Senior Full Stack Typescript Engineer (AI)

Kindgeek is looking for a full-stack engineer who takes an ambiguous business problem and carries it all the way to production, without waiting for a complete specification. Your mission will be to build features for an AI-native fintech product where deterministic logic owns every number and AI and ML components suggest, extract, and flag, but never decide. You'll work on one product deeply, as part of a small, senior team, with real ownership from day one.

As a Senior Full Stack Typescript Engineer (AI) you will be responsible for:

• Owning features end to end, from an ambiguous business problem through data model, API, workflow, and UI;
• Building typed backend services in Node.js and TypeScript, with relational data modeled in PostgreSQL;
• Designing asynchronous, event-driven workflows that handle retries, partial failure, and unreliable third-party services;
• Building or consuming AI-powered features, such as structured extraction, tool use, or drafting, always with validation and clear boundaries against deterministic logic;
• Integrating machine learning predictions into product surfaces, handling confidence, timeouts, and degraded responses without fabricating a value;
• Building interfaces people work in all day, such as review queues, forms, and multi-step flows, in React and Next.js;
• Writing meaningful tests and working with observability tools so behavior in production is something the team can verify, not assume.

We're looking for a Senior Full Stack Typescript Engineer (AI) who has:

• 5+ years of production experience with Node.js and TypeScript across the stack;
• Solid experience with PostgreSQL or another relational database, including schema design and migrations;
• Experience with typed API contracts, such as tRPC, GraphQL, or an equivalent, with runtime validation at the boundary;
• Experience with asynchronous or event-driven backend work, such as job queues or workflow engines;
• Production experience with React, including a modern framework such as Next.js;
• Practical experience with at least one shipped LLM-powered feature and a concrete failure mode you contained;
• Comfort consuming ML predictions in application code, with a real understanding of confidence and uncertainty;
• Experience writing meaningful tests and debugging issues in production;
• Comfort taking an ambiguous problem and making a decision under incomplete information;
• Strong spoken English and direct, low-ego communication with a US-based client team.

Will be a plus:

• Experience with agentic frameworks, RAG systems, or LLM evaluation and tracing tools;
• Experience with document processing, such as OCR, PDF parsing, or structured extraction;
• Experience with AWS infrastructure, CI/CD, SSO or SAML, or prior work in a regulated or high-trust domain.

We want you to thrive and feel supported

• Professional growth: at Kindgeek, we want our employees to grow and achieve ambitious professional goals. We support professional development with training and certification refunds and provide regular feedback and technical reviews.
• Benefits package: Kindgeek offers all team members competitive compensation and a benefits package that includes 18 working days of fully paid vacation, 10 compensated by 50% sick leaves without a note from the doctor, and an opportunity to take study leaves. Depending on how long you stay in the company, you can receive different health insurance packages from our partners.
• Personal growth: as a part of our team, you will have access to corporate English courses with a 50% reimbursement, take advantage of our offline library and access a large selection of corporate training and classes. Also, every employee can request any internal or external training or certification if it applies to his or her work responsibilities.
• Geek community: at Kindgeek, we value community – even in the full-scale invasion times, we take every opportunity to stick together. Our geeks organise various online and offline clubs – from stretching and skiing to English. We volunteer together and support each other.
• Flexibility: Kindgeek offers a hybrid working model. Team members can work remotely or from the office or Kindgeek London Hub – an innovative cafe-style co-working in Lviv (it's pet-friendly!).

At Kindgeek, we encourage everyone to apply – regardless of nationality, race, gender, marital status, disability, sexual identity, or religion. We are growing into an inclusive, equal-opportunity company where only professionalism, competence, and ideas matter. We are committed to supporting mobilised employees and veterans joining Kindgeek and facilitating their career development. We aim to bring equal opportunities to all team members and candidates – especially those underrepresented in technological companies.