
Sachin Mour
Verified Expert in Engineering
Node.js Developer
Copenhagen, Denmark
Toptal member since May 7, 2017
Sachin is an accomplished full-stack and machine learning engineer with nearly a decade of experience developing impactful solutions for enterprise and SMB clients. He has successfully led teams, guiding projects from conception to completion. Sachin focuses on using the right technology for each project. With nearly 200 five-star reviews from fellow engineers on Code Mentor, he has a proven track record of delivering high-quality solutions while mentoring and leading teams.
Portfolio
Experience
- Node.js - 15 years
- Full-stack - 15 years
- TypeScript - 10 years
- DevOps - 10 years
- React - 10 years
- Serverless - 10 years
- D3.js - 8 years
- React Native - 8 years
Preferred Environment
Amazon Web Services (AWS), TypeScript, Node.js, React, React Native, DevOps, Python, Google Cloud Platform (GCP)
The most amazing...
...thing I've built is a dom renderer inside web workers that allows for some incredible performance inside a browser and helps save a ton of money for customers.
Work Experience
CTO
Emblem
- Built an agentic RAG platform indexing 10+ million pages, achieving 100% on the Vectara RAG benchmark using hybrid search (vector, BM25, HyDE) with Reciprocal Rank Fusion and LLM verification.
- Led SOC 2 compliance efforts, implementing encryption, IAM controls, audit logging, and monitoring infrastructure to meet all required security controls.
- Designed a multi-stage document pipeline processing PDFs, spreadsheets, and transcripts through OCR, graph detection, embedding generation, and vector indexing with automatic failure recovery.
- Built financial metrics extraction that structured revenue, EBITDA, and growth rates from unstructured documents, reducing analyst review time from hours to seconds with page-level citations.
- Provisioned production infrastructure with Docker Swarm, Grafana monitoring, PostgreSQL backups, and CI/CD pipelines, cutting deployment cycles from days to minutes.
Lead Software Engineer
See On Me LLC
- Developed a cross-platform mobile app that allows users to upload photos/videos to create personalized digital personas for AI-powered virtual try-on experiences.
- Built and implemented the first draft of an AI model that overlays garments onto user photos using generative techniques.
- Integrated AWS services, including Amazon S3 and API Gateway, to store user data and process AI-generated images for the virtual try-on feature.
- Collaborated with back-end engineers to deploy AI models on Amazon EC2 instances with GPUs, optimizing AI model inference for personalized garment visualization.
Lead Software Engineer
Bilt Technologies Inc
- Developed a React Native mobile app helping both renters and property managers earn loyalty points they can exchange for dinners, flights, etc.
- Reduced the time from development to production from days to minutes by automating every part of the pipeline.
- Improved the app's performance to ensure it's always 60 frames per second.
- Maintained a test coverage of over 70% for all code using Jest and Appium for end‑to‑end testing.
Lead Engineer
Verizon Media
- Led a team to implement and support dozens of new product features.
- Created the back-end architecture from scratch, considering the project's needs and near-term future scope.
- Built a web-based 3D modeling tool to help content creators create models used in NFL, HuffPost, and Yahoo.
- Developed a way to keep multiple databases in sync using streams.
- Kept the response time of all synchronous communications below 300 milliseconds.
Senior Full-stack Software Engineer
Issuu
- Developed next-generation tools to help creators create and share content efficiently.
- Worked with the development team to establish coding standards and monitored guidelines that provided prompt feedback to allow for timely adjustment and revalidation.
- Created the technical approach of projects throughout all phases of the software development lifecycle.
- Learned and worked on machine learning algorithms to help extract articles and their content to reduce the manual work needed from the users.
- Developed the back-end entities written in OCaml capable of serving north of 100 million unique users every month.
Lead Software Engineer
NYC Outward Bound School
- Built a dashboard to help manage student data for different user levels using React, Redux, Webpack, and Node.js—which saved the company more than $10,000 per year by removing their dependency on their old system.
- Created a way to visualize their data in order to help them determine key variables through which they can improve their students' success.
- Engineered a way to upload different types of data and parse them in one single-sourced database.
- Developed a backup and restore system for emergencies.
- Created a method to export each and every piece of data.
- Led a team of four software engineers to implement dozens of new product features and release the product in a timely manner.
Senior Software Engineer
Danske Bank
- Developed a cross-browser financial platform for companies called using reactive programming, Cycle.js, React, and more.
- Improved developers' onboarding experience on the platform and supported other teams within the organization.
- Wrote multiple libraries to be used by other teams to help them build for and talk (SDK) with the platform.
- Made architectural decisions with a full-stack overview.
- Implemented automated end-to-end testing and integrated them with automated pipelines using GoCD.
- Established automated pipelines to build, test, and deploy code from committing the code to the customer using new features.
- Worked with a number of centralized monitoring environments (Grafana, AppDynamics, Kibana) which gather system metrics.
- Managed deployments, releases, static servers, bugs, and issues.
- Led a team of three software engineers to implement dozens of new product features.
Software Engineer
K15t Software GmbH
- Performed software development tasks like prototyping, feature development, bug fixing, unit testing, and writing automated functional tests.
- Collaborated with product owners and UI designers to create an excellent user experience.
- Worked with a team of talented developers and designers to build simple, beautiful, and consistent user experiences for web apps.
- Built the back end to provide REST APIs using AWS Lambda, Node.js, and more.
- Developed the front end to efficiently create bug-free user interfaces using React, Redux, and more.
- Helped other developers to build testing guidelines as needed.
Front-end Developer
Roomsie
- Converted designs from Photoshop to a real product.
- Helped other developers set up guidelines and best practices for a similar structure while writing code.
- Reduced time to act on bugs from weeks to days by creating detailed documentation on the bugs reported and possible solutions for them.
Software Engineer
Brainbuild
- Developed their mobile platform using React Native.
- Implemented a push notifications server for the application.
- Took part in implementing the mobile design and reduced friction between designers and developers, improving the delivery times from months to weeks.
Software Engineer
Saferide Health
- Created a notification system for the app dashboard to help manage different user notifications.
- Developed a chat system for customer support to help the clients to make better use of the application.
- Supported the development of the mobile application using React Native and Redux.
- Aided in the improvement and development of the user interface (UI) using HTML, CSS, and JavaScript.
Software Engineer
Freelancing
- Utilized the development of the front-end with client-side validation, middle-tier development, and back-end management effectively.
- Created various visualizations using D3.js, making them work with React and Redux.
- Met with clients to discuss projects and gather requirements.
- Monitored the progress against task estimates to provide status updates to clients and to ensure that the project was on track for the expected completion date.
- Planned, documented, and executed plans to ensure all code changes met the requirements.
Experience
Joybird
https://joybird.com/I was the full-stack developer working on creating both the mobile and desktop experience, which is connected with contentful APIs to give a straightforward way to customize content by product managers at any point in time.
Danske Bank — District, a Financial Business Dashboard
https://danskebank.co.uk/business/products-and-services/ways-to-bank/districtI was the senior software engineer working on creating a platform where third-party developers could develop apps for our dashboard and put them into the marketplace for business customers to buy.
Issuu — Digital Publication Made Easy
https://issuu.com/As a full-stack developer, I worked on the front end to create custom editors, an HTML5 Canvas PDF reader, and on the back end to support the corresponding APIs. We used OCaml for the APIs that need to be insanely fast.
Agentic RAG Platform for Document Intelligence
https://emblem.peCertifications
Machine Learning Foundations: A Case Study Approach
University of Washington via Coursera
Advanced Algorithms and Complexity
UC San Diego via Coursera
Data Structures
UC San Diego via Coursera
Algorithms on Strings
UC San Diego via Coursera
Algorithms on Graphs
UC San Diego via Coursera
Algorithms: Design and Analysis, Part 2
Stanford via Coursera
Data Visualization Projects
FreeCodeCamp
Back-end Development
FreeCodeCamp
Algorithmic Toolbox
UC San Diego via Coursera
Algorithms: Design and Analysis, Part 1
Stanford via Coursera
Front-end Development
FreeCodeCamp
Codility Golden Award for the Calcium 2015 Challenge
Codility
Skills
Libraries/APIs
Protobuf, API Development, JSON API, Moment.js, Lodash, React Router, React Redux, Node.js, jQuery, React, Passport.js, Rollup.js, Shopify API, REST APIs, MobX, Chart.js, React Query, Stripe, WebRTC, React Navigation, React Redux Form, Highcharts, Claude API, Playwright, Amazon Marketplace Web Service (MWS), D3.js, Flightplan, Skyscanner
Tools
GitHub, NGINX, AWS Fargate, Amazon CloudWatch, AWS CloudFormation, Front-end Build Tools, Redux Thunk, NPM, Mongoose, PM2, Babel, Webpack, Webpack 2, Webpack 4, Webpack 3, Rollup, IntelliJ IDEA, Expo, Amazon Simple Queue Service (SQS), SendGrid, Amazon Elastic Container Service (ECS), Claude Code, Claude, Amazon Cognito, Prisma, Vitest, Plaid, Sentry, AWS Step Functions, Expo.io, RabbitMQ, Sketch, Google Vision AI
Languages
Java, SQL, Python, CSS, HTML, CSS3, ES7, ES8, JavaScript, ECMAScript (ES6), TypeScript 3, TypeScript, TypeScript 2, GraphQL, SCSS, Sass, C#, Bash, Kotlin, Go, OCaml, PHP
Frameworks
Cycle.js, Yarn, React Native, Material UI, Jest, Express.js, Redux, Next.js, NestJS, Tailwind CSS, Selenium, Swagger, JSON Web Tokens (JWT), LangGraph, Agentic Frameworks, Remix, Hapi.js, Ruby on Rails (RoR), TYPO3, Flutter
Paradigms
DevOps, Web Architecture, Requirements Analysis, Promise, Model View Controller (MVC), Testing, REST, Microservices Architecture, Microservices, Lambda Architecture, Serverless Architecture, Mobile Development, Test-driven Development (TDD), Clean Architecture, Role-based Access Control (RBAC), Dependency Injection, REST API Architecture, Modular Design, ETL, Model Context Protocol (MCP), Agile Product Management, B2B, Functional Programming, Business Intelligence (BI)
Platforms
MacOS, Amazon EC2, AWS Lambda, Web, Kubernetes, Amazon Web Services (AWS), Firebase, Azure, Docker, Google Cloud Platform (GCP), Contentful, Mobile, Azure IaaS, Vercel, LangSmith, Mapbox, iOS, Shopify, Android, Medusa
Storage
Neo4j, Amazon DynamoDB, MongoDB, JSON, Elasticsearch, MySQL, Cloud Firestore, Google Cloud, PostgreSQL, Amazon S3 (AWS S3), NoSQL, Redis Cache, Database Migration, Database Architecture, On-premise, Relational Databases, Redis
Industry Expertise
Healthcare, Cybersecurity, Project Management, Accounting, Travel & Leisure
Other
eCommerce, SaaS, Serverless, Most.js, Libraries, JavaScript Libraries, Architecture, Minimum Viable Product (MVP), Middleware, Axios, Authentication, User Authentication, Validation, Data Visualization, Google Material Design, Full-stack, APIs, UI Libraries, eCommerce APIs, Web Usability, Integration, SDKs, Software Architecture, Front-end, Back-end, Lambda Functions, Full-stack Development, API Design, API Testing, Large Language Models (LLMs), Artificial Intelligence (AI), Supabase, Web Development, Cloudflare, Content Management Systems (CMS), Headless CMS, Strapi, Data Modeling, CI/CD Pipelines, Charts, Dashboards, Analytics, Technical Leadership, API Integration, Nutrition & Supplements, Mobile Apps, Biometrics, Mobile App Development, Cloudinary, OpenAI, Containers, Web Security, Large-scale Projects, Mobile Architecture, Apollo, Repository Pattern, Security, Prompt Engineering, Domain-driven Design (DDD), Agentic AI, Fraud Prevention, Reliability, Payments, Identity Verification, Engineering, CTO, Retrieval-augmented Generation (RAG), Anthropic, System Architecture, Code Auditing, Performance Optimization, Vector Databases, OAuth, Back-end Development, Legacy Code, Multi-tenant SaaS, Quality Assurance (QA), Fractional CTO, Document Parsing, Workflow Automation & System Integration, Scalability, Auditing, Monitoring, Telemetry, LangChain, Agentic Coding, Machine Learning Operations (MLOps), Cursor AI, Real-time Data, WebSockets, RESTFul APIs, Generative Artificial Intelligence (GenAI), HIPAA, Temporal, Containerization, AI Product Strategy, Agentic RAG Systems, Enterprise Software, Engineering Management, Software Development, Cloud Infrastructure, Compliance, Data Governance, IT Project Management, Resource Management, Startups, Delivery Management, Fintech, SaaS Security, Web Application Security (Web AppSec), IT Security, AI Architecture, Cloud, Cloud Architecture, Consulting, Infrastructure, Infrastructure Architecture, Solution Architecture, Technical Architecture, Code Review, Hands-on Implementation, High Code Quality, Leadership, Scaling, Mentorship, Distributed Systems, Financial Services, Team Management, PCI DSS, SOC 2, Payment Processing, Payment Gateways, Financial Modeling, Front-end Development, AI Product Management, Product Planning, Software as a Service (SaaS), AI Automation, COO, Standard Operating Procedures Development, Headless Commerce, Observability, SvelteKit, Application Security, Payment APIs, Agentic AI Systems, Time Management, App UI, Queuing Systems, Proxy Servers, HAProxy, Framer, Data Engineering, Vite, Flight Management, Travel, Image Recognition, Image Processing, Machine Learning, TurboPuffer
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