Senior Fullstack Application Developer
Our Vision
PSL Group is a general organisation dedicated to putting information at the service of medicine. The companies and people of the PSL Group aim to improve medical care by serving those who need it, those who provide it, and those who seek to improve it.
To this end, we want our information and education services to contribute to the goals we share with our clinicians, clients and supporters, namely: to accelerate the advancement of medicine and help people enjoy better, longer lives.
Purpose
Our key contribution to society is to help clinicians and those who support them provide state-of-the-art medical care.
Our primary business purpose is to help clients and supporters increase the effectiveness of activities pertaining to scientific communication, medical education and the maintenance of clinician audience intimacy.
Position Summary
We are looking for a
Senior Fullstack Application Developer
to define, design and deliver scalable, sustainable and secure web applications at the core of the organization. You will own features end to end: modern
React
frontends, robust
PHP (Symfony)
and
Node.js / TypeScript
backends, and cloud-native infrastructure on
AWS
, from containerized services on
Kubernetes (EKS)
to
serverless
workloads on
Lambda
.
A growing part of the role is building with
Generative AI
: integrating frontier models such as
OpenAI GPT
,
Anthropic Claude
,
Google Gemini
(via Vertex AI),
Amazon Bedrock
models and open-weight models such as
DeepSeek
, and using
Claude Code
and agentic tooling to plan, build, review and test software. Ideal candidates are proactive engineers who are comfortable making architecture decisions across the stack, modernizing legacy systems, and collaborating closely with product, QA and business teams in a fast-paced, highly communicative, innovation-driven environment.
What You Will Do
Build modern, responsive web interfaces using
React
,
Next.js
,
TypeScript
,
JavaScript
and
Vite
.
Translate complex UI/UX designs into clean, accessible, responsive code.
Design and develop scalable and secure backend APIs using
PHP (Symfony)
and
Node.js / TypeScript
.
Architect, deploy and maintain containerized services on
AWS EKS
and
serverless
applications using
Lambda,



API Gateway, SQS/SNS, EventBridge, Step Functions
and
DynamoDB
.
Integrate third-party services and
GenAI APIs
(streaming responses, RAG, agents, MCP) for intelligent application behavior.
Work with the PM to provide estimates for technical activities; analyze requirements and document architectural recommendations, systems and code-level design.
Write unit, integration and functional tests;
automate regression and integration tests using AI
; maintain high code coverage and code quality.
Perform code reviews for standards, quality assurance and security (static analysis, container scanning, AI-assisted PR review).
Implement website optimizations: front-end performance, CDN usage, caching strategies and efficient media handling.
Modernize legacy components (framework upgrades, migrating server-rendered views to React, moving pipelines to GitHub Actions).
Address day-to-day and longer-term technical issues and participate in R&D; to evaluate new technologies, solutions and software.
Mentor junior team members and contribute your skills wherever required.
Key Skills, Knowledge & Professional Experience
Over
5 years
of experience in web development, with proven delivery of highly performant, scalable stacks – frontend and backend.
Experience planning, debugging and writing code with
Claude Code
(skills, plugins, sub-agents, MCP) and other agentic coding tools.
Skills to design software end to end (DB structure, components, API, integrations).
Strong understanding of distributed systems,
event-driven architecture
and API design (REST, OpenAPI).
Solid experience with
PHP / Symfony
and
Node.js / TypeScript
.
Strong experience with
React
and modern
JavaScript / TypeScript
.
Hands-on experience with
AWS
(containers and serverless).
Experience with
LLMs
(agents, embeddings, MCP, RAG, APIs of frontier LLMs).
Development best practices, including unit testing,



code reviews and design patterns.
Experience mentoring junior team members; good communication skills.
Mindset of an engineer (attention to application performance, security, debugging skills).
Technical Skills
Languages & Frameworks – Frontend:
JavaScript, TypeScript, React, Next.js, React Native, Vite, HTML5, CSS3 (SASS/SCSS)
Redux Toolkit, TanStack Query, React Router, Material UI (MUI)
Languages & Frameworks – Backend:
PHP, Symfony, API Platform, Doctrine ORM, OpenAPI
Node.js, TypeScript, Express, AWS SDK
Cloud & DevOps:
AWS: EKS, Lambda, API Gateway, Cognito, S3, CloudFront, SQS, SNS, EventBridge, Step Functions, DynamoDB, RDS, CloudWatch
Infrastructure as Code: AWS SAM / CloudFormation, Serverless Framework, AWS CDK
Containers: Docker, Kubernetes
CI/CD & quality: GitHub Actions, SonarQube, New Relic
Databases:
MySQL, PostgreSQL, DynamoDB, Redis, OpenSearch
Testing:
PHPUnit, Jest, Vitest, Testing Library, Playwright
Tooling:
Git, GitHub, NPM / Yarn, Composer, Webpack, ESLint, Prettier
AI-assisted development: Claude Code, MCP, agents, agentic coding CLI tools, AI PR review
GenAI Ecosystem:
OpenAI GPT, Anthropic Claude, Google Gemini (Vertex AI), Amazon Bedrock, open-weight models (DeepSeek, Llama)
Embeddings, RAG, vector stores, prompt engineering, tool use / function calling, streaming
Nice to Have
Experience with
Python
(scripting, data processing, ML/AI services).
Experience deploying on
Vercel
or similar hosting platforms.
Knowledge of
Terraform
and multi-account AWS setups.
Familiarity with
monorepos
and modular architectures.
Exposure to
Figma
or other design tools.
Data engineering and analytics experience (
Snowflake
, SQL Server, ETL).
Feature flags and observability (LaunchDarkly, New Relic, Microsoft Clarity, Matomo).
Domain knowledge in healthcare, life sciences or medical education.
Other cloud platforms such as Google Cloud or Azure.
Perks & Benefits of Joining Our Team at PSL Mexico
⚕️ Private Health Insurance
International Exposure
Agile Organization
13th-Month Salary (Aguinaldo)
Savings Fund
️ Food Vouchers
Flexible Home Office – Come to the Office at Your Best Convenience
️ 12 Vacation Days After Your 3-Month Anniversary
Tuition Reimbursment

📌 Senior Application Developer (México)
🏢 PSL Group
📍 México