Jobs Fullstack

Founding Engineer (Full-Stack / Real-Time AI Systems)

📍 San Francisco (preferred) | Remote (exceptional only)
 

🚀 TwinTone.ai

TwinTone is building AI Creators that live stream, sell products, and drive revenue 24/7.
 

We turn real creators into monetizable AI Twins powering:

• AI Live Shopping for brands
• Automated UGC distribution at scale
• AI-powered casino & iGaming live streams
 

We operate at the intersection of AI, real-time video, and commerce infrastructure.
 

• 2,000+ creators in our network
• 1.2B+ monthly distribution reach
• Growing SaaS + live-stream revenue
• US-based company, backed by angels + a16z Speedrun

We are now rebuilding our architecture properly to support real-time AI streaming at scale.

This is not a maintenance role - this is rebuild + scale + ownership.

What You’ll Do

• Own architecture across frontend + backend
• Rebuild and harden our system for real-time AI live streams
• Scale concurrent AI video sessions (low latency)
• Design event-driven systems for AI responses + video pipelines
• Improve reliability (AWS + Supabase + React + Java backend)
• Optimize LLM + video inference cost

Build features across:

• AI live casino streams (iGaming use cases)
• AI live shopping streams
• Creator onboarding + IP licensing
• Brand & partner dashboards
• Distribution + analytics engine
• Work directly with founder on roadmap and technical direction

• Hire and lead future engineering team

   

You will own the technical foundation of the company.

Tech Stack

Frontend: React + TypeScript, NextJS
Backend: Java
Database: Postgres (Supabase)
Infra: AWS EC2 + Global Accelerator

Bonus If You’ve Worked With

• Real-time streaming systems (WebRTC / RTMP / HLS)
• Event-driven architecture
• AI video / voice APIs
• High-concurrency systems
• Payments / marketplace architecture
• iGaming / betting infrastructure
• Large-scale content distribution systems

Who You Are

• Backend-leaning full-stack engineer
• Strong systems thinker
• Builder > talker
• Comfortable in early-stage chaos
• Opinionated about clean architecture
• Care deeply about latency, performance, and scalability
• Want to build a category-defining company

This is not a 9–5 role - This is a founder-level role.

What You Get

• Meaningful founding equity
• Direct ownership of architecture
• Real customers + revenue
• Live AI product in market
• Opportunity to build infrastructure powering AI-driven commerce + gaming

We are raising capital and expanding into iGaming + social commerce partnerships.

Start ASAP.

Specifically, we are looking for someone with extensive experience in 3D web development, ideally possessing most of the following skills:

WebGL (strong, hands-on experience)

Experience with LuciadRIA (alternatively CesiumJS or comparable 3D frameworks)

Performance optimization for large-scale 3D scenes

3D visualization experience

IFC / BIM experience (nice to have)

TypeScript

Node.js

It would also be a strong advantage if the candidate is a proficient full-stack developer, enabling them to support the team beyond 3D-related topics, including backend and database-related tasks. Depending on seniority and qualifications, I would also consider the candidate for a technical lead role.

Job Summary:
We are seeking a skilled Full Stack Developer with strong expertise in Web (React) and Backend (Node.js), who can also leverage AI-powered development assistants (such as Cursor) to accelerate and optimize development, to join our US-based team.

Key Responsibilities:

• Build and maintain responsive web applications using React and Next.js.
• Develop server-rendered features, API routes, and optimized page rendering with Next.js.
• Design and implement robust RESTful APIs and backend services with Node.js (Express.js, Nest.js).
• Integrate front-end and back-end components to ensure seamless client-server communication.
• Manage data storage solutions: SQL (PostgreSQL, MySQL) and NoSQL (MongoDB, Redis).
• Containerize applications with Docker and participate in CI/CD workflows.
• Write modular and integration tests using Mocha, Jest, or similar frameworks.
• Follow security best practices to protect applications and user data.
• Collaborate with cross-functional teams to deliver high-quality software on schedule.

Must-Have Skills:

• AI-Accelerated Development: Proven ability to leverage AI-powered coding assistants such as Cursor (or similar tools) to speed up development tasks, code reviews, and debugging.
• Backend Expertise: Minimum of 5 years of professional experience with Node.js and modern JavaScript/TypeScript.
• Front-End Mastery: Strong command of React and Next.js for modern web development.
• API Design: Solid experience creating and consuming RESTful services.
• Async Programming: Deep understanding of asynchronous patterns (async/await, Promises).
• Testing & Debugging: Hands-on experience writing and maintaining unit and integration tests.
• Containerization & CI/CD: Experience with Docker and CI/CD platforms (e.g., GitHub Actions, Jenkins).
• Version Control: Proficient with Git and pull-request workflows.
• Communication: Fluent English (Upper-Intermediate or higher) for technical coordination and documentation.

Preferred Qualifications:

• Familiarity with GraphQL.
• Experience in Agile/Scrum environments.
• Skills in UI/UX design and responsive styling (HTML5, CSS3, Tailwind).
• Team leadership or mentorship experience.

Why Join Us:

• Shape the future of AI in retail with a company recognized by Techstars, Google for Startups, and Stanford
• Work on large, impactful datasets with real-world applications
• Be part of a passionate, mission-driven team building world-class AI systems

We are seeking a Senior Full Stack Engineer (AI-Assisted) to join a fast-moving enterprise AI startup building on-premise LLM solutions for security-sensitive organizations.

This is not a traditional full-stack role. We are looking for a true “post-AI engineer” - someone who uses AI tools daily across their workflow and knows how to oversee, validate, and productionize AI-generated code.

The product already exists at a development level and now needs to be hardened, secured, and brought to production-grade standards.

Responsibilities:

• Take an existing dev-level platform and evolve it into a production-ready system
• Build and refine the full product layer around an AI/LLM engine
• Develop frontend and backend features end-to-end
• Review, validate, and secure AI-generated code
• Handle file systems, backend endpoints, and integration logic
• Work within a Kubernetes-based microservices architecture
• Ensure high security standards for enterprise, on-prem deployments
• Tie together loose ends and make the platform fully shippable

Requirements:

• Strong experience as a Full Stack Engineer (senior level)
• Daily hands-on use of AI coding tools (Cursor, Copilot, Claude, etc.)
• Clear understanding of AI-assisted development workflows
• Experience reviewing and securing AI-generated code
• Strong frontend experience (React / Flutter)
• Strong backend experience (Python / Node)
• Experience working with microservices architecture
• Experience with Kubernetes and Helm
• Ability to work autonomously with high ownership
• High availability and reliability

Preferred Qualifications:

• Experience with on-premise enterprise deployments
• Background in secure or air-gapped environments
• Experience building RAG systems or working with LLM integrations
• Strong architectural thinking and production mindset

What We’re Looking For:

• Engineers who prioritize understanding over process
• Comfortable working without heavy Jira/scrum overhead
• Strong problem solvers who can think through systems holistically
• Long-term mindset 

We are looking for a passionate Software Engineer to develop, innovate, and support Keylabs.AI, a data labeling platform. This role is critical to our mission and offers the opportunity to make a significant contribution to the AI ​​industry.

Qualifications

Education:
Bachelor's or Master's degree in Computer Science.
Experience

At least 5 years of full-time experience in software development.
Experience in team leadership roles would be an advantage.
Required: At least 2 years of experience in client-side web development using JavaScript, HTML, and CSS.
At least 2 years of proven experience with MongoDB and SQL databases, including writing complex SQL queries involving JOIN operations.
Hands-on experience with production systems and high-availability architectures.
Experience with automation, infrastructure as code, and GitOps.
Experience with Python-based machine learning tools such as PyTorch, Pandas, NumPy, etc.

Technical Skills:

Deep understanding of design patterns and ability to effectively apply them in various scenarios.
Knowledge of C or C++ is required.
Excellent Python proficiency with at least 3 years of hands-on experience.
Familiarity with C# and/or Java.
Excellent Node.js / JavaScript proficiency.
Deep knowledge of modern web frameworks (React, Angular, Vue, Django, Flask or similar).
Experience and knowledge of Docker and cloud platforms (AWS / GCP / Azure).

Requirements: 

Knowledge of Linux, Linux tools, network technologies and system security (main daily working platform is Linux).
Knowledge related to training and using machine learning models.
Ability to analyze and solve complex algorithmic problems.
Ability to interpret and understand complex technical specifications.

Working Schedule

• Willingness to occasionally work non-standard hours to support critical releases, incidents, or customer needs.

English Language

• Advanced level of English proficiency (C1).
  
   

We are looking for an AI-First Full-Stack Engineer: Golang Backend, Svelte (or any other frontend technology) Frontend. We don’t need coders, we need engineers who build features end-to-end using Claude Code.

Key highlights:

• AI coding experience (mandatory!): experience with Claude Code — #1 priority, or other agentic coding tools. Claude Code is what is used on the project
• Full-Stack Engineer with 5+ years of experience. We also consider really strong candidates with 4 years of experience
• Backend experience with Go is a primary requirement; frontend experience comes secondary.
• Svelte is the preferred frontend technology for this project, but candidates with other frontend experience are considered as well.
• Strong proficiency in English (Strong Upper-intermediate level or Advanced)
• Full-time
• Fully remote
• Start: ASAP, ideally, but can be discussed
• Long-term project

What you’ll actually do:

• Own features end-to-end: from specs to deployment to fixing bugs
• Use Claude Code to generate SvelteKit frontend and Golang backend code
• Review AI output for quality and architectural fit
• Fix bugs to learn our codebase, then rapidly build new features
• Make quick decisions on what to build vs buy vs generate with AI
• Talk to customers when they report issues and ship fixes the same day

Our stack:

• Frontend: SvelteKit, turbo monorepo, Vercel
• Backend: Golang monorepo
• AI: Claude Code (mandatory), other agentic coding tools

Products you will build:

• API: platform features, tooling, multi-agent system, etc.
• UIs: internal UIs, B2B dashboards, B2C web apps

You must have:

• Ownership mentality with a strive for elegantly simple, high-quality solutions
• Strive for max quality — you test your own work thoroughly since we have no QA team, everything you ship MUST work
• Product mindset — you care about WHY we’re building something
• Proven experience using Claude Code or similar agentic AI (Cursor, Windsurf)
• Strong SvelteKit and Golang experience — you’ll review AI’s code in these, and you must understand how it works
• Broad architectural knowledge of building modern full-stack applications
• Excellent spoken English and a good internet connection for daily video calls

You are a great fit if you:

• Get frustrated when development takes weeks instead of days
• You think in features and architecture, and not single lines of code
• Can spot subtle bugs in AI-generated code quickly
• You ship fast, but always verify it actually works
• Have shipped real products that customers actually use
• Think “how can AI build this?” as your first instinct

Red flags (don’t apply if):

• You’ve never used Claude Code or similar AI coding tools
• You’re a perfectionist who loves to code
• You need detailed specs before starting
• You see AI as a threat rather than leverage

Who we are looking for:

We are seeking a talented Fullstack Developer with expertise in Node.js or Python and React. to join our dynamic team. You will work on building scalable, user-friendly web applications, collaborating with designers, backend engineers, and product managers to deliver exceptional solutions.
 

Requirements:

• 5+ years of experience with Node.js or Python and React.
• Proficiency in JavaScript/TypeScript.
• Strong understanding of RESTful APIs and database systems (e.g., MongoDB, PostgreSQL).
• Familiarity with version control tools like Git.
• Experience with state management libraries (e.g., Redux, Context API).
• Knowledge of deployment pipelines and cloud platforms (e.g., AWS, Docker, CI/CD).
• Excellent problem-solving skills and attention to detail.
   

Nice-to-Have:

• Experience with Next.js
• Knowledge of GraphQL.
• Familiarity with testing frameworks (e.g., Jest, Mocha).
• Gen AI / Agentic AI (Google Gemini, Amazon BedRock)

Your future role

• Develop and maintain responsive web applications using React for the frontend.
• Build robust APIs and backend services with Node.js.
• Collaborate with cross-functional teams to define, design, and ship new features.
• Optimize applications for maximum speed and scalability.
• Troubleshoot and debug issues across the stack.
• Stay updated with the latest trends and technologies in web development.
   

What we offer:

• Competitive salary and benefits.
• Flexible working hours and remote options.
• Opportunities for professional growth and learning.
• A collaborative and inclusive work environment.

About the Client

Global FinTech startup,  is building a modern financial intelligence platform that helps teams analyze performance, forecasts, and operational metrics across time. The product is data-heavy, highly interactive, and correctness-driven. Accuracy, transparency, and trust are core principles.

We are early-stage but live, with real customers and real financial data. We move fast, but we do not break fundamentals.
 

Role Overview

We are looking for a Senior Fullstack Engineer to help design, build, and evolve core product functionality across frontend, backend, and data layers.

This is a hands-on role with real ownership. You will work closely with Product, QA, and other engineers to deliver features end-to-end, from API design to UI behavior to data correctness.

This role is not about managing people. It is about shipping high-quality software in a complex, data-driven environment.
 

What You Will Do

• Design and build end-to-end product features, from UI to backend logic to database interactions
• Implement and evolve core workflows, including:
  • Data ingestion and connector management
  • Metrics configuration and overrides
  • Time-based grouping (daily, weekly, monthly, quarterly, yearly)
  • Forecasting, reporting, and analytics views
• Design, build, and maintain NestJS-based backend services and integrations, including API endpoints, domain logic, data validation, and integration workflows
• Work within a modular monolith backend, contributing to shared domain logic and internal service boundaries
• Write efficient, readable SQL for data retrieval, aggregation, and validation
• Ensure correctness of financial calculations and aggregations
• Collaborate closely with:
  • Product on requirements and edge cases
  • QA on testability and bug resolution
  • Other engineers on architecture and code quality
• Review code and contribute to technical standards and best practices
• Participate in release planning and production readiness
   

Required Skills & Experience

• 5+ years of professional software engineering experience
• Strong experience building fullstack web applications
• Strong backend experience with Node.js-based API services, including business logic and data validation
• Strong SQL skills (required):
• Solid frontend experience with:
  • React
  • TypeScript
  • Modern component-based UI patterns
• Writing complex queries
• Aggregations and joins
• Reasoning about data correctness and performance
• Experience working with relational databases (PostgreSQL preferred)
• Comfort working in production systems with real users and data
• Ability to reason about edge cases, failure modes, and data consistency
   

Nice to Have

• Experience with financial, analytics, or reporting platforms
• Familiarity with React-based frontends
• Exposure to PostgreSQL or similar relational databases
• Experience working in early-stage or startup environments
• Exposure to Python is a plus, but the core backend is implemented in Node.js
   

What Success Looks Like in the First 90 Days

• You understand client’s data model and core product flows
• You ship multiple production features end-to-end
• Your code is readable, testable, and trusted by the team
• You proactively surface edge cases and data issues

Product and QA rely on you for clarity and execution
 

Вітаю тебе, фахівець \0/

Мене звати Кирил, я допомагаю зібрати дрім тім для своїх друзів з Hooh – це стартап від фаундерів Depositphotos. Команда сіньорна та досвідчена, тому опортʼюніті, ІМХО, дуже кльове.

отже

Hooh – це b2c AI-продукт, який робить складні документи простими для розуміння та дій. 

Він дозволяє завантажувати файли (PDF, фото, скани), автоматично розпізнавати їхній вміст, витягувати ключову інформацію та отримувати короткі, зрозумілі підсумки.
 

Ми успішно випустили v1, підтвердивши нашу основну AI-пайплайн-архітектуру. Зараз ми розширюємо продукт до “scanner-grade” PDF-досвіду, що поєднує глибоке AI-розуміння з надійним редагуванням документів.

Далі дозволю собі перемкнутись на англійську, бо мова піде про конкретні речі.
 

_________________

We are hiring a hands-on Engineering Lead (Full Stack) to own the Hooh engineering system end-to-end – architecture, reliability, and delivery. 
You will lead a small, high-output team (Backend, Full Stack, Applied AI, and iOS) while serving as a "player-coach".
 

You will architect and integrate Hooh’s end-to-end AI document understanding pipeline covering OCR, extraction, and conversational Q&A, paired with robust document manipulation capabilities.
 

This role could grow into Head of Engineering or CTO as the team scales.

Key Responsibilities

• End-to-End System Ownership
  • Own the entire pipeline: document ingest → processing (OCR/extraction) → AI workflows → APIs → iOS/web experiences.
  • Design and evolve API surfaces for document ingestion and AI-driven summarization.
• Architecture & Execution
  • Define service boundaries, API contracts, data models, and rollout patterns that keep the system coherent as the product surface area grows.
  • Engage in design reviews that span service decomposition and weigh CAP trade-offs.
• Hands-on Engineering
  • Ship core features across backend and web (React/Next.js/Node.js).
  • Unblock teammates and set the quality bar through exemplary PRs and technical decisions.
  • Optimize frontend hydration, bundle-splitting, and rendering concurrency.
• Reliability & Trust
  • Ensure reliability by design: idempotency, non-blocking execution, and horizontal scalability across worker clusters.
  • Implement security best practices around authentication, encryption, and secure data handling.
• Team Leadership
  • Improve delivery cadence through clear ownership, strong reviews, and pragmatic processes – keeping the team moving fast with confidence.

What We’re Looking For

• 5–7 years shipping production systems, with a strong preference for startup or high-ownership environments.
• Full-Stack Fluency: Deep expertise in TypeScript/JavaScript across backend (Node.js/Express) and frontend (React/Next.js).
• Database Depth: Advanced literacy in Postgres/MySQL, including schema evolution, query planning under load, read/write splitting, and connection pool tuning.
• Cloud & Infra: Proficiency with AWS/GCP/Azure, containers (Docker/K8s), CI/CD, and IaC (Terraform/CDK).
• Async Architectures: Experience with message queues (Kafka/SQS) and background job frameworks.
• Product Judgment: Ability to balance speed, quality, and architecture without over-engineering.
• Communication: Clear communicator who can align a small team and keep execution crisp.

Nice to Have Experience With

• Mobile-first products (especially iOS integration constraints and API versioning).
• Building PDF/document tooling (rendering, editing operations, performance at scale).
• Operationalizing AI/LLM features in production (evaluation, guardrails, monitoring).

The Team

• CEO
• Product Manager
• Fullstack Engineering Lead
• Back End Dev
• Fullstack Dev 
• AI engineer
• User Acquisition Manager
• 2х Designers 
• 2x iOS Devs

What We Offer

• Challenging technical problems and the environment to solve them.
• A clear growth path into Head of Engineering/CTO at a later stage.
• Direct influence on strategy and the ability to see your experiments ship fast.
• Be part of a team that previously built and scaled successful businesses.
• Flexible schedule and fully remote work from anywhere with reliable overlap to CET.
• 18 paid vacation days, 8 no-paperwork sick days, and 11 public holidays per year.
• Minimal bureaucracy, high trust, fast decisions.

Hiring Process:

1. Intro Call
2. Interview with CEO
3. Offer

About the role

We are building a revolutionary system at the frontier of technology and AI.

As a Software Engineer, you won’t just write code — you will shape the future of how apps are built. You’ll be part of the early execution engine—shipping core capabilities, refining the experience, and elevating reliability. Expect tight loops, clear ownership, and visible impact. You will engage directly with first clients, adapt the platform to their needs, and set the stage for the next generation of software creation.

What we’re looking for

We want someone who doesn’t just “fit the role” but defines it:

• Open-minded explorer — ready to try bold ideas, new approaches, and cutting-edge tools.
• Hacker mindset & problem solver — able to connect the dots across complex systems and find elegant solutions.
• Analytical & resilient — thrives in debugging intricate, interconnected architectures.
• Startup speed enthusiast — comfortable hacking fast, shipping early, learning from feedback, and polishing later.
• Experienced in Cursor or Claude Code.
• Passionate about vibe-coding  — turning AI into your engineering team-mate.
• Natural leader — with the drive to inspire and guide people.

Why join us?

• Be among the first engineers driving a bold, world-changing vision.
• Work at the bleeding edge of technology and AI, where experimentation is not just allowed but expected.
• Direct influence on product.
• A chance to build something that reshapes how things get done in today’s world.
• A team that values curiosity, creativity, and the pure joy of hacking together the future.

This isn’t just another job. This is your chance to engineer the future of software itself.

Technical stack

Core technologies:

• TypeScript, React.js, Next.js, Bun.
• ClickHouse, PostgreSQL, Redis
• Docker / Kubernetes
• Kafka
• Supabase, Inngest, Posthog

Nice to have:

• Vue.js
• Python
• Go
• Ruby

Hiring Process

Stage 1: Interview with HR (1h).

Stage 2: Interview with VP of Engineering.

Stage 3: Technical assignment.

Stage 4: Tech. Interview

Stage 5: Interview with the team.

What we offer for your success

• Very warm and friendly working environment and flexible working schedule.
• 20 days off + paid national holidays, and 12 sick days paid by the company per year.
• Medical insurance, and health protection programs (with COVID-19 and dental coverage).
• Continuous professional development and growth opportunities.

We’re looking for a proactive, team-oriented and motivated Full Stack Engineer (WordPress / React) who will be responsible for both back-end and front-end development, including creating custom WordPress themes and plugins.

You’ll work closely with partners and stakeholders, participate in architecture decisions, and contribute to building scalable and reusable solutions from scratch.

Responsibilities

• Communication & coordination with partners and clients
• Participation in planning, architecture, and technical evaluation
• Application architecture and design
• Auditing and analyzing project documentation and specifications
• Setting up project core structure from scratch
• Maintaining and improving ongoing projects
• Developing and maintaining reusable components
• Driving an agile development process within the team
• Building responsive WordPress themes and custom plugins
• Creating custom Gutenberg blocks

Requirements

• 5+ years of commercial experience in web development
• Strong experience with WordPress (including headless WordPress)
• Solid knowledge of PHP and OOP principles
• Experience in developing custom WordPress themes and plugins
• 5+ years of experience with JavaScript (React.js, jQuery)
• Experience creating Gutenberg blocks from scratch
• Experience with Advanced Custom Fields (ACF)
• Strong knowledge of HTML, CSS3, and responsive development
• Experience working with APIs
• Good understanding of REST principles and RESTful services
• Experience with Git
• Upper-Intermediate or higher English

Nice to have

• Experience with JavaScript or PHP frameworks (Angular, Vue.js, Symfony, Laravel, etc.)
• Experience with Docker
• Experience with MVC-based WordPress frameworks (Lumberjack, Sage, Themosis, TypeRocket, etc.)

We are currently looking for an experienced Strong Middle / Senior Full-Stack Developer to join the Constrol Digital Platform team.

Constrol operates in the construction industry and offers three core products: a Digital Platform, BIM Modeling Services, and Budget Accompaniment. The Digital Platform enables users to create a clear Bill of Quantities (BOQ) connected directly to BIM models, presenting data side by side in an efficient and user-friendly way — even for non-technical users.

The platform supports complex operations such as clause isolation within written quantities, intersection analysis by territory and craft, and automated quantity calculations. The project is in the maintenance and active development phase, including architecture upgrades, refactoring, and development of new features (some from scratch).

You will join a collaborative team working in Agile methodology and contribute to the long-term evolution of the product.
 

Requirements:

• Bachelor’s degree in Computer Science or a related field (mandatory)  
• 5–6+ years of experience in Full-Stack development (4.5+ years may be considered for strong candidates)  
• Strong proficiency in HTML, CSS, and JavaScript/TypeScript  
• Hands-on experience with React (frontend)
• Solid backend experience with Node.js and/or Nest.js  
• Experience with PostgreSQL and relational databases  
• Strong understanding of front-end and back-end architecture  
• Experience with microservices architecture and event-driven patterns  
• Familiarity with cloud platforms (GCP preferred, AWS/Azure are also relevant)  
• English level: Upper-Intermediate (B2)+  
• Strong team player, self-managed, responsible, and professional  
   

Nice to have:

• Experience with MongoDB  
• Experience in BIM domain  
   

Responsibilities:

• Participate in the design and development of a scalable, high-performance platform  
• Develop new features, maintain existing functionality, fix bugs, and improve performance  
• Contribute to architectural upgrades and refactoring initiatives  
• Collaborate closely with developers, Product Manager, and CTO to ensure smooth system integration  
• Work with stakeholders to define requirements, scope, and timelines  
• Contribute mainly to Backend (approx. 60%) and Frontend (approx. 40%) development  
   

We Offer:

• 20 vacation days (workdays)
• 7 sick days
• Personalized career growth
• Internal English classes
• Education reimbursement
• Corporate events and team buildings
• Equipment provided

You’ll build the intelligence and autonomy layers on top of a solid architecture: .NET 9 modular monolith + Python/FastAPI services on GCP (Pub/Sub, Cloud Tasks, BigQuery, Supabase/PostgreSQL) with live Meta Ads API and Shopify GraphQL integrations.
In the first 90 days you’ll deliver three defined sprints: Shopify attribution + benchmarks (Sprint 1), Creative Intelligence with embeddings + LLM fallback (Sprint 2), and an agentic loop with an Action API that executes approved Meta Ads actions (budget scaling, pause, deploy) with audit/audit trail (Sprint 3).

Product & Environment

We’re building a system with a modern stack and live integrations, where your decisions affect real ad accounts:

• C#/.NET 9 modular monolith, Python/FastAPI microservices, Next.js 16, Supabase/PostgreSQL, BigQuery, Google Cloud (Pub/Sub, Cloud Tasks, GCS)
• Integrations with Meta Ads API and Shopify GraphQL
• 20 repositories, ~95k LOC, event-driven pipeline

How We Work

Claude Code is not optional. We use AI as a force multiplier: we measure output, not hours. The code must work, tests must pass, and APIs must behave correctly.
The wrong candidate either refuses to use AI tools (“I prefer to write it myself”) or over-trusts them (“Claude Code wrote it so it must be correct”).

Responsibilities

• Build features in .NET (core API) and Python/FastAPI (pipeline / categorization / agent services)
• Integrate with Meta/Shopify and work on real budget/campaign changes
• Work with PostgreSQL: schemas, migrations, indexes, query optimization
• Strong testing culture: unit/integration/E2E where needed

Requirements (Non-negotiable)

• Production C# / .NET 8–9: EF Core migrations, DI patterns, middleware; able to read a modular monolith without “hand-holding”
• Experience with GraphQL resolvers (HotChocolate is a plus, but any GraphQL server is fine)
• Production Python / FastAPI: async/await, Pub/Sub message handling, gRPC; integrations with AI APIs (OpenAI/Anthropic, etc.)
• API integrations: integrated with at least two complex third-party APIs (Meta Ads / Google Ads / Shopify GraphQL / Stripe, etc.), including rate limiting, pagination, webhooks, versioning
• AI-augmented development: daily use of Claude Code / Cursor / Copilot (or similar) + understanding where they fail
• Testing discipline: tests are part of the process, not “later”

Strong Plus

• Ecommerce/DTC (Shopify, attribution, ROAS, NC vs returning customers)
• Experience with embeddings / cosine similarity / clustering / recommendations
• Event-driven architecture (Pub/Sub or Kafka), idempotency, DLQ, eventual consistency
• Hands-on GCP (Cloud Run, Cloud Tasks, Pub/Sub, BigQuery, GCS)
• Experience preparing a SaaS/agency for exit (focus on quality, documentation, system autonomy)

What You’ll Build (First 90 Days)

We have 3 detailed sprints — no ambiguity or fluff — with clear deliverables from Day 1.

Sprint 1 (Weeks 1–2): NC Attribution + Shopify Integration

• Customer/Order entities; NC classification (customer.numberOfOrders == 1)
• Channel attribution via Shopify customerJourneySummary + click ID parsing (fbclid/gclid/ttclid)
• EWMA benchmark fixes + unit tests; CM1/CM2/CM3 contribution margin; Benchmarks page API

Sprint 2 (Weeks 3–5): Creative Intelligence + Testing Arena

• Attribution Confidence scoring (High/Med/Low/Dark)
• Efficiency Score (0–100), zone classification (Winner/Functional/Testing/Kill Zone)
• Persona/Angle categorization via embedding similarity + LLM fallback
• Creative Matrix data layer, Scale Opportunities endpoint

Sprint 3 (Weeks 5–8): Agentic Loop + Owner Independence

• Decision Engine (rules-based action queue + priority scoring)
• Action API: execute approved actions via Meta Ads API (budget scaling, pause, deploy)
• Decision logging + audit trail
• Integrations: Nano Banana creative generation, MILA AI assistant, brand onboarding

Not a Fit If

• You think AI coding tools are a fad or “beneath senior engineers.” Our workflow is built around them.
• You need architecture hand-holding. Sprint scopes are detailed, but you must make real-time decisions on data modeling, API design, and integration patterns without waiting for approval.
• You only work in one language. This role requires fluency in both C# and Python. TypeScript is a bonus, not required for this scope.
• You’ve never integrated with complex third-party APIs. If your experience is mostly internal CRUD apps, Shopify/Meta edge cases will slow you to a crawl.
• You ship code without tests. We have 440 lines of untested financial math (P0 fix). Testing is core to the job, not “if there’s time.”
• You need a detailed spec for every function. We define WHAT to build and WHY — you decide HOW.
• You want a strict 9–5. This is a high-intensity engagement with a clear deadline. We’re not asking for 80-hour weeks, but we need someone who ships consistently and communicates proactively when blocked.

About the Role

As a Senior Full Stack Developer, you will play a pivotal role in designing, developing, and maintaining our web applications, ensuring high performance and scalability. You will work closely with cross-functional teams to deliver high-quality software solutions while contributing to projects that integrate advanced machine learning models, including large language models (LLMs), to deliver personalized user experiences and innovative features. You’ll be part of a small, collaborative team that values continuous improvement and embraces the latest in technology.

Our technology stack includes .NET Core, C#, React.js, Node.js, Typescript, SQL Server 2019, Docker, Kubernetes, Google Analytics, and Power BI.

Our ecosystem includes 170 connected applications and services, our main database is 2 TB, our sites handle 1 million visitors a day and 2 billion requests a month, and we release changes to production several times a day. We are a continuous integration and continuous deployment (CI/CD) organization. 

What You’ll Do:

• Guiding the team in making well-informed technical decisions that enhance the quality and maintainability of our solutions.
• Collaborating with cross-functional teams to demonstrate how they can effectively leverage our infrastructure to meet their objectives.
• Designing, developing, and maintaining robust, scalable, and efficient web applications, backend logic modules and database structure.
• Identifying and implementing strategies to improve the stability, performance, and scalability of our applications and services.
• Responding promptly to production incidents, employing creative problem-solving skills to minimize downtime and mitigate potential issues.
• Mentoring and supporting team members, fostering a culture of continuous learning and technical excellence.
• Conducting code reviews and ensuring adherence to coding standards and best practices across the team.
• Participating in the evaluation and integration of new technologies, including AI and automation tools, to drive innovation and efficiency.

What We’re Looking For:

• Minimum of 5 years of professional experience in full-stack development.
• Extensive experience with React.js, including state management (Redux, Context API) and component-based architecture.
• Proficiency in .NET frameworks, C#, and data access technologies.
• Familiarity with Unit / Integration tests using any of Jest, NUnit, Playwright, React Testing Library.
• Strong knowledge of front-end technologies such as HTML5, CSS3, JavaScript, and TypeScript.
• Familiarity with database systems such as SQL Server or MySQL.
• Strong knowledge of design and architectural patterns, SOA design & web service development.— Strong understanding of development processes.
• Experience with LLMs / Generative AI tools (e.g., OpenAI, Copilot, Cursor).
• Experience with Web Page performance optimization and measurement will be a plus.— Degree in Computer Science, a related discipline or equivalent work experience.
• Upper-intermediate level of English.
• Excellent problem-solving and analytical skills, with a keen attention to detail.
• Strong communication and interpersonal skills, with the ability to work effectively in a team-oriented environment.
• Ability to manage multiple tasks and prioritize effectively in a fast-paced environment
• Demonstrated leadership abilities, with a track record of mentoring and guiding junior developers.

Perks and Benefits

• Time off throughout the year (paid and unpaid)
• Professional development support and encouragement
• Resources to help improve your overall well-being
• Free JustAnswer membership

NeduAI is a Finnish GovTech startup at the intersection of education and public sector service delivery. We're building SmartProfile — a "neural hub" connecting skills, jobs, and education — replacing static resumes and outdated job boards with a data-driven, human-centered career ecosystem.

We partner with Finnish municipalities (Vantaa, Kotka), Unemployment Funds (A-kassa), Trade Unions, and educational institutions (XAMK, Laurea). You're joining at a critical scaling phase as we expand from Finland to a broader Nordic presence.

What you'll own:

• Lead the engineering team, set best practices, and own the technical roadmap
• Drive migration from AWS/Azure to EU-based sovereign infrastructure
• Manage PostgreSQL + Vector store architecture powering ML features and RAG capabilities
• Ensure GDPR & AI Act compliance, OAuth/MFA, data encryption
• Architect and scale RESTful APIs integrating SmartProfile with client systems
• Lead development of Assistant PRO — an AI agent for public sector administrators

What we're looking for:

• Proven experience leading technical teams
• Expert backend development (Python, Node.js, or Go) + distributed systems
• Kubernetes, containerization, production workloads (99.5%+ SLA)
• AI integrations, Vector Databases + PostgreSQL
• LLM fine-tuning, monitoring, and agentic workflow experience
• OAuth 2.0, encryption protocols, data privacy regulations
• Automated testing and monitoring/DevOps practices