Sixtyfour

Founding Engineer — Full-Stack

Founding Engineer — AI Research Agents (Full-Stack)

Sixtyfour builds AI research agents that discover, link, and reason over information about people and companies, transforming this intelligence into automated research workflows for sales, recruiting, and marketing. The Founding Engineer will build polished product experiences using Next.js and TypeScript, design backend APIs with FastAPI/Python, evolve the workflow engine, ship data pipelines, scale the AWS/Docker stack, and implement end-to-end product features, contributing to billing, permissions, and real-time UX.

<h3 class="text-xl md:text-2xl font-bold mt-8 mb-3 text-gray-800">About Sixtyfour</h3><p class="my-4 text-gray-700 leading-relaxed">We build AI research agents that can discover, link, and reason over everything about people and companies. The platform turns that intelligence into automated research workflows for sales, recruiting, and marketing.</p><h3 class="text-xl md:text-2xl font-bold mt-8 mb-3 text-gray-800">About the role</h3><h4 class="text-lg md:text-xl font-semibold mt-6 mb-2 text-gray-800">What you’ll do</h4><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Build polished, fast product experiences in <strong>Next.js + TypeScript</strong> (design-quality UI, accessible components, responsive layouts).</li><li class="leading-relaxed">Design clean backend contracts and APIs (<strong>FastAPI/Python</strong>) for workflows, jobs, billing, and auth.</li><li class="leading-relaxed">Evolve our <strong>workflow engine</strong> (DAG/state machine): scheduling, retries/idempotency, rate limits, progress tracking, logs, and user-visible run history.</li><li class="leading-relaxed">Ship data pipelines and background workers (Celery/queues), with strong observability and alerting.</li><li class="leading-relaxed">Scale and harden the stack on <strong>AWS + Docker</strong> (ECS/EKS or similar), with caching (Redis), pagination, backpressure, and cost controls.</li><li class="leading-relaxed">Implement product features end-to-end: DB schema → API → UI, including tests and telemetry.</li><li class="leading-relaxed">Contribute to billing (Stripe), permissions/RBAC, and realtime UX (SSE/WebSockets) for run status.</li><li class="leading-relaxed">Maintain a high bar for reliability, performance, and UX; instrument everything.</li></ul><h4 class="text-lg md:text-xl font-semibold mt-6 mb-2 text-gray-800">Minimum requirements</h4><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Strong backend skills in <strong>Python</strong> (FastAPI preferred): API design, testing, error handling, schema/versioning.</li><li class="leading-relaxed">Experience deploying/operating with <strong>Docker</strong> and a major cloud (AWS preferred: ECS/EKS/Lambda, SQS, CloudWatch).</li><li class="leading-relaxed">Proven work on <strong>workflow/job systems</strong>: queues, retries, idempotency keys, scheduling, and run histories.</li><li class="leading-relaxed">Comfortable with <strong>Postgres</strong> (or MySQL) schema design and <strong>Redis</strong> (caching, rate limiting, locks).</li><li class="leading-relaxed">Performance mindset: RSC/Server Actions, data-fetching patterns, bundle/TTFB tuning, DB query perf.</li><li class="leading-relaxed">Production observability: logs, traces, metrics (e.g., Langfuse, OpenTelemetry, Sentry), and on-call pragmatism.</li><li class="leading-relaxed">Solid security hygiene (PII handling, secrets, JWT/session auth, CSRF/CORS, least-privilege access).</li></ul><h4 class="text-lg md:text-xl font-semibold mt-6 mb-2 text-gray-800">Nice to have</h4><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Next.js App Router, RSC, <strong>Server Actions</strong>, edge/runtime primitives (Vercel/AWS CloudFront).</li><li class="leading-relaxed"><strong>Prisma/Drizzle</strong>; <strong>tRPC</strong> or <strong>GraphQL</strong>; Zod/JSON schema; feature flags/experimentation.</li><li class="leading-relaxed">Realtime UX (WebSockets/SSE), optimistic updates, background revalidation.</li><li class="leading-relaxed"><strong>Celery/RQ</strong>, event sourcing, or state-machine libs (e.g., Temporal, Dagster, Prefect, XState).</li><li class="leading-relaxed">Stripe (subscriptions, metered usage, webhooks) and customer-visible billing pages.</li><li class="leading-relaxed">CI/CD (GitHub Actions), IaC (Terraform), and basic cost/perf dashboards.</li><li class="leading-relaxed">Search/retrieval familiarity (OpenSearch/Elasticsearch) and simple relevance tuning.</li><li class="leading-relaxed">Testing: Playwright (e2e), Vitest/Jest, pytest; accessibility checks.</li></ul><h3 class="text-xl md:text-2xl font-bold mt-8 mb-3 text-gray-800">Technology</h3><p class="my-4 text-gray-700 leading-relaxed">Language Models, Opensearch/Elasticsearch, Next.js (typescript), Python, FastAPI, AWS, Docker, Celery workers, Playwright, Supabase, Stripe</p>

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<h3 class="text-xl md:text-2xl font-bold mt-8 mb-3 text-gray-800">About the Role</h3><p class="my-4 text-gray-700 leading-relaxed">The Area Sales Manager is responsible for leading a team to drive business revenue growth within their designated area. This involves cultivating relationships with key merchants, overseeing sales operations, fostering collaboration with other departments, and ensuring seamless execution within the area. They also analyze market trends, pinpoint challenges, and establish strategic priorities. 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The team consists of Account Managers (AM), Account Executive Leads, and Account Executives (AE) who actively engage with merchants on the ground to understand real business conditions, strengthen relationships, and identify opportunities to drive sales performance and merchant growth within their designated areas.</p><h3 class="text-xl md:text-2xl font-bold mt-8 mb-3 text-gray-800">About GoTo Group</h3><p class="my-4 text-gray-700 leading-relaxed">GoTo Group is the largest digital ecosystem in Indonesia with its mission to “Empower Progress’ by offering technological infrastructure and solutions for everyone to access and thrive in the digital economy. The GoTo ecosystem consists of on-demand transportation services, food and grocery delivery, logistics and fulfillment, as well as financial and payment services through the Gojek and GoTo Financial platforms.It is the first platform in Southeast Asia that hosts these crucial cases in a single ecosystem, capturing the majority of Indonesia’s vast consumer household.</p><h3 class="text-xl md:text-2xl font-bold mt-8 mb-3 text-gray-800">About Gojek</h3><p class="my-4 text-gray-700 leading-relaxed">Gojek is Southeast Asia’s leading on-demand platform and pioneer of the multi-service ecosystem with over 2.5 million driver partners across the regions offering a wide range of services such as transportation, food delivery, logistics and more. With its mission to create impact at scale, Gojek is committed to resolving consumer problems and raising standards of living by connecting consumers to the best providers of goods and services in the market.</p><h3 class="text-xl md:text-2xl font-bold mt-8 mb-3 text-gray-800">About GoTo Financial</h3><p class="my-4 text-gray-700 leading-relaxed">GoTo Financial accelerates financial inclusion through its leading financial services and merchants solutions. Its consumer services include GoPay and GoPayLater and serve businesses of all sizes through Midtrans, Moka, GoBiz Plus, GoBiz, and Selly. With its trusted and inclusive ecosystem of products, GoTo Financial is open to new growth opportunities and aims to empower everyone to Make It Happen, Make It Together, Make It Last.</p><p class="my-4 text-gray-700 leading-relaxed"><em>GoTo and its business units, including Gojek and GoToFinancial ("GoTo") only post job opportunities on our official channels on our respective company websites and on LinkedIn. GoTo is not liable for any job postings or job offers that did not originate from us. You should conduct your own due diligence to prevent being victims of any fake job scams, if they did not originate from GoTo's official recruitment channels.</em></p><p class="my-4 text-gray-700 leading-relaxed"><em>#LI-ONSITE</em></p>

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This assessment gives us an idea of your C++ skills- Companies that evaluate this skillset in interviews: Rockstar Games, Ubisoft, Mayhem Studios, etc.- 10 Multiple Choice questions- Average time to complete: 7 to 10 minutes

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Founding Engineer — Full-Stack

Founding Engineer — AI Research Agents (Full-Stack)

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