Software Engineer (Backend)

Why Salesfinity

Salesfinity is redefining how revenue teams prospect, call, and convert pipeline.

Our AI Parallel Dialer enables reps to initiate multiple outbound calls at once, auto-filter voicemails, and prioritize live connects—delivering 5.2× more conversations per rep per day.

We’re scaling fast, with real customers, real revenue, and product-led momentum. And we're just getting started.

Join a small, sharp engineering team that ships weekly, solves hard real-time challenges, and builds tech that directly drives ARR.

What You’ll Do

Own product — not tickets. You will:

• Build new AI-powered modules end-to-end across our TypeScript/NestJS backend & AWS serverless stack
• Scale real-time calling infrastructure processing thousands of concurrent dials, conversations, and events
• Architect & optimize event-driven pipelines (BullMQ, SQS/SNS, WebSockets, Deepgram/AI integrations)
• Own observability — logs, metrics, alerts, performance tuning, auto-healing mechanisms
• Improve deployment + runtime safety with CI/CD automation, IaC, and zero-downtime rollouts
• Collaborate directly with founders + users to turn raw GTM insights into shippable products
• Raise the bar via code reviews, pairing, and helping us build a world-class engineering culture

You’ll have huge scope and direct business impact. If you love autonomy × accountability, you’ll thrive here.

Tech Stack

• Languages: TypeScript
• Framework: NestJS (modular monolith evolving into microservices)
• Infra: AWS (Lambda, ECS/Fargate), Terraform, CloudWatch, S3, CloudFront
• Data: MongoDB, Redis
• Queues / Events: SQS/SNS, BullMQ, WebSockets
• Integrations: Twilio Voice, Deepgram ASR, HubSpot/Salesforce APIs

We also lean heavily on LLM orchestration and real-time telephony workloads — a playground for builders who like tough engineering problems.

Must-Have Experience

• 3+ years building and operating production SaaS backends

• Strong expertise in TypeScript and modern Node/NestJS patterns

• Proven ability to architect and run cloud-native workloads (AWS preferred)

• CI/CD, testing rigor, and “you build it, you run it” mindset

• Real-time or high-throughput system design experience (queues, event streams)

• Clear communicator — able to explain tradeoffs and drive alignment quickly

• Startup/ownership DNA — willing to jump into ambiguity and deliver clarity

Bonus Points

• Telephony or real-time communication (WebRTC, SIP, Twilio)
• AI/ML or speech-to-text utilization in production
• High-scale MongoDB optimization (sharding, indexing strategies)
• Experience in calling, VOIP, or GTM tech stacks
• Prior 0→1 product experience where you shipped iconic features with tiny teams

What Success Looks Like (12 Months)

✅ You’ve owned and shipped multiple customer-loved features

✅ Our dialing infrastructure is measurably faster, safer & more observable

✅ Engineering velocity is up; incidents & toil are down

✅ You’re a “glue person” — trusted by engineers, product, GTM, and customers

✅ You feel real ownership and see yourself shaping the next 5 years of Salesfinity

Compensation & Benefits

• Competitive salary + early-stage equity
• Remote-first across North America
• Health benefits + home office + latest hardware
• Annual learning & growth budget
• Company offsites and a culture of candor + kindness + bias-for-action