Taking new projects Mohali, IN Expert Vetted · Top 1% --:--:-- IST

Expert Vetted · Top 1% · Mohali, India

You imagine. We code. And then we ship it.

SaaS platforms, enterprise systems, and AI integrations — built for Barnes & Noble, Binance, Restoration Hardware, and Exotel. A team of engineers and designers in Mohali, working with clients across eight countries in North America, Europe, the Middle East, and Asia-Pacific.

visitor@codexshark — zsh

Try: help · services · clients · stack

Codexshark · by the numbers 100% job success
0+Engineers & designers In-house, Mohali
0+Products shipped Web · mobile · AI
0+Clients served Startups to Fortune 500
0Countries served Three continents
Markets
United States United Kingdom Germany Switzerland UAE Japan Australia Canada

Selected clients

Products we've built and kept running.

Some for three years and counting. We still support our very first business client.

Retail · Enterprise

Barnes & Noble

Enterprise application work at production scale.

FinTech · Web3

Binance

High-performance systems in a complex enterprise environment.

Retail · Ecommerce

Restoration Hardware

Scalable architecture and product execution.

EdTech · Learning

Bartleby

Homework help and study platform serving millions of students.

CPaaS · Telephony

Exotel

Customer engagement platform handling voice and messaging at scale.

Security · Biometrics

Private Identity

Privacy-preserving biometric identity using homomorphic encryption.

Software · AI

Beehive Software

Engineering partner on custom AI and software builds.

Nonprofit · Platform

Liquid Donate

Sustainable B2B marketplace for liquidation and resale.

Music · Consumer

Rapchat

Social music creation and AI-assisted collaboration platform.

Travel · Ecommerce

CALPAK USA

Ongoing engineering across storefront and internal tooling.

Fashion · Marketplace

Luxury Fashion Rentals

Web application for a rental marketplace, built end to end.

Research · Web app

Waveform

Innovative web applications built with the research team.

Crypto · Exchange

Coin Picks

Exchange infrastructure and wallet integration.

SaaS · Platform

Panoply

Platform engineering support across multiple releases.

Nonprofit · Legal

NIJC

Platform engineering for a legal services organisation.

Sports · Platform

Advance.Football

Technical lead on a football platform, across web and data.

Sports · Web app

Top 22 Picks

State-by-state leaderboard web app for the 2026 season.

Also delivered in Multi-tenant SaaSFHIR & HIPAA healthcare FinTechEcommerceEdTech Job portalsGovernment Web3Aviation & opsATS integrations

About us

A blend of young and experienced, on purpose.

We are small enough that a senior engineer scopes your project, and large enough to staff it properly once it starts.

The team is deliberately mixed — young enough to move with a fast-changing industry, experienced enough to stay steady when a project gets hard. Over 62 contracts we have built a deep pool of applied knowledge, and we use it to deliver work that fits a client's needs, expectations and budget.

No work starts without a written scope. If we cannot describe it clearly, we do not understand it well enough to build it.
No silent months. Daily updates while we build, and every second Friday there is something running you can click.
No lock-in. Documentation and a handover session are part of the price, not an upsell.
Expert Vetted · Top 1% 100% job success
codexshark.jsonread-only
{
"hq": "Mohali, Punjab, IN",
"since": 2020,
"markets": ["US", "UK", "DE", "CH", "AE", "JP", "AU", "CA"],
"team": { "engineers": 45, "design": 9, "qa": 6 },
"cadence": "2-week sprints", // staging URL every sprint
"scope": "written, fixed price",
"ownership": "client, from commit 1",
"subcontracting": false, // no bench you never meet
"handover": "docs + 30 days support",
"longest_client": "first ever, still active"
}
Live

Why choose us

Why choose our digital solutions for your business?

Six reasons clients pick us — and stay.

Design that survives the build

Interfaces designed against real data and real edge cases, handed over as a component library your engineers can build from — not a picture of a product.

Instrumented from day one

Analytics, error tracking and performance monitoring wired in before launch, so you find out what users actually do instead of guessing after the fact.

Enterprise experience

Binance, Barnes & Noble, Restoration Hardware, Bartleby, Exotel and Rapchat — systems that had to hold under real traffic, real compliance and real deadlines.

JavaScript specialists

Certified JavaScript expertise, with React, Next.js and Node.js used end to end — one language across the stack, so context doesn't get lost between frontend and backend.

50+ hours a week, across time zones

Roughly four hours of daily overlap with US Eastern and six with London. Standups land in your morning; you wake to work completed overnight.

Built for the long contract

We would rather maintain what we built than hand over a repository and disappear. We still support our very first business client.

Services

What Codexshark offers.

The full range, with the honest note that we'll tell you when you don't need half of it.

01

Web & mobile app development

Web apps, Android, iOS, hybrid and native — from a founder's first build to an established product's next version. Store submission handled end to end.

ReactNext.jsReact NativeSwiftKotlin4–10 weeks
02

AI & LLM engineering

Retrieval over your own documents, LLM features inside existing apps, agents that call your internal tools — and evaluation harnesses, so you know when a change made things worse.

OpenAIRAGPythonFastAPIOpenCV3–5 weeks
03

UI and UX design

Research, flows, wireframes and a design system your engineers can actually build from.

FigmaDesign systems2–4 weeks
04

Web development

Complex dashboards, multi-tenant SaaS and customer portals that stay fast as the data grows.

Node.jsPostgreSQL4–8 weeks
05

QA & test automation

Regression suites, CI pipelines and load testing, with a written test plan you keep.

Automated suitesCI/CD2–3 weeks
06

Cryptocurrency & blockchain

Smart contracts, wallet integration and exchange infrastructure, built with the security review the category demands. We shipped this for Coin Picks — and we will tell you honestly when a project does not need a chain at all.

Solidityethers.jsNode.js6–12 weeks

Technology

What we build with.

39 tools across six layers, chosen per project, not per fashion. If your team already runs something else, we work in your stack.

FrontendWhat your users touch
8 tools
ReactUI library
Next.jsSSR framework
TypeScriptType safety
ReduxState
Vue.jsUI library
AngularFramework
React NativeiOS + Android
TailwindStyling
Backend & APIsWhere the logic lives
8 tools
Node.jsRuntime
ExpressWeb server
GraphQLQuery layer
PythonRuntime
FastAPIAsync APIs
DjangoFramework
FlaskMicroservices
RESTAPI standard
DatabasesWhere it is kept
6 tools
PostgreSQLRelational
MySQLRelational
MongoDBDocument
RedisCache
FirebaseRealtime
SupabasePostgres BaaS
AI & mediaModels in production
7 tools
OpenAI APILLM
RAGDoc retrieval
LLM workflowsAgents
TensorFlow.jsIn-browser ML
OCRText extraction
OpenCVVision
FaceAPI.jsFace detection
Cloud & DevOpsWhat keeps it up
5 tools
AWSCloud
Google CloudCloud
AzureCloud
DockerContainers
CI/CDPipelines
ArchitectureDecisions that stick
5 tools
Multi-tenant SaaSIsolation
FHIR & HIPAAHealthcare
Auth & RBACPermissions
Workflow automationOps
Distributed systemsScale

Leadership

Who runs the engineering.

vivek.chandelcodexshark/leadership
Vivek Chandel, Chief Technology Officer at Codexshark

Vivek Chandel

Chief Technology Officer · 10 years’ experience

Most agencies put their best engineer in the sales call and their cheapest one on the code. Every project here gets scoped by someone senior, and that person stays on it.

Founding engineer, frontend lead and senior software engineer for Barnes & Noble, Bartleby, Restoration Hardware, Liquid Donate, Private Identity, Rapchat and Binance. He pairs deep technical work with the kind of long collaborations that outlast a single project.

Role
Full-stack engineer · architecture & delivery
Record
100% job success · 62 contracts
Focus
SaaS · enterprise · AI in production
Domains
Healthcare · fintech · ecommerce · aviation
Stack
React · Next.js · Node · Python · AWS
Based
Mohali, IN · 4h overlap US Eastern

Our team

Meet our experts.

A blend of young and experienced — dynamic enough to move with the industry, stable enough to stay when a project gets hard.

vivek.chandelcodexshark/team
Vivek Chandel, Chief Technology Officer at Codexshark

Vivek Chandel

Chief Technology Officer

Founding engineer, frontend lead and senior software engineer for Barnes & Noble, Restoration Hardware, Binance and Rapchat.

Exp
10 years · 6 leading teams
Role
Full-stack engineer · architecture & delivery
Stack
React · Node · Python · AWS
jessica.chancodexshark/advisors
Jessica Chan, Board Advisor at Codexshark

Jessica Chan

Board Advisor · Front-end

Founder of Coder Coder, teaching web development to an audience of 60,000+. Self-taught, with particular depth in CSS and responsive layout.

Exp
10+ years front-end
Owns
Front-end standards
Known
freeCodeCamp course author

Process

From first call to shipped, in five steps.

Every stage has a named output and a date attached to it.

01

Scoping call

20 minutes · free

You describe what you are building. We ask the questions people forget: auth, data volume, who maintains it, what “done” means. You leave with a clearer scope either way.

02

Written scope & fixed quote

3 business days

Every deliverable, the sprint it lands in, what is excluded, and a fixed price. Take the document to another agency if you want — it is yours.

03

Sprint zero

Week 1

Repository, environments, CI, design system and the first architectural decisions in writing. You own the code from day one.

04

Two-week sprints

Ongoing

Every sprint ends with working software on a staging URL you can open yourself, a short written summary and a 30-minute call.

05

Handover & support

30 days included

Documentation, a walkthrough recording and a session with your team. Thirty days of bug support at no charge.

Testimonials

Their reviews make us proud.

Left by clients after the work shipped, not before.

5.0 100% job successAcross every contract completed Expert Vetted · Top 1% Verify →
Upwork · verified

Senior Full-Stack Developer · Aviation Management Platform

Vivek did a great job, will definitely hire again in the future and would recommend to anyone.

464 hours · Nov 2024 – Jun 2025

Upwork clientCommitted to quality
Direct client

Everyone was professional, excellent and hard working. Thanks to them we hit our goal on time, and we are continuing to work together.

Seth MillerFounder & CEO, Rapchat
Upwork · verified

Long-term full-stack contract

He was successful in completing all tasks on time. He is always on time with deadlines.

1,845 hours · longest single engagement

Upwork clientReliable
Direct client

A very professional job on our web application. We are satisfied with the solution and with the communication flow through the whole project.

Elaine HauFounder & CEO, Luxury Fashion Rentals
Upwork · verified

React JS Dev

Vivek is a very mature, responsible and multi-faceted front end developer. He solved all the engineering challenges we presented to him. I am very happy to work with him again.

315 hours · Aug – Nov 2022

Upwork clientSolution oriented
Direct client

Quality service and expertise for our programming needs. It is rare to find a provider with this kind of professional consistency.

Shelby TaylorDesign Lead, CALPAK USA
Upwork · verified

Full Stack Developer

Vivek did a great job over the last 2 years as part of our development team. We would definitely hire him back for more projects.

Embedded in the client team for 2 years

Upwork clientCommitted to quality
Direct client

Professionalism, prompt response and courteous service. We designed innovative web applications that opened new possibilities for our industry.

Juan Carlos B.Research Lead, Waveform
Upwork · verified

Expert Next.js Developer & Mentor

Vivek has been absolutely great to work with. Understood the issue, and got the job done quickly and efficiently. Recommended freelancer!

Issue understood and resolved same day

Upwork clientClear communicator
Direct client

When our own skills did not get us where we wanted, they took care of the rest. The expertise, service and follow-up were flawless.

Ashley AlvaradoFounder & CEO, Coin Picks
Upwork · verified

New app · Next.js + Tailwind + WordPress CMS

Professional, features on time with high quality!

Delivered in 2 days, fixed price

Upwork clientCommitted to quality
Direct client

Wonderful team effort. Their work created new possibilities for what we could offer.

Joshua BoelmanFounder & CEO, Panoply
Upwork · verified

AWS platform work

Good knowledge of the AWS platform, and explained the process in detail. I would like to hire him again.

Upwork clientName withheld
Upwork · verified

Vivek provides a solution-oriented approach, proactively identifies problems, and delivers effective solutions.

Upwork clientName withheld
Upwork · verified

Vivek delivered exceptional performance in a highly complex enterprise environment.

Upwork clientName withheld
Upwork

And plenty more.

We can't list every review here — there are dozens more across years of contracts, all with the same rating.

Read them all →

Get in touch

Tell us what you're building.

Twenty minutes, no pitch deck. You'll come away with a sharper scope whether you hire us or not.

Budget
Timeline

Typically answered the same working day

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