Lead / Senior Software Engineer (Full Stack)

Job Description

Title: Lead / Senior Software Engineer (Full Stack)

Company Name: AdsFixter

Vacancy: 2

Age: At least 28 years

Job Location: Barishal

Salary: Tk. 40000 - 70000 (Monthly)

Experience:

• At least 3 years

• Bachelor of Science (BSc) in Computer Science
• Bachelor of Science (BSc) in Software Engineering

• Bachelor's degree in Computer Science, Software Engineering, or related field

• At least 3 years

• Age At least 28 years
• Only Male

Technical Skills (Mandatory):

• 3+ years of professional experience in full-stack development
• Expert-level proficiency in Next.js, React.js including hooks, context API, and state management (RTK Query), Redux
• Advanced knowledge of Next.js, NestJS, Node.js, Express.js, and RESTful API
• development
• Hands-on experience with React Flow or similar visual workflow libraries
• Proven experience with SDK development for JavaScript/TypeScript environments
• Strong experience with prompt engineering and AI API integration (Claude, GPT, or similar)
• Experience with microservice, modular, MVC, MVVM architecture
• Working with Canvas based UI component flow builder (React Flow)
• Experience with chatbot or conversational AI platforms
• At least 1 year of experience working as a team lead
• Proficient in TypeScript, modern JavaScript (ES6+), and asynchronous programming
• Strong database skills with PostgreSQL, MongoDB (database design, normalization, indexing) and Redis
• Experience with webhook implementations and event-driven architectures
• Familiarity with messaging platform APIs (WhatsApp Business, Telegram, Meta
• Messenger)
• Experience with Git, version control workflows, and collaborative development
• International payment processor like Stripe integration and local payment processor like SSLCommerz or Bkash

Leadership & Management Skills:

• Demonstrated experience leading development teams and mentoring developers
• Strong project management skills with ability to coordinate multiple workstreams
• Excellent communication skills for technical and non-technical stakeholders
• Experience with Agile/Scrum methodologies and sprint planning

Preferred Qualifications:

• Experience with Kubernetes, Docker, and cloud platforms (AWS/GCP/Azure)
• Knowledge of GitHub Actions for CI/CD automation
• Knowledge of NLP, machine learning concepts, and AI model evaluation
• Experience building conversational AI or chatbot platforms

Position Overview:

We are hiring an experienced Senior / Lead Software Engineer to join our team at Adsfixter. We are looking for strong full-stack developers who are passionate about building modern platforms and exploring innovative technologies. This position is open for candidates with or without leadership experience. If you have proven leadership or project management skills, you may take on the Lead role and guide our development team while driving technical decisions. If you don’t have leadership experience but are a strong senior-level developer, you are equally encouraged to apply and contribute as a Senior Software Engineer. In this role, you will help build our next-generation AI-powered conversational platform and play an important part in shaping our technical roadmap.

Working Days: 6 days/week (Friday off)

Job Type - On-site

Key Responsibilities

Technical Leadership & Development:

• Lead the architecture and development of full-stack applications using Next.js, NestJS, and modern frameworks
• Design and implement the unified JSON flow structure for our conversational AI platform using prompt engineering leveraging LLM APIs like Claude Sonnet 4.5
• Integrate Claude Sonnet 4.5 API and other AI services with optimal performance and error handling for visual flow builder for chatbot
• Build and maintain visual flow builder using React Flow library with drag-and-drop functionality
• Develop comprehensive SDKs for JavaScript/TypeScript, web embedding, and mobile platforms
• Implement webhook systems with authentication, retry logic, and event-driven
• architecture
• Create platform integrations for WhatsApp, Telegram, and Meta Messenger using their respective APIs
• Develop and maintain full-stack applications using Next.js, React.js, Node.js, and
• TypeScript
• Build responsive and intuitive user interfaces with modern React patterns and best practices
• Implement RESTful APIs and backend services with Node.js and Express.js
• Work with React Flow library to create visual workflow editor components
• Integrate with PostgreSQL/MongoDB databases, including schema design, query
• optimization, and normalization

Project Management & Team Leadership

• Act as Associate Project Manager, coordinating development activities, sprint planning, and daily standups
• Mentor and guide junior developers, conducting code reviews and providing technical direction
• Break down complex projects into manageable tasks and assign them to team members
• Monitor project progress, identify bottlenecks, and implement solutions to keep
• development on track
• Collaborate with stakeholders to gather requirements and translate them into technical specifications
• Establish and enforce coding standards, best practices, and development workflows
• Motivate and inspire junior team members to achieve high performance and professional growth
• Manage project timelines, resources, and deliverables to ensure successful project completion

AI & Prompt Engineering

• Design and optimize prompts for Claude Sonnet 4.5 to achieve high-quality
• conversational responses
• Implement context management strategies for maintaining conversation state and memory
• Develop AI-powered features including intent recognition, entity extraction, and
• sentiment analysis
• Optimize API usage to balance performance, cost, and response quality
• Integrate Claude Sonnet 4.5 and Perplexity API into application features with proper error handling
• Develop AI Prompt based automated flow-builder in the canvas for the user dashboard
• Implement conversation flow logic using the unified JSON structure

Infrastructure & DevOps

• Design scalable architecture using PostgreSQL/MongoDB, Redis, and message queues (RabbitMQ/Kafka)
• Implement CI/CD pipelines using GitHub Actions and automated testing frameworks
• Ensure system security, data protection, and compliance with industry standards
• Monitor application performance and implement optimization strategies
• Manage Kubernetes deployments and Azure cloud infrastructure
• Configure and maintain cloud platforms for scalability and reliability

SDK & Integration Development

• Contribute to SDK development for JavaScript/TypeScript and web embedding
• Implement webhook endpoints with authentication and event processing
• Develop integrations with messaging platforms (WhatsApp, Telegram, Meta Messenger)
• Create and maintain API documentation for developers

Code Quality & Collaboration

• Write clean, maintainable, and well-documented code following team standards
• Participate in code reviews and provide constructive feedback to peers
• Write unit tests and integration tests to ensure code reliability
• Collaborate with team members using Git and version control best practices
• Debug and resolve technical issues in production and development environments
• Participate in sprint planning, daily standups, and team meetings

Monthly Salary: BDT (40k - 70K)/ per month Probation Period: First 3 months Festival Bonuses: 2 Eid festival bonuses (BDT salary 50% each) Sick Leave:14 days per year Casual Leave:10 days per year Notice Period:15 days (during probation) | 3 months (after confirmation) Opportunity to work on cutting-edge AI and conversational platforms Leadership role with growth potential to senior management positions Collaborative and innovative work environment Professional development and training opportunities Exposure to latest technologies and best practices