Senior engineering studio · Novi Sad, Serbia · CET

Software built to hold.

Northkeep is a senior engineering studio building cloud-native products, backends, and AI features for startups and growing teams in the US, UK, and EU. The engineers you meet on the first call are the engineers who ship your product.

Book a 20-minute intro call See packages
  • .NET
  • TypeScript
  • Azure
  • AWS
  • Next.js
  • LLM integration

8+ years average engineering experience, seniors only

Azure certified Solutions Architect Expert, AWS production experience

100% IP assignment and NDA on every engagement

What we build

Five things, done properly

Custom software development

Web applications, backends, and APIs in .NET and TypeScript. Architected for the team that maintains it after us.

Full-stack product builds

Next.js and React frontends on .NET or serverless backends. From validated idea to production MVP in 8 to 10 weeks.

AI and LLM integration

LLM-powered features, AI agents, and document and vision pipelines. Built on Claude and open-source models, with the accuracy and privacy trade-offs documented, not hidden.

Cloud architecture and DevOps

Azure and AWS, Terraform infrastructure as code, CI/CD, monitoring, and cloud cost optimization.

E-commerce and marketplace engineering

Checkout flows, payment and messaging integrations, PWA support, and the SEO plumbing that makes storefronts findable.

Packages

End-to-end Projects are our Bread and Butter

One senior team takes your product from first architecture call to production, at a fixed price agreed before the build starts. No juniors, no bait-and-switch, no discovery-call pricing theater. Everything we ship is AI-augmented with human architecture decisions and human code review.

End-to-end product build

Custom Quote - Fixed Pricequoted in Sprint Zero

For a new app or service that needs to exist, start to finish.

  • Architecture, build, launch, documented handover
  • Production MVP typically in 8 to 12 weeks
  • Weekly demos, written status, code access from day one
  • Full NDA + 100% IP assignment
Start with Sprint Zero

AI Implementation

Custom Quote - Fixed Pricequoted in Sprint Zero

For a platform that works today and should be smarter tomorrow.

  • LLM features, agents, document and vision pipelines
  • Built on Claude or open-source models, your call
  • Accuracy and privacy trade-offs documented, not hidden
  • Fits your existing stack, auth, and cloud
  • Full NDA + 100% IP assignment
Start with Sprint Zero

Or if you prefer monthly: senior squads, priced in the open

Solo Senior

$7,900/mo

For founders who need one excellent engineer, not a committee.

  • 1 senior full-stack engineer (8+ yrs)
  • Weekly demo call in your timezone
  • CI/CD pipeline setup included
  • Client success lead, weekly written status
  • Full NDA + 100% IP assignment
Book a call
Most common

Duo + Lead

$14,900/mo

For products moving from MVP to paying customers.

  • 2 senior engineers, full-stack + backend/cloud
  • Tech lead: architecture decisions, review on every PR
  • Automated tests + QA every sprint
  • Terraform infrastructure as code
  • Daily async updates, bi-weekly demos
  • Next-business-day support response
Book a call

Full Squad

$24,500/mo

A complete product engineering team, minus the enterprise overhead.

  • 3 senior engineers + tech lead + part-time QA
  • Full DevOps ownership: monitoring, alerting, cost optimization
  • Monthly architecture reviews, quarterly security review
  • Same-day critical issue response
  • Quarterly roadmap and business review
Book a call

Shipped

Recent builds

Giftuj, voucher gifting platform

A public e-commerce platform with accountless checkout and SMS/WhatsApp voucher delivery.

Live in production with PWA support and CI-gated Lighthouse scores.

Next.js.NET 8MongoDBVonage

Sniffer, platform for dog breeders

A full-stack matching and management platform on a near-zero idle-cost serverless stack.

Per-branch preview deployments on every pull request.

AWS Lambda.NET 8ReactReact Native

AI handwriting digitization

A local-first tool that reads handwritten Cyrillic order sheets with a vision-language model and a human review UI.

Privacy versus accuracy is a configuration switch, not a rebuild.

PythonOpenCVVLMClaude APIDocker

How engagements run

Four steps, no mystery

  1. Intro call, 20 minutes

    You describe the product, we tell you honestly whether we are the right fit.

  2. Sprint Zero or direct start

    New builds usually begin with a two-week discovery. Existing codebases start with a review.

  3. Weekly shipping rhythm

    Demos, written status, and code you can inspect from day one.

  4. Handover or long-term

    Documented handover if you are building an internal team, or an ongoing squad if you are not.

Questions

Asked often, answered straight

Who actually writes the code?

Our senior engineers. We do not subcontract and we do not swap in juniors after the contract is signed.

What does AI-augmented mean?

Our engineers use tools like Claude Code to move faster on implementation. Architecture decisions, code review, and accountability stay human. You get senior-quality output at higher speed, not generated code shipped unread.

Who owns the code?

You do. Every engagement includes an NDA and 100% IP assignment, in the contract, not in a promise.

What timezones do you cover?

We are based in CET. That is a full working-day overlap with the UK and EU, and overlap until early afternoon US Eastern. Demos are scheduled in your timezone.

Can you take over an existing codebase?

Yes. We start with a paid review (usually inside Sprint Zero) so both sides know the real state of the code before committing to a squad.

What if it is not working out?

Squad engagements are monthly. Thirty days notice, documented handover, no lock-in.

Tell us what you are building.

A 20-minute call. If we are not the right fit, we will say so and point you somewhere better.

Prefer to talk?

Pick a slot that suits your timezone. No preparation needed, bring the idea as it is.

Book a call

Working hours overlap: full UK day · US East Coast full day