CrawlJobs Logo
Payhawk Logo Payhawk · IT - Software Development

Full-Stack AI Engineer

Bulgaria, Sofia · Job Posted February 14, 2026
Apply Position
Job Link Share

Job Description

As part of our Efficiency team, you will upskill and uplift every role with AI‑powered tools - automating workflows and building secure, reliable assistants, agents, and role “digital twins.” Just like broader Payhawk we obsess over customer success, our customers are every Hawk and every Payhawk customer, and we measure impact by adoption, task success, and time saved. We design human‑centered AI and manage risk responsibly. You’re a product‑minded software engineer who designs and ships end‑to‑end AI solutions: chat UIs, APIs, orchestration, data pipelines, retrieval, evals, and guardrails. You love jumping between frontend, backend, prompts, schemas, observability, and Kubernetes to deliver measurable time savings for Hawks.

Job Responsibility

  • Build UI + backend for chat/agent experiences
  • own discovery → shipping → monitoring
  • Orchestrate tool‑using agents via MCP
  • design safe tool APIs and connectors
  • Implement and iterate RAG / Hybrid RAG (dense + BM25) with quality evals (faithfulness, groundedness, latency)
  • manage prompt & retrieval versioning
  • Data work: build ingestion/ETL, chunking/metadata, access‑aware retrieval
  • ensure lineage and governance
  • Reliability: tracing, cost & latency SLOs, autoscaling
  • CI/CD with quality gates (offline/online LLM evals)
  • UX & prompts: craft conversational flows using People + AI Guidebook patterns
  • instrument analytics and A/Bs for task success and satisfaction
  • Security & risk: apply applicable security standards such as (but not limited to) NIST AI RMF guardrails
  • work with Security/Legal on data handling and auditability

Requirements

  • 4+ years experience
  • expert in Node.js/TypeScript/React/PostgreSQL
  • CI/CD & cloud (GCP/K8s)
  • Shipped LLM apps (agents, function/tool use, retrieval)
  • strong API design & data modeling
  • Comfortable with Python for data/ETL
  • vector stores
  • analytics instrumentation
  • Bachelor's degree in Computer Science (or related field)
  • Experience with agile processes, continuous delivery, and continuous integration
  • Ability to multitask, organize, and prioritize work
  • Exceptional integrity and work ethic

Nice to have

  • Frontend experience
  • Kafka
  • experimentation platforms
  • prior experience with MCP servers/clients

What we offer

  • Competitive compensation package based on experience
  • 30 days holiday paid leave
  • One week exchange policy to another Payhawk office (London, Berlin, Barcelona, Paris, Amsterdam and Vilnius)
  • Flexible working hours and opportunity to work from home
  • Regular team-wide events
  • Additional medical care
  • MultiSport card fully funded by us
  • Company office massages
  • Personal assistant service
  • Opportunity to use the Payhawk product
Payhawk - All Job Offers

Looking for more opportunities?

Search for other job offers that match your skills and interests.

Suggested Tags: Frontend Developer Secretary Talent Manager Salesforce Administrator Data Analyst
Similar Jobs for

Full-Stack AI Engineer

8 matching positions

Senior Applied AI Full-Stack Engineer

Location
Location
Canada , Mississauga
Salary
Salary:
120800.00 - 170800.00 USD / Year
https://www.citi.com/ Logo
Citi
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • 6+ years' hands-on experience with Java and Spring Boot for building scalable microservices, and Angular 16+, TypeScript, JavaScript, HTML5, JSON, CSS, Web Sockets, and Ajax
  • Proven experience designing large-scale internet/intranet platforms using microservices architecture
  • Strong fundamentals in systems analysis, design patterns, and SDLC, including unit testing and CI/CD practices
  • Ability to produce high-level and low-level design artefacts (sequence diagrams, class diagrams)
  • Proficiency in Python for scripting, automation, or AI-adjacent tooling
  • Hands-on experience with MongoDB
  • solid understanding of modern database design and data modelling
  • Good understanding of message brokers
  • Kafka experience highly desirable
  • Demonstrated, hands-on proficiency with AI coding tools (e.g., Claude Code, Cursor, GitHub Copilot, or equivalent)
Job Responsibility
Job Responsibility
  • Design and build large-scale internet/intranet web application platforms on microservices architecture, owning decisions across the full stack — from Angular frontends to Java/Spring Boot backends and MongoDB data layer
  • Lead system design at both high and low levels, producing artefacts such as sequence diagrams, class diagrams, and data models, while ensuring security, scalability, and performance are built in from the start
  • Leverage AI coding agents (e.g., Claude Code, Cursor, Devin) for code generation, debugging, and routine tasks
  • engineering high-quality context (repository structure, API specs, Jira tickets) to maximize the accuracy and reliability of AI output
  • Critically review, validate, and take ownership of all AI-generated code ensuring structural integrity, security compliance, and production readiness before anything reaches deployment
  • Integrate agentic workflows into CI/CD pipelines
  • manage multiple workstreams concurrently through intelligent delegation to AI agents
  • Act as a player/coach within small, co-located squads — hands-on in delivery while actively upskilling junior engineers to become effective AI-first practitioners
  • Apply a strong functional understanding of Corporate Banking to ensure solutions address real business outcomes, not just technical requirements
  • Fulltime
Read More
Arrow Right

Senior Full-Stack AI Engineer

PhantomBuster is a web automation SaaS that allows businesses to grow faster. We...
Location
Location
France , Bordeaux
Salary
Salary:
Not provided
phantombuster.com Logo
PhantomBuster
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • 5+ years of software engineering experience
  • Strong Full-Stack engineering skills: agentic AI, UX, nodeJS, TS (AWS as a plus)
  • Comfortable working on backend systems and databases
  • Strong problem-solving and communication skills
  • Ability to contribute to technical and architectural discussions
  • Product-oriented mindset with high ownership
  • Comfortable operating in fast-moving environments
  • Startup or product-company experience is a strong plus
  • Interest in AI systems, tooling, or conversational interfaces is a plus
Job Responsibility
Job Responsibility
  • Build and ship product features end-to-end
  • Work across frontend, backend, APIs, and databases
  • Develop interfaces and workflows using TypeScript, Node
  • Contribute to agentic system
  • Participate in architecture and technical design discussions
  • Provide technical feedback and help shape implementation decisions
  • Collaborate closely with Product and Engineering teams
  • Improve internal developer tooling and platform reliability
  • Contribute to rapid product experimentation and iteration
What we offer
What we offer
  • International team
  • Fun team building events
  • €40/month for remote work
  • Flexible working time
  • Home office budget up to €1500
  • 100% of an Alan Blue subscription (french-based contracts)
  • Lunch vouchers - €8 (50% The Phantom Company) / worked day (french-based contracts)
  • Partnership with MokaCare
  • €70 a month benefit for entertainment expenses
  • Book Allowance and Sharing Program
  • Fulltime
Read More
Arrow Right

Junior/ Middle Full-stack Engineer (AI assisted workflow)

We are currently forming a pre-qualified talent pool and will move forward with ...
Location
Location
Ukraine
Salary
Salary:
Not provided
softermii.com Logo
Softermii
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • 2+ years of experience as a software developer
  • Experience with JavaScript (React or Angular) and backend technologies (Node.js, or .NET)
  • Proficiency in spoken English
  • Understanding of business logic and ability to implement features
  • Ability to break down requirements into clear technical tasks and identify edge cases
  • Knowledge of unit and integration tests
  • ability to spot gaps and overfitted tests
  • Familiarity with SOLID principles and Clean Code practices
  • Ability to verify AI-generated code through logical checks and simple questions
  • Awareness of AI limitations and potential errors
Job Responsibility
Job Responsibility
  • Assist in validating AI-generated code and outputs, learning to check correctness efficiently
  • Analyze and break down business requirements into technical tasks
  • Implement frontend and backend features, collaborating with AI-assisted suggestions
  • Write meaningful tests (unit, integration) to check logic and detect obvious gaps
  • Identify simple edge cases and prevent misleading or overfitted tests
  • Follow Clean Code practices and basic architectural principles (SOLID, patterns)
  • Participate in discussions about design and architecture under guidance
  • Learn and improve engineering practices within an AI-assisted workflow
What we offer
What we offer
  • Stable and highly-functioning processes
  • Independence to make decisions that can affect the project and company
  • Team of like-minded experts
  • Individual development plan
  • Mentoring from seniors and leaders
  • Referral bonus
  • 21 paid vacation days
  • 11 paid days off for Public Holidays
  • 5 paid sick leave days per year
  • Volunteer support
  • Fulltime
Read More
Arrow Right

Full-Stack Engineer – AI Agent Platform

Shape the future of trust in the age of AI. At Oscilar, we're building the most ...
Location
Location
United States , Palo Alto
Salary
Salary:
Not provided
oscilar.com Logo
Oscilar
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • 4+ years of experience as a Full-Stack or Backend Engineer (TypeScript, Python, React, Node, or similar)
  • Proven ability to take products from zero to one in fast-moving environments
  • Strong understanding of distributed systems, system design, and cloud-native architectures (AWS / Kubernetes / modern CI/CD)
  • Curiosity and hacker mentality — you learn new tools quickly and aren’t afraid to dive deep
Job Responsibility
Job Responsibility
  • Design and build full-stack systems powering Oscilar’s next-gen AI agents — from backend APIs and data pipelines to fast, interactive frontends
  • Implement serverless architectures using AWS Lambda and Python for high-scale, event-driven processing of risk signals and fraud patterns
  • Experiment with agentic frameworks, LLM-driven automation, and reasoning systems to address fraud, risk scoring, and AML-related challenges
  • Collaborate directly with founders and product leaders to shape the architecture and roadmap of our agentic platform
  • Move fast — ship MVPs, test hypotheses with production data, and iterate weekly
  • Apply practical AI — using GenAI, embeddings, and retrieval pipelines for data storytelling, graph reasoning, and case automation
What we offer
What we offer
  • Competitive salary and equity packages, including a 401k
  • Remote-first culture — work from anywhere
  • 100% Employer covered comprehensive health, dental, and vision insurance with a top tier plan for you and your dependents (US)
  • Unlimited PTO policy
  • AI First company
  • both Co-Founders are engineers at heart
  • and over 50% of the company is Engineering and Product
  • Family-Friendly environment
  • Regular team events and offsites
  • Unparalleled learning and professional development opportunities
  • Fulltime
Read More
Arrow Right

Principal / Senior Full-Stack Engineer (AI Agents)

We are hiring 5–10 Full-Stack Engineers over the next 12 months to accelerate th...
Location
Location
United States , San Francisco
Salary
Salary:
225000.00 - 275000.00 USD / Year
g2i.co Logo
G2i Inc.
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • 10+ years of engineering experience
  • Strong experience in B2B SaaS environments
  • Full-stack background with a focus on TypeScript
  • Cloud experience with GCP (preferred) or AWS
  • Full-stack TypeScript (frontend + backend)
  • Strong system design and architectural skills
  • Experience with IaC, CI/CD, deployment workflows
  • Familiarity with LLMs and genuine enthusiasm for AI innovation
  • Extreme ownership: Takes responsibility for outcomes end-to-end
  • High agency: Proactively finds and solves the right problems
Job Responsibility
Job Responsibility
  • Design, develop, and maintain full-stack features using TypeScript
  • Build and optimize AI agents using state-of-the-art LLMs
  • Work with GCP (primary) or AWS, infrastructure-as-code, and deployment pipelines
  • Take full ownership of projects—from ideation and architecture to implementation and maintenance
  • Develop reusable tools, prompts, and frameworks for rapid agent creation
  • Proactively identify problems, propose solutions, and execute independently
  • Contribute to architectural decisions and engineering best practices
What we offer
What we offer
  • Meaningful equity, benchmarked against Pave and Color
  • Health, dental, and vision insurance (basic plan fully covered)
  • Commuter benefits (parking & train)
  • Catered meals and office snacks
  • High-impact role within a small, senior team
  • Fulltime
Read More
Arrow Right

Full-stack Engineer – Internal AI Platform

You will engineer the core of our proprietary internal platform that democratize...
Location
Location
Spain , Madrid; Valencia
Salary
Salary:
Not provided
groupon.com Logo
Groupon
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • Deep expertise in TypeScript, Node.js, Express, React, Next.js, and SQL
  • Practical knowledge of Docker, Kubernetes, and Linux environments
  • Hands-on experience with Chain of Thought (CoT), Agent building, and RAG concepts
  • An AI-First mindset: you already use Cursor or Claude Code and possess the engineering rigor to validate AI-generated code
  • Proven track record of shipping software to production
Job Responsibility
Job Responsibility
  • Develop and expand our internal AI platform, enabling internal teams to build autonomous AI Agents without deep ML expertise
  • Engineer Chain of Thought reasoning flows and integration layers that power agent logic
  • Build reliable, long-running AI Agent systems that handle failures at scale and prevent cascading outages when external LLM providers go down
  • Design node-based tools for intent retrieval, context management, and API routing
  • Program agent logic using TypeScript, Node.js, Express, React, Next.js, and SQL
  • Maintain a high bar for software quality and reliability while innovating at speed
  • Integrate AI-native tooling (Cursor, Claude Code) into your development workflow without sacrificing code quality
  • Fulltime
Read More
Arrow Right

Senior Full-Stack Engineer - Physical AI

At Encord, we're building the AI infrastructure of the future. One of the bigges...
Location
Location
United Kingdom , London
Salary
Salary:
Not provided
encord.com Logo
Encord
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • Experienced: have personally developed and maintained multiple systems from scratch
  • Seek high impact
  • Are a builder: enjoy all aspects of building a complete product, comfortable moving across the stack, enjoy problem solving and thinking from first principles, ready to pick up new skills and build quickly
  • Are comfortable with uncertainty: happy to tackle problems without a predefined clear definition or obvious solution
  • Are a team player: contribute best work and help others contribute their best
  • Open to learning technologies
  • Prior experience in Python and Typescript appreciated but not required
Job Responsibility
Job Responsibility
  • Solve problems of large scale efficient data transfer and storage
  • Solve problems of complex domain modelling
  • Apply the latest machine learning models
  • Squeeze performance out of web browsers
  • Rendering complex 3D scenes with thousands of objects while maintaining smooth frame rates
  • Work with the biggest names in robotics and autonomous vehicles
  • Understand the details of visual, spatial and sensor data, making sense of reality
  • Operate with high degrees of autonomy and be expected to craft at speed
  • Build performant, reliable and maintainable solutions to challenging problems - both technical and product
  • Be a key driver of progress on a core part of our product
What we offer
What we offer
  • Competitive salary, commission and equity in a hyper growth business
  • Strong in-person culture: most of our team is in the office 3+ days a week
  • Room to grow into anything you choose to
  • 25 days annual leave a year + public holidays
  • Unique opportunity to be part of a startup with a clear mission and vision
  • Get to explore and build services enterprise AI use cases across many different industry verticals such as healthcare, surveillance, retail, agriculture and many more
  • Work at the cutting edge of computer vision and deep learning, which also includes working on solving unsolved problems within those fields
  • Fulltime
Read More
Arrow Right

Senior Full-Stack Engineer - Physical AI

At Encord, we're building the AI infrastructure of the future. One of the bigges...
Location
Location
United States , San Francisco
Salary
Salary:
150000.00 - 300000.00 USD / Year
encord.com Logo
Encord
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • Experienced in developing and maintaining multiple systems from scratch
  • Comfortable with challenging front-end work (e.g., rendering complex 3D scenes)
  • Understanding of visual, spatial, and sensor data
  • Ability to work autonomously and craft at speed
  • Team player who contributes and helps others
  • Open to learning new technologies
  • Passionate and eager to learn
Job Responsibility
Job Responsibility
  • Building tools for the full Physical AI data stack
  • Solving problems of large scale efficient data transfer and storage
  • Complex domain modelling
  • Applying the latest machine learning models
  • Optimizing web browser performance
  • End-to-end ownership of projects
  • Working across the stack from deployment to styling
What we offer
What we offer
  • Competitive salary and equity
  • Real opportunities to grow
  • Strong in person culture
  • Flexible PTO
  • Annual learning and development budget
  • 18 paid vacation days + federal holidays
  • Opportunities for travel
  • Bi-annual off-sites and monthly socials
  • Health, dental and vision insurance
  • Fulltime
Read More
Arrow Right