Senior Mobile Engineer - React Native, Platform/Infrastructure (all genders)

HelloFresh; Warszawa; On-site; PLN 190,000 - 260,000; Full time

Benefits offered by this job

Global collaboration at scale

Real-world impact on 6+ million users

Technical leadership opportunities

End-to-end development and delivery

Workspace access at Warsaw CentrePoint

Job summary

HelloFresh in Warsaw, Poland, is seeking a Senior Mobile Engineer for its HelloTech unit. You’ll help migrate a white-labeled multi-brand app from native React Native toward a scalable greenfield architecture, building robust mobile software with a strong focus on performance, tooling, and reliability.

Join a team delivering core mobile platforms across iOS and Android, with emphasis on monorepo architecture, migration workflows, and data-driven decisions to ship high-quality experiences at

Qualifications

• Deep, production-tested React Native expertise across iOS and Android.
• Experience bridging native code and RN components in a large app.
• Strong understanding of app performance and debugging in mobile stacks.
• Ability to work across a monorepo and contribute to shared tooling.

Responsibilities

• Contribute to brownfield-to-greenfield migration in a multi-brand RN app.
• Support monorepo scaling across multiple squads and shared packages.
• Strengthen CI/CD pipelines in Bitrise and evaluate Expo migration.
• Build and extend end-to-end test coverage with Maestro.
• Improve observability with Honeycomb dashboards and tracing.
• Collaborate with engineers and PMs to drive technical decisions.
• Investigate and resolve production issues to maintain stability.
• Document design decisions with ADRs or lightweight write-ups.

Skills

React Native

iOS Swift

Android Kotlin

Tools

Bitrise

Expo

Honeycomb

Maestro

Job description

Work with HelloFresh in Warsaw and its HelloTech organisation, HelloFresh’s global technology backbone with more than 1000 people, building the digital products that power our end-to-end food experience. From meal kits and ready-to-eat meals to specialty offerings like pet food and premium meat & seafood, HelloTech creates the platforms that bring tailored food solutions to millions of customers every month. Our subscription-based, direct-to-consumer model relies on technology at every step, from customer-facing apps and personalization logic to pricing, forecasting, supply chain optimization, and initiatives that help reduce food waste. While our brands operate independently to serve distinct customer needs, they are united by shared platforms, data, and operational excellence built by HelloTech.

About the role: What's in the Box

As a Senior Mobile Engineer in the Consumer Foundations tribe, you'll join the Client Platform squad and work hands-on to help evolve our mobile platform. Alongside engineering and product teammates, you'll help move our white-labeled, multi-brand application from a native brownfield React Native setup toward a more scalable greenfield architecture. This is a chance to build strong technical foundations, contribute to shared tooling, and help a growing engineering organization ship reliable mobile software.

Our stack: Core: React Native, iOS (Swift), Android (Kotlin) Architecture: Monorepos, White-labeling, shared npm packages CI/CD & Automation: Bitrise, Expo (Future) Observability & Testing: Honeycomb, Maestro E2E

What you’ll do: The Recipe

At HelloFresh we are moving away from a model where software developers just execute tickets toward one where product engineers are trusted to own customer problems. A Product Engineer takes a problem, forms a point of view, validates it with customers and data, and ships it using AI as a force multiplier.

• Contribute to Migration Work: Help execute the brownfield-to-greenfield React Native migration within our white-labeled, multi-brand application ecosystem.
• Support Monorepo Scaling: Work within our React Native monorepo to support concurrent development across multiple squads, and help maintain shared npm packages used across mobile and web.
• Strengthen CI/CD: Help maintain and improve our CI/CD pipelines in Bitrise, and contribute to the team's ongoing evaluation of a future Expo migration.
• Build Test Automation: Design and extend end-to-end test coverage using Maestro, helping raise the bar for release quality and confidence across the app.
• Improve Observability: Build and maintain tracing and dashboards in Honeycomb to help the team make data-informed decisions about app health.
• Collaborate Across Squads: Partner with your Engineering Manager and teammates to review technical solutions and bring good engineering practices into your day-to-day work.
• Support Application Health: Help investigate and resolve production issues, contributing to a culture of stability and reliability.
• Document Decisions: Write clear technical documentation — design proposals, ADRs, or lightweight write-ups — appropriate to the scope of the work.

What you’ll bring: The Ingredients

• Hands-on experience working with AI tooling (e.g., Claude Code, Cursor, Copilot) beyond casual experimentation. You use AI agents every day. You have a practical sense of how the context you provide to AI tools shapes output quality, and how to set boundaries on AI-generated work.
• React Native & Native Mobile Expertise: Deep, production-tested expertise in React Native, combined with strong knowledge of both iOS and Android. You understand React Native's internal mechanics, performance profiling, native code bridging, platform-specific features and constraints, as well as the respective app store release processes. You are comfortable working across the full mobile stack to build and scale enterprise-grade applications.
• Agentic Engineering: Hands-on experience using AI coding agents (Claude Code, Cursor, Copilot) in production or near-production work. You think beyond prompts to context engineering—structuring specifications, tool configurations, and information flow so agents produce reliable output. You can decompose complex workflows across agentic components, identify unreliable outputs, and introduce the appropriate guardrails where needed.
• Scale-Minded Developer Experience: Proven track record of managing and optimizing workflows, linting, caching, and build times for large engineering organizations (50+ developers).
• Systems & Monorepo Thinker: Experience managing complex build configurations, white-label scaling, and monorepo architectures.
• High Autonomy & Accountability: You are comfortable operating with a high degree of autonomy, making sound technical decisions in ambiguous situations, and supporting teams during complex production incidents.
• Deep mobile engineering expertise, with experience across the app release cycle, test automation, on-device performance and platform UX conventions.
• Exceptional Cross-Squad Influence: You have a proven ability to influence technical direction across multiple engineering teams through expertise, communication, and collaboration.
• You take full ownership. You have a bias to ship. You finish the last twenty percent.
• You have product sense and are opinionated about what should be built and why, and you can back that opinion with data and user evidence.

Above all, we are looking for individuals who will make HelloFresh better. We believe there are many different ways of developing skills and we love diverse experiences! So even if you don’t “tick all the boxes” but think you’d thrive in this role, we would really like to learn more about you.

What we offer: The Toppings

• Global collaboration at scale: Collaborate with experienced engineers and product partners across HelloTech’s international teams, in a culture of active knowledge sharing.
• Technology with real-world impact: Build and operate modern systems at global scale, supporting 6+ millions of customers and complex supply chain operations.
• Technical/Product/Design leadership: Drive best practices and influence architecture/design, quality, and ways of working in an autonomous, product-led setup.
• End-to-end development/delivery: Drive decisions from problem definition to production, improving systems and enabling long-term scalability.
• Access to workspace at Warsaw Centre Point. The hub offers modern facilities including showers, breakout zones, outdoor space, cycle parking, and refreshments (coffee, soft drinks, and fruit).