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Principal Software Engineer

New RemoteNorth AmericaFull-timePrincipal

Gitwit is an AI-first venture studio seeking a Principal Software Engineer to lead the technical direction and zero-to-one development of multiple AI-native products. The role involves full-stack development using TypeScript, React, and Node.js, while collaborating closely with product and venture leaders to build and scale new ventures.

AI Anthropic API Automation Cloud +9 skills

Brand Designer

Senior Brand Designer owning HASH's visual expression across sales and marketing communications—decks, diagrams, illustrations, editorial graphics, and campaigns—turning complex knowledge-graph and AI concepts into clear, on-brand visuals using tools like Figma and PowerPoint.

AI Data Visualization Figma Trello Typography

65K – 100K £

Platform Engineer

New On-siteEurope

Platform/Developer Experience Engineer building and maintaining CI pipelines, build systems, testing infrastructure, and internal tooling for an AI legal-tech company, with Python tooling as the core technology stack.

AI CI/CD Developer Experience JavaScript Kubernetes +3 skills

Head of Revenue Operations & Strategy (f/d/m)

Open 65d HybridEuropeFull-timeC-level

Leads revenue operations for a climate-tech startup, optimizing Salesforce and GTM tools to drive data-driven growth and forecasting for enterprise clients in carbon credit and sustainability markets.

Analytics CRM Go-to-Market Process Improvement Salesforce +1 skills

WIITY AI PTY LTD

Founding CTO - Hands On Fullstack

New HybridC-level

The Founding CTO will lead the technical architecture and hands-on development of an AI-powered recruitment platform, transitioning existing solutions into a scalable product. This role requires deep full-stack expertise in React, Python, and SQL, alongside experience in building and deploying LLM-based agents and managing AWS cloud infrastructure.

Agentic AI AI Analytics API AWS +13 skills

170K – 230K AUD

Manager - Data Integration

Open 48d HybridEurope

Leads a team of 3 Data Integration Managers to industrialize Seyna’s insurance data pipelines, ensuring data quality, scalability, and compliance while aligning with business needs.

Medivise Healthcare GmbH

Software Developer (all genders) - Junior bis Mid-Level

New EuropeMiddle

Medivise Healthcare is seeking a Junior to Mid-Level Software Developer to build digital health infrastructure. The role involves full-stack development using Kotlin, Quarkus, PostgreSQL, Flask, and HTMX, alongside managing cloud deployments and hardware integration.

Ansible API CI/CD Cloud C# +20 skills

50K – 60K €

Senior Security Researcher

Open 19d On-siteMENASenior

Senior Security Researcher discovers browser/network/endpoint threats and designs product-level mitigations, bridging offensive tradecraft (exploits, malware analysis) with defensive engineering (detections, policies) for Island’s AI-powered enterprise security platform.

AI Ai Enablement Automation DLP EDR +2 skills

Applied Intuition

Senior Fullstack Engineer (UK) — Frontend/Backend & Security

New North America, UKSenior H-1B sponsor history

Senior Fullstack Engineer at Applied Intuition Defence in London, shipping user-facing products end-to-end from UI through services and data layers, with emphasis on security, Kubernetes, and containerised deployments.

Recruiting from Scratch

Senior Software Engineer, Backend

New North AmericaSenior

Design and build core backend infrastructure for AI data generation and evaluation pipelines using Python or Node.js, Kubernetes, Kafka, and Redis on AWS/GCP, owning scalability and performance of distributed, high-throughput systems.

Agentic AI AI AWS Backbone.js Cloud +10 skills

250K – 300K $

Senior Software Engineer (Formal Methods & Agentic Systems)

New RemoteNorth AmericaFull-timeSenior

This role involves productionizing research-grade agentic AI systems that utilize formal methods to solve complex client problems in energy and infrastructure. You will bridge the gap between research and production by building robust, testable, and scalable software architectures that integrate LLM agents with constraint solvers.

Agentic AI AI Ai Enablement API Data Modeling +6 skills

140K – 230K $

Software Engineer (Senior, Staff) - Remote

New RemoteCISStaff

Work directly with the CEO to own end-to-end feature development for Replika's AI companion product, shipping to tens of millions of users. Focus on applied AI in a consumer setting with a fast-paced, startup environment.

Software Engineer (Indexer Focus) - Shielded

Open 17d RemoteWorldwide

Build and maintain the Midnight Indexer—a Rust-based service streaming blockchain data from Midnight nodes to wallets via GraphQL, handling real-time subscriptions, PostgreSQL/SQLite storage, and privacy-preserving data processing.

API Api Design Blockchain Cloud Cryptography +9 skills

Senior/Staff Backend Engineer

Open 17d RemoteWorldwideFull-timeStaff

Designs and maintains core backend APIs for a loyalty and payments platform connecting restaurants with customers, focusing on scalable, high-quality solutions and mentoring engineers in a fast-paced startup environment.

AI API AWS Blockchain Cryptography +11 skills

180K – 220K $

Senior ML Engineer (Client Solutions)

New RemoteNorth AmericaFull-timeSenior

Senior ML Engineer deploying forecasting and detection models directly into client environments, owning the full lifecycle from data discovery through production scheduling and monitoring, using Python, SQL, Docker, FastAPI, and cloud tooling.

Agentic AI AI Ai Enablement API AWS +19 skills

140K – 225K $

Intrepid Ventures

Blockchain Protocol Engineer

New RemoteWorldwideContract

The Blockchain Protocol Engineer will build and maintain scalable, fault-tolerant blockchain systems using GoLang or C++, while leveraging expertise in cryptography, distributed systems, and smart contract development. The role is fully remote and requires a self-starter capable of working in an asynchronous, global environment.

Blockchain C++ Cryptocurrency Cryptography Distributed Systems +8 skills

Staff/Principal Data Engineer - up to £220k - Stealth Start up

New HybridUKPrincipal

Staff/Principal Data Engineer at a London stealth startup building data infrastructure for next-generation AI, responsible for owning technical direction and designing scalable data platforms from the ground up.

AI Data Engineering Machine Learning

Quantum Data Engineer — Scientific Software & Dashboards

Build data pipelines, dashboards, and analytics tools to support quantum hardware development at OQC, working with experimental and manufacturing data to drive insights.

Analytics Data Pipelines Data Quality

Datatech Analytics

Data Engineer – AWS, PySpark & AI

Build and optimize scalable AWS data pipelines and ETL/ELT processes using Python, SQL, and PySpark for an AI-driven consumer intelligence platform, with hybrid work in London.

Agentic AI AI AWS Data Engineering Data Pipelines +7 skills

Senior/Lead Data Engineer

New HybridUKContractLead

First senior data hire at a pre-Series-A AI startup automating property management admin, owning end-to-end data architecture—Python, Postgres, Kafka, and vector databases—building batch and real-time pipelines from near-scratch.

AI Airflow AWS Azure Cloud +19 skills