Senior Full Stack Engineer (AI SaaS) - Fully Remote in Łódź at Sowelo Consulting sp. z o.o. sp. k.

Do you love shipping full-stack features fast and seeing them used by real customers within days, not months?

Do you want to help shape zero-to-one AI products rather than just maintaining someone else’s legacy stack?

Great! Read on as we have a role for you!

We are seeking a Senior Full Stack Engineer to design, build, and ship AI-forward SaaS products that power professional video and film production workflows. You will work across the stack from modern React-based frontends to Node.js backends and cloud infrastructure, integrating leading text, image, and video models into real-world products used by creative teams. This role is hands-on, fast-paced, and outcome-driven, with a focus on quickly delivering features that measurably improve customer and business metrics.

In this position, you’ll own your work end-to-end: collaborating with product managers on specs, implementing and deploying features, and validating quality through your own testing and iteration. You’ll be expected to move with high velocity, mentor other engineers by sharing your practices and patterns, and help shape zero-to-one products in an environment that embraces experimentation, rapid learning, and continuous improvement.

This is a Fully Remote Role within Poland on a B2B contract.

The Salary for this role can go up to 460,000 PLN per year

Your duties will include:

• Design, develop, and deploy full-stack features and services using React, Node.js, and cloud-native technologies.
• Integrate and orchestrate leading text, image, and video AI models into production workflows for creative teams.
• Collaborate closely with product managers to translate customer problems and requirements into clear, testable solutions.
• Own features end-to-end, including implementation, automated testing, QA/UAT, deployment, and monitoring.
• Proactively identify, scope, and ship high-impact experiments that drive customer value and business outcomes.
• Maintain a high standard of code quality, reliability, and performance in a fast-paced, iterative environment.
• Troubleshoot, debug, and resolve production issues, improving system resilience and observability over time.
• Mentor and support other engineers by sharing best practices, patterns, and tooling that increase team velocity.
• Contribute to improving the SDLC/PDLC processes, including code review, release practices, and documentation.
• Collaborate with cross-functional teams (engineering, product, design, operations) to deliver cohesive, user-centric solutions.

To be a good fit for the Senior Full Stack Engineer role, you will have:

• 5+ years of professional experience as a full stack engineer, including shipping production web applications.
• Strong proficiency with modern JavaScript/TypeScript and a front-end framework (ideally React) plus experience with Node.js on the backend.
• Experience with AI tools to increase productivity, enhance code quality and automate tasks
• Hands-on experience building and consuming RESTful APIs and working with databases (e.g., MongoDB or similar NoSQL/SQL datastores).
• Demonstrated ability to own features end-to-end: from scoping and implementation through testing, deployment, and monitoring.
• Solid understanding of software engineering best practices: version control, code reviews, automated testing, CI/CD, and observability.
• Experience working with cloud platforms (AWS or equivalent) and common DevOps practices for deploying and maintaining services.
• Proven track record of delivering quickly in a fast-paced environment and iterating based on user feedback and metrics.
• Strong communication skills and comfort collaborating with product managers, designers, and other engineers.
• Growth mindset with a focus on mentorship, knowledge sharing, and continuously improving team velocity and quality.

Nice to Have:

• Experience with image, video, or generative AI model APIs in real products.
• Background in the film, video, or advertising industry, or familiarity with professional creative workflows.
• Experience with prompt chaining or orchestrating multiple AI services into cohesive user workflows.
• Demonstrated leadership in guiding small teams, projects, or technical domains.
• Familiarity with design systems or strong product/design sensibilities.

Our client offers:

• B2B contract with a salary range between 290,000 - 460,000 PLN per year (salary offered will be dependant on the outcome of the interview)
• Fully Remote Role
• Work on an AI-first product focused on real professional use cases, not consumer gimmicks.
• Direct impact on how creative teams plan and produce video content end-to-end.
• High-ownership IC role where you ship fast, experiment often, and see your work in production quickly.
• Opportunity to build zero-to-one features and help define product direction, not just maintain legacy systems.
• Modern tech stack (React, Node.js, cloud-native, modern AI model APIs) with room to influence architecture.
• Strong engineering culture that values velocity, quality, and continuous improvement in SDLC/PDLC.
• Mentorship and growth opportunities, including the chance to uplevel team practices and lead initiatives.
• Close collaboration with product and creative stakeholders, giving you direct exposure to user needs and feedback.

Sounds interesting? Send us your CV by applying to this page

The provision of personal data by you is fully voluntary and the basis for their processing is your consent. We have prepared some necessary information, you can find in document: "Information regarding the processing of your personal data". There you will find how your Personal Data is being processed and what your rights are in connection to this.

The personal data will be processed by Sowelo Consulting spółka z ograniczoną odpowiedzialnością with its registered seat in Cracow (LLC) registered in National Court Register (KRS) under no. 0000671136, our Employees and Subcontractors (jointly referred to as the Company).

Sowelo Consulting sp. z o.o. (LLC) is entered in the register of employment agencies under the number: 35288

Our candidate selection process relies entirely on human judgment. We explicitly avoid using automated screening algorithms or AI-driven scoring systems for any part of the assessment. Every single profile is reviewed personally by our experienced recruiters, ensuring a thorough and unbiased consideration of your fit.

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