Sudhanshu Jha
Senior Full Stack Engineer
5+ years building product systems in environments where revenue, reliability, and user trust are on the line. My background spans fintech, Web3 payments, marketplace infrastructure, and high-growth consumer products, with a strong technical edge across the full stack: frontend architecture, backend services and data layers, async state modeling, and integration-heavy workflows. I'm most useful where the product is complex, the stakes are real, and the work requires both engineering depth and product judgment.
Impact
0 to 1
founding engineer on a B2B SaaS
Lumo
Creator-Marketing SaaS
Took a TikTok Shop creator-marketing platform from an empty repo to production in under six months, owning it end to end: the creator outreach and campaign engine, samples and fulfillment, the subscription and usage-limit layer, access control, and the pipelines it all ships on.
$100M+
monthly transaction volume
Mesh
Fintech / Web3 Payments
Led frontend and workflow architecture for payment-critical flows. Designed async journeys across crypto and fiat rails, external integrations, and high-trust financial UX.
20,000+
vendors on one platform
Wayfair
Marketplace Infrastructure
Owned vendor-facing platform supporting a 30M+ product catalog. Drove monorepo migration and standardized architecture across 8+ product teams.
Experience
Founding Engineer
Mar 2026 – Present·London, UK (Remote)
Took a TikTok Shop creator-marketing SaaS from zero to production, owning it end to end from architecture through to the testing and deployment pipelines.
- Creator outreach and campaigns. Sellers reach thousands of creators across TikTok DMs, collaboration invites, and email. I put all three channels behind one internal sending system rather than building each separately, which is what makes it possible to enforce sending limits, never contact the same creator twice, and know which message led to a sale.
- Samples and fulfillment. TikTok's systems are slow and occasionally lose records, so the dashboard reads from our own copy of the data rather than asking TikTok on every page load, kept accurate by a background process that repairs missing records.
- Subscriptions and usage limits. Pricing plans, Stripe checkout, subscriptions, and the usage limits attached to each plan. Stripe stays the source of truth for billing, but no page waits on it to load.
- Access control and reliability. Each customer sees only their own brands and shops, enforced by the database itself rather than trusted to application code.
Senior Frontend Engineer
Jul 2025 – Feb 2026·Remote
Led frontend and workflow architecture for payment-critical flows supporting $100M+ in monthly transaction volume. The work involved designing reliable async state machines, coordinating external integrations across crypto and fiat rails, and ensuring production-grade behavior in high-trust financial contexts.
- Owned end-to-end architecture for multi-step payment and transfer flows across crypto and fiat rails
- Designed async workflows with robust state handling across external integrations and blockchain networks
- Introduced E2E testing and performance monitoring in revenue-critical user journeys
Software Engineer II
May 2023 – Jun 2025·Remote
Worked on marketplace infrastructure powering 20,000+ vendors and a 30M+ product catalog, focused on scalability, maintainability, and cross-team architectural consistency in a large distributed product org.
- Architected marketplace platform features for catalog management and vendor operational workflows at scale
- Led monorepo migration of legacy systems, improving deployment reliability and team velocity
- Standardized shared frontend patterns across 8+ teams to reduce duplication and accelerate delivery
Software Development Engineer
2021 – 2023·India
Worked across CMS, content moderation, and consumer-facing features in a fast-growing platform. Shipped React Native features that improved core user metrics and helped scale the product during peak growth.
- Built and maintained CMS supporting operational workflows and content moderation systems
- Integrated frontend systems with backend services for critical admin and moderation workflows
- Shipped React Native features for a consumer platform, contributing to growth from 50k to 200k+ active users
- Delivered Kotlin-based Android features, expanding product coverage across platforms
Earlier
Full Stack Developer
Spark Esports2021·India
Contributed to MVP delivery across frontend and backend systems in a startup environment
Frontend Engineer
eFeed2021·India
Built React and React Native features for a real-time marketplace product
Web Developer
Webloom Solutions2020·India
Delivered client-facing e-commerce solutions end to end
Skills
Product Systems
Backend & Data
APIs & Integrations
Reliability & Quality
Performance & Delivery
How I Work
Workflow Architecture
The hardest product problems are usually workflow problems. I design async flows that handle the messy middle of partial failures, external dependencies, and edge cases, not just the happy path.
Integration-First Thinking
Real product systems talk to external services constantly. I design for integration failures, retries, and degraded states from the start, not as an afterthought.
Reliability Over Cleverness
Users trust systems that behave predictably. I spend as much care on error states as success states, and prefer boring, legible code over smart code that surprises teammates.
Frontend Architecture
Good frontend architecture ages well. Separate concerns clearly, keep state close to where it's needed, and design component APIs that are hard to misuse.
Product Execution
Engineering judgment matters most when tradeoffs are unclear. I ask about impact before scope, ship incrementally, and measure what changes, not just what shipped.