Web application development
End-to-end product development with React, Next.js, TypeScript and Node, backed by GraphQL or REST APIs. Booking and checkout flows, dashboards, internal tools and data-heavy interfaces.
Software studio · Sofia, Bulgaria
Web development and consulting
We design, build and scale web and mobile applications, from architecture and user interface to APIs, delivery pipelines, hosting and monitoring. We take ownership of the whole product so it ships quickly and stays reliable in production.
- 9+
- years of engineering experience
- 2023
- founded in Sofia, Bulgaria
- 6
- industries served: travel, fintech, SaaS, e-commerce, media, Web3
Services
What we do
Senior-level engineering for teams that need someone to own the outcome.
Performance optimization
Core Web Vitals, bundle size and load-time work measured against real user data. We find what is actually slow in production and fix that first.
Observability and reliability
Datadog RUM, critical-path metrics, anomaly monitors and alerting built from scratch, plus Playwright end-to-end coverage that protects revenue paths from regressions.
Architecture and reusable systems
Package systems, component platforms and shared tooling that cut delivery time for every project that follows the first one.
AI integration
LLM-powered features built into new and existing products: assistants, summarization, classification and generation, wired to your data with retrieval and tool use.
Vector databases
Embedding pipelines and vector stores for semantic search, recommendations and retrieval-augmented generation over your own content.
Native mobile applications
iOS and Android apps built with Capacitor from a shared web codebase, including native plugins, store builds and App Store and Google Play releases.
DevOps and delivery automation
CI pipelines that validate commits and run the test suite on every change, plus automated deployment, release and tagging pipelines so shipping is a non-event.
Hosting and infrastructure
Secure VPS setups for applications handling sensitive data, using NGINX, certbot, PM2 and Node, or managed deployments on Vercel.
Selected results
Work that moved the numbers
Audio streaming platform for web, iOS and Android
Built the audio streaming web application for a client and shipped it as native iOS and Android apps with Capacitor from the same codebase. Added AI features backed by embeddings and a vector database, with semantic search across the catalog.
Set up the delivery pipeline end to end: commit validation and the full test suite on every change, automated deployments, and release and tagging pipelines that take a build from merge to production and the app stores without manual steps.
Large-scale booking platform serving Priority Pass, Amex, Mastercard and HSBC
Owned architecture and performance for a Next.js / TypeScript booking platform. Led delivery of entitlement-based booking for Amex Platinum and Centurion cardholders, integrating benefit eligibility across booking and payment flows.
- 1.77% → 0.05% application error rate
- 73% → 99.7% session success rate
- 3.32s → 2.25s Largest Contentful Paint
- 152ms → 95ms Interaction to Next Paint
- Up to 54% smaller bundles across Booking, Checkout, Payment and Partner Management
- 8 P1–P4 anomaly monitors and Playwright coverage of every revenue path
Workflow automation for local businesses
Built and shipped two internal products and three client implementations that automate administrative work, cutting translation and proofreading costs across a 1,000+ product Shopify catalog. A reusable package system enables 80%+ code sharing between projects, all running on a secure VPS built for handling sensitive data across API integrations.
Laboratory booking platform migration
Migrated Clustermarket from a Ruby-based architecture to Svelte and GraphQL, serving 40k daily active users across 5,000 laboratories. Built the equipment booking calendar with drag-to-create slots and an equipment management table with fuzzy search and quick actions.
NFT marketplace and cross-chain bridge applications
Built the web application for Universe.xyz, an Ethereum NFT platform with minting, marketplace and multi-tier auctions integrated with smart contracts via ethers.js, and for AllianceBlock, a token bridge across Ethereum, Polygon and Avalanche, handling wallet connection and transaction signing.
About
Founded and run by Asen Angelov
Asen is a software engineer with 9+ years of experience building and scaling web applications across travel, SaaS, Web3 and e-commerce. He has led product delivery on platforms serving hundreds of thousands of cardholders, migrated production systems to new stacks, shipped automation tools and integrations for businesses, and built observability and testing from scratch where none existed.
Indepth Solutions EOOD was founded in Sofia in 2023 to take on that kind of work directly: engagements where one experienced engineer owning architecture, delivery and reliability makes a measurable difference.
Languages and frameworks
TypeScript, JavaScript, Node, React, Next.js, Svelte
Data and APIs
GraphQL, Apollo, REST, third-party integrations
Testing
Playwright, Jest
Observability
Datadog RUM, monitoring, alerting
Performance
Core Web Vitals, bundle optimization, Lighthouse
AI and search
LLM integration, embeddings, vector databases, semantic search
Mobile
Capacitor, iOS and Android builds, store releases
DevOps
CI/CD pipelines, automated tests and commit validation, release and tag automation
Platform
Ubuntu, NGINX, certbot, PM2, Vercel
References
What managers and founders say
Recommendations from people Asen has reported to or worked alongside.
I highly recommend Asen for any Front End Engineering role.
During his time at Clustermarket, he consistently delivered outstanding work, showcasing a strong command of software engineering principles.
Asen not only adapted quickly to our dynamic environment and technology stack, but also excelled in tackling challenging tasks with efficiency. His talent, combined with a deep understanding of advanced software practices, makes him a valuable addition to any software engineering team.
I am confident that Asen's contributions will exceed expectations, and he will be a tremendous asset to your organization.
Asen is a highly skilled and motivated developer with whom I have had the pleasure of working on several challenging games.
His passion for his craft is evident in every task he undertakes, resulting in consistently high quality results.
His contributions to the company set the tone for development principles that we still follow today, where his solutions have significantly improved the production time and end results of our games.
I highly recommend Asen for his professionalism and attention to detail in his work, as his problem solving skills make him an invaluable asset to any team.
My name is Ivan Dzholev, and for a year I was directly responsible for Asen.
Asen is self-motivated, constantly learning in his free time, and diligent in his work.
While we worked together, he had many brilliant suggestions on how to improve the code and processes. He also never stopped getting better.
Any team would be lucky to have him.
It is with pleasure that I write this letter to recommend Asen Angelov for the position of Software Developer. During the period from December 2017 to October 2019, I had the privilege to work with Asen as his company manager at Max Win Gaming LTD.
During this period, Asen demonstrated exceptional programming skills and software development, as well as an unwavering commitment to the quality of our products. The employee flawlessly performed all functions typical of developing games and applications, contributing significantly to our projects.
Asen Angelov has excellent professional knowledge and skills. He knows how to work in a team, shows creativity in problem solving as well as the ability to deal with given tasks.
I confidently recommend Asen Angelov for the position of software programmer, as I am convinced that he will do an excellent job with any task and any project he is assigned.
Despite unfortunate circumstances leading to Asen's departure, he consistently demonstrated remarkable dedication, motivation, and reliability.
His rapid learning abilities, coupled with strong technical knowledge, made him an invaluable asset to our team. Asen is not only a skilled developer but also a genuinely nice person.
I highly recommend him and am confident he will excel in his future endeavors.
Asen has the drive and curiosity to succeed. Any company that does not have people with such curiosity will undoubtedly fall into mediocrity.
Asen showed a wide range of expertise in numerous fields throughout our time together at Grind. By now, I'm sure his knowledge base has grown.
Contact
Have a project in mind?
Tell us what you are building and where it hurts. Every message gets a personal reply.
asen.angelov@indepthwebsolutions.com