BKJ Labs · Front-end modernization for enterprise SaaS.
I modernize enterprise SaaS front-ends — without breaking what already works.
14 years inside Salesforce, Gainsight, and Pegasystems. I migrated an 8-year-old Backbone app to Angular for 16,000 daily users with zero parity gaps, and cut Salesforce Experience Sites bundles by 40%. I now do that work for a small number of clients each year.
Booking new engagements from March 2026 · Taking on two projects this quarter.
14 years shipping inside
14+
Years in enterprise front-end
16K
Daily users migrated, zero parity gaps
40%
Bundle size cut at Salesforce
$3M
Deal unblocked by shipped features
Services
Four things I do well, for teams running production software that people depend on.
Legacy Front-End Migration
Move an aging Backbone, jQuery, AngularJS, or early-React codebase onto a modern stack incrementally — shipping the whole way, with no feature freeze and no parity gaps.
Deliverables
- Migration strategy & risk assessment
- Incremental strangler-fig rollout
- Parity test coverage
- Team enablement
Ideal for: SaaS platforms carrying 5+ years of front-end debt
Performance Engineering
Find out why your app is slow, then fix it — bundle composition, SSR and hydration cost, render waterfalls, and Core Web Vitals that actually move.
Deliverables
- Bundle & runtime audit
- SSR / hydration optimization
- Prioritized fix roadmap
- Before-and-after measurement
Ideal for: Teams whose app got slow as it grew
Fractional Front-End Lead
Senior front-end direction without a senior front-end headcount — architecture decisions, code standards, review discipline, and mentoring for a team that's grown past its guardrails.
Deliverables
- Architecture review & decision records
- Code standards and review process
- Hands-on mentoring
- Hiring and technical interview support
Ideal for: Scale-ups without a front-end architect
Product Engineering (0→1)
Take a product from idea to production — design system, application, tests, CI, and deployment. The products below were all built this way, solo.
Deliverables
- Next.js / React application
- Design system & accessible UI
- Test suite and CI pipeline
- Production deployment
Ideal for: Founders who need a senior engineer, not an agency
Work
Enterprise engagements with measured outcomes, and products I designed, built, tested, and shipped alone.
Products I've shipped solo
Every one of these is live, and you can use it right now without signing up. They exist so you can judge how I build before you hire me — not just read about it.
Live Product
Finance Net Worth Dashboard
Local-first personal finance, built to production standard
A wizard-driven net worth dashboard with India-native asset modelling — EPF, PPF, FD compounding, gold by weight at live rates, and mutual funds by scheme. All data stays in the browser; nothing touches a server.
Live Product
JSON Forge
Developer utilities for JSON workflows
Eight tools to compare, merge, validate, format, and convert JSON between YAML, XML, and CSV. Every operation runs client-side — data never leaves the browser.
Live Product
Everyday Tools
Sixteen utilities, no sign-up
A fast, accessible toolkit spanning OCR, image conversion, hashing, JWT decoding, and financial calculators — organized so people find the one they need in seconds.
Enterprise case studies
Two projects that show the pattern: high-stakes systems, real users, measured results, nothing broken on the way.
Case Study
Backbone → Angular Migration
16,000 daily users, zero parity gaps
Gainsight's Cockpit was an 8-year-old Backbone application at the centre of the product. I led the architecture and the team through an incremental migration to Angular — shipped continuously, without a feature freeze, and without a single parity regression reaching customers.
Architecture and delivery lead · ~16K daily active users
Case Study
Experience Sites Performance
40% smaller bundles at Salesforce scale
Salesforce Experience Sites shipped duplicated code and unnecessary assets through its SSR pipeline. I restructured how the pipeline composed and served bundles, cutting bundle size by 40% across customer-facing sites.
40% bundle reduction on a platform serving enterprise customers
How we can work together
Three ways in, priced up front so you can decide whether to talk to me without booking a call to find out.
Architecture & Performance Audit
Fixed fee · 1–2 weeks
From $2,500
A written, prioritized assessment of your front-end: what's slow, what's risky, what to do first, and what it will cost.
- Codebase and bundle analysis
- Prioritized findings with effort estimates
- Written report and walkthrough call
- Fully credited against a follow-on project
Most common
Migration or Build Engagement
Fixed scope · 6–12 weeks
From $12,000
Hands-on delivery of a defined outcome — a migration, a rebuild, or a new product — with weekly demos and no timesheets.
- Scoped milestones agreed up front
- Weekly demo and written progress note
- Production-ready, tested, documented code
- Handover and knowledge transfer
Fractional Front-End Lead
Monthly retainer · 3-month minimum
From $4,000/mo
Ongoing senior front-end direction for your team — architecture, standards, reviews, and mentoring.
- Agreed hours per week
- Architecture decisions and reviews
- Team mentoring and pairing
- Async availability for your team
Not sure which fits? Most engagements start with the audit — it's the cheapest way to find out whether the rest is worth doing, and the fee comes off the project if you continue.
Start with an auditExperience
Fourteen years inside the enterprise SaaS platforms my clients are usually trying to integrate with, migrate off, or scale.
Salesforce
Building and scaling Experience Sites — customer-facing digital experiences on the world's largest CRM platform.
May 2021 – Present
Hyderabad, India
- 40% bundle size reduction on Experience Sites via SSR pipeline optimization.
- Enabled Experience Sites on Managed Runtime.
- Built a webview-to-native JavaScript bridge for mobile app integrations.
Gainsight
Grew from Senior Frontend Engineer to Lead, owning the UI layer of a customer success platform used globally.
Aug 2016 – May 2021
Hyderabad, India
- Led the 8-year Backbone → Angular migration for ~16,000 daily users.
- Shipped features that contributed to closing a $3M deal within a month.
- Designed the Angular architecture and mentored junior developers.
Pegasystems
Built enterprise web applications — the foundation of a 14-year engineering career.
Jul 2012 – Jun 2016
Hyderabad, India
- Delivered scalable front-end solutions in enterprise product development.
- Employee Achievement Award and six Spot Awards.
Recognition: 12+ spot awards across three companies, an Employee Achievement Award at Pegasystems, and a $3M deal contribution at Gainsight.
About
Bhavesh Kumar — Front-End Engineering Consultant, Hyderabad, India · working with teams worldwide.
Most front-end problems at enterprise scale aren't really front-end problems. They're risk problems. The codebase works, thousands of people depend on it daily, and nobody wants to be the one who breaks it — so it quietly gets slower and harder to hire for until a rewrite feels inevitable.
I've spent 14 years on the other side of that decision. At Gainsight I led an 8-year-old Backbone application through a full Angular migration serving roughly 16,000 daily users, shipped incrementally, with zero parity gaps. At Salesforce I restructured the Experience Sites SSR pipeline and cut bundle size by 40%. At Pegasystems I built enterprise applications from the ground up.
I work with a small number of clients at a time, hands-on, end to end: architecture, implementation, performance, and the knowledge transfer that lets your team own the result. If you want to see how I build when nobody is watching, the products below are mine — designed, built, tested, and shipped solo.
How I work
Scoping call
Twenty minutes on your actual problem, your constraints, and whether I'm the right person. If I'm not, I'll say so.
Written proposal
Scope, milestones, price, and what success looks like — in writing, before any code. You can take it to someone else.
Ship weekly
Working software every week, with a demo and a written note. No status theatre, no surprise at the end.
Hand over
Documented, tested code plus the knowledge transfer your team needs to own it without me.
Why work with me
You get the senior engineer
No account manager, no handoff to a junior after the sales call. The person who scopes your project is the person who writes the code.
Enterprise rigor, no bureaucracy
14 years shipping inside Salesforce, Gainsight, and Pega — applied at the speed of a team of one. Tests, CI, and documentation come standard, not as an upsell.
Fixed scope, not timesheets
We agree the outcome and the price before work starts. You know what you're getting and what it costs; I carry the estimation risk.
Tell me what's broken.
A slow app, a migration nobody wants to start, a team without senior front-end direction. Send me the details and I'll tell you honestly whether I can help — and if I can't, who might.