Role description

AWS Application Developer - Spain

We are still looking for the very Top Talent… and we would be delighted if you were to join our team!

More in detail, UST is a multinational company based in North America, certified as a Top Employer and Great Place to Work company, with over 35,000 employees worldwide and presence in more than 35 countries. We are leaders in digital technology services and provide large-scale technology solutions to big companies.

We are building an AI-native internal developer platform for a leading financial services client: the paved road that lets every engineering team build applications with AI agents as first-class developers, with governance and automation built in. The platform is greenfield and already in use, and we are looking for a hands-on senior engineer to help shape it from the ground up.

What we look for?

We are looking for an AWS Application Developer to build the self-serve platform, quick starts and governance checks behind this developer platform.

100% remote position for people located in Spain.

Key Responsibilities:

- Build the self-serve platform: control plane services, APIs, the CLI, and integrations with AWS, GitHub, Entra, Snowflake and core systems.
- Build quick starts and reusable skills that define best-practice application development, used by both the platform team and teams building on top of it.
- Build operational and governance checks, both deterministic scripted checks and agentic applications, that keep applications compliant without manual gatekeeping.
- Work with engineering teams across the firm to define the patterns, guardrails and paved paths that AI agents follow when building applications.
- Develop serverless AWS applications and tools using Lambda, API Gateway and Step Functions, together with GitHub Actions and Infrastructure as Code.
- Automate the software delivery lifecycle and engineering controls,



and raise platform quality through code review, test automation, observability and documentation.

Mandatory requirements:

- English C1 (required).
- Strong application-development experience, enough to define how applications should be built well and encode that as patterns and quick starts.
- Strong AWS application development and software engineering experience, ideally on developer tooling, delivery platforms or cloud-native developer workflows.
- Daily use of AI-assisted engineering, working with a coding agent or harness. Experience with spec-driven development is a strong plus.
- Solid knowledge of AWS serverless and event-driven services: Lambda, API Gateway and Step Functions.
- Experience automating CI/CD, SDLC and engineering controls with GitHub Actions and Infrastructure as Code.
- Experience building automated governance, compliance or operational controls into delivery pipelines.
- Good engineering practice as second nature: API design, automated testing, observability, documentation and secure-by-default delivery.

Nice to have:

- Python/FastAPI for building production APIs and services.
- TypeScript/React for web front ends and developer consoles.
- Experience building internal developer platforms or "platform-as-a-product".
- Experience building agentic applications, or designing APIs, CLIs and reusable skills for human and agent consumers.
- Financial services or other regulated-industry experience.

Skills: AWS, AWS Lambda, AWS Step Functions, API Development, Amazon API Gateway, Event-Driven Architecture





What can we offer?

- 23 days of Annual Leave plus the 24th and 31st of December as discretionary days!
- Numerous benefits (Health Care Plan, Internet Connectivity, Life and Accident Insurances).
- "Retribución Adaptable" Program: (Meals, Kindergarten, Transport, online English lessons, Health Care Plan…)
- Free access to several training platforms
- Professional stability and career plans
- UST also compensates referrals, so you could benefit when you refer professionals.
- The option to pick between 12 or 14 payments along the year.
- Real Work Life Balance measures (flexibility, WFH or remote work policy, compacted hours during summertime…)
- UST Club Platform discounts and gym access discounts

If you would like to know more, do not hesitate to apply and we'll get in touch to fill you in on details. UST is waiting for you!

In UST we are committed to equal opportunities in our selection processes and do not discriminate based on race, gender, disability, age, religion, sexual orientation or nationality. We have a special commitment to Disability & Inclusion, so we are interested in hiring people with disability certificate.

Skills

AWS, AWS Lambda, AWS Step Functions, API Development, Amazon API Gateway, Event-Driven Architecture

About UST
UST is a global digital transformation solutions provider. For more than 20 years, UST has worked side by side with the world’s best companies to make a real impact through transformation. Powered by technology, inspired by people and led by purpose, UST partners with their clients from design to operation. With deep domain expertise and a future-proof philosophy, UST embeds innovation and agility into their clients’ organizations. With over 30,000 employees in 30 countries, UST builds for boundless impact—touching billions of lives in the process.

📌 AWS Application Developer (Madrid)
🏢 Ust
📍 Madrid