Responsibilities

We are looking for a Senior Python Engineer to play a key role in building the core of our AI platform. In this position, you will design and develop production-grade systems that power intelligent automation, agentic workflows, and large-scale retrieval services. This is a highly technical, hands-on role that involves close collaboration with product and platform teams to transform advanced AI concepts into reliable, scalable, and secure solutions used across our enterprise ecosystem. You will also be responsible to:

• Design, build, and maintain AI-powered services and APIs, leveraging LLMs (OpenAI, Anthropic, Qwen, OSS models) and custom ML models.

• Develop an enterprise-grade agentic framework that enables orchestration, retrieval, and collaboration between multiple AI agents.

• Implement and optimize knowledge retrieval systems and agentic search capabilities using vector databases such as Qdrant and ElasticSearch.

• Write well-structured, efficient, and testable Python code for production services, experimentation, and internal developer tools.

• Build and maintain shared Python libraries and SDKs used across multiple applications and microservices.

• Collaborate with cross-functional teams on architecture, internal protocols, and API standards to ensure consistency and reliability across the platform.

• Develop and enhance monitoring, validation, and observability for production-grade AI solutions.

• Drive the full software development lifecycle - from design and implementation to deployment, monitoring, and continuous improvement.

• Identify and resolve performance bottlenecks, reliability issues, and scaling challenges in complex, data-intensive environments.

• Participate in code reviews and technical discussions, mentoring other engineers and contributing to a culture of excellence.

Example Projects

• Building an evaluation and observability framework for AI model performance and reliability.

• Developing an agentic orchestration platform that enables collaboration among multiple AI agents and tools.

• Implementing semantic retrieval and agentic search capabilities over large enterprise knowledge bases.

• Designing AI services that process and reason over high-volume real-world data at scale.

Requirements

Qualifications / Experience / Technical Skills

• Bachelor’s or Master’s degree in Computer Science, Engineering, or a related field, or equivalent practical experience.

• 5+ years of experience as a Software Engineer, with strong proficiency in Python.

• Proven track record of building and maintaining production-grade systems using Python.

• Strong understanding of distributed systems, API design, and data-driven architectures.

• Experience with relational and non-relational databases (PostgreSQL, Elastic, Qdrant, or similar).

• Familiarity with AI/ML system design, including LLM integration and evaluation pipelines.

• Knowledge of DevOps and observability practices (CI/CD, monitoring, metrics, and model validation).

• Python • FastAPI • LLM APIs (OpenAI, Anthropic, Qwen, OSS) • LiteLLM • Qdrant • PostgreSQL • ElasticSearch • Langfuse • Kubernetes • GitHub Actions • ArgoCD

Preferred Skills

• Experience working with multiple LLM providers (OpenAI, Anthropic, Qwen, open-source models).

• Background in developer platforms or AI infrastructure services.

• Familiarity with vector databases, semantic retrieval, and knowledge graph architectures.

• Exposure to Langfuse, LiteLLM, LangChain, or similar frameworks.

• Experience developing enterprise-scale SaaS or distributed backend systems.

• Contributions to open-source projects in Python, AI, or infrastructure engineering.

Soft Skills / Personal Characteristics

• Excellent communication skills, with the ability to convey complex technical ideas clearly to both technical and non-technical audiences.

• Collaborative and proactive approach, comfortable working across teams in a dynamic environment.

• Strong analytical and problem-solving abilities, with a focus on continuous improvement and innovation.

• Curiosity and a genuine interest in emerging AI technologies and modern backend architectures.

(REQ ID: 2459)

**We only consider candidates based in Spain. We do not manage VISA/Sponsorship.**

Lynx Financial Crime Tech  está buscando un/a Software Engineer (Python)

POR QUÉ DEBERÍAS CONSIDERAR ESTA OPORTUNIDAD

En Lynx Financial Crime Tech S.A, somos una empresa de software basado en IA especializada en detectar y predecir patrones de comportamiento. Dirigida por un equipo experto del sector financiero y académico, desarrollamos e implementamos tecnologías de IA de vanguardia y autoaprendizaje. Nuestra plataforma destaca en tecnologías de procesamiento de transacciones de baja latencia y está disponible tanto in situ como en la nube.

Damos prioridad a la VISIÓN, la AGILIDAD y la VELOCIDAD para ofrecer experiencias de cliente excepcionales y hemos establecido relaciones duraderas y de confianza con algunas de las principales instituciones financieras, fintechs y empresas comerciales de todo el mundo.

Adoptamos una sólida cultura de riesgos y esperamos que todo nuestro equipo, independientemente del puesto que ocupen, tengan una actitud proactiva y responsable hacia la gestión de riesgos.

Lynx se enorgullece de ser una organización en la que hay igualdad de oportunidades independientemente de la identidad de género, la cultura y la discapacidad. Nuestra misión es contribuir a que más personas y empresas prosperen.

QUÉ HARÁS EN TU TRABAJO

Como Software Engineer (Python) tu objetivo será participar en el desarrollo de una herramienta de AML basada en inteligencia artificial, Big Data y Procesamiento en tiempo real.

Necesitamos a alguien como tú para que nos ayude en distintos ámbitos:

• Análisis de requerimientos y participación en el diseño de soluciones.
• Participación en el desarrollo y mantenimiento de una aplicación cloud innovadora en el área de detección de AML en entornos financieros.
• Análisis y mejoras de rendimiento/velocidad del sistema
• Testing para asegurar correcto funcionamiento de los desarrollos.
• Elaboración de casos de prueba.
• Diagnosis de incidencias y correcciones.
• Mejoras y buenas prácticas en el uso de repositorios y herramientas de desarrollo software.

EXPERIENCIA

-     +2 años desarrollando en Python

EDUCACIÓN

-     Ingeniería Informática, de software o carreras similares.

HABILIDADES & CONOCIMIENTOS

• Conocimiento consolidado y buenas prácticas en programación en lenguaje Python.
• Conocimiento de programación de APIs RESTful.
• Tests automáticos en Python.
• Programación en Python de acceso a bases de datos Elasticsearch y SQL.
• Conocimientos en Docker.

QUE OFRECEMOS  

En Lynx desarrollamos tecnología avanzada para la prevención del fraude y la lucha contra el blanqueo de capitales (AML), ayudando a organizaciones globales a tomar decisiones en tiempo real mediante analítica avanzada e inteligencia artificial. 

Ofrecemos un entorno internacional y especializado donde podrás crecer, innovar y desarrollarte con propósito, contribuyendo a un sistema financiero más seguro y transparente. 

Cuidamos de tu bienestar con nuestro programa Wellbeing, seguro médico, seguro de vida, y acceso a Wellhub. 

Impulsamos la flexibilidad con un modelo híbrido y colaborativo, ticket restaurant y medidas de apoyo familiar. 

Además, potenciamos tu crecimiento con formación especializada y oportunidades de carrera en un ecosistema tecnológico global centrado en datos e IA aplicada a fraude y AML. 

OTRA INFORMACIÓN

• Nivel de inglés fluido (B2).
• Uso de repositorios en
• Deseable conocimientos y certificaciones en AWS.
• Programación con lenguajes de scripting: Bash

Si quieres conocernos más, visita nuestra web https://lynxtech.com/

This is Adyen

Adyen provides payments, data, and financial products in a single solution for customers like Meta, Uber, H&M, and Microsoft - making us the financial technology platform of choice. At Adyen, everything we do is engineered for ambition. 

For our teams, we create an environment with opportunities for our people to succeed, backed by the culture and support to ensure they are enabled to truly own their careers. We are motivated individuals who tackle unique technical challenges at scale and solve them as a team. Together, we deliver innovative and ethical solutions that help businesses achieve their ambitions faster.

Financial Products

Adyen is expanding beyond payments by building an entire suite of embedded financial services tailored for platforms, marketplaces, SaaS businesses, on-demand platforms, and crowdfunding platforms. Our team’s mission is to enable these platforms to manage their global payments and financial services seamlessly through API integrations or hosted solutions.

With our solutions, platforms can:

• Run onboarding, verification, and compliance processes across multiple markets.
• Manage payments and trigger faster payouts and bank transfers in all preferred currencies.
• Offer value-added services like capital lending and the issuing of payment cards and bank accounts.

Our team is responsible for developing the technology behind this unified platform, focused on several different areas.

Your role:

• You will build and maintain our distributed high-performance platform.
• You will contribute to architectural design decisions and ensure the scalability of our platform.
• You will help develop teammates, mentoring and coaching junior engineers and peers while maintaining a feedback loop to foster both your and their continuous growth.
• You will be part of a diverse and inclusive team. 
• We launch fast and iterate often. Concretely, this means that within your first few weeks, you will bring code live that impacts many businesses and shoppers.
• You will identify and improve parts of the platform to make it more robust and scalable.
• Collaborate across teams and time zones to make things happen, review code and be open to feedback.
• As an engineer you will help our core financial data processes and work on our finance infrastructure, to keep it scalable, reliable and secure.

Who you are:

• A Senior Software Engineer with experience working with object-oriented programming languages (Java).
• You enjoy and have previous experiences mentoring (not managing) developers.
• You have a deep understanding of the why, how, and where of architectural software design. 
• You are proficient in creating performance database queries and table structures.
• You are a clear and concise communicator capable of articulating complex, technical concepts to both junior developers and non-technical peers.
• You are flexible, a team player, and someone who understands the bigger picture.
• You are able to take ownership and lead a project.
• We are an international team and our working language is English, so you speak it fluently in both technical and non-technical contexts.
• Our Tech Stack: Java 17, Web Services (RESTful) and SQL/PostgreSQL using MyBatis (ORM),  Tomcat, Gradle, CockroachDB and Elasticsearch.

Our Diversity, Equity and Inclusion commitments 

Our unique approach is a product of our diverse perspectives. This diversity of backgrounds and cultures is essential in helping us maintain our momentum. Our business and technical challenges are unique, and we need as many different voices as possible to join us in solving them - voices like yours. No matter who you are or where you’re from, we welcome you to be your true self at Adyen. 

Studies show that women and members of underrepresented communities apply for jobs only if they meet 100% of the qualifications. Does this sound like you? If so, Adyen encourages you to reconsider and apply. We look forward to your application!

What’s next?

Ensuring a smooth and enjoyable candidate experience is critical for us. We aim to get back to you regarding your application within 5 business days. Our interview process tends to take about 4 weeks to complete, but may fluctuate depending on the role. Learn more about our hiring process here. Don’t be afraid to let us know if you need more flexibility.

This role is based out of our Madrid office. We are an office-first company and value in-person collaboration; we do not offer remote-only roles.