Principal Backend Engineer — Own Nexara’s Revenue-Critical Systems

@webbookstudio

Hi there, We understand that Nexara Labs USA is seeking a seasoned Principal Backend Engineer to develop and harden critical systems, including customer/lead ownership, permissions, and CRM writes, with a focus on reliability, security, and data integrity. With 17 years of experience in web development and a strong background in Node/TypeScript, APIs, databases, and security, Webbook Studio is well-equipped to handle this challenge. Our team has delivered multiple high-performance backend systems, including a custom CRM application for a luxury leather retailer and a secure e-commerce platform with integrated payment systems. Can you elaborate on the existing technical infrastructure and how our team can ensure a seamless integration with the current systems? Feel free to message us to discuss the details! — Webbook Studio

@ambar

BACKEND You need someone who can strengthen a live system without breaking revenue-critical workflows. My first three audits would be: • CRM state, ownership and permission rules. • Quote/order flow and database integrity. • Payment webhooks, reconciliation and duplicate handling. The most revenue-critical system I have personally worked on is the transactional booking platform for Mysuru Zoo and Anna Zoological Park, including payments, APIs and WhatsApp workflows. I also work extensively on PHP/CRM/ERP systems, APIs and production data workflows where failures must be recoverable. I can take end-to-end ownership of backend logic, APIs, integrations, testing, deployment and ongoing fixes. I personally handle the development; I don't outsource it. Ambar Shome B Tech Ex-TCS Six Sigma Green Belt Google Certified Cloud Architect Total Experience : 22 years

@ahmadayaz

I am an experienced backend engineer with a focus on reliability and security, well-versed in NodeJS, TypeScript, API development, databases, cloud deployments, and security protocols. I have a track record of optimizing enterprise systems for performance and scalability and preventing critical bugs, ensuring data integrity. I will implement server-authoritative controls to safeguard the referral/commission system and adhere to strict security practices. I look forward to collaborating with Nexara Labs USA to build a robust revenue system aligned with your business goals.

@gotucat

Hi, I reviewed the requirement: harden revenue-critical backend systems for CRM writes, permissions, quote integrity, affiliate attribution, security, audit history, and deployment control. I’ll focus on Cloud Computing and Backend Development to make server-authoritative workflows, strengthen API Development with idempotent webhook handling, and enforce least-privilege role-based access. I’ll validate deduplication, ownership, source tracking, consent, and audit trails so there’s no second source of truth. I deliver reliable infrastructure with clean changes, rollback planning, and observability so production behavior is measurable and safe. Let’s discuss here now.

@diektech

Hi — Elias here from Miami. I understand you're looking for a Principal Backend Engineer to enhance your platform. The goal is to ensure robust performance and scalability while maintaining a seamless user experience. A common issue in systems like this is ensuring that backend processes can efficiently handle varying loads without compromising on speed or reliability. This often involves integrating various APIs and managing complex workflows. What usually matters most here is the architecture chosen to allow for future expansion and maintainability. My practical approach would involve structuring the backend with a focus on microservices, allowing independent scaling of components. This will ensure that your platform can grow without major overhauls. I have experience developing similar systems, particularly in cloud environments, which helps in optimizing performance and security. A few questions to better understand the scope: Q1 – What user roles will need to be supported, and how complex are the associated permissions? Q2 – Are there specific integrations with existing systems that are critical for your launch? Q3 – What are your expectations regarding scaling, both in terms of user load and feature expansion? Happy to go through the details and suggest the best technical approach. Looking forward to hearing from you.

@webperfection123

BACKEND I would begin by auditing API integrations for reliability and performance, permissions/RBAC configurations for security issues, and data integrity in your quoting logic. In my previous role, I owned a revenue-critical order management system responsible for processing payments and managing commissions. I ensured system resilience and accuracy through robust testing and documentation practices. I could effectively take ownership of the authentication and RBAC implementation, audit trail systems, and payment reconciliations. With over 10+ years of experience in backend engineering and a strong focus on systems design and integrity, I can help scale your systems efficiently. Looking forward to the opportunity to contribute to Nexara Labs. Best, Priyanka

@starttechno

Your revenue system needs correctness before convenience: canonical CRM/lead writes, deduplication, ownership, consent, attribution, permissions, audit history, and deployment control must remain reliable inside the existing product. I have 10+ years building production backends with Node/TypeScript, PHP/Laravel, MySQL/Postgres, REST APIs, authentication, payment integrations, and AWS deployments. My relevant work includes a multi-tenant CRM/API where I implemented server-side ownership rules, deduplication, role permissions, and audit logging, plus a transaction platform where I built webhook handling, payment state controls, and commission calculations. I can provide the two production examples and exact contributions through Freelancer. For Nexara, I would first map the current data flows and identify every client-trusted field. I would then make CRM writes canonical and transactional, add unique constraints and idempotency keys, enforce RBAC and named-account MFA, and move quote, referral, order, and commission decisions to the server. Attribution would be accepted only from validated campaign/referral records; order state would come from verified backend events, never browser payloads. Muhammad Saad

@anirudhat

The failure modes you're describing — duplicate leads, disputed ownership, commissions computed from client-supplied values, webhooks replayed into double writes — are the ones that quietly cost real money, and they get fixed at the database boundary, not in the UI. My approach is server-authoritative by default: pricing, attribution and commission derived only from server state, unique constraints and deterministic dedup keys enforced in the schema so a race can't create a second lead, idempotency keys on every webhook and integration write, and an append-only audit trail recording who changed what and when. Access control gets modelled as roles and explicit grants with MFA and a real offboarding path, not ad-hoc checks scattered through handlers. I work inside existing systems carefully — read first, migrate behind flags, keep rollback viable, never a second source of truth. I can start immediately.

@DeveloperStation

Hi, On a recent build I set up a secure CI pipeline with deterministic ingestion, the kind of boring reliability where inputs are validated server-side and nothing downstream trusts client state. Secure CI Pipeline: 5-star, "on point and helped get the app to a great start" On your point 3, the fix is to never accept client-supplied attribution or order totals as truth. Attribution gets stamped server-side from a signed session or first-touch cookie the server issued, commission is recomputed from the canonical order record at settlement, and every write goes through an idempotency key so replayed webhooks can't double-credit. We work through named accounts, MFA, least privilege, and company-controlled repos with documented handoff. Structure the first milestone around one acceptance test so you only release on a passing deliverable. Which system is the CRM writing to today? Adil

@ZohaibRoy

⭐⭐⭐⭐⭐ Principal Backend Engineer — Build Reliable Revenue Systems ❇️ Hi My Friend, I hope you're doing well. I reviewed your project needs and see you're looking for a Principal Backend Engineer. Look no further; Zohaib is here to help you! My team has worked on 50+ similar projects focusing on backend development. I will ensure robust systems for customer ownership, permissions, and data integrity while keeping everything secure and reliable. ➡️ Why Me? I bring 5 years of solid experience in backend engineering, focusing on Node.js, TypeScript, and database management. My expertise includes building secure APIs, ensuring data integrity, and managing cloud deployments. Additionally, I have a strong grip on integrations, security practices, and performance optimization. ➡️ Let's have a quick chat to discuss your project in more detail and let me show you examples of my previous work. I'm looking forward to it! ➡️ Skills & Experience: ✅ Node.js ✅ TypeScript ✅ API Development ✅ Database Management ✅ Security Practices ✅ Cloud Deployments ✅ Role-Based Access Control ✅ Data Integrity Management ✅ System Integration ✅ Performance Optimization ✅ Audit Trails ✅ Documentation Management Waiting for your response! Best Regards, Zohaib

@ajharul

✨ Hi, I will harden your CRM lead integrity using Node.js and TypeScript for this backend infrastructure platform. I previously implemented server-side attribution logic to block malicious referral gaming. Estimated timeline: 5 days Budget: $750 Let's discuss and get started. Ajharul

@corpmember29

Hello, I am a honest dedicated full time Principal Backend Engineer . I have carefully gone through your requirements and understand that you need a principal-level backend engineer to harden CRM/lead ownership, permissions, attribution, quote and commission integrity, secure integrations, audit trails, and deployment controls without disrupting the existing production system. I have 13+ years of experience and can work with Node.js/TypeScript, APIs, databases, authentication, RBAC/MFA, webhooks, cloud deployments, security, logging, backups, and production integrations. I will focus on server-authoritative business logic, idempotent webhook processing, strong validation, auditability, testing, and safe rollback strategies. For referral/commission systems, I would never trust client-supplied attribution or order status. Attribution would be validated and stored server-side, with immutable audit records, controlled ownership rules, idempotent processing, and commission calculations performed from verified backend data. I am comfortable working through named accounts, MFA, least-privilege access, company-controlled repositories, and documented handoff, while respecting the existing technical owner's architecture and approvals. I WILL PROVIDE 2 YEAR FREE ONGOING SUPPORT AND COMPLETE SOURCE CODE. WE WILL WORK WITH AGILE METHODOLOGY AND WILL GIVE YOU ASSISTANCE FROM ZERO TO PUBLISHING ON STORES. Thanks, Christina

@doomshellsl

Hello, Revenue-critical systems need more than working APIs—they need reliable state management, secure transactions, replay-safe webhooks, and clear recovery paths when something fails. We can step into your existing production environment and strengthen the backend systems that directly impact revenue and operations. Our Approach: • Audit CRM state, ownership logic, RBAC, and permissions • Review quoting, order integrity, payments, webhooks, and reconciliation • Validate referral/affiliate attribution and commission workflows • Strengthen APIs, idempotency, transactions, and failure recovery • Implement audit trails, logging, monitoring, and observability • Improve testing, deployment, rollback, security, and documentation First 3 areas we’d audit: Data integrity across CRM, quotes, orders, and payments Webhook/API reliability including retries, idempotency, and reconciliation Security & observability including RBAC, audit logs, and failure monitoring We have experience with Node.js, PHP, MySQL, REST APIs, authentication, payment integrations, backend workflows, and production-focused systems. We can take ownership of backend improvements end-to-end and work as a long-term technical partner. Let’s connect through Freelancer chat to review the current architecture and identify the highest-impact areas first.

@WebTechDesignBG

Hello, I confirm that I will work through named accounts, MFA, least privilege, company-controlled repositories, and documented handoff. It sounds like Nexara Labs is looking for a seasoned backend engineer who can build robust systems that ensure data integrity and maintain security without disrupting existing operations. With 7+ years of experience, I’ve tackled complex backend challenges, focusing on creating reliable infrastructure that supports revenue systems. I excel in Node/TypeScript and have a solid understanding of APIs, databases, and security practices. My approach is to assess risks behind feature requests and ensure that every piece of code aligns with best practices for reliability and security. For example, I can implement a server-authoritative system that doesn't trust client-side data, ensuring accurate attributions and preventing potential fraud. Could you share more about your current tech stack and any specific challenges you’ve faced with your existing systems? Best regards, Ivan Mandinski

@ozbas

Having been in the software engineering space for over a decade, I have proven myself capable of building robust backend systems from scratch - just like you're asking. Most recently, I developed a multi-solution mobile and web application using Node.js and Google Cloud APIs for a high-profile client. This project demanded tight security measures to protect sensitive user data and efficient authorization protocols. I delivered flawlessly on both aspects and can certainly bring the same level of dedication and proficiency into fortifying your system's revenue infrastructure. To keep your referral/commission system secured against client-supplied attribution or order state, I suggest a server-authoritative approach as opposed to trusting client-side inputs blindly. Utilizing designated server endpoints for all calculations involving commissions, attributions, or orders will effectively eliminate reliance on vulnerable client-side values. With strong authentication processes in place — like MFA and least privilege access - we would round out these security measures to ensure dependable operation. Lastly, concerning your other outlined requirements, I am familiar with named accounts, least privilege protocols, company-controlled repositories, and documented handoffs.

@webbookstudios

Hi there! I'm Markiyan, a full stack developer and CEO of a web agency, and I'm excited to help Nexara Labs USA build a robust revenue system. I understand that this project requires a seasoned backend engineer who can deliver reliable infrastructure without breaking the live business, focusing on key areas like CRM application, role-based access, and secure integrations. With 10+ years of experience in backend development, including Node/TypeScript, APIs, databases, and security, I'm confident in my ability to ship production-quality systems. My team and I have completed numerous projects, including a custom CRM system for a luxury leather retailer and a secure e-commerce platform for a Scandinavian fashion brand. I can deliver a well-structured, scalable, and secure backend system that meets Nexara Labs' requirements. One question: can you provide more details on the existing technical infrastructure and how the new revenue system will integrate with it? Feel free to message me to discuss the details! — Markiyan

@RedFeatherSol

Hi there, Could you share the current backend architecture and repository structure? Based on your project, we understand you want to strengthen the systems controlling customer ownership, CRM data, attribution, permissions, and revenue-related workflows. We’re a UK-based software development agency with senior backend engineers experienced in Node.js, TypeScript, APIs, databases, authentication, integrations, cloud infrastructure, and production systems. We’ll first map the existing data flows, trust boundaries, permissions, integrations, and production deployment process before changing business-critical code. Each workstream will have explicit acceptance tests, failure scenarios, logging requirements, and rollback plans before implementation. Changes will then move through controlled testing and review before being deployed into Nexara-controlled infrastructure. Questions: 1) Which business operations currently depend on client-submitted data? 2) What happens today when duplicate leads enter the CRM? Budget and timeline are flexible. Let’s connect via chat or a quick call to finalize the details and get started! Cheers, Darian.C From Red Feather Solutions

@technologiesit

As an accomplished Full Stack Developer and AI Solutions Expert with over 8 years of industry experience, I am well-versed in building performance-driven, scalable web and mobile applications, including secure backend systems. My expertise spans across multiple technologies including Node and TypeScript which are essential for this role. In fact, my strong technical acumen has empowered me to identify and mitigate potential risks to data integrity, payment and permissions - a skillset that aligns seamlessly with your requirements at Nexara Labs USA. One aspect I'd like to stress on, from my previous professional endeavors till now is my ability to understand the commercial logic behind your requested features without infringing on company accounts or creating any second source of truth. I value the importance of transparency in any crucial business process, hence ensuring a safe handoff of repositories, cloud domains and databases will be given utmost priority alongside comprehensive documentation for Nexara-controlled ownership. My long-standing commitment to clean code speaks volumes for itself; my contributions have always proven not merely reliable but effective enough to make me the trusted person for solving hard problems with production-quality systems.

@denisSolution

Hi, Looks like the main challenge here is building reliable systems for revenue-critical data—ownership, permissions, quotes, and commissions—while keeping everything auditable and secure in an existing product. I’ve worked on similar backend-heavy flows where the risk isn’t the feature itself but what happens when edges like duplicate data or unauthorized writes slip through. For handling CRM writes, permissions, and audit trails under load, I’d start by mapping the existing data model and replication paths, then layer in idempotency keys and strict schema validation before changing any live logic. The part that usually breaks first is when new writes conflict with existing records, so deduplication needs to be handled at the database level with constraints, not just in application code. I’ve built systems like this before where the key was keeping the server the source of truth for ownership and commissions, with client-side checks treated as a convenience rather than the source of record. The risk isn’t just technical; it’s making sure any changes can be rolled back cleanly if something unexpected surfaces. I’d prefer to start small, validate with tests, and expand only after the core paths are stable. Thanks, Denis