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Staff Backend Engineer

Remote, Barcelona·Full-time·Added 9 months ago (last checked 20 Oct)

Agency

Fledge

8 open roles

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Our summary

Work mode: Remote (Barcelona)
Contract: Full-time
Relocation: Full relocation support
Spanish: Fluent
English: Required
Experience: Senior level

Visa options

Fledge sponsors work visas
Stated in the ad: “Relocation support and Visa Sponsorship”

More jobs with visa sponsorship

Skills

Nice to have

Requirements

What we're looking for

Expert-level proficiency in Python with extensive experience in Django, Django Channels, FastAPI, ASGI, and async programming.
Strong system design skills and ability to articulate technical trade-offs.
Proven skills in building scalable backend systems handling 100+ concurrent AI workflows with low latency.
Deep knowledge of LLMs, including prompt engineering, chaining, caching, fine-tuning, and usage of open-source (Llama, Mistral) or closed-source models (OpenAI, Anthropic).
Experience with retrieval-augmented generation (RAG), vector databases, and semantic search implementations.
Familiarity with AI agentic frameworks, multi-agent orchestration, planning, and reasoning systems.
Hands-on experience integrating speech-to-text, text-to-speech, telephony (Twilio, IVR), and voice activity detection into production systems.
Proficiency with AI-assisted development tools and ability to deliver full-stack features (backend + frontend) efficiently.
Good frontend skills with JavaScript/TypeScript and React (AI-assisted vibe coding).
Understanding of asynchronous message queues (Celery, RabbitMQ/Redis) and data storage technologies (PostgreSQL, Redis).
English and Spanish fluency

Nice to have

Great communicator: You can help clients understand the value we bring and help our team better understand our clients
Resilience: You can ride the ups and downs of the job and stay balanced through it all
Results-based: You own the outcome
Team player: You put the team before yourself
Organized: You can keep track of your workload and ensure critical things are not missed
Experience with DevOps practices: CI/CD pipelines, containerization (Docker), cloud platforms (AWS, Azure).
Knowledge of production monitoring, logging, alerting, and security best practices for enterprise B2B AI solutions.
Familiarity with multi-modal conversational interfaces and fallback mechanisms for robust production deployment.
Passion for working in fast-paced startup environments with a hands-on, ownership-driven mindset.

Pay & benefits

What you'll get

Top of the market salary
Equity plan
Remote policies
Relocation support and Visa Sponsorship

The role

We are seeking a Staff Backend Engineer to join an elite team of industry leaders building an AI platform tailored for the HR sector. You will be the technical architect and backbone of the intelligent HR platform. You will focus on the backend development with Python/Django and the design of scalable AI-native architectures to orchestrate complex, autonomous recruitment workflows. You will leverage cutting-edge AI-assisted development tools, such as Cursor and Claude Code, to prototype and ship complete, full-stack features rapidly with minimal handoffs.

This is an opportunity to build production-grade conversational AI systems that integrate LLMs, build our agent framework, use real-time voice and telephony interfaces, and enable zero-touch recruitment automation.

Lead the development of full-stack solutions, from designing intuitive user interfaces to crafting robust backend systems.
Collaborate with cross-functional teams, including AI researchers and data scientists, to seamlessly integrate AI models into user-centric applications.
Architect scalable, maintainable systems that support the company's rapid growth and mission to make a meaningful environmental impact.
Drive innovation by exploring and implementing modern frameworks, APIs, and cloud solutions.
Mentor and support junior developers, fostering an environment of collaboration and technical excellence.
Automate and optimize systems to deliver faster, more efficient solutions to both users and internal teams.

About Fledge

Fledge is a talent acquisition and recruitment firm focused on tech companies, helping VC-backed startups find niche tech talent across Europe and the US. The company describes itself as taking a sustainable, holistic approach to hiring, aiming to build teams that grow with the company rather than just filling roles. Fledge operates as Fledge EURL, a French entity (VAT FR62894453539).

Fledge's careers page lists open roles in Spain for engineers and product designers, but these appear to be positions at client companies rather than Fledge's own internal hires. The company's website does not provide details about a physical office in Spain or its work culture there. For international professionals, Fledge's relevance lies in its role as a recruiter connecting candidates with tech opportunities in Spain, though specific information about its local operations is limited.

Industry: Recruitment
Website: fledge.net

In their own words

About the company & team

We are a boutique Talent search firm connecting exceptional Talent with the most innovative companies in the AI and software development industries across EMEA. Our clients are among companies with innovative products that have a positive impact on our societies, and we present them with a solution model between fine consulting and flexible recruitment process outsourcing :

Fractional Talent Acquisition Advisory
Recruitment operation tools
On-demand Talent sourcing expertise

Additional information

We are committed to enabling everyone to feel included and valued, and we trust our partners to do the same. Both the company and its culture are strongest when composed of diverse experiences and backgrounds.

All qualified applicants will receive consideration for employment without regard to age, color, family, gender identity, marital status, national origin, physical or mental disability, sex (including pregnancy), sexual orientation, or any other characteristic protected by applicable laws.

If you have a medical condition or an individual need for an adjustment to our process, and you believe this may affect your ability to be at your best, please let us know so we can discuss how we can best support you and make any necessary adjustments.

In case of any doubts or questions, please contact here: dhamelyz@fledge.net

All open roles at Fledge