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App Modernization

Modernise legacy stacks without standing still

Strangler-fig rewrites, cloud lifts, API facades and UI refresh on live traffic — measure cutovers in minutes, not weekends, with dual-write paths and observability from day one.

  • .NET / Java / PHP / monoliths → services or Node edges without big-bang rewrites
  • Database replatforms · CDC · backfills with checksums and replayable queues
  • Next.js / React shells on existing APIs · design tokens · accessibility hardening
  • From ₹1,25,000 discovery + migration runway · fixed milestones
Get a Free Quote Book a Free Call
★★★★★ 4.9/5 · 120+ legacy systems modernised
15+ countries NDA-protected 2hr response
Trusted by businesses worldwide
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Case Studies

Proven case studies of modernisation

Legacy lifts we’ve run — strangler rewrites, cloud exits and UI refresh — with measurable downtime windows and hours returned to teams.

Healthcare  ·  10-week programme · Mumbai · Node + Postgres

HIPAA-minded FHIR router that cut lab result latency from hours to seconds

The Challenge

CareBridge’s hospital network relied on nightly SFTP drops — clinicians saw stale labs in the EMR, and compliance audits flagged missing provenance on every file.

The Solution

Event-driven FHIR R4 gateway with signed webhooks, idempotent transforms from HL7 v2, dead-letter queues for malformed messages, and immutable audit stream to object storage.

Key Highlights & Features
  • Per-tenant mTLS + rotating service accounts
  • Schema validation with human-readable error surfacing
  • Replay-safe offsets for each feeder hospital
  • On-call runbooks + synthetic probe every 2 min
  • PII minimisation in logs + tokenised patient refs
  • Grafana SLO dashboards for ingest lag
The Impact
-94% lab-to-EMR delay
0 audit findings (12 mo)
99.99% ingest availability
View project brief Build something similar
Hire AI Engineers

Rent battle-tested AI engineers — without the hiring chaos

Skip 90-day hiring cycles. Get a Coderlab AI engineer (or full pod) onboarded in 48 hours — billed by the hour, week, or month. Pause, swap or scale anytime.

0h avg. onboarding time
0+ AI engineers on bench
0% client retention
₹0 to start · 1-week trial
Hourly

By the hour

Best for short tasks, hot fixes, prototypes & spec’d-out features. No commitment — bill weekly.

  • Min. 10 hours / week
  • Hourly time-tracking + screenshots
  • Pause / resume anytime
  • Weekly invoicing in INR or USD
Match me with an engineer
Monthly Dedicated ★ Most Popular

Full-time dedicated

One AI engineer working only on your roadmap. Daily standups, your tools, your time-zone.

  • 160 hrs / month · 8 hrs/day
  • Direct Slack / Notion / GitHub access
  • Daily standups + weekly demos
  • Free 1-week trial · pay only after
Start 1-week trial
AI Pod

Full AI pod (3-5)

PM + LLM eng + RAG architect + ML Ops + QA. End-to-end product team that ships in weeks, not quarters.

  • 3-5 dedicated engineers
  • PM-led delivery + sprint demos
  • SLA-backed uptime + on-call rotation
  • Full IP & source-code transfer
Build my pod
Why Coderlab

Why teams hire AI engineers through us

48-hour onboarding

Send a brief on Monday. Have an engineer pushing PRs by Wednesday. No quarter-long hiring loops.

AI specialists, not generalists

Every engineer ships LLM, RAG, vector-DB or agent code daily. We don’t send web devs in disguise.

Try before you commit

1-week paid trial — but you only pay if you keep the engineer. Risk sits with us, not you.

End-to-end ownership

One accountable engineer for spec, code, deploy & monitoring. No hand-off losses, no finger-pointing.

Roles you can hire

8 specialist profiles, on-the-bench right now

L Available

LLM Engineer

GPT-5 Claude Fine-tuning
Hire
R Available

RAG Architect

Pinecone Weaviate Embeddings
Hire
M Available

ML Ops Engineer

Kubeflow AWS SageMaker CI/CD
Hire
V Available

Voice AI Engineer

ElevenLabs Whisper Sarvam
Hire
C Available

Computer Vision Eng.

YOLO Detectron OpenCV
Hire
P Available

AI Product Engineer

Next.js tRPC Vercel AI SDK
Hire
A Available

Prompt Engineer

CoT DSPy Evals
Hire
D Available

AI Data Engineer

dbt Airflow Spark
Hire
Need an AI engineer next week?

Talk to a Coderlab engineer in 24 hours

Tell us what you’re building. We’ll match you with 2-3 pre-vetted profiles within a working day. ₹0 to start.

Book matching call Send job description
✓ No agency commitment ✓ NDA on first reply ✓ Full IP transfer
Delivery Tracks

8 types of custom software we ship

Pick a lane — we shape the domain model, spike the riskiest integration first, and ship incremental releases behind flags with observability from day one.

Most Popular

Internal platforms & admin consoles

Role-based workflows, audit trails and bulk actions — React/Next, Vue or server-rendered stacks your ops team can actually adopt.

  • RBAC + row-level rules
  • CSV / PDF exports
  • Keyboard-first tables
Ask for Quote
Integrations

ERP / CRM / payment bridges

Idempotent webhooks, compensating transactions and replay tooling when SAP, Zoho or Shopify disagree.

  • Outbox + DLQ
  • Schema registry
  • Backfill jobs
Ask for Quote
Data products

Pipelines, warehouses & ML features

Batch + streaming ingestion, dbt-style transforms and feature stores that don’t leak PII into notebooks.

  • Airflow / Dagster
  • Snowflake / BigQuery
  • Row-level security
Ask for Quote
APIs

Public & partner APIs

Versioned OpenAPI, rate limits, mTLS for B2B and developer portals that stay in sync with the implementation.

  • Contract tests
  • API keys + OAuth2
  • Canary routing
Ask for Quote
Modernisation

Legacy strangler-fig rewrites

Carve bounded contexts out of monoliths with dual-write reconciliation until error budgets stay green.

  • Shadow traffic
  • Parity dashboards
  • Feature flags
Ask for Quote
Regulated

Compliance-minded builds

HIPAA / SOC2 patterns — encryption at rest, immutable audit logs and least-privilege IAM baked into CI.

  • Secrets rotation
  • SIEM hooks
  • Pen-test fixes triaged
Ask for Quote
DevEx

Developer tooling & CI/CD

Preview envs per PR, migration pipelines and golden-path templates so new hires ship on week one.

  • GitHub Actions
  • Terraform modules
  • Local docker-compose
Ask for Quote
Ongoing

Engineering retainers & SRE

On-call rotations, dependency upgrades, cost guardrails and quarterly architecture reviews.

  • SLO dashboards
  • Post-incident reviews
  • Release trains
Ask for Quote
Capabilities

What every Coderlab software build ships with — out of the box

Typed contracts, event-driven sagas, SLOs and on-call routing — so production deploys stay boring (in a good way).

API · Parsing

Typed payloads & validation

JSON Schema / OpenAPI, guardrails on every handler — malformed vendor webhooks never poison core tables.

CI · Gates

Confidence before prod

Contract tests, migration dry-runs and load slices block merges that would breach latency SLOs.

EVENTS · Sagas

Durable workflows

Outbox, idempotent consumers and compensating steps — money-moving flows survive retries and partial failures.

SLO · Budgets

Error budgets & burn alerts

Latency + availability SLOs per service — marketing can’t silently turn a heavy query back on.

OPS · Pager

On-call routing

OpenTelemetry traces → Slack / PagerDuty with service owners — noisy alerts get tuned, not muted.

MESH · Services

Polyglot service graph

Go workers, Node BFFs, Python ML sidecars — one mesh for auth, retries and mTLS between them.

INTEGRATIONS · ERP

Vendor-safe connectors

SAP / Zoho / Shopify adapters with backoff, DLQs and human-readable replay — finance trusts the numbers.

DOCS · ADRs

Runbooks next to code

ADRs, env matrices and rollback scripts versioned with the tag — auditors and new hires read the same truth.

INSIGHTS · SRE

Throughput & cost telemetry

Dashboards on queue lag, DB hot shards and cloud spend — eng and finance agree what “healthy” looks like.

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Complete SEO + performance + accessibility analysis of any URL. Get a detailed PDF with prioritized fixes.

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Chatbot ROI Calculator

Discover how much an AI chatbot will save your business — projected savings, payback period & ROI multiple, in 90 seconds.

₹4.2 Cr+ savings calculated Calculate My ROI 10 questions · 90 seconds · PDF emailed

Tech Stack Recommender

Describe your project. Our AI suggests the optimal stack, ballpark cost, and realistic timeline — instantly.

850+ projects scoped Get My Stack 2 minutes · No card · PDF + Email
Systems We Ship For

Software tuned for your sector

From regulated data hubs to revenue-critical integrations — we ship APIs, workers and consoles with audit trails and SLOs your auditors can read.

Health & wellness

FHIR · HL7 · EMR

Lab routing · consent-aware APIs · audit-ready message stores · patient portal backends

FinTech & NBFC

Ledger · Risk · Payments

Double-entry cores · reconciliation workers · PCI-scoped services · fraud-rule engines

D2C & retail

OMS · WMS · Pricing

Real-time inventory mesh · promo engines · returns RMA APIs · 3PL webhooks

EdTech & creators

LMS · Billing · Content

Cohort provisioning · entitlement APIs · usage metering · DRM-friendly asset delivery

Real estate & PropTech

Listings · CRM · Comms

Lead scoring pipelines · booking APIs · document vaults · broker commission engines

Logistics & mobility

TMS · Fleet · ETA

Trip state machines · rate-shopping APIs · POD ingestion · carrier EDI bridges

Insurance & brokers

FNOL · UW · Policy

Rules engines · document extraction queues · renewal batch jobs · broker commission ledgers

B2B SaaS

Multi-tenant · Billing · Admin

Tenant isolation · usage-based metering · webhook sandboxes · impersonation-safe admin

Our AI-Powered Process

From idea to launch — accelerated 10× by AI

Same proven 5 steps. With AI co-piloting every stage, weeks compress into days — without sacrificing quality.

1

Discovery

AI-assisted requirement gathering & instant competitor analysis

GPT-5 + Claude
1 week 30 min
2

Design

AI-generated wireframes & mockups, refined by senior designers

Figma AI + v0
2 weeks 2 days
3

Development

Vibe coding with Cursor + Claude pair-programming agile sprints

Cursor + Claude
3 months 3 weeks
4

Testing

AI-generated test suites & automated edge-case discovery

Playwright AI
1 week 2 days
5

Launch

One-click AI deploy + AI uptime monitoring & instant rollback

Vercel + Sentry AI
3 days Same day
Total: ~3.5 months → 4 weeks 10× faster Same quality, lower cost
Our Stack

Powered by the world’s best AI & modern dev tools

From frontier AI models to native mobile frameworks — all the tools we use to ship 10× faster.

AI Tools
Web Dev
Mobile Dev

Book a free architecture discovery call — 30 minutes, zero commitment.

Bring your current systems, integrations and success metrics. Leave with a bounded-context sketch, integration risk list and phased roadmap your stakeholders can fund.

Get a Free Quote Book Free Call
Replies in 2 hours NDA-protected No sales spam
Stack & Tooling

Languages + platform glue you can trust

We standardise on boring, proven runtimes — containers, queues and traces — so your team can hire against a stack that won’t age out in six months.

Languages & runtimes

TypeScript / Node Python Go Java / Kotlin C# / .NET Rust (edge cases)

Web & APIs

Next.js NestJS FastAPI gRPC GraphQL OpenAPI

Data & storage

Postgres MySQL MongoDB Redis Snowflake Elasticsearch

Messaging & async

Kafka RabbitMQ NATS SQS Temporal Webhooks

Infra & delivery

Docker Kubernetes Terraform GitHub Actions Argo CD AWS / GCP / Azure

Quality & ops

JUnit / Vitest k6 / Locust OpenTelemetry Grafana Sentry Feature flags
Why Coderlab

Why we are different from other software companies

We’re not the cheapest. Not the oldest. But we’re the smartest choice for businesses that want AI-powered solutions delivered with personal attention at fair prices.

3–5× Faster development

AI-First, From Day One

While traditional IT firms added AI as an afterthought, Coderlab was built from the ground up with AI-first principles. Every project leverages modern tools like Cursor, Claude Code, and GPT-5 — making your software 3-5x faster to build with built-in intelligent features.

7-day MVP delivery standard
40–70% Lower cost vs competitors

Startup-Friendly Pricing

Octal charges $5,000 minimum. Infosys won’t talk under ₹50 lakh. Coderlab solves this. Our projects start from ₹15,000. International MVPs from $500. You get the same technical excellence at 40-70% lower prices than traditional IT firms.

Projects starting from ₹15,000
2hr Average response time

Personal Attention

You work directly with founders and senior team members. Every client gets a dedicated PM, direct WhatsApp line to leadership, and weekly sync calls. We take 20% fewer projects than capacity allows — specifically so every client gets the attention they deserve.

Direct WhatsApp line to founders
15+ Countries served

Gurgaon-Based Quality

Headquartered in Gurgaon — India’s tech capital. Our team combines world-class expertise with local business understanding. For Indian clients, we speak your language. For international clients, we offer IST/GMT/EST overlap and English-fluent management.

IST / GMT / EST timezone overlap
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Testimonials — 200+ Happy Clients

What our clients say

Unfiltered stories from business owners, founders & product leads — across India and 14 other countries.

80% support reduction

“The chatbot integrates seamlessly with our WhatsApp Business and has reduced our support workload by 80%. Would absolutely recommend.”

Dr. Priya Sharma

Owner, Shine Healthcare Clinic · Mumbai, IN

8-day MVP shipped

“Coderlab built our MVP in just 8 days. We raised our seed round 30 days after launch. These guys are the real deal.”

Rajesh Kumar

Founder, FinPath Technologies · Bengaluru, IN

₹8.5L saved

“I was quoted ₹12 lakh by a big firm. Coderlab delivered the same quality CRM for ₹3.5 lakh in half the time. Best decision this year.”

Anjali Desai

COO, Desai Real Estate Group · Pune, IN

6.5× faster loads

“We rebuilt our SaaS dashboard with Coderlab. Load times dropped from 4s to 600ms. Customers literally noticed within a week.”

Ahmed Khan

Founder, DataPulse Analytics · Dubai, AE

+40% pipeline

“Their AI sales agent qualifies leads at 3 AM while we sleep. Pipeline grew 40% in two months — without hiring a single SDR.”

Sneha Iyer

Director, Iyer Realty · Chennai, IN

80% support reduction

“The chatbot integrates seamlessly with our WhatsApp Business and has reduced our support workload by 80%. Would absolutely recommend.”

Dr. Priya Sharma

Owner, Shine Healthcare Clinic · Mumbai, IN

8-day MVP shipped

“Coderlab built our MVP in just 8 days. We raised our seed round 30 days after launch. These guys are the real deal.”

Rajesh Kumar

Founder, FinPath Technologies · Bengaluru, IN

₹8.5L saved

“I was quoted ₹12 lakh by a big firm. Coderlab delivered the same quality CRM for ₹3.5 lakh in half the time. Best decision this year.”

Anjali Desai

COO, Desai Real Estate Group · Pune, IN

6.5× faster loads

“We rebuilt our SaaS dashboard with Coderlab. Load times dropped from 4s to 600ms. Customers literally noticed within a week.”

Ahmed Khan

Founder, DataPulse Analytics · Dubai, AE

+40% pipeline

“Their AI sales agent qualifies leads at 3 AM while we sleep. Pipeline grew 40% in two months — without hiring a single SDR.”

Sneha Iyer

Director, Iyer Realty · Chennai, IN

Hired in 1 day

“I shopped 5 agencies. Coderlab was the only one who shipped working code in the first call. Hired them on the spot.”

Mike Chen

CEO, NexGen Robotics · San Francisco, US

7× faster integration

“Their team integrated Razorpay, Cashfree, and Stripe in 3 days. Other agencies quoted 3 weeks. Their speed is the real superpower.”

Vikram Patel

CTO, Bookmate India · Ahmedabad, IN

Featured on Play Store

“Our mobile app got featured on Play Store within 6 weeks of launch. Coderlab's quality is genuinely European-grade.”

Lisa Müller

Co-founder, MoveFit · Berlin, DE

2-hour response avg

“Founder access on WhatsApp is a game-changer. I message at midnight, I get answers by morning. Try finding that elsewhere.”

Arjun Nair

Owner, Nair Logistics · Kochi, IN

Saved the launch

“We were burning cash on a no-show vendor. Coderlab took over mid-project, fixed all bugs, and shipped on time. Literally saved our launch.”

Tanya Reddy

Product Lead, BloomBox Studios · Hyderabad, IN

Hired in 1 day

“I shopped 5 agencies. Coderlab was the only one who shipped working code in the first call. Hired them on the spot.”

Mike Chen

CEO, NexGen Robotics · San Francisco, US

7× faster integration

“Their team integrated Razorpay, Cashfree, and Stripe in 3 days. Other agencies quoted 3 weeks. Their speed is the real superpower.”

Vikram Patel

CTO, Bookmate India · Ahmedabad, IN

Featured on Play Store

“Our mobile app got featured on Play Store within 6 weeks of launch. Coderlab's quality is genuinely European-grade.”

Lisa Müller

Co-founder, MoveFit · Berlin, DE

2-hour response avg

“Founder access on WhatsApp is a game-changer. I message at midnight, I get answers by morning. Try finding that elsewhere.”

Arjun Nair

Owner, Nair Logistics · Kochi, IN

Saved the launch

“We were burning cash on a no-show vendor. Coderlab took over mid-project, fixed all bugs, and shipped on time. Literally saved our launch.”

Tanya Reddy

Product Lead, BloomBox Studios · Hyderabad, IN

200+ happy clients 4.9 / 5 average rating 98% retention 15+ countries
App Modernization FAQ

Frequently asked engineering questions

What CTOs and product leads ask before we touch production data or wire the first ERP webhook.

How much does a custom software MVP cost?

A focused internal tool or API surface (auth, core workflows, one major integration, basic admin) typically lands ₹2,00,000 – ₹8,00,000. Multi-tenant SaaS, regulated health/finance or heavy data pipelines often start ₹10,00,000+. We quote fixed milestones after a short discovery — no surprise change orders on agreed scope.

When should we build custom vs buy off-the-shelf?

We recommend custom when workflow differentiation, regulated data residency or deep ERP/legacy coupling is the product — not when a mature SaaS already solves 90% cheaply. We’ll tell you honestly if configure-not-code is faster.

How long until the first production release?

Most teams see a usable slice in 4–8 weeks (read APIs, admin screens, observability). Full cutover depends on data migration and parallel-run requirements — we plan strangler phases so you never big-bang a Friday deploy.

Can you deploy on our VPC or on-prem?

Yes — AWS / GCP / Azure accounts you own, private networking, and air-gapped agents where needed. We document every IAM role and rotate credentials after handover.

How do you integrate with messy legacy systems?

We start with read-only shadow traffic, contract tests and compensating transactions. CSV/SFTP bridges are temporary — we replace them with event streams or APIs once parity dashboards stay green.

How do you approach security and compliance?

Threat modelling in week one, least-privilege IAM, encrypted secrets, audit logs and dependency scanning in CI. We align logging/retention to your SOC2 / HIPAA checklist — not checkbox theatre.

What about ongoing maintenance?

We offer monthly engineering retainers — upgrades, on-call, cost reviews and quarterly roadmap sessions — or a clean handoff with runbooks if your internal team absorbs it.

Who owns the source code and IP?

You do — 100%. Repos live in your Git org, infrastructure code in your cloud accounts, and third-party keys stay yours. We use standard OSS licences unless you need something bespoke.