React Native Experts in Berlin

Stefan O.

AI Product Leader

Last position:

Founder at ProtocolEngine.io

Evidence-led health intelligence platform turning published research into personal health protocols. It scores 430 habits, foods, and supplements against the studies behind them, and moves the score when the evidence moves. Built solo.

Built the daily ingestion pipeline across PubMed, bioRxiv, and medRxiv: 43,000+ papers from 3,400+ journals processed into 230,000+ typed evidence claims, each one traceable back to the study it came from.
Designed the six-factor evidence scoring model and the public changelog behind it, so no recommendation ever appears without the papers underneath it. 23,000+ grade changes recorded and explained to date.
Shipped an entity information model connecting every intervention to its mechanisms, biomarkers, and outcomes: 118 biomarkers with region-specific reference ranges, 77 mechanisms, 32 graded outcomes.
Built the personalisation layer: blood panel ingestion that reads lab PDFs with a vision model and corrects results for draw time against the user's wake anchor, plus Oura, WHOOP, and Withings integration for daily readiness context.
Operate eleven specialised review agents over the corpus and codebase, covering paper curation, retrieval quality, health-claim compliance across EU and US regimes, and security.
Shipped the Evidence Assistant, a RAG assistant that answers from the claim database and cites the underlying papers, plus a B2B practitioner tier, an Expo React Native app, and localisation across 3 languages and 7 markets.

Stack: Next.js 16, TypeScript, Supabase, pgvector, Anthropic Claude, Vercel, DeepInfra.

Viktor S.

AI Engineer & Full-Stack Developer

Last position:

AI Engineer (Freelance) at Empion

Enterprise AI content categorization and AI-powered web research.

Built multi-LLM evaluation framework with annotated data
Iterated LLM error rates based on annotated datasets
Implemented AI-powered web research pipeline Stack: LLM, evals, OpenRouter, Python, Node.js, TypeScript, React

Alexandr K.

Principal Engineering Consultant

Last position:

Technical Co-Founder at Dealyv

Joined the initial development team and helped transform an n8n prototype into a production-ready 0-to-1 product in a fast-paced environment.
Owned delivery across CRM and Twilio integrations, customer communication workflows, and administrative interfaces.
Collaborated on AI evaluation, microservice architecture, and other cross-functional product and engineering topics.
Supported the CEO across VC communications, customer acquisition, product positioning, onboarding, documentation, pricing, and sales.

Anna M.

Senior JavaScript Engineer - TypeScript, Frontend Architecture & Developer Experience

Last position:

Freelance Frontend Consultant at Mister Spex

Developed complex React/TypeScript frontend systems for highly customizable lens products.
Designed internal tooling for validating and managing product configuration constraints.
Led accessibility initiatives to align customer-facing applications with EU accessibility requirements.
Worked extensively in large legacy codebases while incrementally improving maintainability and developer experience.
Collaborated across multiple teams in an international e-commerce environment.

Marvin M.

AI Engineer & Architect · LLM and Multi-Agent Systems

Last position:

Co-founder & CTO · Freelance Software Engineer (AI & SaaS) at Self-employed

Self-employed · Berlin, Germany
Co-founded the company and own the entire technical side: product architecture, backend, frontend, infrastructure and operations.
Designed and built the Automated Booking System (ABS) as well as the core platform and payment logic.
Development of AI-powered SaaS products, from architecture through backend and frontend to production operation.
Technical consulting on product architecture, data protection and permissible automation.
Building, running and monetising my own API products for AI agents, each available as a REST interface and as an MCP server.
Full ownership of architecture, infrastructure, billing, legal texts and go-to-market.

Krishna M.

Associate Product Manager

Last position:

Associate Product Manager at Carelon Global Healthcare LLP

Defined and executed product vision & strategy, collaborating with UX, architecture, and engineering teams, resulting in a 30% improvement in user satisfaction across key product touchpoints.
Owned end-to-end product lifecycle management, overseeing the launch of 5 major product updates, improving product efficiency and feature adoption by 25%.
Defined and structured epics, features, and user stories; validated and ensured 100% of completed stories met definition of ‘Done' before release.
Led backlog grooming, prioritization (WSJF, MoSCoW), and sprint planning, ensuring 95% on-time delivery of features in quarterly release cycles.
Worked with technologies: API, Angular, Node, ReactNative (Mobile), SQL, Kafka, AWS cloud with ES (Elastic search) with JSON file indexes.
Used Confluence and Jira for maintaining product details and product backlogs for 10 years.
Used Figma, Sketch, Miro for 4 years.
Directed cross-functional teams, coordinating with developers, designers, and business units, driving a 40% reduction in time-to-market for critical features.
Spearheaded product release demos, UAT, and go-to-market (GTM) strategies, leading to a 15% increase in user adoption within the first quarter of launch.
Optimized member experience on Anthem's digital health platform, resulting in a 20% increase in active user engagement and a 10% boost in member retention.

Murad H.

Senior Software Engineer · Tech Lead · AI Engineer

Last position:

Founder & Technical Lead at Hubpoint.Ai

Founded an AI-powered scheduling and business-management SaaS for SMBs, owning technology strategy, architecture, product development, UX, billing and go-to-market execution.
Architected and shipped a multi-tenant platform with REST APIs, RBAC, CRM, billing and notifications, powering the manager dashboard, admin console, booking experience and iOS/Android applications.
Led and mentored 7 software engineers, 1 DevOps engineer, 1 QA engineer and 1 UX/UI designer, while remaining hands-on across backend, frontend and product delivery.
Built AI voice and chat agents using Python/FastAPI, OpenAI and Anthropic APIs, RAG, pgvector and tool calling; integrated Twilio, Google Calendar/Meet, Stripe and Firebase.
Owned production infrastructure and automated delivery across separate environments using Docker, Nginx, GitHub Actions and Grafana; represented the company at accelerators and international startup events.

Selected stack: Python, FastAPI, Node.js, Vue 3, React/Next.js, React Native, PostgreSQL, Redis, Docker

Cristian P.

iOS Team Lead

Last position:

iOS Team Lead at Qlaunch Gmbh

Contributed to the architecture design process, resulting in scalable and maintainable solutions for complex projects.
Enhanced app performance by optimizing code and implementing efficient algorithms.
Stayed current with industry trends to ensure implementation of best practices in app development.
Led a team of iOS developers for timely completion of projects and achieving client satisfaction.
Translated basic design plans into full iOS app frameworks, delegating project components to appropriate team members.
Estimated work hours and tracked progress using Scrum methodology.

Maciej R.

Full Stack Developer

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

Ersin K.

Founder & Lead Architect

Schönefeld

Last position:

Founder & Lead Architect at ORBYNT / 7Style

Full automation of the software development process: ticket analysis → AI coding agents → pull request → automated code review → deployment
Multi-tenant architecture with 82 database models and real-time WebSocket monitoring
Integration of 40+ AI tools with Claude & GPT
Tech stack: React, TypeScript, Express.js, PostgreSQL, Redis, BullMQ
Platform in productive use with paying customers

Unnikuttan V.

Managing Director (Co-Founder)

Last position:

Managing Director (Co-Founder) at AathmaSignals

Spearheading investor outreach and partnership development as founding MD, building the business case and technical narrative needed to attract initial funding and strategic collaborators in the digital health space
Designing multi-agent AI systems for autonomous biosignal analysis, orchestrating LLM-based reasoning pipelines with domain-specific medical context to enable intelligent, clinical decision support

Benjamin F.

Freelance Product Manager, Product Owner, Scrum Master & Agile Coach

Last position:

Freelance Product Manager, Product Owner, Scrum Master & Agile Coach at Freelance

Freelance product owner, scrum master and agile coach in various projects spanning from local agencies to multinational corporations in diverse industries.
Last projects:
Adevinta: Technical Project Manager responsible for coordination of several sub-workstreams building the world’s largest classifieds multi-tenant platform.
Aroundhome (a ProSiebenSat.1 company): Product Manager implementing and verifying on the business side a concept for digital qualification of user requests for matching service providers.
Peek & Cloppenburg Düsseldorf: Product Manager Mobile advising on and guiding the rebuild of Android and iOS apps.
Visual Meta GmbH (an Axel Springer company), Berlin: Director Product co-leading the Product & Engineering department together with the Director Engineering.
Responsibilities at Visual Meta GmbH:
Define and deliver a 3–5 year horizon product strategy including a product vision & mission connecting to existing company strategy and strategies from adjacent departments.
Refine an existing OKR process together with OKR master and directors of other departments to increase focus and outcome.
Support the Director Engineering in creating a platform transformation strategy to transform a monolithic on-premise tech stack into a service-oriented, cloud-based architecture and establish a domain-based organizational setup.
Accountability for a motivated and talented team of 5 head-level colleagues and 17 operational team members from product management, data and UX/UI design.
Key achievements at Visual Meta GmbH:
Defined and delivered a 3–5 year horizon product strategy including a product vision & mission.
Increased focus within OKR process by moving from 10 company-level objectives to 2 and from several hundred team-level key results to a few dozen.
Created a career path framework for the product team defining roles and responsibilities from junior to head level positions.

Bertrand R.

Interim IAM Product Owner (Identity Management)

Last position:

Interim IAM Product Owner (Identity Management) at REWE digital GmbH

Establishing Identity & Directory Management as a new (split-off) team & product within the IAM cluster.
Leading the “Identity & Directory Management” product (8 people) as Product Owner.
Concept for ‘Digital Identities’, i.e. IDs with n users/accounts and strategy for a modernized product offering.
Upgrading APIs, migrating to a containerized infrastructure, rolling out international markets & standardized solutions across the REWE enterprise group.
Tech: OpenText™ (NetIQ) eDirectory & Identity Manager, LDAP, SAP HR/HCM, Docker/Kubernetes/Podman, REST APIs, Microsoft Active Directory & Entra ID, postgresDB, Keycloak, Ansible, Cyberark (PAM), Apache Kafka, Jira, Confluence, Miro.

Julien L.

MLOps Engineer

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 D.

Tech Lead, Interim CTO/CPO