Back End Developer
About Gadriel Gadriel is the AI System Assurance company. AI is now writing code, making decisions, and running inside production systems, and most teams can't prove any of it works before it ships. We validate what AI writes, what AI does, and what it's deployed into, before release. Our founders have 25 years in enterprise cybersecurity and hold three USPTO patents. We're building the validation layer that teams will need for every AI system they deploy. The role We're hiring a Backend Engineer to build the core validation engines and services behind our products. You'll work on deterministic, reproducible validation: the same input gives the same result every time. This is systems work, not prompt wrangling. What you'll do Design and build backend services and analysis engines that validate AI-generated code and AI system behavior Implement validation techniques that are mathematically grounded and reproducible, not "LLM-as-judge" Build high-throughput, reliable pipelines that run locally, in CI/CD, and in customer environments Integrate with AI coding tools, agent frameworks, and enterprise systems Own services end to end, from design through production Work directly with the founders and shape the architecture What we're looking for Strong backend engineering skills in Python, Go, or C++ . Deep in one is enough; we don't need all three. Solid fundamentals: distributed systems, APIs, concurrency, performance, testing A working understanding of AI concepts: LLMs, agents, RAG, embeddings, and how these systems fail Comfort reading and reasoning about code you didn't write Ownership. You ship, you measure, you fix. Nice to have Experience with static analysis, security tooling, or developer tools Familiarity with agent protocols such as MCP Background in applied math, statistics, or information theory Experience in a startup or early-stage environment Why Gadriel Real technical depth in a new category Founder-led team with enterprise credibility and patented IP Fully remote Early-team ownership and influence Compensation: [range] + [equity] To apply Use apply feature from LinkedIn
$200k
...robust systems Ability to serve as the first engineer and take end-to-end ownership of a system Familiarity with modern C++, low... ...institutions to trade prediction markets at scale Design and develop low-latency execution, venue connectivity, and supporting...SuggestedFull time- ...wants to meet, a time is agreed, an invite goes out, a result comes back, an offer is signed, and the search is closed. Each of those... ...and a record that still matches the story the recruiter would tell a client at the end of the search. #J-18808-Ljbffr Marathon TalentSuggestedImmediate start
$200k
...bias toward reliability over raw speed: you build things that don't break Comfortable being the first engineer and owning a system end to end Tech stack / skills Modern C++ Low-latency execution xhyhwjd and market-connectivity systems Market data and...Suggested- ...Our client, a technology company dedicated to creating safer, more dynamic financial markets, is looking for a Back-End Developer . The company is removing capital constraints and providing greater access to diverse capital and investment opportunities This is...SuggestedWork at office
- ...Job Description Job Description We are looking for an experienced Back-end Developer to join our IT team. You will be responsible for the server side of our web applications. If you have excellent programming skills and a passion for developing applications or...SuggestedWork experience placement
$165 per hour
...covert that into a something beautiful, then you are the one we are looking for.As our Sr. Backend Engineer, you will be:You will develop efficient web services and APIsYou will participate in daily code deploys while working on individual or team projectsYou will convert...$140k - $160k
...Back-End Engineer | Node.js / TypeScript | Major Media & Entertainment Brand Do not pass up this chance, apply quickly if your experience... ...scale backend services in Node.js / TypeScript Design and develop production REST APIs Work across high-traffic consumer-...$140k - $160k
...team collaboration.What you'll do: Design, develop, and maintain backend services for our... ...also proud to be the first and only venture-backed fintech to join the CEO Action for... ...the reasonably anticipated low and high end of the salary range for this position. Actual...Work at officeWork from homeFlexible hours$180k - $230k
A start up is looking for a Backend Founding Engineer to join their team. Please read the information in this job post thoroughly to understand exactly what is expected of potential candidates. Location: NYC; Must be able to work in NYC 4 days onsite per week...- New York City | In person | Full time TL;DR Deepline is hiring a Founding Backend Engineer to build the systems that make bespoke GTM software reliable in production. You will own the data, integrations, and execution infrastructure behind a product that lets people...Full time
- ...systems Have strong system design instincts and own problems end-to-end across APIs, infrastructure, and data flows Are... ...you’ll own You'll have broad ownership across architecture, developer experience and production systems. The infrastructure problems...
- ...power document ingestion, processing, and analysis Build and maintain the APIs used by our frontend and internal AI services Develop pipelines for PDFs, Office files, email containers, and OCR driven workflows Improve performance across database access patterns...Work at office
- .... Established in 2018, Portra is venture-backed and based in New York. We're looking... ...work closely with cross-functional teams to develop robust backend solutions while ensuring... ...partners Own production incidents end-to-end — from detection through root cause...Local area
- ...design and implement RESTful APIs, optimize database queries, and improve system performance. You'll work closely with frontend developers to define API specifications. About the Team Our backend team is responsible for building and maintaining the infrastructure...
$190k - $250k
...schema Creating integrations, connectors, and data pipelines across enterprise tools Developing internal tooling and libraries that improve engineering velocity Owning systems end-to-end, including deployment and observability You'll enjoy this if you care...- ...Senior Back-End Developer This role involves designing and supporting scalable, secure, and resilient platforms for critical business applications. The position is based in New York, NY, and requires onsite presence. It is a contract role with opportunities to work...Contract work
- ...Title: Backend Developer Location: Hybrid - Wilmington, DE; McLean, VA; Richmond, VA; or New York, NY Prior bank Highly preferred... ...This is not real-time or streaming. The project is at the tail end and already built; work now is customizations, enhancements, and...For contractors
$80 per hour
...with different schemas and constraints. Develop platform capabilities that enable... ...for our customers' tech stacks. Own end-to-end delivery of backend features and services... ...high-quality customer experiences backed by robust backend systems. Requirements...Work at officeLocal area$120k - $150k
...rewards. We're growing fast and are backed by leading venture capital firms, including... ..., and maintain meaningful systems from end to end. We're looking for someone who... .... Backend Engineering: Design and develop reliable, scalable backend services and APIs...$140k - $210k
...platform that operates at high-scale today. Developers and companies around the world build on... .... Today, nobody owns this layer end-to-end. Pieces exist, but the JSON-RPC endpoint... ...full path from client to consensus and back. Status tracking, error reporting, and timeout...Temporary workWork at officeLocal areaWorldwideFlexible hours$170k - $300k
What’s the role?As a Back End Engineer at Bilt, you’ll join a renowned team that is transforming the future of renting. You will be responsible for designing, implementing, and documenting the back-end services for the Bilt mobile app and website while coaching and mentoring...- ...platform for enterprises, neobanks, platforms, developers, and AI agents. Our technology allows... ...massive impact at a hypergrowth company backed by some of the top investors in fintech,... ...Scale our infrastructure to millions of end users globally Rapidly ship new capabilities...Work at officeWork from homeWorldwideFlexible hours
- ...Backend Developer We are seeking a Senior Backend Developer who will design, build, and maintain backend services, APIs, and platform... ...initiatives. Drive features from prototype to production with end-to-end ownership. Collaborate with product, architecture, security...Remote work
- ...sustainability, asset, and investment management platform. We're backed by Y Combinator, Google, and Stanford — and we're the fastest-... ...being asked and never let someone stay stuck You own your work end-to-end - proactive about visibility, proud of your progress, and...Work at officeFlexible hours
- ...than the last. Everyone has direct influence over architecture decisions. There's no platform team to hand things off to -- you own it end to end. The environment is greenfield, and the problems are unlike traditional backend engineering: non-deterministic, cost-sensitive...
- ...New York City — In-Person The Opportunity Our client is hiring a Founding Senior Backend Engineer to own the data platform end-to-end and build the team around it. This is a true founding role: you will define canonical data models, ship the event backbone, enable...
- ...support the active project demands and skills gaps our staffing experts can help you find the best job for you. Role: Senior Back-End Developer Location: New York NY Duration: 12 months Required Skills: Back-End Developer Job Description: As a Senior...Permanent employmentContract workTemporary workRemote work
- ...in Jersey City in Jersey City, NJ Our client seeks a senior back-end engineer to build scalable data services in Java and modernize... ...Rate: $90.00 to $85.00/hr. w2 Responsibilities Design and develop scalable back-end data services using Java frameworks. Work...
- To support a growing team, the full-time Backend Developer will design, develop, implement, and maintain enterprise/SaaS applications while working remotely. Key responsibilities Develop and maintain backend applications using Java, Spring Boot, and related testing frameworks...Full timeRemote work
$110k - $270k
...Engineer for a confidential client — a well-funded AI platform company used by ML teams globally. In this role you will own features end to end across APIs, CLI tooling, billing systems, and platform integrations. The team is small and senior, the engineering bar is high...Flexible hours2 days per week
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