Full Stack AI Engineer

With a legacy as a pioneer in the ALSP market, Factor leads the next evolution in legal services through AI-integrated contracting.

Factor is the market leader in Integrated Law , combining the expertise of Traditional Law, the efficiency of New Law, and the close business integration of In-house legal to deliver complex legal work at scale.

Factor works alongside corporate legal departments to solve for the ever-increasing demands and complexity of transactional legal work. Our "do while transforming, transform while doing" approach combines specialist expertise, AI-powered solutions, and business process knowledge to deliver better performance, better business and legal outcomes, and a transformed contracting experience.

Our clients span Fortune 500 companies including global banks, major pharmaceutical companies and large technology firms.

We believe that the more diverse our team becomes - in backgrounds, skills, experiences, and perspectives - the higher our creative potential as a company. We are dedicated to growing a diverse, inclusive company where individuals of all backgrounds thrive.

We are comprisedof more than 300 lawyers, legal specialists, technologists, and process consultants across Europe and North America - Join us!

Factor Law is hiring a Full Stack AI Engineer based in Belfast to build production-grade AI products for complex legal workflows. This is a hands-on engineering role for someone who can move confidently from backend architecture to frontend delivery, from document ingestion to user experience, and from prototype to production without waiting for detailed step-by-step instructions.

You will join a high-autonomy product and engineering environment building AI-powered tools that help legal teams work faster, more accurately and with more confidence. The work will sit at the intersection of contract intelligence, document processing, retrieval, AI orchestration, workflow automation, enterprise authentication, asynchronous jobhandlingand complex user interfaces.

This role is for a builder. We are looking for someone who can use AI-assisted coding tools aggressively and responsibly, particularly Codex, while still owning correctness, security,maintainabilityand production quality. The right person will use AI to move faster, not to cut corners.

• Build production services using Python,FastAPIandPydanticmodels.
• Develop APIs and backend workflows that support AI-enabled document and contract intelligence.
• Work with PostgreSQL,SQLAlchemyand Alembic to model, migrate andoperatereliable data layers.
• Build andmaintainasynchronous job systems, including queue processing, retries, idempotency, dead-letter handling, cancellation, progresstrackingand failure recovery.
• Use Redis for caching, transient state, jobstatusand coordination, with sensible reliability patterns such as timeouts, circuitbreakersand graceful degradation.
• Build React and TypeScript interfaces that consume backend services cleanly and provide users with transparent job states, useful errorhandlingand polished interaction patterns.
• UseTanStackQuery for server state, including query key factories, cache invalidation, optimisticupdatesand polling patterns for long-running AI jobs.
• Support document-heavy workflows, including ingestion, retrieval, structured extraction, redlining, rich texteditingand AI-assisted review.
• Build features that respect enterprise security expectations, including authentication, authorisation, secure datahandlingand auditability.
• Operate within Azure-based environments, including services such as Blob Storage, Key Vault, managed databases, Redis and containerised deployments.
• Instrument production systems using Application Insights or equivalent observability tooling.
• Use AI coding tools to accelerate implementation, debugging, refactoring,testingand documentation, whilemaintaininghigh code quality.
• Improve developer experience by reducing boilerplate, improving test coverage, simplifying localsetupand documenting repeatable patterns.
• Move fluidly between infrastructure and product delivery when needed.

• Minimum 3-5+ years of professional software engineering experience, or equivalent evidence of exceptional delivery.
• Strong production experience with Python andFastAPI.
• Strong working knowledge ofPydantic, PostgreSQL,SQLAlchemyand Alembic.
• Experience building React and TypeScript applications that consume real backend services.
• Demonstrable experience shipping production software, not only prototypes or internal scripts.
• Comfort working with asynchronous jobs, backgroundworkersor queue-based systems.
• Experience using Redis for caching, job status,stateor coordination.
• Practical experience with Docker and cloud-hosted deployments.
• Strong ability to debug across backend, frontend, database,authenticationand infrastructure layers.
• High fluency with AI-assisted coding tools such as Codex, Cursor, Claude Code or similar.
• Ability to work with ambiguity and make progress without waiting for perfect specifications.
• Clear ownership mentality, including follow-through on edge cases, tests, productionbehaviourand user impact.
• Legally eligible to work in the relevant location.

• Experience with Azure services, especially Blob Storage, Key Vault, managed PostgreSQL, managed Redis and containerised application hosting.
• Experience with enterprise authentication, especially Azure MSAL, OAuth/OIDC, token refresh, redirects and test-time auth bypasses.
• Experience with RAG, embeddings, vector search, document chunking, retrievalevaluationor LLM orchestration.
• Experience building legal tech, contract intelligence, documentautomationor professional services software.
• Familiarity with Radix UI,shadcn/ui, Tailwind CSS and design-token-first frontend systems.
• Experience with rich text or structured editing tools such asTipTap, Markdown editors or custom editor frameworks.
• Experience with Vite, code splitting, bundle monitoring, lazyloadingand performance optimisation.
• Experience with Application Insights,OpenTelemetryor similar production telemetry systems.
• Familiarity with secure software delivery in ISO-compliant or enterprise client environments.

• Chance to develop your career in an international, innovative company providing legal services to top brands worldwide;
• Opportunity to join an industry-leading executive team and over 300 lawyers, contract experts, technologists, and process consultants;
• Inclusive and nurturing work environment, where everyone's contributions are valued;
• Comfortable working hours with respect for work-life balance;
• Employment contract and employees' benefits package - MultiSport card, private medical care, group insurance, wellbeing platform;
• Remote (PL) or hybrid working model with a modern office located in the heart of Wroclaw.

As a member of an ISO Compliant center, the candidate will be required to follow the policies and procedures on Information Security Management System in place at the Center of Excellence and globally at Factor. As a member of the Factor team, the applicant will have access to various company and client assets and will be required to maintain the level of security as identified for each asset.

Factor is an Equal Opportunity Employer.

For more, visit: factor.law