Senior Agent Engineer (LangChain)

Focused; Denver (CO); Hybrid; USD 120,000 - 170,000; Full time

Benefits offered by this job

In-office Denver

Competitive compensation

Job summary

Focused is seeking a Senior Agent Engineer specializing in LangChain to lead end-to-end AI-enabled software delivery for diverse client projects. You will pair program daily, mentor engineers, and shape architecture decisions to scale across back-end services and modern web UIs.

You bring hands-on full-stack experience, LangChain or similar agent frameworks, and fluency with Python, Node, Java, React, and Next.js.

Qualifications

• Hands-on, full stack engineer with collaborative, agile experience.
• Experience leading engineering teams and mentoring developers.
• Familiar with LangChain or similar agent frameworks and AI-native design.

Responsibilities

• Lead end-to-end delivery across the stack from backend to modern web UIs.
• Pair program daily with teammates and clients to share knowledge.
• Coach developers and model healthy engineering culture.
• Influence architectural decisions for scalability and performance.

Skills

LangChain experience

Full stack engineer

Mentoring / leadership

TDD / pairing

Cross-functional collaboration

Tools

LangChain

LangGraph

LangSmith

Python

Node.js

Java

React

Next.js

Job description

/Engineering# Senior Agent Engineer (LangChain)Denver, Colorado, United StatesFull-time**Who we are**At Focused, we move quickly to deliver quality software that achieves client outcomes and meets their customer's needs. We strategically partner with our clients to leverage our expertise in design and software, while our clients bring their own domain expertise. We work with a variety of clients from different industries, collaborating as we get new products to market, modernizing legacy systems, or helping teams learn the skills they need to be successful.**Our values*** *Listen first* - We are experts in product practices but life long learners in the domain of our customers. We research, collaborate, and understand.* *Learn why* - We ask questions and talk to users to understand problem spaces, objectives, and goals, which allows us to deeply invest and drive towards the outcomes of our clients.* *Love your craft* - We love diving into a variety of domains and solving problems. We take pride in delivering value, in communicating progress, and guiding our clients to success.At Focused, our Engineers are both practitioners and experts in their craft. This role would play a crucial role in shaping and implementing engineering best practices and ensuring the successful delivery of complex software projects. With clients, we develop trust and influence - we are unintimidated and unintimidating. With colleagues, we set the standard for how we deliver success for clients.* Build AI-enabled applications leveraging LangChain and LLMs to deliver meaningful, production-ready outcomes for clients.* Deep expertise in LangChain, LangGraph and LangSmith* Lead teams through end-to-end delivery across the stack, from backend services to modern web UIs.* Pair program daily with teammates and clients to share knowledge, improve code quality, and grow together.* Practice TDD and continuous refactoring to ensure code is reliable, maintainable, and understandable.* Guide architecture decisions to support scalability, observability, and performance.* Collaborate closely with designers, product managers, and stakeholders to continuously deliver valuable software.* Coach developers on the team through pairing, mentoring, and modeling healthy engineering culture.* Influence technical direction beyond the team, working across client orgs and Focused's internal practices to share lessons, shape approaches, and raise the collective bar.* Stay curious through experimenting with new patterns in the GenAI space, share what works (and what doesn't), and help evolve how we build AI-powered software.### **We are excited about you, because you:*** You're a hands-on, full stack engineer with a strong track record of delivering software in collaborative, agile environments.* You've worked with LangChain (or similar agentic frameworks), and understand how to architect AI-native systems responsibly and effectively.* You have experience leading engineering teams and feel confident mentoring and supporting other developers.* You believe that code quality matters, and that TDD and pairing help build better systems *and* stronger teams.* You've worked across multiple languages or frameworks (e.g., Python, Node, Java, React, Next.js) and are pragmatic about tool selection.* You're excited about what's happening in the AI space but stay focused on delivering value.* You have experience navigating complex organizations, building bridges across functions, and helping teams adopt modern development practices.* You're as comfortable in the code as you are in a client meeting and can translate technical risks and wins into language anyone can understand.* You love to share what you're learning and make the team around you better.**If you had worked at Focused over the last 3 months you may have*** Paired with a teammate to build a document Q&A system using LangChain and OpenAI APIs* Helped design an architecture that integrates LLM agents into a legacy enterprise workflow* Refactored a flaky test suite to support continuous delivery with confidence* Mentored a junior dev through their first pairing and TDD session* Built and deployed a full stack GenAI MVP with a React frontend and FastAPI backend* Facilitated an architecture spike to evaluate vector database options for semantic search* Contributed a new section to our internal AI playbook* Helped write this job req**What to know before you apply*** This role will require being in the Denver office three days per week and up to 20% travel within the United States.* Focused is unable to sponsor or take over sponsorship of the employment Visa process at this time.* The Denver base salary range for this role is $120,000 - $170,000.LocationDenver, Colorado, United States02Answers to a few short questions about this role### /About this role\\* \\*If you believe you belong to any of the categories of protected veterans listed below, please indicate by making the appropriate selection. As a government contractor subject to the Vietnam Era Veterans' Readjustment Assistance Act (VEVRAA), we request this information in order to measure the effectiveness of the outreach and positive recruitment efforts we undertake pursuant to VEVRAA. Classification of protected categories is as follows:A \"disabled veteran\" is one of the following: a veteran of the U.S. military, ground, naval or air service who is entitled to compensation (or who but for the receipt of military retired pay would be entitled to compensation) under laws administered by the Secretary of Veterans Affairs; or a person who was discharged or released from active duty because of a service-connected disability.A \"recently separated veteran\" means any veteran during the three-year period beginning on the date of such veteran's discharge or release from active duty in the U.S. military, ground, naval, or air service.An \"active duty wartime or campaign badge veteran\" means a veteran who served on active duty in the U.S. military, ground, naval or air service during a war, or in a campaign or expedition for which a campaign badge has been authorized under the laws administered by the Department of Defense.An \"Armed forces service medal veteran\" means a veteran who, while serving on active duty in the U.S. military, ground, naval or air service, participated in a United States military operation for which an Armed Forces service medal was awarded pursuant to Executive Order 12985./Benefits## Built to keep you happy, not just keep you here.### Honest compensation### Honest compensationSenior Agent Engineer (LangChain)Denver, Colorado, United States