Senior Fullstack Engineer
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 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 general 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., Microservices utilising REST, gRPC, or GraphQL, ensuring optimal performance and seamless integration.
Optimize database queries and schemas to improve performance, scalability, and reliability.




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.
Write unit and integration tests to maintain code reliability and ensure high‑quality releases.
Continuously monitor and optimise backend performance using observability tools such as Datadog, CloudWatch or similar.
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.
In‑depth knowledge of SQL databases (e.g., PostgreSQL, MySQL) and NoSQL databases (e.g., MongoDB) for data management and optimisation.
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 containerisation and orchestration tooling such as ECS (Amazon Container Services), enabling scalable application deployment.




Hands‑on experience with API security protocols, including JWT, OAuth2, and OpenID Connect, Active Directory (now Microsoft Entra ID) to secure sensitive data and control access.
Proficiency with Git for version control, GitHub Actions and CI/CD pipelines to automate and streamline development workflows.
Proficiency with performance tuning and scalability techniques, such as load balancing, caching, and database indexing.
A proactive, self‑motivated approach to addressing issues and driving improvements in backend systems.
Familiarity with message brokers such as Kafka, or AWS SQS for handling asynchronous communication.
Experience with Infrastructure as Code (IaC) tools like Terraform or CloudFormation for managing cloud infrastructure.
Knowledge of observability and monitoring tools, such as CloudWatch or Datadog, to track and troubleshoot system performance.
Familiarity with serverless architectures (e.g., AWS Lambda) and event‑driven programming paradigms.
Exposure to Agile/Scrum methodologies and tools like Jira for managing tasks and sprint planning.
Certifications in cloud technologies, such as AWS Certified Developer.
Manage, host, and serve AI/ML models (MLOps), by ensuring their scalability, reliability, and performance in production environments.
Spain: flexible remote work, with availability to travel to the UK office in Hayes, West London, once per month.

The chance to join an organization with triple‑digit growth that is changing the paradigm on how software products are built.
Medical insurance.
By applying to this role, you acknowledge that your personal data will be processed in accordance with Parser’s Privacy Notice for recruitment purposes.
Parser may use AI‑assisted tools during certain stages of the recruitment process to support operational efficiency.

📌 Senior Full-stack (React+Python) Developer (España)
🏢 Parser
📍 España