From idea to a working SaaS product in four to eight weeks, planned, designed and built by two engineers with 5+ years of production experience. You own the code from day one.
Real screens from Kryptos, the crypto tax and portfolio SaaS we've spent years building
5+
Years shipping production software
40,000+
People using a SaaS we helped build
50+
Third party integrations built and maintained
35+
Countries' financial data flowing through pipelines we built
Who's actually building it?
We do. We're two engineers who've been shipping production software since 2019, and we're the only two people you'll work with 👇
Shivanshu Pathak
Cloud, security and DevOps · Shipping since 2019
Shivanshu builds the multi-tenant backends, data pipelines and cloud infrastructure a SaaS runs on, with security designed in from the start. Before Kryptos, Shivanshu built trading platforms at BW Labs, DeFi services at Mantle and a collaborative SaaS at Legora.
Divyyesh Chandra
Backend, integrations and AI · Shipping since 2022
Divyyesh builds the hard parts of financial software, like large third party integrations, event-driven pipelines and data systems that stay accurate at millions of records. Alongside that, Divyyesh designs and ships independent AI and real-time products, end to end.
Where the experience comes from. Two careers, one story, starting in 2019.
2019
Legora
Collaborative SaaS
Real-time document editing, secure authentication and rate limiting, with backend APIs and analytics pipelines on AWS.
ShivanshuIngestion latency cut in half2020
Mantle
DeFi platform
Cloud-native platform services in TypeScript, Node.js and GraphQL, built with the security team around auth and infrastructure as code.
ShivanshuGraphQL API 60% faster2021
BW Labs
Trading systems
Backend platforms for financial trading built on event sourcing and audit trails, with real-time analytics on TimescaleDB, Redis and BullMQ.
ShivanshuIdempotent transaction processing2022
DFrame
Data startup
The Reward Engine end to end, from Kafka and MongoDB pipelines to the React app, the KYC and referral APIs and the reward contracts.
DivyyeshOwned it through to production2023
Kryptos
Crypto tax SaaS, 40,000+ users
50+ integrations, event-driven pipelines on GCP, multi-tenant PostgreSQL with SOC 2 aligned controls, and AWS infrastructure written in Terraform.
Shivanshu and DivyyeshPlatform uptime up 15%Now
Nexussstudio
Our studio
Everything above, pointed at your product. We plan, design and build SaaS MVPs, online stores and websites for founders.
Shivanshu and DivyyeshYour MVP could be nextHave they built a real SaaS?
Yes. We've both spent years building Kryptos, a crypto tax and portfolio SaaS used by 40,000+ people in 35+ countries. These are real screens from it 👇
Plug in every exchange and wallet
This is where people connect their accounts. Behind this list sit the 50+ integrations we built, syncing quietly in the background.
Every trade in one list
Deposits, rewards and trades from every connected account end up here, cleaned up, priced and ready for the tax report.
Works properly on a phone
The whole app works on mobile, not a cut down version of it. The portfolio, the tax tools and the reports are all there.
On desktop
Where the numbers have to be right
Every row here comes in through the integrations and pipelines we built. If one number is wrong, it ends up in someone's tax report. That's the standard we hold every system to, including yours.
Divyyesh50+ integrations, one schema
We owned the layer that connects 50+ exchanges, platforms and blockchains, and a normalisation layer that turns every source into one clean schema.
DivyyeshEvent-driven pipelines
An event-driven backend on Google Cloud Pub/Sub and Cloud Tasks, with automated anomaly detection running across millions of records.
ShivanshuMulti-tenant and secure
Multi-tenant modules with PostgreSQL row-level security and audit controls aligned with SOC 2, so one customer never sees another's data.
ShivanshuData from 35+ jurisdictions
Automated ingestion pipelines that pull in financial transaction data from more than 35 jurisdictions and keep it consistent.
Divyyesh
Firebase to PostgreSQL
We led the move from Firebase to a Turborepo monorepo on PostgreSQL, shipped through zero-downtime CI/CD on Docker, GitHub Actions and Cloud Run.
ShivanshuUptime up 15%
Cloud deployments on AWS written as Terraform, plus automated failover, observability and monitoring that lifted platform uptime by 15%.
How will you build my MVP?
The same way we build production software. We plan it, design the system, design the screens, then build, test and launch it 👇
A typical eight week MVP
Shorter scopes finish in four
Plan
System design (HLD)
Detailed design (LLD)
UI design
Build
Test
Launch
Demo
Plan
We start with your users, not the tech. On the first calls we write the user stories, cut the idea down to a first version and agree the milestones.
You get Scope and fixed quote
System design (HLD)
We draw the whole system before writing any code, including the services you need, how data moves, which cloud it runs on and which third parties plug in.
You get Architecture diagram
Detailed design (LLD)
Then we go a level deeper into the database schema, the API contracts, roles and permissions, and the edge cases that usually only show up in production.
You get Schema and API spec
UI design
We design the key flows in Figma and turn them into a clickable prototype, so you can click through the product before it's built.
You get Figma prototype
Build
We build in two week sprints and show you working software at the end of each one. There's no big reveal at the end and no surprises.
You get A demo every two weeks
Test
Unit, integration and end to end tests run on every change, along with a security review of auth, data access and payments.
You get Tests and security checklist
Launch and hand over
We set up CI/CD, infrastructure as code and monitoring, launch on your domain and hand over the code, the docs and every login.
You get Live product you own
What does the system look like?
Before any code, we draw it. First the high level design, then the low level design. Here's what that looks like for a typical SaaS 👇
High level design
This is the big picture. It shows every service, how they talk to each other and where the data lives.
Clients
Web appNext.jsAdmin panelReactMobile webResponsiveEdge
CDN and WAFCaching and protection
API gatewayAuth checks and rate limitsServices
Core APINode.js or Go
BillingStripeWorkersGo or Python jobsEvents
QueuePub/Sub, SQS or KafkaSchedulerRetries and cron jobsData
PostgreSQLRow-level securityRedisCache and rate limitsFile storageS3 or Cloud StorageAround everything
CI/CDGitHub ActionsInfra as codeTerraformContainersDockerMonitoringLogs, metrics, alertsLow level design
This is where it gets detailed. It covers the tables, the API contracts and the rules that keep your data safe.
Database schema
organizations
id uuid pk
name text
plan text
created_at timestamptz
users
id uuid pk
org_id uuid fk
email citext unique
role owner | admin | member
subscriptions
id uuid pk
org_id uuid fk
stripe_id text
status active | past_due
audit_logs
id bigint pk
org_id uuid fk
actor_id uuid fk
action text
users, subscriptions and audit_logs all belong to one organization
// API contract, agreed before we build
POST /v1/projects
Authorization: Bearer <token>
Idempotency-Key: 7c1e…
{ "name": "Q3 launch" }
201 Created
{ "id": "prj_8f2k", "orgId": "org_12" }
✓Row-level security on every tenant table
✓Idempotency keys on payments and webhooks
✓Rate limits per user and per organisation
✓Every change written to the audit log
This is an example. Yours gets drawn around your product in the first week, and you get to keep it.
What do you build with?
We use tools we've run in production for years, not ones we picked up for this page 👇
Cloud and DevOps
AWSGoogle CloudTerraformDockerGitHub ActionsGitHubBackend
Node.jsTypeScriptGoPython
ExpressGraphQLData
PostgreSQLRedisKafkaMongoDB
Supabase
FirebaseProduct
Next.jsReactTailwind CSSFigmaStripe
VercelWhat goes into it?
Everything a first version of a SaaS needs, built properly the first time 👇
The core product
The dashboards and flows your users came for, designed and built together so they feel like one product.
Active users
2,418
MRR
£8.2k
Churn
1.9%
Sample data
Sign up and accounts
Email, Google and Apple sign in, with sessions and password resets handled properly.
Create your account
Billing from day one
Plans, trials and subscriptions through Stripe, so you can charge your first customer.
Plans
MonthlyYearlyStarter
£19/mo
Pro
£49/mo
Payments, trials and invoices through StripeTeams and roles
Invite teammates, set roles and keep every organisation’s data apart.
Team
InviteEmails and alerts
Welcome emails, receipts and in-app alerts that go out at the right moment.
Plugged into the tools you already use
Payments, cloud storage, analytics and the APIs your product depends on, wired in and tested.
Is this for me?
(01)
Non technical founders
You have the idea and the customers. You need a product people can actually use.
(02)
Founders validating a SaaS
You want paying users on a real product before you raise or hire a team.
(03)
Teams testing a new idea
A focused first version to put in front of users before you hire a full team.
Fixed price per milestone
You know the full cost before we start. No hidden fees.
You own everything
The code, the design and the IP are yours outright. NDA if you want one.
Quick to start
Kickoff usually happens within a week of our first call.
Any questions left?
A focused MVP usually takes four to eight weeks. We'll give you a clearer timeline once we've scoped the first version together.
What else do they do?
Got a SaaS idea?
Let's scope it.
Book a free 30 minute call with both of us. We'll sketch the first version with you and quote a fixed price per milestone.