Design before code
Every project starts with low-fidelity mockups, then high-fidelity UX in Figma — so you see and shape the product before a single line of code is written.
Build · Harden · Run — Web & Mobile, US · Europe · Australia
We build web and mobile apps — and take them to production
Building an app is faster than ever. Making it reliable, secure, scalable and compliant is still engineering work. We do both: new web and mobile products in Next.js, NestJS, Laravel and Flutter, and the security hardening, AWS infrastructure and SOC 2-ready operations that keep them running for clients in the US, Spain and Sweden — including apps first built with AI tools.
Rather not book a call? Send your project details or email hello@nxtgenitpark.com — we reply within one business day.
In production today — built, shipped, and operated by NextGen
- Door2DayHome services marketplace · Spain & Sweden
- US Healthcare PlatformRounds & compliance operations · USA
- Flutter · Swift · KotlinMobile engineering
- Next.js · NestJS · LaravelWeb platforms
- AWS · Stripe ConnectInfrastructure & payments
How We Work
From first mockup to production — and beyond launch
Faster with AI, accountable without it
We use AI tools to build faster, and we are open about it. What you pay for is judgment: architecture, security, data integrity and a senior engineer who owns the result. Every production change ships with a written plan, tests, and a rehearsed way to roll it back.
We run what we ship
Launch day isn't the finish line. We operate production systems on AWS — database migrations, monitoring, incident response, and security hardening — which is why our client relationships run for years, not sprints.
About NextGen
The team for the part after “it works on my machine”
12+Years leading production engineering
3Zero-downtime database upgrades
2Countries live on one marketplace
3Languages in production
Anyone can get an app built today — in-house, by a freelancer, or with AI tools. Fewer teams can make it hold up under real users, real data and a security review. NextGen does both: we build web and mobile products end to end, and we take existing ones to production. We run this today for a US healthcare platform and a two-country marketplace in Spain and Sweden, and we're building our own work-order product for US property-preservation vendors.
- Senior-led. The founder, with 12+ years in production engineering, leads every engagement.
- Written before it starts. Scope, price and milestones are agreed in writing; anything new is quoted before it is worked.
- Yours to keep. Code, infrastructure and documentation are assigned to you on payment.
We overlap 3–4 hours a day with Central European and US Eastern time and a full afternoon with Sydney and Melbourne, and work as your delivery team or as a white-label partner behind US, European and Australian agencies.
Our Team
What our team brings
| Area | What we bring | Proven on |
|---|---|---|
| Backend & web | Node.js / NestJS, Laravel / PHP, Next.js / React, PostgreSQL and MySQL | Door2Day marketplace; US healthcare rounds platform |
| Mobile | Flutter cross-platform, native iOS (Swift) and Android (Kotlin), SDK development, App Store and Play Store delivery | Door2Day customer and provider apps |
| Cloud & DevOps | AWS (EC2, RDS, Lambda, CloudWatch, Systems Manager), Ubuntu, Docker and Kubernetes, CI/CD pipelines, monitoring and incident response | Zero-downtime RDS MySQL 8.0 → 8.4 upgrades in production |
| Security & compliance | IAM least-privilege, network hardening, SSL automation, audit-ready infrastructure for SOC 2 programs and GDPR | US healthcare platform's compliance remediation |
| Payments & marketplaces | Stripe Connect in production (provider onboarding, EU KYC, multi-country payouts, refunds and disputes); other payment gateways on request | Door2Day in Spain and Sweden |
| Product design | Figma wireframes to high-fidelity prototypes, multi-language localization | Door2Day in Spanish, Swedish and English |
| Working model | Senior-led delivery (12+ years of production experience), 3–4 hours of daily overlap with CET and US Eastern, a full afternoon with Sydney and Melbourne, written English, white-label available | Long-running client engagements in the US and Europe |
Need to know exactly who will work on your project? We share team profiles and experience with prospective clients on request, under NDA if you prefer.
Request team profiles
Who you'll be working with
Muhammed Saifur RahmanFounder & Lead Engineer
I lead every engagement personally. Twelve years of building and running backend systems, mobile apps and AWS infrastructure. On the platforms we run today I was the architect, took them to production, and still maintain them — for clients in the US and Europe who need the part after "it works on my machine".
Based in Bangladesh · 3–4 hours of daily overlap with US Eastern and CET · a full afternoon with Sydney
Services & pricing
What we do, and what it costs
New builds are quoted against a written scope and split into milestones you can see and test. If you already have an app, five fixed-price checks let you start without a discovery call. Anything outside the written scope is quoted before, never invoiced after.
What we build
Fixed price against a written scope · from $5,000 · from $40/hour, senior-led, where a scope cannot be fixedMobile App Development
An app your customers download from the App Store and Google Play, built and kept running by the same team.
End-to-end delivery of Flutter cross-platform and native iOS (Swift) and Android (Kotlin) apps, from concept through App Store and Play Store release.
Prototype $6,000 – $10,000 · 2–3 weeks Store-ready app $18,000 – $40,000 · 4–8 weeks
Web & SaaS Development
A web app or SaaS product your customers sign in to and pay for, built to keep working as you grow.
Production web platforms built on Next.js, NestJS and Laravel — marketplaces, SaaS products and internal tools that scale with your business.
Prototype $6,000 – $10,000 · 2–3 weeks Production MVP $20,000 – $40,000 · 4–8 weeks
Cloud Infrastructure & DevOps
We make sure your app stays online, stays fast and doesn't cost more to host than it should.
AWS architecture and day-to-day operations: zero-downtime migrations, monitoring and alerting, cost control, and incident response for systems that cannot afford downtime.
Typically $8,000 – $25,000 · 3–6 weeks
Payments & Marketplaces
Take payments and pay out to sellers or providers in several countries, without the surprises that only show up once real money moves.
Payment integrations done properly — Stripe Connect in production in Spain and Sweden (provider onboarding, EU KYC, multi-country payouts), and other payment gateways on request.
Typically $8,000 – $20,000 · 4–8 weeks
Security & Compliance Engineering
Get through a customer's security review or a SOC 2 audit without stalling the deal, and keep your users' data safe.
IAM least privilege, network hardening, SSL automation and audit-ready AWS infrastructure for healthcare companies and teams working toward SOC 2 or operating under GDPR.
Typically $2,000 – $4,000 to start
UI/UX & Product Design
See and click through your product before anything is built, so you change your mind on screens, not in code.
Low-fidelity wireframes through to high-fidelity Figma prototypes, localised for multiple languages and markets before development begins.
Typically $4,000 – $12,000 · 2–4 weeks
Working in a stack you don't see here? Ask — these are the tools we use every day, not a hard limit, and if we are not the right team for it we will say so.
Need people, not a project? Get a dedicated team
Full-time engineers who work only on your product, directed by you and led by a senior tech lead. Custom pricing, typically from $2,500 per engineer per month — written proposal within one business day.
Already have an app? Start with a fixed-price check
Fixed price, fixed scope · no discovery call neededProduction-Readiness Audit
Written report, ranked fix list, 60-min walkthroughAWS Cost & Security Audit
Prioritised fix list: exposure and waste, ranked by risk and monthly costSOC 2 Remediation Sprint
Findings closed, evidence pack for your auditorZero-Downtime Database Upgrade
Runbook, rehearsed rollback, 48h post-cutover monitoringDevOps Retainer
Named senior lead, PR review on every change, monthly reportCase Studies
Real platforms we build and operate today
Marketplace · EU
Client IndustryHome Services — Spain & Sweden
StackNext.js · NestJS · Flutter · PostgreSQL
About
A two-sided home services marketplace operating in Spain and Sweden. We deliver the web platform, the customer and provider mobile apps, Stripe Connect payments with provider KYC onboarding, and full localization across Spanish, Swedish, and English — and we operate it in production.
Read the full Door2Day case study →Healthcare · USA
Client IndustryHealthcare — United States
StackLaravel · MySQL · AWS
About
A HIPAA-compliant healthcare rounds platform serving US care teams (client name withheld under NDA). Beyond feature development, we own the AWS infrastructure: zero-downtime Blue/Green database upgrades, monitoring and alerting, and continuous security hardening in support of the client's compliance program.
Read the full US Healthcare Platform case study →Get in Touch
Start with a small, low-risk engagement
Most clients start with a 2–4 week paid pilot — a scoped feature, migration, or audit — before committing to more. We keep 3–4 hours of daily overlap with CET and US Eastern hours, a full afternoon with Sydney and Melbourne, and reply within one business day.
Remote-first team
Chattogram & Dhaka, Bangladesh
Send your requirements, a spec or files — no call needed. We reply within one business day.
Prefer to talk?
Book a 20-minute call — pick a time that suits you, no form needed.