Mazz Mosley

Engineering Manager

Overstory

Oct 2025 - Current (1 year 1 month)

Engineering Manager for two fantastic teams building the web product.

Senior Engineering Manager - Platform & Scheduler teams

Autómata

Apr 2023 - Aug 2025 (2 years 5 months)

Platform engineering: Responsible for a high performing team providing world class, high performance cloud and edge first compute platforms comprised of Kubernetes, Docker, Terraform, ArgoCD and AWS technologies. - Hired and grew the team to 6 platform engineers, fostering a culture of curiosity, ownership, and collaboration. - Contributed to the platform engineering roadmap aligning with both organisational growth and ever shifting product/engineering priorities. Moving from cloud first to edge first approach. - Led and managed key 3rd party partnerships. Key one of note was Scalefactory. This successful engagement augmented the team with highly-skilled AWS certified engineers to increase the capacity to complete the transformation project

Engineering Director

Weaveworks

Mar 2021 - Aug 2022 (1 year 6 months)

Stepped into a strategic leadership role focused on scaling engineering culture, improving delivery, and strengthening security practices. Transitioned from day-to-day team management to org-wide impact by hiring and onboarding three new Engineering Managers. Key contributions: - Built strong cross-functional partnerships with Product to bring clarity to roadmaps and de-risk high-uncertainty initiatives - Led an engineering re-org aligning teams to capabilities, reducing overlap, and enabling delivery of a rewritten open-source product aligned with the enterprise offering - Took on ownership of security, leading a service audit and integrating Snyk into CI pipelines to improve vulnerability detection - Authored the Engineering Handbook to c

Senior Engineering Manager

Weaveworks

Aug 2020 - Mar 2021 (8 months)

Joined during a pivotal period to help rebuild engineering teams and bring stability after high turnover. Initially led 3 teams across time zones, focusing on improving delivery by clarifying scope, breaking down work, and restoring confidence in shipping. Key contributions: - Rebuilt teams from the ground up, growing them to 5–8 engineers while embedding a culture of curiosity, learning, and collaboration - Partnered with Product, tech leads, and agile coaching to improve delivery cadence and team clarity - Designed and implemented an inclusive hiring process in the absence of an internal recruitment function - Prioritised people: consistent 1:1s, feedback, and performance support across all levels - At one point managed 24 engineers direc

VP Engineering

Lyst

Aug 2018 - Apr 2020 (1 year 9 months)

Led three engineering tribes across core product data services, customer experience, ranking algorithms, and iOS app development. - Delivered leadership focused on clarity, support, and growth—aligning personal motivations with business and technical strategy. - Acted as unofficial deputy CTO, ensuring high standards for team behavior and deliverables. - Coached the platform engineering team leader and ensured across team devops collaboration - Transformed monthly engineering meetings to foster cohesion and direction. - Partnered closely with CXOs to translate complex technical challenges into clear, actionable options with risk/benefit analysis. - Passionate about cross-functional collaboration, unblocking teams, and mitigating scaling ris

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Lead backend engineer

Aug 2017 - Jul 2018 (1 year)

Transitioned from contractor to lead backend engineer and interim CTO during a key growth phase. Proud to contribute to major launches, including Ralph Lauren’s custom knitwear collections for the Winter Olympics and upcoming seasons. Key contributions:
• Helped hire and retain a diverse engineering team
• Led technical strategy for a new digital print pipeline in partnership with Rapha
• Supported client engagements, including architecture planning for a New Balance integration
• Improved agile processes and contributed to OKR planning, aligning business, tech, and personal goals
• Delivered technical leadership rooted in clarity, collaboration, and pragmatism

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Freelance Senior Engineer

StreetTeam

Jan 2017 - Jun 2017 (6 months)

Brought in to provide Python backend development and stabilize a new team during a major rebuild.
• Led complex data migration from multiple legacy databases to new system models under tight deadlines, adapting quickly to changing business requirements
• Contributed to API development using Django Rest Framework and GraphQL
• Helped dockerize the application with Docker Compose and supported its later transition back to bare metal
• Supported agile processes and fostered a positive, collaborative team culture

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Freelance Head of Technical Operations

Livestax

Nov 2015 - Oct 2016 (1 year)

Initially brought in to build admin apps in Ruby on Rails, I uncovered critical infrastructure issues and led a full rewrite to ensure stability and scalability.
• Rebuilt infrastructure on AWS using Docker Cloud; provided ops tooling, training, and documentation in Python
• Communicated technical risks to senior stakeholders and supported strategic planning during leadership turnover
• Co-led hiring and mentoring of a new engineering team, including tech lead, backend, and frontend developers
• Established best practices and fostered an inclusive, empathetic team culture during a high-pressure transition

Freelance Developer

Docker, Inc

Jul 2015 - Oct 2015 (4 months)

- Hired to work with a small distributed team of inhouse Python developers and wider open source community on Docker Compose: https://github.com/docker/compose. - Officially a maintainer during my time there and I implemented several new features that improved the feedback given to users when using the tooling. - Contributed to design discussions and lots of bug fixing which isn't always reflect in the github contributions graph. - Contributed to improving team agile processes and provided both technical leadership support and cover, while the tech lead was away for over a month.

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Freelance Big data engineer

An Advertising company

Mar 2015 - Jun 2015 (4 months)

- Exciting opportunity to dabble in the realm of data engineering. I had to pick up/learn very quickly Spark, pyspark and HDFS. Also got given a crash course in Bayesian mathematics. - Wrote Python to enable a pipeline to process data and produce insights reports that were critical to business. - Provided documentation for developer process flow and discussion of best practice guidelines.

Freelance Senior Developer

Marks and Spencer

Nov 2014 - Dec 2014 (2 months)

Brought in to stabilize and productionize a Django codebase that had evolved from a prototype to a product needing wider rollout. Applied Django expertise to improve code quality, reliability, and readiness for production use.

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Freelance technologist

ICanMake

Sep 2014 - Oct 2014 (2 months)

- Brought in to consult for all things technical on an initial prototype build of new product, Python & Django.

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Freelance senior developer

May 2014 - Jul 2014 (3 months)

Contributed to a new product build, developing Python APIs with Django Rest Framework as part of a shift from monolith to microservices.
• Helped implement single sign-on, pairing closely with senior engineers on OAuth flows
• Mentored engineers to strengthen agile practices and team communication
• Provided actionable feedback to senior stakeholders on engineering processes and company culture

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Technologist

houseofmnowster ltd

Mar 2014 - Jul 2017 (3 years 5 months)

I help people, I help teams, I solve problems. I write code, guide engineering culture, and support orgs through technical and team challenges. Started House of Mnowster in 2014 to work across a broader range of projects — from backend engineering and DevOps to hiring, open source, and technical leadership.
• Worked with companies of all sizes on infrastructure, developer tooling, and modern tech (GraphQL, Docker, etc.)
• Brought insight into what makes teams succeed: not just code, but culture, communication, and inclusivity
• Passionate about technical leadership and creating environments where people and products thrive

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Freelance developer

Mar 2014 - Apr 2014 (2 months)

- Brought in to use my extensive technical knowledge of GDS Ruby codebase. ODI codebase was a fork of the GDS repos and they needed help bringing them up to date. - Worked on a Ruby prototype, providing some data modelling and API design for ONS.

Tech Lead

Government Digital Service

Mar 2012 - Jan 2014 (1 year 11 months)

Joined as a Senior Engineer without prior Ruby/Rails experience, promoted to Tech Lead within 3 months. Led development of the core platform powering GOV.UK, replacing Directgov and Business Link. Key contributions:
• Led a small Rails/Sinatra team delivering scalable, robust infrastructure and APIs under tight deadlines
• Worked closely with technical architects to implement cross-platform architectural vision
• Successfully launched GOV.UK in Oct 2012, impacting millions of UK citizens
• Led post-launch prototyping to improve site search with Elast

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Senior Developer

Artfinder

Apr 2011 - Mar 2012 (1 year)

Dream software engineer role combining my passions for code and creativity. Helped build a Django-based platform from the ground up to help people discover and buy art.
• Second-in-command on a small dev team, making key architectural and delivery decisions
• Built data import tools to process artwork metadata from galleries and museums
• Contributed to a recommendation engine to improve art discovery
• Led retrospectives and helped shape team culture and agile practices
• Career highlight: met my art hero, Remi Rough 🎨

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Senior Software Engineer

Jan 2010 - Mar 2011 (1 year 3 months)

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Senior Web Developer - Agency

Sep 2008 - Jan 2010 (1 year 5 months)

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Web developer

Kaweb

Dec 2007 - Jul 2008 (8 months)

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Senior Software Developer

Tangozebra

Oct 2002 - May 2007 (4 years 8 months)

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Mazz Mosley

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