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Flex · 2 days ago

Staff Software Engineer, Agentic Integrations

United States

Full-time

Remote

Senior Level, Lead/Staff

$221K/yr - $262K/yr

6+ years exp

Flex is a growth-stage FinTech company headquartered in NYC, focused on creating a better rent payment experience. They are seeking a Staff Software Engineer to join their Partner Engineering organization and help build their next-generation Agentic payments platform.

AppsBillingFinancial ServicesFinTechSoftware

H1B Sponsor Likely

Responsibilities

Help shape the technical roadmap for the team, working across our APIs, SDKs, and Web experiences to power our Agentic platform & user experiences

Work with teams across the organization including Engineering, Product, Design, Infrastructure, Sales, Partner and Customer Success to deliver products that wow our customers and drive business goals

Execute work as an individual, and build products that allow for flexibility as we evolve our product offerings

Qualification

Software engineeringLLMs & Agentic workflowsAsynchronous programmingCI/CD systemsNetworking protocolsMentoring junior engineersCommunicatorCross-functional collaboration

Required

Minimum of 6 years experience in software engineering

Experience leading the delivery of multiple highly impactful products end to end, on time with a high quality bar

Experience working with technical and non-technical stakeholders, successfully aligning and setting expectations on scope and delivery

Ability to drive yourself and your team to bring quality and consistency to their code and architecture, without compromising velocity

Ability to grow in a fast-paced and dynamic environment that will challenge you to always bring your best

Ability to work on a globally-distributed team with a high degree of ownership

Excellent written and verbal communicator, with experience in cross-functional collaboration

Preferred

Experience using LLMs & Agentic workflows to power consumer experiences

Skilled at elevating team standards through best practices, and mentoring junior engineers

Experience building out pipelines that use LLMs to generate code from prompts

Experience fine tuning LLMs to improve outcomes in an AI powered product

Experience coupling LLM powered workflows with traditional programing processes to improve product outcomes

Deep knowledge of networking protocols, request routing, WebSockets, and browser fingerprinting techniques

Experience with asynchronous programming & scalable architectures (Python asyncio, Twisted, Golang, Node.js)

Proficient in CI/CD systems (preferably GitHub Actions), git, and automation

Benefits

Competitive medical, dental, and vision available from Day 1

Company equity

401(k) plan with company match (our company match kicks off at the beginning of 2026)

Unlimited paid time off + 13 company paid holidays

Parental leave

Flex Cares Program

Free Flex subscription

Competitive compensation + company equity

Unlimited PTO

Company

Flex

Glassdoor3.9

Flex enables people to pay rent bills on a schedule that fits their personal finances.

Founded in 2019

New York, New York, USA

201-500 employees

https://getflex.com

H1B Sponsorship

Flex has a track record of offering H1B sponsorships. Please note that this does not guarantee sponsorship for this specific role. Below presents additional info for your reference. (Data Powered by US Department of Labor)

Distribution of Different Job Fields Receiving Sponsorship

Represents job field similar to this job

Trends of Total Sponsorships

2025 (1)

2024 (1)