Senior Full Stack Engineer

Teya

Senior Full Stack Engineer enhancing ePOS Integration for fintech startup Teya. Building scalable frontends and supporting backend services to empower partner developers.

Posted 7/9/2026full-timePorto • 🇵🇹 PortugalSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in Full Stack Development with a focus on TypeScript, React, and GraphQL, while effectively collaborating with cross-functional teams to deliver high-performance user experiences. Proficient in optimizing web performance and maintaining clean, well-tested code across the stack.

Highest-signal resume keywords

TypeScript ExpertiseReact.js ProficiencyGraphQL API ConsumptionNext.js ExperienceWeb Performance Optimization

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

TypeScriptReact.jsGraphQLNext.jsJavaSpring BootJavaScript (ES6+)HTML5CSS3Redux

Soft Skills

Problem-SolvingAttention to DetailCommunicationCollaboration

Tools & Technologies

GitApollo ClientContext APIZustand

Industry Keywords

Full Stack DevelopmentUser ExperienceAPI IntegrationCross-Functional TeamsPerformance Bottlenecks

Tech Stack

Tools & technologies

ApolloGraphQLJavaJavaScriptNext.jsReactReduxSpringSpring BootSpringBootTypeScript

About the role

Key responsibilities & impact

Lead the design, development, and delivery of scalable, responsive full stack features for the Business Account portal using React, TypeScript, and GraphQL.
Work closely with product and design teams to understand merchant needs and translate complex financial workflows into secure, end-to-end user experiences backed by reliable APIs.
Build and maintain data-rich, high-performance interfaces for transaction feeds, balances, statements, and multi-currency views.
Develop and maintain GraphQL schemas, resolvers, and API integrations.
Write clean, maintainable, and well-tested code across the stack.
Actively participate in code reviews across frontend and backend contributions.
Identify and resolve performance bottlenecks, data inefficiencies, and production issues across the full stack.
Stay up-to-date with the latest frontend technologies, trends, and best practices.

Requirements

What you’ll need

5+ years of professional experience in frontend/web development.
Expert-level proficiency in TypeScript, including advanced type manipulation, generics, and understanding of complex type inference.
Strong proficiency in React.js and its core principles, developed with a type-safe approach.
Experience supporting Backend services in Java and Spring Boot
Extensive experience with Next.js for server-side rendering, static site generation, and API routes, with a focus on TypeScript integration.
Solid understanding of modern JavaScript (ES6+), HTML5, and CSS3.
Experience with state management libraries (e.g., Redux, Context API, Zustand) in a TypeScript environment.
Strong experience consuming GraphQL APIs (e.g., Apollo Client), with an understanding of how to define and use types for API responses.
Strong understanding of web performance optimisation techniques.
Experience with version control systems (e.g., Git).
Excellent problem-solving skills and attention to detail.
Strong communication and collaboration abilities, especially when working within cross-functional teams spanning product, design, backend, and mobile engineering.

Benefits

Comp & perks

continuous learning opportunities
supportive community
comprehensive benefits