Vacancy title:
Senior Frontend Engineer

[Type: FULL_TIME, Industry: Information Technology, Category: Science & Engineering]

Jobs at:
ERICO Group Company Limited

Deadline of this Job:
Saturday, July 26 2025

Duty Station:
Mikocheni | Dar es Salaam | Tanzania

Summary
Date Posted: Monday, July 21 2025, Base Salary: Not Disclosed

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JOB DETAILS:

CAREER OPPORTUNITY

Senior Frontend Engineer – Technical Requirements

Minimum experience in this field 5years

Core Competencies

1. 1. JavaScript, TypeScript & Modern Frontend Frameworks\JavaScript/TypeScript Expertise

• Deep understanding of ES6+ features (async/await, modules, destructuring, etc.)
• Strong TypeScript skills for type-safe codebases and scalable architecture
• React Ecosystem (Web & Mobile):
• Proficient with React and React 18+ features (Concurrent Mode, Suspense)
• Strong understanding of hooks, context API, render optimization, and reconciliation
• Experienced with state management tools (Redux Toolkit, Zustand, Jotai, etc.) Next.js (Web Development):
• Advanced knowledge of SSR, SSG, ISR, and CSR strategies
• API routes, middleware, edge functions, and app directory architecture
• Image optimization, routing, dynamic imports, and SEO optimization
• WordPress (Headless & Traditional):
• Experience with WordPress as a headless CMS (using REST or GraphQL APIs)
• Proficiency in Gutenberg block development and custom themes/plugins (PHP/JS)
• Comfortable integrating ACF, WPGraphQL, and WP REST API with frontend frameworks

2. 2. Mobile Development (React Native & Native iOS/Android)

React Native (with Expo):

• In-depth knowledge of Expo SDK and bare workflow
• Handling native modules, deep linking, push notifications, and OTA updates
• Cross-platform optimization and native UI/UX consistency

iOS (Swift):

• Proficient in SwiftUI and UIKit
• Experience with Combine or async/await concurrency
• Familiarity with iOS app lifecycle, CoreData, and integration with third-party SDKs

Android (Kotlin/Java):

• Solid experience with Android Jetpack components (Navigation, LiveData, ViewModel)
• Proficient with Gradle build configuration, Coroutines, and Room DB
• Understanding of Android app architecture patterns (MVI, MVVM)

3. 3. API Integration & State Management

• Experience integrating RESTful APIs, GraphQL, and WebSockets
• Familiarity with GraphQL clients (Apollo, Relay) and efficient query design
• Handling optimistic UI, pagination, caching, and error boundaries
• Authentication flows (OAuth2, JWT, biometric login for mobile apps)

4. 4. Design Patterns & Architecture

• Strong grasp of frontend design patterns (Container-Presenter, HOC, Render Props, etc.)
• Experience architecting modular, maintainable, and scalable component libraries
• Familiarity with micro frontends, monorepos (Nx, Turborepo), and atomic design principles
• Applying domain-driven design (DDD) principles in frontend contexts

5. 5. Testing & Quality Assurance

Unit Testing

• React Testing Library, Jest, Enzyme (legacy) E2E & Integration Testing:
• Cypress, Playwright, Detox (for mobile) Code

Quality:

• Linting (ESLint), formatting (Prettier), static analysis

(TypeScript strict mode, SonarQube)

• Visual regression testing (Percy, Chromatic)

6. 6. DevOps, CI/CD & Deployment

Git & GitHub:

• Mastery of Git commands and pull request workflows
• Familiar with GitHub Flow, Trunk-Based Development, and conventional commits

CI/CD Pipelines (GitHub Actions, Bitrise, Expo EAS):

• Automating build/test/deploy for web and mobile apps
• Configuring environments, secrets, and app signing (Expo, Xcode, Android Studio)
• Mobile release management: TestFlight, Google Play Console Hosting & Deployment:
• Vercel (Next.js), Netlify, Firebase, AWS Amplify for web
• App Store/Play Store submission workflows and OTA updates (CodePush, EAS Update)

7. 7. Monitoring, Performance & Analytics

Performance Optimization:

• Web Vitals, lazy loading, code-splitting, bundle analysis (Webpack/Next.js)
• Mobile performance: FPS, memory usage, native profiling tools (Xcode Instruments, Android

Profiler) Monitoring Tools:

• Web: Sentry, LogRocket, Datadog RUM
• Mobile: Firebase Crashlytics, Sentry Mobile, Instabug

Analytics:

• Integration of Google Analytics, Segment, Mixpanel, Firebase Analytics

8. 8. Security Best Practices

• Cross-Site Scripting (XSS), Cross-Site Request Forgery (CSRF), CORS management
• Mobile security: secure storage (Keychain, Keystore), biometric auth
• Input sanitization, HTTPS enforcement, content security policies
• Secrets management for frontend (Expo Secrets, environment variables, encrypted storage)

Soft Skills & Additional Expectations

• Strong collaboration with design, backend, and product teams
• Ability to lead UI architecture decisions and code reviews
• Mentoring junior developers and advocating for frontend best practices
• Experience working in Agile/Scrum environments
• Excellent communication and documentation skills

Work Hours: 8

Experience in Months: 60

Level of Education: bachelor degree

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