Senior Software Engineer

About the role

Job DescriptionSenior Software EngineerRole details

Salary: $180K - $200K

Hybrid work policy: 3 days in-office in Midtown, New York City (Tower 49, near Grand Central Station)

Full-time position

Location: New York, NY

Tech stack: Python, AWS, AWS Lambda, AWS Step Functions, REST APIs, Microservices, Databases, React, Serverless, Event-driven architecture, JSON, XML, CSV

Equity: Competitive equity

Visa sponsorship details: Not open to any visas (e.g. US citizen, Green Card holders)

About this role

We are looking for a Senior Software Engineer with 5+ years of experience to join a small, high-performing AI startup building the data backbone and automation platform for construction owners. You'll be a deeply technical IC who thrives in early-stage environments, shipping production backend services, making architectural decisions, and mentoring junior engineers, with a clear path to grow into the Lead Engineer role within 3-6 months. We need someone who has been a founding engineer or early hire at a B2B SaaS startup, is comfortable wearing multiple hats, and brings a product mindset alongside deep Python and AWS expertise.

What will you be doing?

Designing, building, and operating production-grade backend services and data pipelines using Python and AWS (Lambda, Step Functions, serverless architectures)

Making critical architectural and system design decisions while leveraging AI coding tools (like Claude) to accelerate development

Owning features end-to-end from backend to front end (React), eliminating handoffs and shipping faster as a full-stack contributor in a 90% backend / 10% frontend codebase

Engaging directly with customers and forward-deployed engineers to understand workflows, clarify requirements, and translate ambiguous needs into shipped software

Mentoring junior engineers through code reviews, design discussions, and pairing.

RequirementsDealbreaker

Work experience

Must have: Founding engineer or early employee at a B2B SaaS startup (first ~10 hires,​ seed/Series A stage)

Hard skills

Must have: Advanced Python expertise for production backend systems

Miscellaneous

Must have: Based in or near New York City;​ 3 days/week in-​office (Midtown)

Baseline

Seniority

Required: 3 -​ 6 years of experience in backend software engineering

Work experience

Required: Owned production backend systems end-​to-​end (not just contributed)

Education

Required: BS in Computer Science or related STEM degree

Hard skills

Required: Strong hands-​on AWS experience (Lambda,​ Step Functions,​ serverless)

Soft skills

Required: Product-​minded;​ willing to talk to customers and clarify requirements directly

Nice-to-have

Work experience

Nice to have: Prior tech lead or mentorship role guiding junior engineers

Education

Nice to have: A lack of degree is acceptable,​ only if strong startup engineering track record

Hard skills

Nice to have: Experience with AI coding tools and agentic development workflows