Jest Experts in Hamburg
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Meet FRATCH Experts in Hamburg, who have recently used Jest
Timo J.
Last position:
Co-Founder & Technical Lead at cubular GmbH
Co-founded a software agency building custom web and cross-platform products. I owned the technical decisions across the whole portfolio and led 12 people, while carrying delivery planning, process and client relationships for 11 clients across 3 industries.
Technical leadership: owned the technical decisions for the codebase across every project — stack, architecture, code conventions and the tooling the team worked with — and led the developers on how work got built through code reviews, pair programming and mentoring across a team ranging from junior to senior, keeping the codebase coherent as the portfolio and the team grew
Delivery planning against the financial plan: built the company's financial plan and derived from it the billable hours each developer had to reach per month and the hours each project could absorb to stay within budget; planned capacity and scope against those figures and negotiated budgets and delivery dates directly with clients
Client ownership: technical contact across the portfolio — requirements gathering and prioritisation, scoping and estimates, timeline communication, budget negotiation, and consistent transparency throughout delivery
Team and people: owned the hiring and interview process end to end and took responsibility for offboarding where it was needed; designed an onboarding that got new developers productive within 1–2 days; cleared blockers daily and kept a close eye on where effort was creating value and where it was not
Process ownership: consolidated a micro-service landscape spread over 15+ repositories into a single monorepo, cutting backend development time by ~40% and simplifying releases for 6 engineers; set up deployment pipelines with GitHub Actions and GitLab CI; ran retrospectives and turned the feedback into concrete changes; introduced AI agents into day-to-day development
Delivered short-staffed: when the team shrank from 8 developers to 2, restructured scope, introduced AI-assisted development to hold the schedule and took on Go backend work alongside my own frontend scope
Architecture and code: defined the architecture for every project in the portfolio — the structure the rest of the team built within — and wrote roughly 90% of the frontend code myself, from SSR applications with Next.js and Remix to cross-platform apps with Capacitor
From zero to production: took a practice management platform — administration, inventory, integrated online shop, chat messenger — from an empty repository to production. Live in 7 markets with at least 7 more coming up, serving tens of thousands of users
Delivery under pressure: built and shipped a replacement online shop for a Fortune 250 client in 4 days, restoring order intake while their global shops had been offline for several weeks
Design system: built a cross-project design system used across 7 products, so new projects and features started from a shared, consistent base
Cross-platform and real-time: built iOS and Android apps with Capacitor for a client live event with 1,000+ participants — web sockets and push notifications for real-time content, Stripe payments supporting PayPal, Apple Pay, Google Pay and cards
Key technologies: React, TypeScript, Next.js, Remix, GraphQL, ConnectRPC, Redux, Zustand, Go, Node.js, Turborepo, Nx, Capacitor, Ionic, WebSockets, Stripe, PostgreSQL, Playwright, Cypress, Vitest, Storybook, GitHub Actions, GitLab CI, Claude Code, Cursor, GitHub Copilot
Maciej W.
Last position:
Senior Software Engineer at EQS Group GmbH
- Further development of the compliance products
- Responsible for the Senior Software Engineer role
- Team size: 5 - 15 people
- Tools: TypeScript, Angular 18, Node.js, Nest.js, AWS, Kubernetes/Helm Charts/Docker, GitLab (CD/CI), Elasticsearch, MySQL, OpenAI, Java, RabbitMQ
Daniel Y.
Last position:
Senior Frontend Developer at node.energy
- Significant enhancement of the B2B React SPA software "opti.node" for commercial operations management for renewable energy plant operators
- Introduced features not previously available on the market, resulting in a significant revenue increase
- Comprehensive automated tests within Storybook
- Introduced a UI library to improve developer experience and speed up feature development by about 40%
- Clear presentation of complex commercial and legal issues, with intuitive UX and UI
- UX consulting to shorten essential interaction flows by 75%
Semir A.
Last position:
Engineering Manager at Grafana Labs
- I lead a team of 10 engineers across EMEA split into 2 squads (ingest and query), focused on developing the next generation of logging systems.
- Leading the Loki team in Europe, overseeing the logging solutions at Grafana. I manage a diverse team of engineers, ranging from mid-level to principal, ensuring we deliver top-tier results.
- One of our key achievements has been the successful development and launch of ExploreLogs and AdaptiveLogs.
Dhruti C.
Last position:
Freelancer Developer
Expomate platform
- Built a cross-platform exhibitor inquiry management app using React Native and RoR 8, leveraging RESTful APIs, Solid Queue for background job processing, and Devise for authentication on the backend, with Redux and AsyncStorage for state management and local data persistence.
TaskINT platform
- Developed a unified platform for task execution, time tracking, invoicing, client relations, and staff management using RoR 8 and React.js, utilising RESTful APIs, Sidekiq for background jobs, and Zustand for state management and WebSockets for real-time data sync, with 300+ users onboarded across 5 clients.
Alex C.
Last position:
Senior Full-Stack Developer at Umbrella Organization of German Sports Clubs
- Development of a CMS-based online platform as a central hub for multimedia brand communication, focusing on accessibility, web performance, and data protection.
- Technologies: PHP, Craft CMS, Twig, HTML, CSS, JavaScript, Alpine.js, htmx.
Taher S.
Last position:
DevOps Engineer at Confidential
- Working with developers, security, and operations teams to align requirements
- Supporting product owners and development teams in using logging and monitoring solutions based on the Elastic Stack
- Developing and standardizing log schemas as well as defining practical standards for observability
- Designing and further developing logging architectures for complex, distributed multi-tenant environments
- Connecting application and infrastructure logs as well as security tools and metrics
- Optimizing data flows and modeling for analysis and reporting purposes
- Building automated infrastructures using Terraform/Terragrunt and Ansible
- Maintaining and further developing CI/CD pipelines in GitLab as well as automated development environments in Hetzner Robot
- Operating and automating Proxmox clusters including Ceph storage
- Setting up and operating Kubernetes (k3s) clusters on Fedora CoreOS including base services such as Vault, OpenLDAP, and HA Proxy
- Implementing security-critical infrastructures according to BSI baseline protection and securing existing systems
- Supporting the operation of solutions in cloud environments (including AWS)
- Working in agile teams using Scrum and Kanban
- Technologies/ applications: Elastic Stack (Elasticsearch, Logstash, Beats/Elastic Agent, Kibana), Terraform, Terragrunt, Ansible, GitLab CI/CD, GitOps, Proxmox, Proxmox Ceph, Kubernetes (k3s), OpenShift, Helm, Kustomize, Vault, OpenLDAP, HA Proxy, Hetzner Robot systems, AWS, Prometheus, Grafana, Syslog Linux/Windows, Docker, NGINX, Apache Security & Compliance (BSI baseline protection, SIEM/SOC)
Kshiti P.
Last position:
Senior Front End Engineer at People of Peony
- Built scalable and reliable web using React, TypeScript, JavaScript and open-source tooling, taking full ownership from development to deployment with minimal oversight
- Translated client requirements and visual designs into functional, user-friendly interfaces by applying UI/UX design principles, ensuring the delivered product aligned with the client's product vision
- Proactively identified and resolved complex technical issues spanning frontend and DevOps (AWS), going beyond the defined scope to ensure continuous and stable delivery, with test coverage maintained via Jest
Johannes E.
Last position:
Libri GmbH
- Operation and further development of the inventory system for booksellers (Quimus). It is an in-house development by Libri that is sold to customers as Software as a Service. The software is developed in an agile way by two developer teams (about 5 developers each). The software consists of around 25 Java microservices that mainly communicate via messaging and share a common Angular frontend. The application runs on Kubernetes in AWS.
- Technologies used: Java 17 & 21, Spring Boot 2 & 3, Hibernate, MySQL, Spring Cloud AWS, Lombok, AWS SQS, AWS SNS, AWS RDS, AWS S3, DynamoDB, Kubernetes, Docker, OpenSearch, Hibernate Search, Liquibase, Gradle, Terraform, Helm, GitLab CI, Keycloak OAuth2, TypeScript, Angular
- My focus until December 2023: Connecting additional POS systems to the inventory system. Connecting the data warehouse for report display. Extending existing features (goods receipts, invoicing, item management, ...). Operations and DevOps tasks.
- Focus from January 2024: Extracting the product search from the inventory system into a global service to use in other applications. Integrating the product search into the booksellers' online shops (also run by Libri). Importing and providing digital items in the product search.
Patrick B.
Last position:
Senior Backend Developer at stocubo GmbH
- Further development of the online shop
- IT environment: Ruby on Rails, JavaScript, Postgres, AWS, Git, Continuous Deployment, Kubernetes, SLIM
Matti L.
Last position:
FullStack Developer at Ing DiBa GmbH
- Developed and extended Fiori UI5/WebApps for areas such as general ledger, asset accounting, and others.
- Implemented backend logic and OData services for a new S/4 HANA system
- Analyzed the current state of SAP GUI transactions and derived suitable standard and custom developments
- Designed technical concepts and implemented custom UI5 apps in the Fiori Launchpad
- Automated OPA tests, extended and adapted standard Fiori apps
- Documented and created developer manuals in the wiki
- Conducted code reviews, approved and delivered software units via GitLab and SAP transports
Sebastian W.
Last position:
Software Engineer & Consultant at Freelancer
Specialized in event driven microservice architecture in AWS with NodeJS, Typescript and Vue/React/Next in the frontend
Developed a SaaS product in the B2B sector
Used AWS services: DynamoDB, Lambda, SQS, SES, EventBridge, Cognito; Serverless-Framework; Rest-API
Implemented unit tests with Jest and Mocha
Set up CI/CD pipeline with GitHub Actions
Developed a SaaS product for organization management
Worked with AWS Microservice architecture and event driven design
Utilized CDK, NodeJS OpenAI-API, React, Vue
Continued use of DynamoDB, Lambda, SQS, SES, EventBridge, Cognito, Typescript
Maintained CI/CD pipeline with GitHub Actions
Karsten L.
Last position:
UX Designer & Web Developer at Freelance
Mohammad M.
Last position:
Senior Frontend Developer / IT Consultant at Freelance
Developing modern web applications with a focus on React and Next.js
Building e-commerce and business platforms for SMEs
Analyzing and optimizing software and data structures
Planning and developing custom IT solutions
Structuring data flows and system architectures
Ongoing project work in web development and platform solutions
Tax Advisor Platform with Client Portal and Admin System:
Developing a web-based platform with an integrated client portal
Building a system consisting of a website, admin area, and client application
Developing a role-based access system (Admin / Client)
Implementing document and invoice management
Digitizing business processes
Developing high-performance frontend structures
Integrating APIs and backend logic
Coffee Business Platform with Admin System:
Developing a web application for a café with administrative features
Building internal workflows and user management
Structuring digital business processes
Developing modern UI components with a focus on performance
Shared Account Platform (Admin & Client Applications):
Developing a scalable platform with separate applications for admins and users
Building a role-based access system
Developing a modular frontend architecture with React and TypeScript
Integrating API structures and data management
Discover over 15,000 top freelancers
Statistics of experts using Jest
Aggregated from the professional profiles of matched freelancers.
Experience
16 years
Position duration
1.6 years (Germany: 1.7 years)
Positions per freelancer
11 (Germany: 12)
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Retail, Automotive
Certification focus areas
Information Technology, Product Development, Finance
Bachelor's degree or higher
77% (Germany: 92%)
Master's degree or higher
23% (Germany: 45%)
Certifications per freelancer
1
Most common languages
German, English, Spanish
Speak two or more languages
93% (Germany: 97%)
Based on our profile pool as of 29 Oct 2026.
Daily rate distribution
The chart shows how the daily rates of experts in this technology in Hamburg are distributed, based on recent contracts on our platform. Each bar covers a rate range — its height shows the share of experts charging within that range.
Average rates of experts in Hamburg using Jest
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 29 Oct 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
Jest experts industry focus
See which industries our matched freelancers work in most often — every figure is calculated live from the freelancers on FRATCH.
- Information Technology (100%)
- Retail (50%)
- Automotive (43%)
- Media and Entertainment (43%)
- Food and Beverage (36%)
- Healthcare (36%)
- Manufacturing (36%)
- Education (29%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
What Jest does
Jest is a JavaScript testing framework maintained by Meta and widely used for unit, integration and snapshot testing. It runs tests in isolation, reports results clearly and includes mocking, assertions, coverage reporting and watch mode. Teams use it to validate application logic before changes reach production.
Where it fits
Jest is common in React and Next.js applications, Node.js services and TypeScript codebases. It can test utility functions, UI behavior, API modules and asynchronous workflows. Its configuration supports monorepos, custom environments and projects that need different test settings in one repository.
- Test React components and hooks
- Mock modules, APIs, timers and browser behavior
- Check Node.js services and TypeScript logic
- Run regression tests in continuous integration
Ecosystem and tooling
Strong Jest specialists work with JavaScript or TypeScript, npm or Yarn, Babel and ts-jest where needed. They may combine Jest with React Testing Library for user-focused UI tests, Supertest for HTTP endpoints or Playwright for browser-level coverage. They also understand Git workflows, CI pipelines and coverage reports.
When companies need help
Companies often bring in freelance expertise when a codebase has fragile tests, slow pipelines or missing coverage around critical changes. Support is useful during a React migration, a TypeScript adoption, a product launch or the creation of a shared test strategy. In Hamburg, remote collaboration can suit distributed teams, while on-site workshops may help align product and engineering groups.
What good delivery includes
A reliable professional starts by mapping business behavior and existing risks rather than adding tests for coverage numbers alone. They create deterministic tests with clear fixtures, controlled mocks and useful failure messages. They separate unit, integration and end-to-end concerns so the suite remains fast and trustworthy as the application grows.
How to assess expertise
Review examples of test suites, pull requests or migration work, not just familiarity with the Jest name. Ask how the specialist handles asynchronous code, flaky tests, module boundaries, snapshots and external services. Language expectations, repository access and review habits should be agreed early, especially when Hamburg-based stakeholders and remote professionals collaborate.
Frequently asked questions
Quick answers to the questions that come up most around Jest.
Jest is used to test JavaScript and TypeScript code, including React components, Node.js services, utility modules and asynchronous workflows. It provides assertions, mocks, snapshot testing, coverage reports and a test runner in one package.
Jest offers an integrated testing experience with built-in mocking, snapshots and broad React adoption. Vitest can be attractive in Vite-based projects for its fast native integration, while Mocha is more minimal and usually requires separate assertion and mocking tools.
A strong Jest specialist should understand JavaScript or TypeScript, application architecture and continuous integration. React Testing Library, Supertest, Playwright, Babel, ts-jest and package managers are useful additions depending on the codebase.
The required depth depends on the test surface, risk and state of the existing suite. A professional handling a small unit-testing task may need less context than someone designing Jest coverage for a large React application or refactoring a flaky monorepo.
Jest work is well suited to remote collaboration because tests, configuration and results live in the repository and CI system. Clear tickets, access to test environments and regular code reviews usually matter more than physical presence, though on-site workshops can help with complex planning.
Jest works well with TypeScript when the project uses an appropriate transformer and configuration, such as ts-jest or a Babel-based setup. The specialist should align compilation, source maps, path aliases and type checking instead of treating test execution as a replacement for the TypeScript compiler.
Look for tests that describe observable behavior, isolate dependencies and fail for meaningful reasons. With Jest, review mock usage, asynchronous cleanup, fixture design, snapshot discipline and whether the suite runs reliably in CI rather than focusing only on coverage output.
Common issues include brittle snapshots, over-mocked modules, shared state, slow setup and tests that depend on execution order. An experienced Jest professional can identify these patterns, stabilize the suite and improve boundaries without hiding real application failures.
The average hourly rate of freelancers in Hamburg, Germany who have used Jest in their recent projects is 88 €, which corresponds to a daily rate of about 705 € based on an 8-hour working day.
Of the freelancers in Hamburg, Germany who have used Jest in their recent projects, 77% hold at least a Bachelor's degree and 23% hold at least a Master's degree.
On average, freelancers in Hamburg, Germany who have used Jest in their recent projects have 16 years of professional experience, with a single engagement typically lasting around 1.6 years.
The most common languages among freelancers in Hamburg, Germany who have used Jest in their recent projects are German (100%), English (93%), and Spanish (21%).
The most common industries among freelancers in Hamburg, Germany who have used Jest in their recent projects are Information Technology (100%), Retail (50%), and Automotive (43%).
The most common business areas among freelancers in Hamburg, Germany who have used Jest in their recent projects are Information Technology (100%), Product Development (93%), and Quality Assurance (43%).
Main locations of FRATCH Experts, who have recently used Jest
Our freelancers and interim experts are at home across the DACH region — available on-site in the major business hubs or fully remote. Choose a location to discover matched specialists, local market insights and up-to-date availability.
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Philipp Thomaschewski
FRATCH CEO
