Senior Full-Stack Developer

AtZEMASH,we deliver high-performance digital solutions,custom software,and scalable technology frameworks for businesses across the UK and internationally.We take pride in building robust,high-quality software architectures and are looking for a Seasoned Senior Full-Stack Developer who takes deep pride in code craftsmanship,systems design,and performance optimization.

About ZEMASH

AtZEMASH,we deliver high-performance digital solutions,custom software,and scalable technology frameworks for businesses across the UK and internationally.We take pride in building robust,high-quality software architectures and are looking for a Seasoned Senior Full-Stack Developer who takes deep pride in code craftsmanship,systems design,and performance optimization.

Role Overview

We are seeking aSenior Full-Stack Developerwith6 to 7+ yearsof hands-on experience in full-stack architecture.In this role,you will lead the design and development of complex digital products,taking ownership of backend services,dynamic front-end interfaces,and core system architectures.

The ideal candidate does not just write functional code—you possess anin-depth understanding of code execution, underlying framework architectures, optimization, and scalable engineering practices.As you will be working closely with a UK-based team and stakeholders,fluent English communication (written and spoken)is strictly required.

Key Responsibilities

• End-to-End Architecture & Development:Design,build,and maintain scalable full-stack applications using Python,Java,and React.
• Deep Code Craftsmanship:Write clean,highly performant,well-documented,and testable code.Deeply analyze code performance,memory utilization,execution context,and algorithmic efficiency.
• Backend Systems & APIs:Develop robust RESTful and GraphQL APIs,microservices,and system integrations using Python and Java frameworks.
• Front-End Excellence:Build dynamic,responsive,and intuitive user interfaces in React,ensuring seamless UX and optimal browser performance.
• Code Reviews & Quality Standards:Enforce rigorous code quality standards,conduct thorough peer code reviews,and mentor team members on architectural best practices.
• Database & Infrastructure Management:Design efficient database schemas (SQL/NoSQL),write optimized queries,and assist with cloud deployment/CI-CD pipelines.
• Cross-Functional Collaboration:Partner directly with product managers,UX designers,and UK-based clients to translate technical requirements into clean software solutions.

Requirements & Qualifications

Experience & Core Competencies

• Minimum 6 to 7 yearsof dedicated,hands-on experience in full-stack software development.
• In-Depth Mastery of Python & Java:Deep knowledge of core language internals,asynchronous programming,concurrency models,memory management,and major frameworks (e.g.,Django,FastApi,Flask / Spring Boot).
• Advanced React Proficiency:Strong experience with React fundamentals (Hooks,Context API,Redux/Zustand,state management,SSR/Next.js,performance profiling,and component lifecycle).
• Deep Technical Foundations:Exceptional knowledge of Data Structures,Algorithms,System Architecture,Object-Oriented Design (OOD),and Design Patterns.You understandwhyandhowcode works under the hood.

Communication & Soft Skills

• Fluent English Communication:High fluency in both spoken and written English isessentialfor daily stand-ups,technical documentation,and direct collaboration with our UK team and clients.
• Problem-Solving & Ownership:Strong analytical mindset with a passion for debugging,root-cause analysis,and optimizing complex systems.

Technical Stack Expectations

• Languages & Frameworks:Python,Java,JavaScript (ES6+),TypeScript,React.js.
• Databases:PostgreSQL,MySQL,Redis,MongoDB.
• DevOps & Tools:Git,Docker,CI/CD pipelines,AWS/GCP experience is a strong plus.
• Testing:PyTest,JUnit,Jest,React Testing Library,TDD principles.

What We Offer

• Opportunity to work on high-impact projects with a UK-based technology company.
• A collaborative culture that values code quality,continuous learning,and engineering excellence.
• Flexible working environment with remote options.
• Competitive compensation matched to experience and technical capability.