# Senior full stack developers for US teams | Miyagami > Hire senior full stack developers for US teams, full-time from €5,760 a month and assessed with AI tools off and on. Shortlist in 3 working days. Source: https://www.miyagami.com/hire/full-stack-engineers [Home](https://www.miyagami.com/)/ [Hire engineers](https://www.miyagami.com/hire)/ Full-stack engineers # Hire senior full-stack engineers Senior full-stack engineers own a feature from ticket to production across the browser, the API and the database, without a handover. In our vetting they trace a schema change through an API contract and into UI state, and they have to spot a model suggestion that fixes one layer and quietly breaks another. [Get a shortlist](https://www.miyagami.com/shortlist?role=full-stack-engineers) What we test for How AI changed this role 01 ### AI made breadth cheap AI tools can now produce a passable frontend and a passable API in an afternoon, so breadth alone no longer sets an engineer apart. The real work sits in the seams between layers: data contracts, caching, auth and migrations. 02 ### Data contracts are harder to generate than code AI tools produce plausible output at each layer, and that's the problem: a fix at one layer can quietly break the contract at another. A full-stack engineer who understands those contracts is worth more than one who can ship each layer in isolation. 03 ### The value is in knowing where things connect A schema change that ripples into an API response and breaks a UI state sits across all three layers at once. That's what a full-stack engineer is now hired to own. What we test for ## How we assess full-stack engineers Every engineer works through a fundamentals assessment with AI tools switched off and a second assessment with their own agents running. For full-stack engineers, these criteria carry the most weight. AI output verification : The engineer must catch a model suggestion that fixes the API contract while silently introducing a regression in UI state. Debugging : Tracing a schema change end to end, through the API layer and into a broken screen, requires systematic diagnosis across the full stack without handover. Technical understanding : The engineer needs to reason about why a schema change breaks a UI and articulate the causal chain across all three layers. [See both scorecards](https://www.miyagami.com/how-we-vet) Cost and timeline Hiring with Miyagami From €5,760 a month - One senior engineer, full-time, at a fixed monthly fee - Employment, payroll and compliance included, no recruitment fee [**Against a senior local hire in your country** See the full pricing comparison](https://www.miyagami.com/pricing#calculator) Timeline 5 days to hire - Three-month minimum - Wrong fit: we replace at our cost [**Get a shortlist in 3 days** Request full-stack engineers](https://www.miyagami.com/shortlist?role=full-stack-engineers) Skills in this role [JavaScript developers In the first assessment, they read and fix code they didn't write with AI tools switched off.](https://www.miyagami.com/hire/javascript-developers) [MongoDB developers Each one is tested on aggregation pipelines, schema evolution under load, and knowing when MongoDB is the wrong choice.](https://www.miyagami.com/hire/mongodb-developers) [MySQL developers We test them on query optimisation, schema design, indexing strategy, replication, and how they verify AI-generated SQL before it runs.](https://www.miyagami.com/hire/mysql-developers) [Next.js developers Each one is tested on the server/client boundary, where AI models are most often confidently wrong.](https://www.miyagami.com/hire/nextjs-developers) [Node.js developers Each one is assessed on reasoning about a codebase they didn't write and on catching a confident, wrong migration before it ships.](https://www.miyagami.com/hire/nodejs-developers) [PHP and Laravel developers Each one is tested on refactoring quickly without breaking what works, and on reading and verifying AI-generated code before it ships.](https://www.miyagami.com/hire/php-laravel-developers) [React developers Each one is tested on component architecture, state management, accessibility and reading design systems they didn't write.](https://www.miyagami.com/hire/react-developers) [Supabase developers Each one is tested on data modelling, RLS policy design and migration judgement.](https://www.miyagami.com/hire/supabase-developers) [TypeScript developers The assessment checks whether they let types catch what the model missed, as well as whether the code compiles.](https://www.miyagami.com/hire/typescript-developers) Related reading [### How to review AI-generated code Reviewing AI-generated code changes some of what reviewers look for and keeps the rest. This entry covers both, plus the specific failure modes to check for.](https://www.miyagami.com/resources/articles/how-to-review-ai-generated-code)[### How do you test software you didn't design Standard coverage metrics mislead when you test software you didn't design. This entry explains what engineers should do instead when reviewing AI-generated code.](https://www.miyagami.com/resources/articles/testing-software-you-didnt-design)[### What is a coding agent A coding agent is an AI system that writes, edits, runs and debugs code autonomously across multiple steps, without a human directing each action.](https://www.miyagami.com/resources/articles/what-is-a-coding-agent) ## Questions about hiring full-stack engineers How much does it cost to hire a senior full-stack engineer? A senior local hire in the Netherlands costs about €9,000 a month all-in, based on a senior software engineer median salary, statutory employer contributions and an amortised recruitment fee. Through us you pay a fixed monthly fee with employment and compliance included, and the pricing calculator shows the two side by side. How long does it take to hire a full-stack engineer? You get a shortlist within three working days and can hire within five. A local senior hire in the Netherlands typically takes 4 months. What do you test a full-stack engineer on? Every full-stack engineer completes both assessments. They also trace a schema change end to end as it ripples into an API contract and a UI state, including a model suggestion that fixes one layer and quietly breaks another. Other roles [AI-native engineers An AI-native engineer works at the application layer and uses AI tools as a core part of how they build. TypeScript React / Next.js Node.js / NestJS](https://www.miyagami.com/hire/ai-native-engineers) [Backend engineers A backend engineer builds and runs the services, data models and integrations a product depends on. Node.js / NestJS Python / FastAPI Go](https://www.miyagami.com/hire/backend-engineers) [Frontend engineers A frontend engineer builds what users actually touch: interfaces, state, performance and accessibility. TypeScript React / Next.js Vue](https://www.miyagami.com/hire/frontend-engineers) [Mobile engineers A mobile engineer builds and ships iOS and Android apps, either cross-platform or native, and owns the parts web teams rarely think about: offline state, app store releases, device fragmentation and battery. React Native Flutter iOS](https://www.miyagami.com/hire/mobile-engineers) [DevOps engineers A DevOps engineer builds and runs the infrastructure, pipelines and observability that let a team ship safely and often. AWS GCP / Azure Terraform](https://www.miyagami.com/hire/devops-engineers) [Systems engineers A systems engineer builds the low-level software other code depends on: services where latency and memory matter, concurrency, networking, embedded and Linux-level work. Rust C++ C](https://www.miyagami.com/hire/systems-engineers) [QA engineers A QA engineer makes sure what ships does what it should: test strategy, automation, exploratory testing and the release checks that stop a regression reaching users. Playwright Cypress Jest / Vitest](https://www.miyagami.com/hire/qa-engineers) [Data engineers A data engineer builds the pipelines, warehouses and models that move data from where it's produced to where it's used, reliably and on time. Python SQL dbt](https://www.miyagami.com/hire/data-engineers) [AI engineers An AI engineer works at the model layer: retrieval pipelines, evaluation, fine-tuning, serving and the guardrails around them. Python PyTorch LangChain / LlamaIndex](https://www.miyagami.com/hire/ai-engineers) Full-stack engineers by market: [Netherlands](https://www.miyagami.com/hire/full-stack-engineers/netherlands), [United Kingdom](https://www.miyagami.com/hire/full-stack-engineers/united-kingdom), [Germany](https://www.miyagami.com/hire/full-stack-engineers/germany), [Sweden](https://www.miyagami.com/hire/full-stack-engineers/sweden), [Belgium](https://www.miyagami.com/hire/full-stack-engineers/belgium), [Ireland](https://www.miyagami.com/hire/full-stack-engineers/ireland), [France](https://www.miyagami.com/hire/full-stack-engineers/france), [Denmark](https://www.miyagami.com/hire/full-stack-engineers/denmark), [Switzerland](https://www.miyagami.com/hire/full-stack-engineers/switzerland), [United States](https://www.miyagami.com/hire/full-stack-engineers/united-states), [Canada](https://www.miyagami.com/hire/full-stack-engineers/canada), [Australia](https://www.miyagami.com/hire/full-stack-engineers/australia) Let's talk ## Get a shortlist within three days You share the roles and the stack in a short form or a thirty-minute call. Within three working days you get named senior engineers to review, each with both scorecards, and you can hire within five. [Get a shortlist](https://www.miyagami.com/shortlist) Reviewed on **Clutch** 39 reviews [ISO 27001 Certified](https://trust.miyagami.com/) Book thirty minutes with Dale The calendar is provided by HubSpot, which sets its own cookies. Load it here, or book on HubSpot's page. [Open booking page](https://sales.miyagami.com/meetings/dwesdorp)