Jest Experts in Berlin
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Meet FRATCH Experts in Berlin, who have recently used Jest
Aruldass Arulanandu
Last position:
Web Module Lead at Mphasis Limited
- Led the end-to-end delivery of enterprise full-stack web applications by driving requirement analysis, solution design, frontend and backend development, database design, API integration, code reviews, team coordination, Agile execution, CI/CD deployments, production support, performance optimization, security implementation, and stakeholder collaboration to deliver scalable, high-quality software solutions.
Oleg Abrazhaev
Last position:
Staff Software Engineer at Kpler Germany GmbH
- Delivered a new notifications platform implementation built from scratch to replace existing and upcoming services
- Collaborating with other teams to integrate more domains
Tech stack:
- Data: Scala 3, Apache Kafka, Python, Airflow, Astronomer
- BE-FE: TypeScript, NestJS, Java, Spring Boot, Vue
- Dev-ops: AWS, PostgreSQL, Docker, GitHub Actions, Kubernetes, Helm, ArgoCD
Maciej Rosiek
Last position:
Full Stack Developer (Freelancer) at Runbuggy
- Led development of RunBot AI assistant autonomously using LLM-powered workflow automation (React, TypeScript, Java, MongoDB, NATS)
- Architected TMS platform providing unified transportation management and real-time logistics visibility with AI processing pipelines
- Designed event-driven microservices architecture supporting marketplace
- Drove architectural decisions and technical leadership across full-stack platform development
Nada Sadek
Last position:
Freelance Senior Frontend Engineer at Self-Employed
- Senior software engineer focused on React, TypeScript and AI-assisted product workflows
- Build frontend systems for complex SaaS products, internal tools and operational workflows
- Recent work includes AI evaluation tooling, support reliability analysis and developer-focused QA systems
- Available for freelance and contract engagements, especially remote-first projects
Mario Jelinski
Last position:
Architect / Developer at handyhase
- Overhaul of the entire design and implementation of new UI/UX aspects using React
- Planning of the software architecture and structuring of the project for long-term scalability using Git for version control
Qaiser Abbasi
Last position:
Freelance Lead DevOps Engineer at Schwarz Gruppe Produktion
Bootstrapping a CloudOps team and building a multi-cloud provider backend for a low-code Internal Developer Platform (IDP) with env zero
Introducing user story mapping, ADRs, milestones, and backlog management
Designing and developing core APIs, setting up CI/CD pipelines, OpenTofu/Terraform scripts
Representing and communicating the team with third-party stakeholders (e.g. env zero)
(Cross-)team coaching on DevOps, software design, Terraform, Golang, and agile practices
Alexandr Kuĉun
Last position:
Senior Consultant at Insurance Industry Client
- Single-handedly executing end-to-end legacy system migration to modern stack, working autonomously with minimal supervision
- Converting stakeholder resistance into buy-in through regular demos and feedback sessions with initially skeptical internal teams
- Proactively identifying improvements to common libraries beyond project scope
Julien Look
Last position:
MLOps Engineer at SAMGEN
- Building and scaling cloud infrastructure on GCP to support a SaaS platform for industrial clients
- Designing and implementing a data-driven DevOps pipeline for streamlined deployment and CI/CD workflows
- Collaborating with Data Science team on MLOps workflow to automate integrated retraining
Max Degterev
Last position:
Tech Lead, Interim CTO/CPO at MatchDispatch
I worked on automating cold outreach.
- Developed a queue architecture to support the parallel execution of large volumes of background tasks.
- Integrated multiple email delivery providers.
- Implemented an LLM-based data enrichment process.
Technologies: TypeScript, React, Node.js, Next.js, Drizzle ORM, PostgreSQL, Next-Auth, JWT, Docker, Kubernetes, AWS, CloudFlare, Traefik, Groq, Jest, Figma
Adam Hammad
Last position:
AI Software Engineer at Adevinta
- React
- Python
- Langchain
- GPT
- Typescript
- AWS
- Bedrock
- Docker
- Developing AI powered marketplace tools for a range of solutions across the Adevinta ecosystem.
Mehul Jain
Last position:
Physiobuddy
- Project for mobile users to perform physiotherapy remotely.
Daniel Da Rocha
Last position:
Full-stack web developer at birdeatsbug.com
- Fullstack development of our product: a web app (VueJS), Chrome extension (VueJS), SDK (JS), API (NodeJS), GraphQL server (Hasura, Postgres)
- Included development of multiple user-facing features, conversion of app and extension from Vue2 to Vue3, implementation of E2E testing system (Playwright), as well as debugging and refactors, on a team from 2 to 4 developers
- Deployment on Google Cloud Storage, including management of CI pipelines and jobs
Kim Kern
Last position:
Lead Fullstack Node/React Developer at Rytle
- Development of React.js / Next.js web application, displaying live sensor data and optimized routes on interactive maps.
- Architected and managed Node.js backend services in Docker containers integrated with Kafka, responsible for order management and routing.
- Guided and supported junior developers in their professional growth as team lead developer.
- Technologies: node.js, React, TypeScript, Postgres, Docker, Kafka, Github CI, ArgoCD
Sebastian Fuentes
Last position:
Senior Frontend Dev / Consultant at bettermarks.de
- Developing / Maintaining current modules
- Asserting the current state of the architecture and implementation
- Giving guidance for future development
- Mentoring team members
- Developing a standard blueprint library for others to follow
Technologies: React, Redux, Jest, Kotlin
Sharvy Ahmed
Last position:
Senior Ruby Software Engineer at Toptal
- Toptal is an exclusive network of the top software developers in the world. Top companies hire Toptal talent for their most important projects.
- Designed and extended backend REST APIs for CRM, Inventory, and Automation platforms using Ruby on Rails and PostgreSQL.
- Improved architecture and CI/CD workflows; increased test coverage and tightened release cycles using AWS, Hetzner, Docker, Kubernetes, GitHub Actions, CircleCI, Linux, Unix.
- Containerized services with Docker and deployed using Kubernetes to support high uptime and horizontal scaling.
- Worked closely with product and design to translate specs into clear deliverables and ship fast.
Discover over 15,000 top freelancers
Statistics of experts using Jest
Aggregated from the professional profiles of matched freelancers.
Experience
15 years
Position duration
1.4 years (Germany: 1.6 years)
Positions per freelancer
12
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Media and Entertainment, Education
Certification focus areas
Information Technology, Product Development, Business Intelligence
Bachelor's degree or higher
93% (Germany: 88%)
Master's degree or higher
40% (Germany: 42%)
Certifications per freelancer
1 (Germany: 2)
Most common languages
English, German, Russian
Speak two or more languages
94% (Germany: 97%)
Based on our profile pool as of 30 Aug 2026.
Daily rate distribution
The chart shows how the daily rates of freelancers in this technology in Berlin are distributed, based on recent contracts on our platform. Each bar covers a rate range — its height shows how many freelancers charge within that range.
Average rates of experts in Berlin 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 30 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
About the technology
Test coverage
Jest is a JavaScript testing framework for unit, integration, and snapshot tests. Teams use it to check UI logic, API behavior, utility functions, and regression risk in React and Node.js projects. It fits well when fast feedback and clear test results matter.
Core setup
- Configure test environments such as jsdom or node
- Set up mocks, spies, and timers
- Tune transforms for Babel or TypeScript
- Organize assertions with clear test files and fixtures
Strong specialists know how to keep tests readable, stable, and easy to maintain as code changes. They also understand where to test behavior and where to avoid brittle implementation checks.
Ecosystem fit
Jest often appears in stacks built with React, Next.js, TypeScript, and Node.js. It is also common in monorepos where shared packages need consistent test rules. Good experts can align Jest with linting, coverage reporting, and CI checks.
When companies need help
- Flaky tests slow down releases
- Old test suites break after framework upgrades
- Coverage is uneven across features and packages
- Mocks, setup files, or snapshots are hard to trust
Freelance support helps when a team needs quick cleanup, a safer migration, or a better test strategy without pausing product work. In Berlin, this is common for product teams that ship web apps, internal tools, and platform services with mixed in-house and remote collaboration.
What strong experts do
A strong Jest expert writes tests that match how the code really runs. They handle async code, mocking, test isolation, and custom matchers with care. They also spot weak assertions, duplicate coverage, and test suites that pass but do not protect the product.
Working model
Jest work is often done remotely, with focused reviews in the repo and clear tickets. On-site time can help during audits, test strategy workshops, or migration planning. The best specialists communicate well in English and adapt to the team’s release flow and review process.
Frequently asked questions
Everything clients usually want to know about Jest, in one place.
Jest is used to test JavaScript and TypeScript code with fast feedback and clear failures. Companies bring it in for unit tests, integration tests, snapshot checks, and coverage around React or Node.js features. It helps teams catch regressions before code reaches production.
Jest is an all-in-one test framework with built-in mocking, assertions, spies, and snapshot support. Mocha is more flexible but often needs more setup, while Jasmine follows a different style and toolset. Vitest is a close alternative for Vite-based projects, but Jest is still common in established React and Node codebases.
A strong Jest specialist usually knows JavaScript well, and often TypeScript, React, Node.js, and CI pipelines. They should also understand Babel or ts-jest, mocking patterns, async code, and how to keep tests stable in a changing codebase. For frontend work, familiarity with jsdom and testing-library is a plus.
A small test cleanup can be handled by a Jest expert who knows the stack and the repo structure well. Larger work, such as a migration, flaky test audit, or monorepo test redesign, benefits from someone who has handled similar cases before. The key is practical experience with the exact setup you run.
Yes. Jest work is usually repo-based, so remote collaboration fits well as long as the team shares tickets, branch access, and review habits. Berlin companies often mix remote work with occasional in-person sessions for planning, pairing, or release hardening.
Look for a Jest specialist who writes focused tests with meaningful assertions, not just high coverage numbers. Good work avoids brittle snapshots, handles async behavior correctly, and keeps mocks close to the real system design. Clear structure and maintainable setup files are strong signs of quality.
Jest is a strong choice when your team wants a proven JavaScript test framework with broad ecosystem support. It is especially practical for React, Node.js, and TypeScript projects that need mocking, snapshots, and stable CI checks. If your stack is centered on Vite, a team may also compare it with Vitest before deciding.
A Jest freelancer works best with access to the repository, the package scripts, and a few examples of failing or brittle tests. They also need to know the framework stack, the CI setup, and any custom helpers or test data patterns. With that context, they can improve the suite quickly without guessing.
The average hourly rate of freelancers in Berlin, Germany who have used Jest in their recent projects is 84 €, which corresponds to a daily rate of about 671 € based on an 8-hour working day.
Of the freelancers in Berlin, Germany who have used Jest in their recent projects, 93% hold at least a Bachelor's degree and 40% hold at least a Master's degree.
On average, freelancers in Berlin, Germany who have used Jest in their recent projects have 15 years of professional experience, with a single engagement typically lasting around 1.4 years.
The most common languages among freelancers in Berlin, Germany who have used Jest in their recent projects are English (100%), German (88%), and Russian (19%).
The most common industries among freelancers in Berlin, Germany who have used Jest in their recent projects are Information Technology (100%), Media and Entertainment (63%), and Education (50%).
The most common business areas among freelancers in Berlin, Germany who have used Jest in their recent projects are Information Technology (100%), Product Development (100%), and Quality Assurance (50%).
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.
Hamburg 
Munich Request a free demo
Get in touch with the FRATCH team and we will get back to you within 4 hours.
Would you rather directly get in touch?
We always have the time for a call or email!
Philipp Thomaschewski
FRATCH CEO
