Open to new opportunities

Ajdin Lojić

Software Engineer · Backend & Full Stack · Ruby on Rails · React · TypeScript

Open to
Full-time · Part-time · Contract
Work
Remote · CET · Flexible for US hours
5+years building production web applications
200+B2B companies use Spiro, the CRM whose backend I build
7+third-party integrations across ERP, e-commerce and ad platforms

Profile

Software Engineer with 5+ years building B2B SaaS and third-party integrations. On the backend of Spiro, an AI-powered CRM used by 200+ manufacturers and distributors, I sync data from Epicor P21, NetSuite and Shopify with Ruby on Rails, PostgreSQL, Sidekiq and AWS. Previously integrated Meta, Google and Snapchat ad platforms, and started on the frontend with React and Next.js.

Experience

Software Engineer (Backend)

Jan 2026 – Present

Klika · Client: Spiro

  • Build backend services and product features for Spiro, an AI-powered CRM used by 200+ manufacturers and distributors, on Ruby on Rails and PostgreSQL
  • Build and maintain ERP and e-commerce integrations (Epicor P21, NetSuite, Shopify and more), pulling data from customers' SQL databases and syncing customers, orders and products into Spiro
  • Built internal tools that show integration status and data per customer company, plus automations for recurring integration and operations work
  • Run asynchronous workflows and scheduled syncs on Sidekiq, using sidekiq-cron and unique job processing to keep high-volume work reliable and idempotent
  • Contributed to communication features: Twilio calling and texting for Spiro's mobile app, and email account connections
  • Integrate AWS (S3, Lambda, ECS, KMS) for file storage, serverless processing and encryption of sensitive customer data, deployed on Heroku

Software Engineer (Full Stack)

Sep 2024 – Dec 2025

Klika · Client: WhatCampaign

  • Built an early-stage startup platform for media planning and launching ad campaigns across social networks from one place
  • Integrated advertising platform APIs (Meta for Facebook & Instagram, Google, Snapchat and more) for campaign creation and publishing
  • Developed it end to end: Ruby on Rails RESTful APIs, ActiveRecord domain models with complex business logic and a React/TypeScript frontend
  • Took the product from early development to a pilot with its first clients

Software Engineer (Frontend)

Feb 2024 – Aug 2024

Trinity · Client: Texttelligent

  • Built frontend features for Texttelligent's automotive product, mostly customer and service-department communication flows that let car dealerships text customers from one compliant inbox
  • Developed TypeScript + React/Next.js applications with a consistent Material UI component system, working closely with backend engineers on API contracts

Software Developer (Frontend)

Aug 2021 – Dec 2023

Experfy

  • Developed the frontend of Experfy's talent marketplace and hiring platform with React and Ember
  • Built responsive, cross-device interfaces and improved page speed and usability

Frontend Engineer (Freelance)

Mar 2024 – Dec 2025

Scanspire

  • Built the website for Scanspire, a penetration testing and security assessment company