Dhananjoy Biswas
Verified Expert in Engineering
C++ Developer
Chiang Mai, Thailand
Toptal member since June 7, 2019
Coding since 2010, Dhananjoy started working professionally in 2013. After leaving Google in 2015, he joined a YC-backed startup and scaled it from 3 to a 50+-person team, making it the largest eCommerce company in Bangladesh. From the start, he has always enjoyed taking on new challenges besides his day-to-day work. Dhananjoy is also a 4x IMO (International Mathematical Olympiad) and IOI (International Olympiad in Informatics) medalist and a 2x ACM ICPC world finalist.
Portfolio
Experience
- C++ - 10 years
- Python - 8 years
- React - 6 years
- Node.js - 4 years
- TensorFlow - 3 years
- Kubernetes - 2 years
- GraphQL - 2 years
- TypeScript - 2 years
Preferred Environment
Visual Studio Code (VS Code), Vim Text Editor, Ubuntu, MacOS
The most amazing...
...thing I've built is an eCommerce search engine, serving 30+ million products refreshed every six hours and trained using a neural net to auto-learn ranking.
Work Experience
Founder, CEO
re:tune
- Launched re:tune, an AI chatbot and application platform with 20,000+ users across 4,000+ businesses.
- Generated over $1 million in sales within three months of launching, and raised $500,000 in pre-seed.
- Evolved into an enterprise software development platform allowing industry experts to build AI solutions simply by conversing with AI.
Founder, CEO
re:cruit
- Trained and placed Bangladeshi engineers into top Silicon Valley startups, transforming their careers.
- Consulted over two dozen Seed/Series-A startup founders (funded by Y-Combinator and top VCs) on building and scaling engineering teams.
- Helped early-stage startups navigate product-market fit challenges and sustain rapid growth.
Senior Software Architect
Toyota Research Institute
- Led product development initiatives within Toyota’s Automated Mobility team, managing projects related to the vehicle operating system, automated driving, and safety.
- Directed the re-architecture and transition of a legacy system initially developed by external consultants to a modern, internally-managed platform.
- Facilitated strategic cross-team meetings with key stakeholders to define product roadmap and optimize customer acquisition.
Founding Engineer
Backpack (YC S14)
- Designed and built a full-text/image-based product search engine to serve 30+ million products.
- Built a learning to rank model with TensorFlow to automatically learn relevance from user interactions.
- Scaled and maintained several Kubernetes clusters consisting of 200+ nodes and 50+ services, deployed in AWS first and then migrated to GCP.
- Designed and automated processes to streamline logistics and operations.
- Wrote large-scale crawling infrastructure with headless Chrome and serverless technologies to crawl real-time product data and prices from major eCommerce sites, including Amazon, eBay, Walmart, and Best Buy.
Software Engineer
- Built a massively distributed predictive model to predict the rate and frequency of changes in flight prices of hundreds of carriers.
- Scaled the model to analyze hundreds of terabytes of cache data by parallelizing to 5,000+ nodes.
- Optimized the price caching algorithm to use 12% less computing resources, thus massively reducing the cost by freeing up around 150,000 servers.
Experience
On Deck Fellow (2022)
https://joinodf.com/2x World-Finalist, ACM International Collegiate Programming Contest (ICPC)
2x Medalist, International Mathematical Olympiad (IMO)
https://www.imo-official.org/results/contestant/20844/2x Medalist, International Olympiad in Informatics (IOI)
https://stats.ioinformatics.org/people/2729Skills
Libraries/APIs
Node.js, React, TensorFlow, Stripe, Twilio API
Tools
BigQuery, Google Kubernetes Engine (GKE), Vim Text Editor
Languages
SQL, JavaScript, ECMAScript (ES6), Python, TypeScript, C++, C++17, R, GraphQL, Haskell, Java
Frameworks
Express.js, Redux, Serverless Framework, React Native, Next.js
Platforms
Linux, AWS Lambda, Amazon Web Services (AWS), Google Cloud Engine, Kubernetes, Docker, Google Cloud Platform (GCP), Firebase, MacOS, Ubuntu, Visual Studio Code (VS Code), Android
Storage
MySQL, Elasticsearch, Redis, PostgreSQL
Paradigms
DevOps
Other
Computer Vision, Natural Language Processing (NLP), Deep Learning, Serverless, Data Mining, Machine Learning, Algorithms, Google Cloud Functions, Generative Pre-trained Transformers (GPT), Data Science, Data Cleaning, Mathematics, Video Streaming, WebSockets, Artificial Intelligence (AI), AI Agents, Enterprise SaaS, Startup Consulting, Cloud Infrastructure, Research, System Architecture, Enterprise Resource Planning (ERP), Data Structures
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