Olly Rennard
Mentor
(18 reviews)
US$30.00
For every 15 mins
32
Sessions/Jobs
ABOUT ME
A senior software engineer with 10 years of experience
A senior software engineer with 10 years of experience
Senior software engineer with 10 years of experience delivering scalable and high-impact systems, now bringing that expertise to AI-powered applications. Confident across the stack and fluent in Python, JavaScript, and TypeScript, with a strong grasp of cloud infrastructure and system design. Experience building solutions spanning modern LLM-based systems, deep learning, and classical machine learning, with a focus on integrating these capabilities into real products. Known for learning quickly, solving hard problems, and building pragmatic, reliable software.
Right now I'm looking for my next adventure so feel free to reach out to me!
English
London (+01:00)
Joined January 2024
EXPERTISE
10 years experience
I've worked with Javascript for a long time now, from Jquery through to Node.js, React, Next.js & React native. I've built modern fronten...
I've worked with Javascript for a long time now, from Jquery through to Node.js, React, Next.js & React native. I've built modern frontend applications and SPAs, Node backends, Lambda microservices and mobile apps.
8 years experience | 2 endorsements
Most of my Python experience is with backend development, primarily using Django, and scripting, e.g. web scraping, data processing, etc....
Most of my Python experience is with backend development, primarily using Django, and scripting, e.g. web scraping, data processing, etc. I've also got experience writing Lambda functions and building GUI apps
6 years experience | 3 endorsements
6 years experience | 2 endorsements
7 years experience | 3 endorsements
6 years experience | 1 endorsement
4 years experience
REVIEWS FROM CLIENTS
(18 reviews)
Chris Westbrook
April 2025
He was awesome. Will definitely be using him again.
Reece Sim
March 2025
Olly was great, super helpful and knowledgeable
Chris Westbrook
March 2025
The session went very well. He really knows his stuff and was a pleasure to work with. Will definitely be using him again.
Rohan Sonar
January 2025
I had a really good session with Olley. He helped me resolve the AWS issue which I was struggling with for a while. I liked his approach towards understanding the issue and would like to highly recommend him for any technical troubleshooting..
Jeanie Jin
December 2024
Olly was a brilliant mentor. He explains concepts really well and is a great communicator
Scott Campbell
September 2024
Olly is absolutely fantastic! I inherited an extremely complex codebase, with some really funny design decisions, and Olly was able to walk me through it, learning quickly on the fly, and mentoring me as I added a new component to the code. Great bedside manner, great at translating difficult concepts into English.
larry rozins
August 2024
Spoke to Olly regarding career and industry guidance. He was extremely helpful, clear and brought tons of experience and insight, and was a pleasure to speak to. My path forward is now much clearer. Thanks Olly!
Sunitha Pillai
August 2024
Thank you Olly I was able to resolve my issues with the layout. Great to work with you!
worksol
August 2024
Olly's great! We built an entire AWS infrastructure, complete with lambda calls and SES buckets, in 90 minutes.
worksol
August 2024
Olly is a knowledgeable guide for using AWS. I will soon work with him again!
EMPLOYMENTS
Software Engineering Consultant
Freelance
2024-07-01-Present
- Built several agentic RAG applications, leveraging Langchain, vector databases, multi agent systems, and OpenAI APIs
- Advised a social...
- Built several agentic RAG applications, leveraging Langchain, vector databases, multi agent systems, and OpenAI APIs
- Advised a social media startup on how to scale their infrastructure and acted as tech lead
- Designed and supervised the infrastructure for a medical platform in partnership with a university
Git
Flask
Debugging
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Git
Flask
Debugging
Pandas
Web Development
NLP
Confluence
System design
SDLC
Cloud Services
Data Pipelines
Feature Modeling
Distributed Systems Engineering
Prompt Engineering
Retrieval-Augmented Generation
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Senior Fullstack Engineer
Co-op
2020-09-01-2024-07-01
- Designed, built, and maintained a suite of internal tools and platforms which provided turnkey implementations of common problems, chie...
- Designed, built, and maintained a suite of internal tools and platforms which provided turnkey implementations of common problems, chiefly written in Python or Typescript, enabling engineering teams to move quicker and the business to save over £100,000 per year
- Managed a large AWS microservices infrastructure, in addition to our inter-team Kubernetes solution, all managed by Terraform
- Guided projects from stakeholder discussions and user story creation to delivery of reliable solutions
- Mentored junior engineers in technical skills and interpersonal development
DevOps
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DevOps
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Full Stack Engineer
Recourse
2019-12-01-2020-09-01
- Worked directly with the CEO and CTO to conceptualise and define the founding product, taking these requirements from high level epics ...
- Worked directly with the CEO and CTO to conceptualise and define the founding product, taking these requirements from high level epics to a feasible architecture, and implementing said architecture as a scalable web app using Django, React, and Unity engine
- Actively driving discussions at every level of the business, including strategy, branding and process
- Managed the full development workflow, including: a Django backend, React and TypeScript frontend, a Unity C#/WebGL integration, API design, server configuration, and deployment processes
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PROJECTS
OpenSeizureDetector - An opensource project to detect epileptic seizures via smartwatches
2022
After having been diagnosed with Epilepsy in my mid 20s I wanted to give something to the community in any way I could, I ended up findin...
After having been diagnosed with Epilepsy in my mid 20s I wanted to give something to the community in any way I could, I ended up finding OpenSeizureDetector, which is a great, opensource application to help users detect seizures via accelerometer data. I initially helped out porting the application to lower cost smartwatches, using micropython, to enable lower income users to use the application. Since then I've also been contributing towards improving the detection algorithm using advanced machine learning techniques.
Feature Modeling
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Feature Modeling
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Sourd'oh - An AI mobile app to help you bake better bread
2023
Sourd'oh is my latest project. Borne of my love of baking bread and my frustrations with getting it wrong. I'm building an app that uses ...
Sourd'oh is my latest project. Borne of my love of baking bread and my frustrations with getting it wrong. I'm building an app that uses computer vision and large language models to identify issues with users' bread and help them diagnose what's wrong it.
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