Senior Fullstack Engineer; Python + React.js

Senior Fullstack Engineer Who is Parser?

Technology alone does not create impact—the right teams do. Founded in 2018, Parser is a boutique technology services and consulting firm helping global organisations solve complex business challenges through digital transformation, product development and AI enablement.

We are a fast-growing team of 340+ engineers and consultants across Europe (UK, Spain, Portugal), the Americas (US, Argentina, Uruguay, Colombia), and the Middle East. We combine global reach with a mindset focused on agility, senior expertise, and close collaboration.

We work as an extension of our clients’ teams, helping them define the right problems, shape solutions, and deliver technology-driven outcomes that create measurable business value. Our expertise spans software engineering, AI & data, product development, and customer experience, delivered by teams that combine strong technical depth with a consulting mindset.

If you are looking for a place where you can think beyond execution, take true ownership of outcomes, influence decisions, and continuously learn alongside top-tier specialists in a truly global environment, we’d love to meet you.

We are looking for a highly skilled Fullstack Engineer to design, develop, and maintain scalable, secure, and efficient server-side applications. The ideal candidate should have experience in microservices architecture, API development, database management, and frontend ensuring high availability and performance of backend and frontend services.

In this role, you will collaborate closely with frontend engineers, product managers, and other stakeholders to build robust backend solutions that power our applications. A strong focus on Separation of Concerns (SoC), security best practices, and
performance optimization is crucial for success in this position.

• Integrate models into backend systems and create API endpoints for model interaction (e.g., retrieving predictions).
• Develop and maintain scalable services, e.g. Microservices utilising REST, gRPC, or GraphQL, ensuring optimal performance and seamless integration.
• Optimize database queries and schemas to improve performance, scalability, and reliability.
• Implement security features, including authentication and authorization using industry-standard practices.
• Develop and maintain web interfaces using ReactJS
• Implement and maintain state management using tools such as Redux or React Query
• Collaborate with frontend developers to ensure efficient API integration and a seamless user experience.
• Troubleshoot and resolve production issues, ensuring high availability and minimal downtime.
• Write unit and integration tests to maintain code reliability and ensure high- quality releases.
• Continuously monitor and optimize backend performance using observability tools such as Datadog, Cloud Watch or similar.
• Participate in design discussions and decision-making to enhance system
  robustness and scalability.
• Maintain technical documentation to ensure clear communication of system
  capabilities and updates.

• Bachelor degree in Computer Science, Software Engineering, or any related field is required, or equivalent practical experience.
• Minimum 8 years of experience in backend development, with a strong focus on building scalable, high-performance systems.

• Python expertise, with hands‑on experience building backend services and APIs using FastAPI, Flask or similar.
• Experience in designing and developing end-to-end (E2E) tests to ensure smooth integration between backend and frontend components.
• A solid understanding of microservices architecture, event-driven systems, and service-oriented design patterns.
• In-depth knowledge of SQL databases (e.g., PostgreSQL, MySQL) and No
  
  SQL databases (e.g., MongoDB) for data management and optimization.
• Experience with ETLs and data transformation
• Solid expertise in HTML, CSS, JavaScript, and ReactJS.
• Extensive experience with cloud platforms such as AWS including services for database hosting, API management, and serverless computing.
• Proficiency with Docker for containerization and orchestration…