Full Stack Developer

We're looking for an experienced Full-Stack Engineer who can architect and build AI-powered agent systems from the ground up. You'll work across the entire stack—from designing scalable backend services and LLM orchestration pipelines to creating frontend interfaces for agent interactions through widgets, bots, plugins, and browser extensions.

You should be fluent in modern backend technologies, AI/LLM integration patterns, and frontend development, with strong systems design thinking and the ability to navigate the complexities of building reliable AI applications.

Note: This is an on-site, 6-day-a-week role. We are in a critical product development phase where sthe peed of iteration directly determines market success. At this early stage, speed of execution and clarity of thought are our strongest moats, and we are doubling down on both as we build through our 0→1 journey.

WHAT YOU BRING:

You take ownership of complex technical challenges end to end, from system architecture to deployment, and thrive in a lean team where every person is a builder. You maintain a strong bias for action, moving quickly to prototype and validate AI agent capabilities while building production-grade systems. You consistently deliver reliable, scalable solutions that leverage AI effectively — whether it's designing robust prompt chains, implementing RAG systems, building conversational interfaces, or creating seamless browser extensions.

You earn trust through technical depth, reliable execution, and the ability to bridge AI capabilities with practical business needs. Above all, you are obsessed with building intelligent systems that actually work. You think deeply about system reliability, performance, cost optimization, and you're motivated by creating AI experiences that deliver real value to our enterprise customers.

WHAT YOU WILL DO:

Your primary responsibility (95% of your time) will be designing and building AI agent systems across the full stack. Specifically, you will:

• Architect and implement scalable backend services for AI agent orchestration, including LLM integration, prompt management, context handling, and conversation state management.
• Design and build robust AI pipelines — implementing RAG systems, agent workflows, tool calling, and chain-of-thought reasoning patterns.
• Develop frontend interfaces for AI interactions including embeddable widgets, Chrome extensions, chat interfaces, and integration plugins for third-party platforms.
• Optimize LLM operations — managing token usage, implementing caching strategies, handling rate limits, and building evaluation frameworks for agent performance.
• Build observability and monitoring systems for AI agents, including prompt versioning, conversation analytics, and quality assurance pipelines.
• Collaborate on system design decisions around AI infrastructure, model selection, vector databases, and real-time agent capabilities.
• Stay current with AI/LLM developments and pragmatically adopt new techniques (function calling, multi-agent systems, advanced prompting strategies) where they add value.

BASIC QUALIFICATIONS:

• 4–6 years of full-stack development experience, with at least 1 year working with LLMs and AI systems.
• Strong backend engineering skills: proficiency in Node.js, Python, or similar; experience with API design, database systems, and distributed architectures.
• Hands-on AI/LLM experience: prompt engineering, working with OpenAI/Anthropic/Google APIs, implementing RAG, managing context windows, and optimizing for latency/cost.
• Frontend development capabilities: JavaScript/TypeScript, React or Vue, browser extension development, and building embeddable widgets.
• Systems design thinking: ability to architect scalable, fault-tolerant systems that handle the unique challenges of AI applications (non-determinism, latency, cost).
• Experience with AI operations: prompt versioning, A/B testing for prompts, monitoring agent behavior, and implementing guardrails.
• Understanding of vector databases, embedding models, and semantic search implementations.
• Comfortable working in fast-moving, startup-style environments with high ownership.

PREFERRED QUALIFICATIONS:

• Experience with advanced LLM techniques: fine-tuning, function calling, agent frameworks (LangChain, LlamaIndex, AutoGPT patterns).
• Familiarity with ML ops tools and practices for production AI systems.
• Prior work on conversational AI, chatbots, or virtual assistants at scale.
• Experience with real-time systems, WebSockets, and streaming responses.
• Knowledge of browser automation, web scraping, or RPA technologies.
• Experience with multi-tenant SaaS architectures and enterprise security requirements.
• Contributions to open-source AI/LLM projects or published work in the field.

WHAT WE OFFER:

• Competitive salary + meaningful equity.
• High ownership and the opportunity to shape product direction.
• Direct impact on cutting-edge AI product development.
• A collaborative team that values clarity, autonomy, and velocity.

Description

We are looking for a Java Developer with experience in building high-performing, scalable, enterprise-grade applications. You will be part of a talented software team that works on mission-critical applications. Java developer roles and responsibilities include managing Java/Java EE application development while providing expertise in the full software development lifecycle, from concept and design to testing. Java developer responsibilities include designing, developing and delivering high-volume, low-latency applications for mission-critical systems.

Responsibilities

·      Contribute in all phases of the development lifecycle

·      Write well designed, testable, efficient code

·      Ensure designs are in compliance with specifications

·      Prepare and produce releases of software components

·      Support continuous improvement by investigating alternatives and technologies and presenting these for architectural review

Requirements

·      BS/MS degree in Computer Science, Engineering or a related subject

·      Proven hands-on Software Development experience

·      Proven working experience in Java development

·      Hands on experience in designing and developing applications using Java EE platforms

·      Object Oriented analysis and design using common design patterns.

·      Profound insight of Java and JEE internals (Class loading, Memory Management, Transaction management etc)

·      Excellent knowledge of Relational Databases, SQL and ORM technologies (JPA2, Hibernate)

·      Experience in the Spring Framework

·      Experience as a Sun Certified Java Developer

·      Experience in developing web applications using at least one popular web framework (JSF, Wicket, GWT, Spring MVC)

·      Experience with test-driven development

About the job

About Reflektive's Engineering Team

We are seeking a Senior Software Engineer, Front End to help scale Reflektive to being the market leader for employee performance management. The main question to be answered: Can you help a

company scale?

Reflektive has major initiatives to tackle in the next year. Initiatives range from internal scaling, security, engagement, new verticals, pervasive technologies, research and development, data and

analytics, and customer tools. Reflektive’s Senior Software Engineer will contribute in their area of specialization. S/he will help us solve complex design challenges and mature our platform to handle

increasing traffic and scale.

You'll join a lean, prolific team where everyone, including you, is active in the product-defining and development process (where deploying new features every 2 weeks is common). You'll know the

customers we're talking to, and the needs of each one. As a result, you know where your initiative and drive can best make a difference (and be recognized!)

Our engineering team consists of developers from a wide array of backgrounds. Our team primarily focuses on Rails and Javascript, but is always ready to use the best tool for the job when it makes

sense. Following Scrum practices, we work closely with the Product Management team to develop features that focus on empowering and developing employees. Our team is a tight knit, friendly

group of engineers that are dedicated to learning from and teaching to each other. Team members regularly contribute to and optimize our engineering practices and processes. Our team wants to

make software engineering fun, easy, and fulfilling, so we've come up with a set of values that we

apply to our software every day: Simple, Flexible, Consistent, Predictable, Efficient, and Pragmatic.

Responsibilities

● Depending on your specialization, projects/initiatives may include: Security, scaling distributed systems, working on our core services related to user management, building out new verticals, guiding new engagement features, scaling traffic/imports/exports,

and managing APIs.

● Work extremely cross-functionally across Engineering and Product Management.

● Deliverable: (30 days) Own a feature; possibly being paired with another engineer. (60days) Own and drive a new initiative. (90 days) Bring that initiative to production.

Desired Skills and Experience

• Expert proficiency in Java/Kotlin, Kafka/Pulsar, SQL, Docker and kubernetes.
• Overall 4+ years of experience as Java full stack developer using any modern frameworks.
• Strong knowledge on Data structure and Algorithm knowledge
• Previous experience working in ReactJS/AngularJS (2+ years)
• Knowledge of Analytics and LookerML would be added plus.
• Exposure to cloud environment AWS.
• Knowledge of unit testing frameworks including Junit.
• Startup experience is strongly desired.
• You learn quickly, you’re adaptable and versatile.
• Experience in an Agile and Scrum environment.

About Reflektive

Forward-thinking organizations use Reflektive’s people management platform to drive employee performance and development with Real-Time Feedback, Recognition, Check-Ins, Goal Management,

Performance Reviews, 1-on-1 Profiles, and Analytics. Reflektive’s more than 500 customers include Blue Origin, Comcast, Instacart, Dollar Shave Club, Healthgrades, Wavemaker Global, and Protective

Life. Backed by Andreessen Horowitz, Lightspeed Venture Partners, and TPG Growth, Reflektive has raised more than $100 million to date, and was ranked the 13th Fastest Growing Company in North

America on Deloitte’s 2018 Technology Fast 500TM.

We are an equal opportunity employer and value diversity at our company. We do not discriminate based on race, religion, color, national origin, gender, sexual orientation, age, marital status,

veteran status, or disability status.

Who We are:

Paxcom a leading Digital Solution Provider is a part of Paymentus now, a leading electronic bill payment provider. PaymentUs leads the North American marketplace in electronic bill payment solutions and have recently signed a partnership with Paypal, Alexa and Walmart. We are looking for passionate programmers skilled in Java, Python, Angular, NodeJS, Python, Jenkins, Postgresql, Docker, Kubernetes, Spark and AWS to join our development team.

For more details, please visit https://paxcom.ai/

Why Join Us?

Get a chance to contribute and get recognition from Day 1.

You hate micromanagement and are able to take your decision independently. 

Enjoy flexible and relaxed wok environment.

Work 5 days a week (Enjoy work-life balance).

A friendly, Supportive, Professional and achievement-oriented management team

Competitive remuneration.

An opportunity to learn new things every day.

You Enjoy:

Ideal resource should be from Java background with a minimum of 3+ years’ experience in Java technologies.

Should have extensive experience working with Spring, Any ORM and Restful Web services.

Strong experience building, designing, and consuming Restful web services.

Must have experience with spring boot/Spring MVC

1+ years’ experience with one or more JS frameworks: NodeJS/Express, Angular, React, ExtJS, Vue is preferred

Experience / Knowledge of Agile Scrum methodology.

Should have used GIT and be self-dependent on resolving merge conflicts.

Should be familiar with build tool like Maven or Gradle.

Excellent verbal and written communication skills.

Ability to handle small teams and mentor them.

Leader, Doer & Architect for Enterprise Java applications

Experience of payment card industry is a plus.

Tech Stack:

Java 8+

Microservices

REST 

Spring Framework 4/5

MySQL 5.6/Oracle

Nice To have (CPM Scheduling, Angular/React, NodeJS)

Linux, GIT, Docker, kubernetes, Cloud, AWS,Kafka

Building tools like Maven, Ant, Gulp

Interview Kickstart is one of the leading platforms helping Software Engineers prepare for tough technical interviews. Over the last 5 years we have helped over 3000 engineers Nail the toughest technical interviews on the planet. We are successful, profitable, and have a vision of building the world's largest Career Upleveling platform. 

We are looking for top-notch, motivated engineers to come join our growing team at IK. 

Who you are

• You have 2 - 7 years experience. 
• You love the buzz of a highly productive and fast moving team. 
• You have a github profile that you want to show off. 
• You love coding and look forward to taking on complex, abstract features. 
• You don't care about front end, backend kinda titles. You like working anywhere in the "stack". 
• You are looking to grow fast with a company that's on a rapid growth path.

What will excite us

• Previous startup experience or experience being part of early teams.
• Experience with the Django & Python universe. 
• Experience with both Relational and NoSQL DBs. 
• Competitive Programming experience. 
• A keen desire to problem solve, brainstorm and debate during the interview. 

What will excite you

• Complete ownership
• Experiment, fail and learn.
• High pedigree, high caliber team. 
• Contribute to every area of our business. Have a real impact with your work. 
• Top of the line compensation.

Our interview process is designed to help you show the best version of yourself. Once your candidature is finalized, we'll send you a short video explaining the interview process.

Look forward to speaking with you soon!