone to lead us technically and manage key stakeholders in the business as they define the future vision of the Tessian Platform.

You will be joining as a technical leader (but not line manager) in one of the most critical teams in engineering. 

See more on our Stack Overflow here:

We'd love to meet someone who

Has at least 5 years of AWS and “DevOps” experience

Ideally some of which is in a leadership role

Has experience with stakeholder management or as a product owner

Is a great problem solver who takes pride in their work

Enjoys building scalable and resilient systems

Has strong experience managing a range of production applications in a distributed and highly available AWS environment

Has experience with and is opinionated about containerization (Docker) and a container orchestration systems (e.g. ECS/Kubernetes/Swarm)

Has experience with infrastructure as code (Terraform)

Has a deep understanding of Linux operating system and administration skills, and shell-scripting skills

Has a deep understanding of server/network security concepts and implementations

Has created and worked with microservice infrastructures

Programming knowledge, preferably Python

[Bonus] Experience deploying solutions to and working with enterprise clients.

Why we think you'll love it here

It’s important to us that all Tessians are part of the journey we’re on, so we offer equity options with every role and benchmark to provide above market rate salaries - there’s plenty more too….

Be at your best, both inside and outside of work

A full week of work-remote a year, in addition to 25 days of paid holiday

Flexible working hours and working from home

Curate your career with development experiences uniquely suited to you

We’re family friendly, with policies built to support you in all stages of life

High-quality tech kit provided for you to work on including Tessian ANC headphones

Because everyone loves food...

A plethora of breakfast options, delicious snacks, drinks and a top-of-the-range coffee machine

Team lunch provided on Fridays - normally with more hummus than you can shake a stick at

Dinner budget for those times you just can’t tear yourself away

Beyond work

Elite membership of the Tessian House System...

On Fridays we stop at 5 and share team updates and drinks

Monthly team socials & a big, whole team extravaganza every quarter

Never-ending ping-pong tournaments.

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