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Δημήτρης John ΡάπτηςJ
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Δημήτρης John Ράπτης

@john1

Team Lead at Oak’s Lab, improving AI-agent workflows with guardrails and the context agents need to do quality engineering work.

Greece
Message

At Oak’s Lab, I lead an initiative to make more efficient use of AI tools and agents in the engineering team. I’m establishing processes for guardrails and agent skills, and ensuring agents have the context they need to do quality work.

At Manual, I helped establish practices as the team grew from three in-house engineers to more than 30. I introduced code reviews, QA processes, and knowledge-sharing sessions, and line managed five remote engineers.

At Manual, I also owned the internal operations backend tool, from feature elicitation through full-stack development. I handled backend and frontend work, including A/B tests, and owned internal libraries for analytics, pricing display, and experiments.

At Forky, I developed internal operations tools, including a live delivery map and a driver mobile app, and wrote a real-time delivery-routing algorithm based on Simulated Annealing. I hold an MSc in Computing Systems Technologies and a BSc in Computer Science from the National and Kapodistrian University of Athens.

Experience

Work history, roles, and key accomplishments

OL
Current

Team Lead

Oak's Lab

Jan 2026 - Present (9 months)

Led an initiative to make more efficient use of AI tools and agents in the engineering team, establishing processes to maintain guardrails and agent skills. Managed a demanding inflow of multi-stream work requests from the client, ensuring priorities were met and maintaining clear communication.

MA

Lead Engineer & Team Lead

Manual

Jan 2022 - Dec 2025 (3 years 11 months)

Grew the team from three in-house engineers to more than 30, establishing practices to support this growth including code reviews, QA processes, and knowledge spreading sessions. Established ceremonies to manage the flow of work, including kanban and intra-team meetings, and line managed a team of 5 remote engineers.

MA

Senior Software Engineer

Manual

Jan 2018 - Dec 2022 (4 years 11 months)

Joined as one of the first in-house engineers, handling both backend and frontend tasks, including full-stack projects like A/B tests. Singlehandedly owned the internal operations backend tool, including feature elicitation and all full-stack work, and owned several internal libraries for analytics, pricing display, and A/B tests.

WP

Lead Engineer

Welcome Pickups

Jan 2017 - Dec 2018 (1 year 11 months)

Managed a team of 5 remote engineers and spearheaded the roadmap for an SEO generating product. Drove the restructuring of the tech department during company growth, implementing processes for employee feedback and tech debt through 1-on-1 sessions, retrospective meetings, and structured planning sessions.

FO

Head of Mobile

Forky

Jan 2017 - Dec 2017 (11 months)

Led the development strategy and roadmap for Android and iOS apps in coordination with designer and product manager. Supervised an iOS contractor while personally maintaining the Android app through multiple complete overhauls to align with evolving product strategy.

FO

Senior Software Engineer & Operations

Forky

Jan 2014 - Dec 2017 (3 years 11 months)

As one of two founding engineers, singlehandedly held product ownership, feature elicitation, strategy, and hands-on development for internal operations tools. Wrote an ambitious AI algorithm based on Simulated Annealing to manage routing of multiple deliveries in real-time with service-level requirement constraints.

CO

Software Engineer

Cookisto

Jan 2013 - Dec 2014 (1 year 11 months)

Worked as a software engineer focusing on PHP and Symfony2 development.

SL

Tech Lead

Sporting Affiliates Ltd

Jan 2012 - Dec 2013 (1 year 11 months)

Served as tech lead, working with Python and Django.

LP

Drupal Developer

Liberis Publications

Jan 2011 - Dec 2012 (1 year 11 months)

Worked as a Drupal developer using PHP and Drupal.

Education

Degrees, certifications, and relevant coursework

CO

Coursera

Certification, Software Product Management

Completed the Software Product Management certification from the University of Alberta via Coursera in 2018.

NA

National and Kapodistrian University of Athens

Master of Science, Computing Systems Technologies

MSc in Computing Systems Technologies from the Department of Informatics and Telecommunications, National and Kapodistrian University of Athens, completed in 2010.

NA

National and Kapodistrian University of Athens

Bachelor of Science, Computer Science

BSc in Computer Science from the Department of Informatics and Telecommunications, National and Kapodistrian University of Athens, completed in 2007.

Tech stack

Software and tools used professionally

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